解决tomcat7安装后启动时一闪而退的bug

 问题描述

   从apache官网下载64位tomcat7.0.90安装包文件解压到个人电脑D盘后，进入tomcat服务器的bin目录双击startup.bat windows批处理文件启动tomcat服务器时，出现闪退。

解决办法

       关于tomcat服务器启动出现闪退的问题，网上已有关于解决此类问题的描述，大部分都是因为未配置JAVA_HOME, JRE_HOME和CATALINA_HOME等环境变量而引起的。关于如何配置 3个环境变量，很多关于解决tomcat服务器启动闪退的博客甚至百度经验上都有，此处就不赘述了。不懂的同学可以参考这篇博客

如何解决tomcat启动闪退问题

但是也有特殊情况，就是你配置了上述环境变量后再此启动tomcat服务器还出现闪退的Bug, 这个时候我们就需要查看日志找到问题产生的原因。进入tomcat根目录的log文件夹如下图所示：

找到最近产生的catalina.+日期.txt文件，使用nodepad++打开查看内容，并把日志信息粘贴如下

九月 09, 2018 1:52:31 上午 org.apache.catalina.core.AprLifecycleListener init

警告: The APR based Apache Tomcat Native library failed to load. The error reported was [D:\tomcat7.0\apache-tomcat-7.0.90\bin\tcnative-1.dll: Can't load AMD 64-bit .dll on a IA 32-bit platform]

java.lang.UnsatisfiedLinkError: D:\tomcat7.0\apache-tomcat-7.0.90\bin\tcnative-1.dll: Can't load AMD 64-bit .dll on a IA 32-bit platform

at java.lang.ClassLoader$NativeLibrary.load(Native Method)

at java.lang.ClassLoader.loadLibrary0(Unknown Source)

at java.lang.ClassLoader.loadLibrary(Unknown Source)

at java.lang.Runtime.loadLibrary0(Unknown Source)

at java.lang.System.loadLibrary(Unknown Source)

at org.apache.tomcat.jni.Library.(Library.java:42)

at org.apache.tomcat.jni.Library.initialize(Library.java:178)

at org.apache.catalina.core.AprLifecycleListener.init(AprLifecycleListener.java:200)

at org.apache.catalina.core.AprLifecycleListener.isAprAvailable(AprLifecycleListener.java:108)

at org.apache.catalina.connector.Connector.setProtocol(Connector.java:592)

at org.apache.catalina.connector.Connector.(Connector.java:66)

at org.apache.catalina.startup.ConnectorCreateRule.begin(ConnectorCreateRule.java:62)

at org.apache.tomcat.util.digester.Digester.startElement(Digester.java:1303)

at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.startElement(Unknown Source)

at com.sun.org.apache.xerces.internal.parsers.AbstractXMLDocumentParser.emptyElement(Unknown Source)

at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanStartElement(Unknown Source)

at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl$FragmentContentDriver.next(Unknown Source)

at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.next(Unknown Source)

at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown Source)

at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(Unknown Source)

at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(Unknown Source)

at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(Unknown Source)

at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(Unknown Source)

at com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl$JAXPSAXParser.parse(Unknown Source)

at org.apache.tomcat.util.digester.Digester.parse(Digester.java:1576)

at org.apache.catalina.startup.Catalina.load(Catalina.java:628)

at org.apache.catalina.startup.Catalina.load(Catalina.java:679)

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)

at java.lang.reflect.Method.invoke(Unknown Source)

at org.apache.catalina.startup.Bootstrap.load(Bootstrap.java:253)

at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:427)

 

九月 09, 2018 1:52:32 上午 org.apache.catalina.startup.VersionLoggerListener log

信息: Server version: Apache Tomcat/7.0.90

九月 09, 2018 1:52:32 上午 org.apache.catalina.startup.VersionLoggerListener log

信息: Server built: Jul 2 2018 17:05:37 UTC

九月 09, 2018 1:52:32 上午 org.apache.catalina.startup.VersionLoggerListener log

信息: Server number: 7.0.90.0

九月 09, 2018 1:52:32 上午 org.apache.catalina.startup.VersionLoggerListener log

信息: OS Name: Windows 10

九月 09, 2018 1:52:32 上午 org.apache.catalina.startup.VersionLoggerListener log

信息: OS Version: 10.0

九月 09, 2018 1:52:32 上午 org.apache.catalina.startup.VersionLoggerListener log

信息: Architecture: x86

九月 09, 2018 1:52:32 上午 org.apache.catalina.startup.VersionLoggerListener log

信息: Java Home: C:\Program Files (x86)\Java\jre1.8.0_161

九月 09, 2018 1:52:32 上午 org.apache.catalina.startup.VersionLoggerListener log

信息: JVM Version: 1.8.0_161-b12

九月 09, 2018 1:52:32 上午 org.apache.catalina.startup.VersionLoggerListener log

信息: JVM Vendor: Oracle Corporation

九月 09, 2018 1:52:32 上午 org.apache.catalina.startup.VersionLoggerListener log

信息: CATALINA_BASE: D:\tomcat7.0\apache-tomcat-7.0.90

九月 09, 2018 1:52:32 上午 org.apache.catalina.startup.VersionLoggerListener log

信息: CATALINA_HOME: D:\tomcat7.0\apache-tomcat-7.0.90

九月 09, 2018 1:52:32 上午 org.apache.catalina.startup.VersionLoggerListener log

信息: Command line argument: -Djava.util.logging.config.file=D:\tomcat7.0\apache-tomcat-7.0.90\conf\logging.properties

九月 09, 2018 1:52:32 上午 org.apache.catalina.startup.VersionLoggerListener log

信息: Command line argument: -Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager

九月 09, 2018 1:52:32 上午 org.apache.catalina.startup.VersionLoggerListener log

信息: Command line argument: -Djdk.tls.ephemeralDHKeySize=2048

九月 09, 2018 1:52:32 上午 org.apache.catalina.startup.VersionLoggerListener log

信息: Command line argument: -Dignore.endorsed.dirs=

九月 09, 2018 1:52:32 上午 org.apache.catalina.startup.VersionLoggerListener log

信息: Command line argument: -Dcatalina.base=D:\tomcat7.0\apache-tomcat-7.0.90

九月 09, 2018 1:52:32 上午 org.apache.catalina.startup.VersionLoggerListener log

信息: Command line argument: -Dcatalina.home=D:\tomcat7.0\apache-tomcat-7.0.90

九月 09, 2018 1:52:32 上午 org.apache.catalina.startup.VersionLoggerListener log

信息: Command line argument: -Djava.io.tmpdir=D:\tomcat7.0\apache-tomcat-7.0.90\temp

九月 09, 2018 1:52:32 上午 org.apache.coyote.AbstractProtocol init

信息: Initializing ProtocolHandler ["http-bio-8080"]

九月 09, 2018 1:52:32 上午 org.apache.coyote.AbstractProtocol init

严重: Failed to initialize end point associated with ProtocolHandler ["http-bio-8080"]

java.net.BindException: Address already in use: JVM_Bind :8080

at org.apache.tomcat.util.net.JIoEndpoint.bind(JIoEndpoint.java:413)

at org.apache.tomcat.util.net.AbstractEndpoint.init(AbstractEndpoint.java:728)

at org.apache.coyote.AbstractProtocol.init(AbstractProtocol.java:452)

at org.apache.coyote.http11.AbstractHttp11JsseProtocol.init(AbstractHttp11JsseProtocol.java:119)

at org.apache.catalina.connector.Connector.initInternal(Connector.java:978)

at org.apache.catalina.util.LifecycleBase.init(LifecycleBase.java:102)

at org.apache.catalina.core.StandardService.initInternal(StandardService.java:560)

at org.apache.catalina.util.LifecycleBase.init(LifecycleBase.java:102)

at org.apache.catalina.core.StandardServer.initInternal(StandardServer.java:840)

at org.apache.catalina.util.LifecycleBase.init(LifecycleBase.java:102)

at org.apache.catalina.startup.Catalina.load(Catalina.java:654)

at org.apache.catalina.startup.Catalina.load(Catalina.java:679)

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)

at java.lang.reflect.Method.invoke(Unknown Source)

at org.apache.catalina.startup.Bootstrap.load(Bootstrap.java:253)

at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:427)

Caused by: java.net.BindException: Address already in use: JVM_Bind

at java.net.DualStackPlainSocketImpl.bind0(Native Method)

at java.net.DualStackPlainSocketImpl.socketBind(Unknown Source)

at java.net.AbstractPlainSocketImpl.bind(Unknown Source)

at java.net.PlainSocketImpl.bind(Unknown Source)

at java.net.ServerSocket.bind(Unknown Source)

at java.net.ServerSocket.(Unknown Source)

at java.net.ServerSocket.(Unknown Source)

at org.apache.tomcat.util.net.DefaultServerSocketFactory.createSocket(DefaultServerSocketFactory.java:49)

at org.apache.tomcat.util.net.JIoEndpoint.bind(JIoEndpoint.java:400)

... 17 more

     通过查看以上日志信息，我们发现这个bug主要由两处错误引起，第一处错误：

The APR based Apache Tomcat Native library failed to load. The error reported was [D:\tomcat7.0\apache-tomcat-7.0.90\bin\tcnative-1.dll: Can't load AMD 64-bit .dll on a IA 32-bit platform]

java.lang.UnsatisfiedLinkError: D:\tomcat7.0\apache-tomcat-7.0.90\bin\tcnative-1.dll: Can't load AMD 64-bit .dll on a IA 32-bit platform

原来是因为我的jdk平台是32位的，而tomcat7.0却是64位的，导致tomcat启动过程中加载native library失败。通过最开始的dos控制台信息我们发现tomcat启动时用到了jre，而我的环境变量配置的jre路径却是32位的(C:\Program Files (x86)目录下的安装软件都属于32bit位的软件）。原来的jdk和jre环境变量配置如下图所示

将jdk和jre的环境变量值加入到path值中，原来已配置好（如下图，本人采用的是win 10系统）

因此我的解决办法是安装64bit位的jdk，然后重新配置jdk和jre环境变量即可，配置后的jdk和jre环境变量如下图所示：

然后我们再来看第二处错误： java.net.BindException: Address already in use: JVM_Bind :8080

这说明8080端口已被占用，这是由于我之前安装过32位的tomcat8.0并启动成功过导致的，这个问题我们可以通过tomcat\conf目录下的server.xml服务器的配置文件修改启动端口号来解决，tomcat服务器启动时默认的连接端口号是8080,现在我们把它改为8088就不会出现端口被占用的冲突了

                 connectionTimeout="20000"
               redirectPort="8443" />

重启电脑后进入tomcat\bin目录，双击startup.bat文件不再出现闪退，并显示tomcat服务器启动成功，如下图所示。

进入浏览器输入http://localhost:8088并回车，进入如下界面说明tomcat服务器确实启动成功，问题到此得以解决