FindBugs, a program which uses static analysis to look for bugs in Java code. It is free software, distributed under the terms of the Lesser GNU Public License. The name FindBugs™ and the FindBugs logo are trademarked by The University of Maryland. FindBugs has been downloaded more than a million times.
Checkstyle is a development tool to help programmers write Java code that adheres to a coding standard. It automates the process of checking Java code to spare humans of this boring (but important) task. This makes it ideal for projects that want to enforce a coding standard.
PMD is a source code analyzer. It finds common programming flaws like unused variables, empty catch blocks, unnecessary object creation, and so forth. It supports Java, JavaScript, Salesforce.com Apex and Visualforce, PLSQL, Apache Velocity, XML, XSL.
Additionally it includes CPD, the copy-paste-detector. CPD finds duplicated code in Java, C, C++, C#, Groovy, PHP, Ruby, Fortran, JavaScript, PLSQL, Apache Velocity, Scala, Objective C, Matlab, Python, Go, Swift and Salesforce.com Apex and Visualforce.
JDepend traverses Java class file directories and generates design quality metrics for each Java package. JDepend allows you to automatically measure the quality of a design in terms of its extensibility, reusability, and maintainability to manage package dependencies effectively.
a free Java code coverage tool
Emma:http://emma.sourceforge.net/
eclemma(Emma Eclipse Plugin, 开始基于Emma后来基于JaCoCo):http://www.eclemma.org/
maven-emma-plugin(for Maven 1.x): http://emma.sourceforge.net/maven-emma-plugin/
emma-maven-plugin(for Maven 2.0+): https://github.com/jiangxincode/emma-maven-plugin
JaCoCo: https://www.eclemma.org/jacoco/index.html
Getting “Skipping JaCoCo execution due to missing execution data file” upon executing JaCoCo? https://stackoverflow.com/questions/18107375/getting-skipping-jacoco-execution-due-to-missing-execution-data-file-upon-exec
Testng, Emma, Cobertura, coverage and JDK 7 result in ClassFormatError and VerifyError: https://stackoverflow.com/questions/7010665/testng-emma-cobertura-coverage-and-jdk-7-result-in-classformaterror-and-verif
Java 6 -> 7 migration ClassFormatError: Illegal local variable table length: https://stackoverflow.com/questions/21917985/java-6-7-migration-classformaterror-illegal-local-variable-table-length
Cobertura is a free Java code coverage reporting tool.
JavaNCSS - A Source Measurement Suite for Java
Simian (Similarity Analyser) identifies duplication in Java, C#, C, C++, COBOL, Ruby, JSP, ASP, HTML, XML, Visual Basic, Groovy source code and even plain text files. In fact, simian can be used on any human readable files such as ini files, deployment descriptors, you name it.
注:If you like simian-maven-plugin, you can vote for my answer on http://stackoverflow.com/questions/1077700/how-do-you-use-the-maven-simian-plugin-in-maven2
SourceMonitor lets you see inside your software source code to find out how much code you have and to identify the relative complexity of your modules. For example, you can use SourceMonitor to identify the code that is most likely to contain defects and thus warrants formal review.
cloc counts blank lines, comment lines, and physical lines of source code in many programming languages.
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