2020-01-15 Oracle JDK Migration Guide

本指南的目的是帮助您确定潜在的问题，并就如何将现有的Java应用程序迁移到JDK 13发行版提供建议。 该指南还重点介绍了对JDK 13版本所做的重大更改和增强。原文地址

This guide contains the following sections:

Significant Changes in the JDK

Preparing For Migration

Migrating From JDK 8 to Later JDK Releases

Next Steps

Note:

Ensure that you check the Oracle JDK Certified System Configurations for the latest supported platforms, browsers, and operating system versions.

See Removed APIs, Tools, and Components before you start the migration process.

Significant Changes in the JDK

Before migrating your application to the latest JDK release, you must understand what the updates and changes are between it and the previous JDK release. If you are migrating from JDK 8, you should also be familiar with the differences between JDK 8 and later releases that are described in Migrating From JDK 8 to Later JDK Releases.

See the following sections to know some of the significant changes in latest JDK releases.

Significant Changes in JDK 13 Release

The following are some of the important enhancements in Java SE 13 and JDK 13:

Dynamic CDS Archiving extends application class-data sharing (ApsCDS), which allows dynamic archiving of classes when the Java application exits. See JEP 350: Dynamic CDS Archives.

Text blocks have been added to Java language, which provide developers with control over the format when desired. This is a preview language feature. See JEP 355 Text Blocks (Preview) and JEP 12: Preview Language and VM Features.

The switch expression, a preview language feature, has been extended to be used as either a statement or an expression, so that both forms can use either traditional labels (with fall through) or new labels (with no fall through). It is used with a further new statement for yielding a value from a switch expression. See JEP 354: Switch Expressions (Preview) and JEP 12: Preview Language and VM Features.

The implementation used by java.net.Socket andjava.net.ServerSocket APIs is replaced with a simpler and more modern implementation that is easy to maintain and debug. See JEP 353: Reimplement the Legacy Socket API.

Support for Unicode 12.1. See Unicode 12.1.

ZGC is enhanced to return unused heap memory to the operating system, which enhances the memory footprint of the applications. See JEP 351 ZGC Uncommit Unused Memory.

In addition, there are security related updates and a few removed tools and components that you need to be aware of. See:

       Security Updates

       Removed APIs, Tools, and Components

Significant Changes in JDK 12 Release

The following are some of the important additions and updates in Java SE 12 and JDK 12:

JVM Constants API is introduced to model nominal descriptions of key class-file and run-time artifacts, in particular constants that are loadable from the constant pool. See JVM Constant API.

The switch statement is extended so that it can be used either as a statement or an expression. This is a preview language feature. See JEP 325: Switch Expressions (Preview) and JEP 12: Preview Language and VM Features.

Support for Unicode 11.0. See Unicode 11.0.

Square character support is provided for the Japanese Reiwa Era, which began on May, 2019. See Square character support.

The NumberFormat adds support for formatting a number in its compact form. See Compact Number Formatting Support .

Significant Changes in JDK 11 Release

JDK 11 had some significant changes too. As JDK 11 is a long term support (LTS) release, you should be familiar with the following important changes in JDK 11 release:

Oracle no longer offers JRE and Server JRE downloads; consequently, Auto-Update is not available anymore.

Java Web Start, Java Plugin, and Java Control Panel are not available in JDK. See Removal of the Deployment Stack.

JavaFX is no longer included in the JDK. It is now available as a separate download from https://openjfx.io/.

JAXB and JAX-WS are no longer bundled with JDK. See Removal of Java EE and CORBA Modules.

Removal of the Deployment Stack

Java deployment technologies were deprecated in JDK 9 and removed in JDK 11.

Java applet and Web Start functionality, including the Java plug-in, the Java Applet Viewer, Java Control Panel, and Java Web Start, along with javawstool, have been removed in JDK 11.

See Remove Java Deployment Technologies.

Removal of Java EE and CORBA Modules

In JDK 11, the Java EE and CORBA modules were removed. These modules were deprecated for removal in JDK 9.

The removed modules are:

java.xml.ws: Java API for XML Web Services (JAX-WS), Web Services Metadata for the Java Platform, and SOAP with Attachments for Java (SAAJ)

java.xml.bind: Java Architecture for XML Binding (JAXB)

java.xml.ws.annotation: The subset of the JSR-250 Common Annotations defined by Java SE to support web services

java.corba: CORBA

java.transaction: The subset of the Java Transaction API defined by Java SE to support CORBA Object Transaction Services

java.activation: JavaBeans Activation Framework

java.se.ee: Aggregator module for the six modules above

jdk.xml.ws: Tools for JAX-WS

jdk.xml.bind: Tools for JAXB

Existing code with references to classes in these APIs will not compile without changes to the build. Similarly, code on the class path with references to classes in these APIs will fail with NoDefClassFoundError or ClassNotFoundException unless changes are made in how the application is deployed.

See JEP 320: Remove the Java EE and CORBA Modules to get more information about possible replacements for the modules.

Note:

You can download JAXB and JAX-WS from Maven.

Security Updates

This section provides details on the security updates done in JDK releases.

Security Updates in JDK 13

The following have been removed from JDK 13:

Experimental FIPS 140 compliant mode from SunJSSE provider

Duplicated RSA services no longer supported by SunJSSE provider

Removal of Security Cerificates

The following root certificates have been removed from keystore in JDK 13:

T-Systems Deutsche Telekom Root CA 2 certificate

Two DocuSign Root CA certificates

Two Comodo Root CA certificates

Security Updates in JDK 12 and JDK 11

The JDK 11 release includes an implementation of the Transport Layer Security (TLS) 1.3 specification (RFC 8446).

TLS 1.3 is the latest iteration (August 2018) of the Transport Layer Security (TLS) protocol and is enabled by default in JDK 11. This version focuses not only on speed improvements, but also updates the overall security of the protocol by emphasizing modern cryptography practices, and disallows outdated or weak crypto algorithms. (For example, RSA key exchange and plain DSA signatures are no longer allowed.)

Several features were added to the TLS 1.3 protocol to improve backwards compatibility, but there are several issues of which you need to be aware of. For details, see JEP 332.

Removal of Security Certificates

The following root certificate has been removed from the keystore in JDK 12:

Removal of GTE CyberTrust Global Root

The following root certificates have been removed from the truststore in JDK 11:

Several Symantec Root CAs

Baltimore Cybertrust Code Signing CA

SECOM Root Certificate

AOL and Swisscom root certificates

Products that use certificates that have been removed may no longer work. If these certificates are required, then you must configure and populate the cacerts with the missing certs. To add certs to the truststore, see keytool in Java Development Kit Tool Specifications guide.

Removed APIs, Tools, and Components

This section provides details about Java SE APIs, tools, and components that were removed in JDK 13, JDK 12, and JDK 11 releases.

Run jdeprscan --release 13 -l --for-removal to get the list of APIs that are marked for removal in JDK 13.

Note:

The jdeprscan tool is available since JDK 9. If you want to print the list of APIs for a different JDK version, then replace the release number with 9 or later.

Removed APIs in Java SE 13

The following APIs were removed in Java SE 13. Both of these APIs were deprecated and marked for removal with JDK 9. Both have been superseded by JVM-specific tracing mechanisms. See JVMTM Tool Interfacespecification.

java.lang.Runtime.traceInstructions(boolean)     

java.lang.Runtime.traceMethodCalls(boolean)

APIs Removed in Java SE 12

The following APIs were removed in Java SE 12.

            java.io.FileInputStream.finalize()     

            java.io.FileOutputStream.finalize()     

            java.util.zip.Deflater.finalize()     

            java.util.zip.Inflater.finalize()     

            java.util.zip.ZipFile.finalize()     

Removed APIs in JDK 11

The following APIs were removed in JDK 11. Many of these APIs were deprecated in previous releases and have been replaced by newer APIs.

javax.security.auth.Policy

java.lang.Runtime.runFinalizersOnExit(boolean)

java.lang.SecurityManager.checkAwtEventQueueAccess()

java.lang.SecurityManager.checkMemberAccess(java.lang.Class,int)

java.lang.SecurityManager.checkSystemClipboardAccess()

java.lang.SecurityManager.checkTopLevelWindow(java.lang.Object)

java.lang.System.runFinalizersOnExit(boolean)

java.lang.Thread.destroy()

java.lang.Thread.stop(java.lang.Throwable)

Tools and Components No Longer Shipped with JDK as of JDK 11

The following section lists tools and components that are experimental, obsolete, or no longer used and have been removed from the JDK as of JDK 11.

Main Tools

appletviewer

See JDK-8200146 : Remove the appletviewer launcher.

CORBA Tools

idlj

orbd

servertool

tnamesrv

In addition, the rmic (the RMI compiler) will no longer support the -idl or -iiop options. See JDK 11 Release Notes.

Java Web Services Tools

schemagen

wsgen

wsimport

xjc

See JEP 320: Remove the Java EE and CORBA Modules.

Java Deployment Tools

javapackager

javaws

Note:

The pack200 and unpack200 have beendeprecated and might be removed in a future JDK release.

See Removal of JavaFX from JDK and JEP 336: Deprecate the Pack200 Tools and API.

Monitoring Tools

jmc: In JDK 11, JMC is available as a standalone package and not bundled in the JDK.

See Removal of JMC from JDK and Java Mission Control.

JVM-MANAGEMENT-MIB.mib

The specification for JVM monitoring and management through SNMP JVM-MANAGEMENT-MIB.mib has been removed. See Removal of JVM-MANAGEMENT-MIB.mib.

SNMP Agent

The jdk.snmp module has been removed. See Removal of SNMP Agent.

Oracle Desktop Specific Removals

Oracle JDK T2K font rasterizer has been removed.

Lucida Fonts: Oracle JDK no longer ships any fonts and relies entirely on fonts installed on the operating system. See Removal of Lucida Fonts from Oracle JDK.

Preparing For Migration

The following sections will help you successfully migrate your application:

Download the Latest JDK

Run Your Program Before Recompiling

Update Third-Party Libraries

Compile Your Application if Needed

Run jdeps on Your Code

Download the Latest JDK

Download and install the latest JDK release.

Run Your Program Before Recompiling

Try running your application on the latest JDK release (JDK 13). Most code and libraries should work on JDK 13 without any changes, but there may be some libraries that need to be upgraded.

Note:

Migrating is an iterative process. You’ll probably find it best to try running your program (this task) first, then complete these three tasks more or less in parallel:

Update Third-Party Libraries

Compile Your Application if Needed

Run jdeps on Your Code

When you run your application, look for warnings from the JVM about obsolete VM options. If the VM fails to start, then look for Removed GC Options.

If your application starts successfully, look carefully at your tests and ensure that the behavior is the same as on the JDK version you have been using. For example, a few early adopters have noticed that their dates and currencies are formatted differently. See Use CLDR Locale Data by Default.

To make your code work on the latest JDK release, understand the new features and changes in each of the JDK release.

For detailed information about the new features and changes in JDK 13, see What's New in JDK 13 - New Features and Enhancements.

For detailed information about the new features and changes in JDK 12, see What's New in JDK 12 - New Features and Enhancements.

For detailed information about the new features and changes in JDK 11, see What’s New in JDK 11 — New Features and Enhancements.

For detailed information about the new features and changes in JDK 10, see What’s New in JDK 10.

For a comprehensive list of all of the new features of JDK 9, see What's New in JDK 9.

For detailed information about the changes in JDK 9, see JDK 9 Release Notes.

Even if your program appears to run successfully, you should complete the rest of the steps in this guide and review the list of issues.

Update Third-Party Libraries

For every tool and third-party library that you use, you may need to have an updated version that supports the latest JDK release.

Check the websites for your third-party libraries and your tool vendors for a version of each library or tool that’s designed to work on the latest JDK. If one exists, then download and install the new version.

If you use Maven or Gradle to build your application, then make sure to upgrade to a recent version that supports the latest JDK version.

If you use an IDE to develop your applications, then it might help in migrating the existing code. The NetBeans, Eclipse, and IntelliJ IDEs all have versions available that include support for the latest JDK.

You can see the status of the testing of many Free Open Source Software (FOSS)  projects with OpenJDK builds at Quality Outreach on the OpenJDK wiki.

Compile Your Application if Needed

Compiling your code with the latest JDK compiler will ease migration to future releases since the code may depend on APIs and features, which have been identified as problematic. However, it is not strictly necessary.

If you need to compile your code with JDK 11 and later compilers, then take note of the following:

If you use the underscore character ("_") as a one-character identifier in source code, then your code won’t compile in JDK 11 and later releases. It generates a warning in JDK 8, and an error, starting from JDK 9.

As an example:

static Object _ = new Object();

This code generates the following error message from the compiler:

MyClass.java:2: error: as of release 9, '_' is a keyword, and may not be used as a legal identifier.

If you use the -source and -target options with javac, then check the values that you use.

The supported -source/-target values are 12 (the default), 11, 10, 9, 8, 7, and 6 (6 is deprecated, and a warning is displayed when this value is used).

In JDK 8, -source and -target values of 1.5/5 and earlier were deprecated, and caused a warning. In JDK 9 and above, those values cause an error.

>javac -source 5 -target 5 Sample.java warning: [options] bootstrap class path not set in conjunction with -source 5 error: Source option 5 is no longer supported. Use 6 or later. error: Target option 1.5 is no longer supported. Use 1.6 or later.

If possible, use the new --release flag instead of the -source and -target options. See javac in Java Development Kit Tool Specifications.

The valid arguments for the --release flag follow the same policy as for -source and -target, one plus three back.

The javac can recognize and process class files of all previous JDKs, going all the way back to JDK 1.0.2 class files.

See JEP 182: Policy for Retiring javac -source and -target Options.

Critical internal JDK APIs such as sun.misc.Unsafe are still accessible in JDK 11 and later, but most of the JDK’s internal APIs are not accessible at compile time. You may get compilation errors that indicate that your application or its libraries are dependent on internal APIs.

To identify the dependencies, run the Java Dependency Analysis tool. See Run jdeps on Your Code. If possible, update your code to use the supported replacement APIs.

You may use the --add-exports option as a temporary workaround to compile source code with references to JDK internal classes.

You may see more deprecation warnings than previously.

Run jdeps on Your Code

Run the jdeps tool on your application to see what packages and classes your applications and libraries depend on. If you use internal APIs, then jdeps may suggest replacements to help you to update your code.

To look for dependencies on internal JDK APIs, run jdeps with the -jdkinternals option. For example, if you run jdeps on a class that calls sun.misc.BASE64Encoder, you’ll see:

>jdeps -jdkinternals Sample.class

Sample.class -> JDK removed internal API  Sample  -> sun.misc.BASE64Encoder  JDK internal API (JDK removed internal API)

Warning: JDK internal APIs are unsupported and private to JDK implementation that aresubject to be removed or changed incompatibly and could break your application.Please modify your code to eliminate dependency on any JDK internal APIs.For the most recent update on JDK internal API replacements, please check:https://wiki.openjdk.java.net/display/JDK8/Java+Dependency+Analysis+Tool

JDK Internal API                        Suggested Replacement

------------------------------                               -------------------------------

sun.misc.BASE64Encoder                  Use java.util.Base64 @since 1.8

If you use Maven, there’s a jdeps plugin available.

For jdeps syntax, see jdeps in the Java Development Kit Tool Specifications.

Keep in mind that jdeps is a static analysis tool, and static analysis of code might not provide a complete list of dependencies. If the code uses reflection to call an internal API, then jdeps doesn’t warn you.

Migrating From JDK 8 to Later JDK Releases

There were significant changes made between the JDK 8 and later JDK releases.

Every new Java SE release introduces some binary, source, and behavioral incompatibilities with previous releases. The modularization of the Java SE Platform that happened in JDK 9 brought many benefits, but also many changes. Code that uses only official Java SE Platform APIs and supported JDK-specific APIs should continue to work without change. Code that uses JDK-internal APIs should continue to run but should be migrated to use the supported APIs.

The following sections describe the changes in the JDK package and APIs that you should be aware of when migrating your JDK 8 applications to later JDK releases.

Look at the list of changes that you may encounter as you run your application.

New Version-String Scheme

Understanding Runtime Access Warnings

Changes to the Installed JDK/JRE Image

Removed or Changed APIs

Deployment

Security Updates in JDK 9

Changes to Garbage Collection

Removed Tools and Components

Removed macOS-Specific Features

When your application is running successfully on the latest version of JDK, review Next Steps, which will help you avoid problems with future releases.

Understanding Runtime Access Warnings

Some tools and libraries use reflection to access parts of the JDK that are meant for internal use only. This illegal reflective access will be disabled in a future release of the JDK. Currently, it is permitted by default and a warning is issued.

For example, here is the warning issued when starting Jython:

>java -jar jython-standalone-2.7.0.jarWARNING: An illegal reflective access operation has occurredWARNING: Illegal reflective access by jnr.posix.JavaLibCHelper (file:/C:/Jython/jython2.7.0/jython-standalone-2.7.0.jar) to method sun.nio.ch.SelChImpl.getFD()WARNING: Please consider reporting this to the maintainers of jnr.posix.JavaLibCHelperWARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operationsWARNING: All illegal access operations will be denied in a future releaseJython 2.7.0 (default:9987c746f838, Apr 29 2015, 02:25:11)

If you see a warning like this, contact the maintainers of the tool or library. The second line of the warning names the exact JAR file whose code used reflection to access an internal part of the JDK.

By default, a maximum of one warning about reflective access is issued in the lifetime of the process started by the java launcher. The exact timing of the warning depends on the behavior of tools and libraries performing reflective–access operations. The warning may appear early in the lifetime of the process, or a long time after startup.

You can disable the warning message on a library-by-library basis by using the --add-opens command line flag. For example, you can start Jython in the following way:

>java --add-opens java.base/sun.nio.ch=ALL-UNNAMED --add-opens java.base/java.io=ALL-UNNAMED -jar jython-standalone-2.7.0.jarJython 2.7.0 (default:9987c746f838, Apr 29 2015, 02:25:11)

This time, the warning is not issued because the java invocation explicitly acknowledges the reflective access. As you can see, you may need to specify multiple --add-opens flags to cover all of the reflective access operations that are attempted by libraries on the class path.

To better understand the behavior of tools and libraries, you can use the --illegal-access=warn command line flag. This flag causes a warning message to be issued for every illegal reflective-access operation. In addition, you can obtain detailed information about illegal reflective-access operations, including stack traces, by setting --illegal-access=debug.

If you have updated libraries, or when you get them, then you can experiment with using the --illegal-access=deny command line flag. It disables all reflective-access operations except for those enabled by other command-line options, such as --add-opens. This will be the default mode in a future release.

There are two options that allow you to break encapsulation in specific ways. You could use these in combination with --illegal-access=deny, or, as already mentioned, to suppress warnings.

If you need to use an internal API that has been made inaccessible, then use the --add-exports runtime option. You can also use --add-exports at compile time to access internal APIs.

If you have to allow code on the class path to do deep reflection to access nonpublic members, then use the --add-opens option.

If you want to suppress all reflective access warnings, then use the --add-exports and --add-opens options where needed.

--add-exports

If you must use an internal API that has been made inaccessible by default, then you can break encapsulation using the --add-exports command-line option.

The syntax of the --add-exports option is:

--add-exports /=(,)*

where  and  are module names and  is the name of a package.

The --add-exports option allows code in the target module to access types in the named package of the source module if the target module reads the source module.

As a special case, if the  is ALL-UNNAMED, then the source package is exported to all unnamed modules, whether they exist initially or are created later on. For example:

--add-exports java.management/sun.management=ALL-UNNAMED

This example allows code in all unnamed modules (code on the class path) to access the public members of public types in java.management/sun.management. If the code on the class path attempts to do deep reflection to access nonpublic members, then the code fails.

If an application oldApp that runs on the classpath must use the unexported com.sun.jmx.remote.internal package of the java.management module, then the access that it requires can be granted in this way:

--add-exports java.management/com.sun.jmx.remote.internal=ALL-UNNAMED

You can also break encapsulation with the JAR file manifest:

Add-Exports:java.management/sun.management

Use the --add-exports option carefully. You can use it to gain access to an internal API of a library module, or even of the JDK itself, but you do so at your own risk. If that internal API changes or is removed, then your library or application fails.

See also JEP 261.

--add-opens

If you have to allow code on the class path to do deep reflection to access nonpublic members, then use the --add-opens runtime option.

Some libraries do deep reflection, meaning setAccessible(true), so they can access all members, including private ones. You can grant this access using the --add-opens option on the java command line. No warning messages are generated as a result of using this option.

If --illegal-access=deny, and you see IllegalAccessException or InaccessibleObjectException messages at runtime, you could use the --add-opens runtime option, basing the arguments upon the information shown in the exception message.

The syntax for --add-opens is:

--add-opens module/package=target-module(,target-module)*

This option allows  to open  to , regardless of the module declaration.

As a special case, if the  is ALL-UNNAMED, then the source package is exported to all unnamed modules, whether they exist initially or are created later on. For example:

--add-opens java.management/sun.management=ALL-UNNAMED

This example allows all of the code on the class path to access nonpublic members of public types in the java.management/sun.managementpackage.

Note:

If you are using the JNI Invocation API, including, for example, a Java Web Start JNLP file, you must include an equals sign between --add-opens and its value.

The equals sign between --add-opens and its value is optional on the command line.

New Version-String Scheme

JDK 10 introduced some minor changes, to better accommodate the time-based release model, to the version-string scheme introduced in JDK 9. JDK 11 and later retains the version string format that was introduced in JDK 10.

If your code relies on the version-string format to distinguish major, minor, security, and patch update releases, then you may need to update it.

The format of the new version-string is:

$FEATURE.$INTERIM.$UPDATE.$PATCH

A simple Java API to parse, validate, and compare version strings has been added. See java.lang.Runtime.Version.

See Version String Format in Java Platform, Standard Edition Installation Guide .

For the changes to the version string introduced in JDK 9, seeJEP 223: New Version-String Scheme .

For the version string changes introduced in JDK 10, see JEP 322: Time-Based Release Versioning.

Changes to the Installed JDK/JRE Image

Significant changes have been made to the JDK and JRE.

Changed JDK and JRE Layout

After you install the JDK, if you look at the file system, you’ll notice that the directory layout is different from that of releases before JDK 9.

JDK 11 and Later

JDK 11 and later does not have the JRE image. See Installed Directory Structure of JDK in Java Platform, Standard Edition Installation Guide.

JDK 9 and JDK 10

Prior releases had two types of runtime images: the JRE, which was a complete implementation of the Java SE Platform, and the JDK, which included the entire JRE in a jre/ directory, plus development tools and libraries.

In JDK 9 and and JDK 10, the JDK and JRE are two types of modular runtime images containing the following directories:

bin: contains binary executables.

conf: contains .properties, .policy, and other kinds of files intended to be edited by developers, deployers, and end users. These files were formerly found in the lib directory or its subdirectories.

lib: contains dynamically linked libraries and the complete internal implementation of the JDK.

In JDK 9 and JDK 10, there are still separate JDK and JRE downloads, but each has the same directory structure. The JDK image contains the extra tools and libraries that have historically been found in the JDK. There are no jdk/ versus jre/ wrapper directories, and binaries (such as the javacommand) aren’t duplicated.

See JEP 220: Modular Run-Time Images.

New Class Loader Implementations

JDK 9 and later releases maintain the hierarchy of class loaders that existed since the 1.2 release. However, the following changes have been made to implement the module system:

The application class loader is no longer an instance of URLClassLoader but, rather, of an internal class. It is the default loader for classes in modules that are neither Java SE nor JDK modules.

The extension class loader has been renamed; it is now the platform class loader. All classes in the Java SE Platform are guaranteed to be visible through the platform class loader.

Just because a class is visible through the platform class loader does not mean the class is actually defined by the platform class loader. Some classes in the Java SE Platform are defined by the platform class loader while others are defined by the bootstrap class loader. Applications should not depend on which class loader defines which platform class.

The changes that were implemented in JDK 9 may impact code that creates class loaders with null (that is, the bootstrap class loader) as the parent class loader and assumes that all platform classes are visible to the parent. Such code may need to be changed to use the platform class loader as the parent (see ClassLoader.getPlatformClassLoader).

The platform class loader is not an instance of URLClassLoader, but, rather, of an internal class.

The bootstrap class loader is still built-in to the Java Virtual Machine and represented by null in the ClassLoader API. It defines the classes in a handful of critical modules, such as java.base. As a result, it defines far fewer classes than in JDK 8, so applications that are deployed with -Xbootclasspath/a or that create class loaders with null as the parent may need to change as described previously.

Removed rt.jar and tools.jar in JDK 9

Class and resource files previously stored in lib/rt.jar, lib/tools.jar, lib/dt.jar and various other internal JAR files are stored in a more efficient format in implementation-specific files in the lib directory.

The removal of rt.jar and similar files leads to issues in these areas:

Starting from JDK 9, ClassLoader.getSystemResource doesn’t return a URL pointing to a JAR file (because there are no JAR files). Instead, it returns a jrt URL, which names the modules, classes, and resources stored in a runtime image without revealing the internal structure or format of the image.

For example:

ClassLoader.getSystemResource("java/lang/Class.class");

When run on JDK 8, this method returns a JAR URL of the form:

jar:file:/usr/local/jdk8/jre/lib/rt.jar!/java/lang/Class.class

which embeds a file URL to name the actual JAR file within the runtime image.

A modular image doesn’t contain any JAR files, so URLs of this form make no sense. On JDK 9 and later releases, this method returns:

jrt:/java.base/java/lang/Class.class

The java.security.CodeSource API and security policy files use URLs to name the locations of code bases that are to be granted specific permissions. See Policy File Syntax in Java Platform, Standard Edition Security Developer's Guide. Components of the runtime system that require specific permissions are currently identified in the conf/security/java.policy file by using file URLs.

Older versions of IDEs and other development tools require the ability to enumerate the class and resource files stored in a runtime image, and to read their contents directly by opening and reading rt.jar and similar files. This isn’t possible with a modular image.

Removed Extension Mechanism in JDK 9

In JDK 8 and earlier, the extension mechanism made it possible for the runtime environment to find and load extension classes without specifically naming them on the class path. Starting from JDK 9, if you need to use the extension classes, ensure that the JAR files are on the class path.

In JDK 9 and JDK 10, the javac compiler and java launcher will exit if the java.ext.dirs system property is set, or if the lib/ext directory exists. To additionally check the platform-specific systemwide directory, specify the -XX:+CheckEndorsedAndExtDirs command-line option. This causes the same exit behavior to occur if the directory exists and isn’t empty. The extension class loader is retained in JDK 9 (and later releases) and is specified as the platform class loader (see getPlatformClassLoader.) However, in JDK 11, this option is obsolete and a warning is issued when it is used.

The following error means that your system is configured to use the extension mechanism:

/lib/ext exists, extensions mechanism no longer supported; Use -classpath instead..Error: Could not create the Java Virtual Machine.Error: A fatal exception has occurred. Program will exit.

You’ll see a similar error if the java.ext.dirs system property is set.

To fix this error, remove the ext/ directory or the java.ext.dirs system property.

See JEP 220: Modular Run-Time Images.

Removed Endorsed Standards Override Mechanism

The java.endorsed.dirs system property and the lib/endorseddirectory are no longer present. The javac compiler and java launcher will exit if either one is detected.

Starting from JDK 9, you can use upgradeable modules or put the JAR files on the class path.

This mechanism was intended for application servers to override components used in the JDK. Packages to be updated would be placed into JAR files, and the system property java.endorsed.dirs would tell the Java runtime environment where to find them. If a value for this property wasn’t specified, then the default of $JAVA_HOME/lib/endorsed was used.

In JDK 8, you can use the -XX:+CheckEndorsedAndExtDirs command-line argument to check for such directories anywhere on the system.

In JDK 9 and later releases, the javac compiler and java launcher will exit if the java.endorsed.dirs system property is set, or if the lib/endorsed directory exists.

The following error means that your system is configured to use the endorsed standards override mechanism:

/lib/endorsed is not supported. Endorsed standards and standalone APIsin modular form will be supported via the concept of upgradeable modules.Error: Could not create the Java Virtual Machine.Error: A fatal exception has occurred. Program will exit.

You’ll see a similar error if the java.endorsed.dirs system property is set.

To fix this error, remove the lib/endorsed directory, or unset the java.endorsed.dirs system property.

See JEP 220: Modular Run-Time Images.

Windows Registry Key Changes

The Java 11 installer creates these Windows registry keys when installing the JDK:

“HKEY_LOCAL_MACHINE\SOFTWARE\JavaSoft\JDK”

“HKEY_LOCAL_MACHINE\SOFTWARE\JavaSoft\JDK\11”

If there are two versions of JDK installed, then there will be two different Windows registry keys are created. For example, if JDK 11.0.1 is installed with JDK 11, then the installer creates the another Windows registry key as shown:

“HKEY_LOCAL_MACHINE\SOFTWARE\JavaSoft\JDK”

“HKEY_LOCAL_MACHINE\SOFTWARE\JavaSoft\JDK\11.0.1”

Removed or Changed APIs

This section highlights APIs that have been made inaccessible, removed, or altered in their default behavior. You may encounter the issues described in this section when compiling or running your application.

See APIs Removed in Java SE 12 and Removed APIs in JDK 11.

Removed APIs in JDK 9 and JDK 10

The following are some important APIs that have been removed from JDK 9 and JDK 10 releases.

Removed java.* APIs

The Java team is committed to backward compatibility. If an application runs in JDK 8, then it will run on JDK 9 and later releases as long as it uses APIs that are supported and intended for external use.

These include:

JCP standard, java.*, javax.*

JDK-specific APIs, some com.sun.*, some jdk.*

Supported APIs can be removed from the JDK, but only with notice. Find out if your code is using deprecated APIs by running the static analysis tool jdeprscan.

java.* APIs that were removed in JDK 9 include the previously deprecated methods from the java.util.logging.LogManager and java.util.jar.Pack200 packages:

java.util.logging.LogManager.addPropertyChangeListener

java.util.logging.LogManager.removePropertyChangeListener

java.util.jar.Pack200.Packer.addPropertyChangeListener

java.util.jar.Pack200.Packer.removePropertyChangeListener

java.util.jar.Pack200.Unpacker.addPropertyChangeListener

java.util.jar.Pack200.Unpacker.removePropertyChangeListener

Removal and Future Removal of sun.misc and sun.reflect APIs

Unlike the java.* APIs, almost all of the sun.* APIs are unsupported, JDK-internal APIs, and may go away at any time.

A few sun.* APIs were removed in JDK 9. Notably, sun.misc.BASE64Encoder and sun.misc.BASE64Decoder were removed. Instead, use the supported java.util.Base64 class, which was added in JDK 8.

If you use these APIs, you may wish to migrate to their supported replacements:

sun.misc.Unsafe

The functionality of many of the methods in this class is available by using variable handles, see JEP 193: Variable Handles.

sun.reflect.Reflection::getCallerClass(int)

Instead, use the stack-walking API, see JEP 259: Stack-Walking API.

See JEP 260: Encapsulate Most Internal APIs.

java.awt.peer Not Accessible

The java.awt.peer and java.awt.dnd.peer packages aren’t accessible, starting in JDK 9. The packages were never part of the Java SE API, despite being in the java.* namespace.

All methods in the Java SE API that refer to types defined in these packages were removed from JDK 9. Code that calls a method that previously accepted or returned a type defined in these packages no longer compiles or runs.

There are two common uses of the java.awt.peer classes. You should replace them as follows:

To see if a peer has been set yet:

if (component.getPeer() != null) { .. }

Replace this with Component.isDisplayable() from the JDK 1.1 API:

public boolean isDisplayable() {

return getPeer() != null;

To test if a component is lightweight:

if (component.getPeer() instanceof LightweightPeer) ..

Replace this with Component.isLightweight() from the JDK 1.2 API:

public boolean isLightweight() {

return getPeer() instanceof LightweightPeer;

Removed com.sun.image.codec.jpeg Package

The nonstandard package com.sun.image.codec.jpeg has been removed. Use the Java Image I/O API instead.

The com.sun.image.codec.jpeg package was added in JDK 1.2 as a nonstandard way of controlling the loading and saving of JPEG format image files. It has never been part of the platform specification.

In JDK 1.4, the Java Image I/O API was added as a standard API, residing in the javax.imageio package. It provides a standard mechanism for controlling the loading and saving of sampled image formats and requires all compliant Java SE implementations to support JPEG based on the Java Image I/O specification.

Removed Tools Support for Compact Profiles

Starting in JDK 9, you can choose to build and run your application against any subset of the modules in the Java runtime image, without needing to rely on predefined profiles.

Profiles, introduced in Java SE 8, define subsets of the Java SE Platform API that can reduce the static size of the Java runtime on devices that have limited storage capacity. The tools in JDK 8 support three profiles, compact1, compact2, and compact3. For the API composition of each profile, see Detailed Profile Composition and API Reference in the JDK 8 documentation.

In JDK 8, you use the -profile option to specify the profile when running the javac and java commands. Starting in JDK 9, the -profile option is supported by javac only in conjunction with the --release 8 option, and isn’t supported by java.

JDK 9 and later releases let you choose the modules that are used at compile and run time. By specifying modules with the new --limit-modulesoption, you can obtain the same APIs that are in the compact profiles. This option is supported by both the javac and java commands, as shown in the following examples:

javac --limit-modules java.base,java.logging MyApp.java

java --limit-modules java.base,java.logging MyApp

The packages specified for each profile in Java SE 8 are exported, collectively, by the following sets of modules:

For the compact1 profile: java.base, java.logging, java.scripting

For the compact2 profile: java.base, java.logging,java.scripting, java.rmi, java.sql, java.xml

For the compact3 profile: java.base, java.logging,

 java.scripting, java.rmi, java.sql, java.xml, java.compiler, java.instrument, java.management,java.naming, java.prefs, java.security.jgss,java.security.sasl, java.sql.rowset, java.xml.crypto

You can use the jdeps tool to do a static analysis of the Java packages that are being used in your source code. This gives you the set of modules that you need to execute your application. If you had been using the compact3profile, for example, then you may see that you don’t need to include that entire set of modules when you build your application. See jdeps in Java Development Kit Tool Specifications.

See JEP 200: The Modular JDK.

Use CLDR Locale Data by Default

Starting in JDK 9, the Unicode Consortium's Common Locale Data Repository (CLDR) data is enabled as the default locale data, so that you can use standard locale data without any further action.

In JDK 8, although CLDR locale data is bundled with the JRE, it isn’t enabled by default.

Code that uses locale-sensitive services such as date, time, and number formatting may produce different results with the CLDR locale data. Remember that even System.out.printf() is locale-aware.

To enable behavior compatible with JDK 8, set the system property java.locale.providers to a value with COMPAT ahead of CLDR, for example, java.locale.providers=COMPAT,CLDR.

See CLDR Locale Data Enabled by Default in the Java Platform, Standard Edition Internationalization Guide and JEP 252: Use CLDR Locale Data by Default.

Deprecated Nashorn JavaScript Script Engine and APIs

The Nashorn engine, the jjs tool, and the modules jdk.scripting.nashorn and jdk.scripting.nashorn.shell have been deprecated in JDK 11 in preparation for removal in a future release.

You'll receive a warning message if you run an application that uses the Nashorn engine or the jjs tool. If your scripts or tools are not expecting these warning messages, then you can suppress them.

When you run an application that uses the Nashorn Java API, you will receive the warning, "Warning: Nashorn engine is planned to be removed from a future JDK release." To suppress this warning, specify the --no-deprecation-warning option in the nashorn.args system property. For example, suppose that EvalScript is an application that uses the Nashorn Java API. Run this application as follows to suppress the warning:

java -Dnashorn.args="--no-deprecation-warning" EvalScript

Similarly when you run the jjs tool, you will receive the warning, "Warning: The jjs tool is planned to be removed from a future JDK release." To suppress this warning, specify the --no-deprecation-warning option.

Deployment

Java deployment technologies were deprecated in JDK 9 and removed in JDK 11.

Use the jlink tool introduced with JDK 9 to package and deploy dedicated runtimes rather than relying on a pre-installed system JRE.

Removed Launch-Time JRE Version Selection

The ability to request a version of the JRE that isn’t the JRE being launched at launch time is removed, starting in JDK 9.

Modern applications are typically deployed using Java Web Start (JNLP), native OS packaging systems, or active installers. These technologies have their own methods to manage the JREs needed, by finding or downloading and updating the required JRE, as needed. This makes the launcher's launch-time JRE version selection obsolete.

In the previous releases, you could specify what JRE version (or range of versions) to use when starting an application. Version selection was possible through both a command-line option and manifest entry in the application's JAR file.

Starting in JDK 9, the java launcher is modified as follows:

Emits an error message and exits if the -version: option is given on the command line.

Emits a warning message and continues if the JRE-Version manifest entry is found in a JAR file.

See JEP 231: Remove Launch-Time JRE Version Selection.

Removed Support for Serialized Applets

Starting in JDK 9, the ability to deploy an applet as a serialized object isn’t supported. With modern compression and JVM performance, there’s no benefit to deploying an applet in this way.

The object attribute of the applet tag and the object and java objectapplet parameter tags are ignored when starting applet.

Instead of serializing applets, use standard deployment strategies.

JNLP Specification Update

JNLP (Java Network Launch Protocol) has been updated to remove inconsistencies, make code maintenance easier, and enhance security.

JNLP has been updated as follows:

1. & instead of & in JNLP files.

The JNLP file syntax conforms to the XML specification and all JNLP files should be able to be parsed by standard XML parsers.

JNLP files let you specify complex comparisons. Previously, this was done by using the ampersand (&), but this isn’t supported in standard XML. If you’re using & to create complex comparisons, then replace it with & in your JNLP file. & is compatible with all versions of JNLP.

2. Comparing numeric version element types against nonnumeric version element types.

Previously, when an int version element was compared with another version element that couldn’t be parsed as an int, the version elements were compared lexicographically by ASCII value.

Starting in JDK 9, if the element that can be parsed as an int is a shorter string than the other element, it will be padded with leading zeros before being compared lexicographically by ASCII value. This ensures there can be no circularity.

In the case where both version comparisons and a JNLP servlet are used, you should use only numeric values to represent versions.

3. Component extensions with nested resources in java (or j2se) elements.

This is permitted in the specification. It was previously supported, but this support wasn’t reflected in the specification.

4. FX XML extension.

The JNLP specification has been enhanced to add a type attribute to application-desc element, and add the subelement param in application-desc (as it already is in applet-desc).

This doesn’t cause problems with existing applications because the previous way of specifying a JavaFX application is still supported.

See the JNLP specification updates at JSR-056.

Security Updates in JDK 9

Some security-related defaults have changed, starting from JDK 9.

JCE Jurisdiction Policy File Default is Unlimited

If your application previously required the Java Cryptography Extension (JCE) Unlimited Strength Jurisdiction Policy Files, then you no longer need to download or install them. They are included in the JDK and are activated by default.

If your country or usage requires a more restrictive policy, the limited Java cryptographic policy files are still available.

If you have requirements that are not met by either of the policy files provided by default, then you can customize these policy files to meet your needs.

See the crypto.policy Security property in the /conf/security/java.security file, or Cryptographic Strength Configuration in the Java Platform, Standard Edition Security Developer's Guide.

You are advised to consult your export/import control counsel or attorney to determine the exact requirements.

Create PKCS12 Keystores

We recommend that you use the PKCS12 format for your keystores. This format, which is the default keystore type, is based on the RSA PKCS12 Personal Information Exchange Syntax Standard.

See Creating a Keystore to Use with JSSE in Java Platform, Standard Edition Security Developer's Guide and keytool in Java Development Kit Tool Specifications.

Changes to Garbage Collection

This section describes changes to garbage collection starting in JDK 9.

Make G1 the Default Garbage Collector

The Garbage-First Garbage Collector (G1 GC) is the default garbage collector in JDK 9 and later releases.

A low-pause collector such as G1 GC should provide a better overall experience, for most users, than a throughput-oriented collector such as the Parallel GC, which is the JDK 8 default.

See Ergonomic Defaults for G1 GC and Tunable Defaults in Java Platform, Standard Edition Java Virtual Machine Guide for more information about tuning G1 GC.

Removed GC Options

The following GC combinations will cause your application to fail to start in JDK 9 and later releases:

*   DefNew + CMS

*   ParNew + SerialOld

*   Incremental CMS

The foreground mode for CMS has also been removed. The command-line flags that were removed are 

-Xincgc, -XX:+CMSIncrementalMode, -XX:+UseCMSCompactAtFullCollection,

 -XX:+CMSFullGCsBeforeCompaction, and -XX:+UseCMSCollectionPassing.

The command-line flag -XX:+UseParNewGC no longer has an effect. The ParNew flag can be used only with CMS and CMS requires ParNew. Thus, the -XX:+UseParNewGC flag has been deprecated and is eligible for removal in a future release.

See JEP 214: Remove GC Combinations Deprecated in JDK 8.

Removed Permanent Generation

The permanent generation was removed in JDK 8, and the related VM options cause a warning to be printed. You should remove these options from your scripts:

-XX:MaxPermSize=size

-XX:PermSize=size

In JDK 9 and later releases, the JVM displays a warning like this:

Java HotSpot(TM) 64-Bit Server VM warning: Ignoring option MaxPermSize; support was removed in 8.0

Tools that are aware of the permanent generation may have to be updated.

See JEP 122: Remove the Permanent Generation and JDK 9 Release Notes - Removed APIs, Features, and Options .

Changes to GC Log Output

Garbage collection (GC) logging uses the JVM unified logging framework, and there are some differences between the new and the old logs. Any GC log parsers that you’re working with will probably need to change.

You may also need to update your JVM logging options. All GC-related logging should use the gc tag (for example, —Xlog:gc), usually in combination with other tags. The —XX:+PrintGCDetails and -XX:+PrintGC options have been deprecated.

See Enable Logging with the JVM Unified Logging Framework in the Java Development Kit Tool Specifications and JEP 271: Unified GC Logging.

Removed Tools and Components

This list includes tools and components that are no longer bundled with the JDK.

To know more about the tools and components that are removed in JDK 12, see APIs Removed in Java SE 12.

Removed Native-Header Generation Tool (javah)

The javah tool has been superseded by superior functionality in javac. It was removed in JDK 10.

Since JDK 8, javac provides the ability to write native header files at the time that Java source code is compiled, thereby eliminating the need for a separate tool.

Instead of javah, use

javac -h

Removed JavaDB

JavaDB, which was a rebranding of Apache Derby, is no longer included in the JDK.

JavaDB was bundled with JDK 7 and JDK 8. It was found in the db directory of the JDK installation directory.

You can download and install Apache Derby from Apache Derby Downloads.

Removed the JVM TI hprof Agent

The hprof agent library has been removed.

The hprof agent was written as demonstration code for the JVM Tool Interface and wasn’t intended to be a production tool. The useful features of the hprof agent have been superseded by better alternatives, including some that are included in the JDK.

For creating heap dumps in the hprof format, use a diagnostic command (jcmd) or the jmap tool:

Diagnostic command: jcmd  GC.heap_dump. See jcmd.

jmap: jmap -dump. See jmap.

For CPU profiler capabilities, use the Java Flight Recorder, which is bundled with the JDK.

See JEP 240: Remove the JVM TI hprof Agent.

Removed the jhat Tool

The jhat tool was an experimental, unsupported heap visualization tool added in JDK 6. Superior heap visualizers and analyzers have been available for many years.

Removed java-rmi.exe and java-rmi.cgi Launchers

The launchers java-rmi.exe from Windows and java-rmi.cgi from Linux and Solaris have been removed.

java-rmi.cgi was in $JAVA_HOME/bin on Linux and Solaris.

java-rmi.exe was in $JAVA_HOME/bin on Windows.

These launchers were added to the JDK to facilitate use of the RMI CGI proxy mechanism, which was deprecated in JDK 8.

The alternative of using a servlet to proxy RMI over HTTP has been available, and even preferred, for several years. See Java RMI and Object Serialization.

Removed Support for the IIOP Transport from the JMX RMIConnector

The IIOP transport support from the JMX RMI Connector along with its supporting classes have been removed from the JDK.

In JDK 8, support for the IIOP transport was downgraded from required to optional. This was the first step in a multirelease effort to remove support for the IIOP transport from the JMX Remote API. In JDK 9, support for IIOP was removed completely.

Public API changes include:

The javax.management.remote.rmi.RMIIIOPServerImpl class has been deprecated. Upon invocation, all its methods and constructors throw java.lang.UnsupportedOperationException with an explanatory message.

Two classes, org.omg.stub.javax.management.rmi._RMIConnection_Stub, and org.omg.stub.javax.management.rmi._RMIConnection_Tie, aren’t generated.

Dropped Windows 32–bit Client VM

The Windows 32–bit client VM is no longer available. Only a server VM is offered.

JDK 8 and earlier releases offered both a client JVM and a server JVM for Windows 32-bit systems. JDK 9 and later releases offer only a server JVM, which is tuned to maximize peak operating speed.

Removed Java VisualVM

Java VisualVM is a tool that provides information about code running on a Java Virtual Machine. The jvisualvm tool was provided with JDK 6, JDK 7, and JDK 8.

Java VisualVM is no longer bundled with the JDK, but you can get it from the VisualVM open source project site.

Removed native2ascii Tool

The native2ascii tool has been removed from the JDK. Because JDK 9 and later releases support UTF-8 based properties resource bundles, the conversion tool for UTF-8 based properties resource bundles to ISO-8859-1 is no longer needed.

See UTF-8 Properties Files in Java Platform, Standard Edition Internationalization Guide.

Removed macOS-Specific Features

This section includes macOS-specific features that have been removed, starting in JDK 9.

Platform-Specific Desktop Features

The java.awt.Desktop class contains replacements for the APIs in the Apple–specific com.apple.eawt and com.apple.eio packages. The new APIs supersede the macOS APIs and are platform-independent.

The APIs in the com.apple.eawt and com.apple.eio packages are encapsulated, so you won’t be able to compile against them in JDK 9 or later releases. However, they remain accessible at runtime, so existing code that is compiled to old versions continues to run. Eventually, libraries or applications that use the internal classes in theapple and com.applepackages and their subpackages will need to migrate to the new API.

The com.apple.concurrentand apple.applescript packages are removed without any replacement.

See JEP 272: Platform-Specific Desktop Features.

Removed AppleScript Engine

The AppleScript engine, a platform-specific javax.scriptimplementation, has been removed without any replacement in the JDK.

The AppleScript engine has been mostly unusable in recent releases. The functionality worked only in JDK 7 or JDK 8 on systems that already had Apple's version of the AppleScriptEngine.jar file on the system.

Next Steps

After you have your application working on JDK 13, here are some suggestions that can help you get the most from the Java SE Platform:

If needed, cross-compile to an older release of the platform using the new -–release flag in the javac tool.

Take advantage of your IDE’s suggestions for updating your code with the latest features.

Find out if your code is using deprecated APIs by running the static analysis tool jdeprscan. As already mentioned in this guide, APIs can be removed from the JDK, but only with advance notice.

Get familiar with new features like multi-release JAR files (see jar) .

Documentation Accessibility

For information about Oracle's commitment to accessibility, visit the Oracle Accessibility Program website at http://www.oracle.com/pls/topic/lookup?ctx=acc&id=docacc.

Access to Oracle Support

Oracle customers that have purchased support have access to electronic support through My Oracle Support. For information, visit http://www.oracle.com/pls/topic/lookup?ctx=acc&id=info or visit http://www.oracle.com/pls/topic/lookup?ctx=acc&id=trs if you are hearing impaired.

Java Platform, Standard Edition Oracle JDK Migration Guide, Release 13

F18399-01

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This guide will help you migrate your application from Oracle JDK 8 to Oracle JDK 9 or later.

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