MAVEN PLUGIN(S) SERIES - Find duplicate classes or resources

Maven Duplicate Finder Plugin  

com.ning.maven.plugins:maven-duplicate-finder-plugin:1.0.2:check

This plugin helps to find duplicate classes and/or resources within project's dependencies. It's very straightforward to use 

From command line

mvn com.ning.maven.plugins:maven-duplicate-finder-plugin:1.0.2:check

Include in normal build

<plugin>
  <groupId>com.ning.maven.plugins</groupId>
  <artifactId>maven-duplicate-finder-plugin</artifactId>
  <executions>
    <execution>
      <phase>verify</phase>
      <goals>
        <goal>check</goal>
      </goals>
    </execution>
  </executions>
</plugin>

Configuration

There are several option that make this plugin very flexible:
  • It is possible break the build upon duplicate detection
  • It is possible add exceptions (i.e. allow duplicate classes or resources for specific artifacts)
  • It is possible ignore dependencies from check

Output sample

[WARNING] Found duplicate classes in [commons-logging:commons-logging:1.1.1,commons-logging:commons-logging-api:1.1] :
[WARNING]   org.apache.commons.logging.Log
[WARNING]   org.apache.commons.logging.LogConfigurationException
[WARNING]   org.apache.commons.logging.LogFactory
[WARNING]   org.apache.commons.logging.LogSource
[WARNING]   org.apache.commons.logging.impl.Jdk14Logger
[WARNING]   org.apache.commons.logging.impl.LogFactoryImpl
[WARNING]   org.apache.commons.logging.impl.NoOpLog
[WARNING]   org.apache.commons.logging.impl.SimpleLog
[WARNING]   org.apache.commons.logging.impl.WeakHashtable
[WARNING] Found duplicate resources in [org.springframework:spring-aop:3.0.3.RELEASE,org.springframework:spring-beans:3.0.3.RELEASE,org.springframework:spring-context:3.0.3.RELEASE,org.springframework:spring-core:3.0.3.RELEASE] :
[WARNING]   overview.html
[WARNING] Found duplicate resources in [org.springframework:spring-aop:3.0.3.RELEASE,org.springframework:spring-beans:3.0.3.RELEASE,org.springframework:spring-context:3.0.3.RELEASE] :
[WARNING]   META-INF/spring.tooling

License

License is  Apache License Version 2.0

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