如何避免Maven构建中出现“重叠类”警告？

Question

如何避免Maven构建中出现“重叠类”警告？

7

我有一个模块依赖于其他两个项目，但是在构建项目时出现了以下问题：

虽然没有错误，但我收到了很多关于重叠相同类的警告：

[WARNING] commons-logging-1.2.jar, jcl-over-slf4j-1.7.12.jar define 6 overlappping classes: 
[WARNING]   - org.apache.commons.logging.impl.SimpleLog$1
[WARNING]   - org.apache.commons.logging.Log
[WARNING]   - org.apache.commons.logging.impl.SimpleLog
[WARNING]   - org.apache.commons.logging.LogConfigurationException
[WARNING]   - org.apache.commons.logging.impl.NoOpLog
[WARNING]   - org.apache.commons.logging.LogFactory
[WARNING] aspectjrt-1.7.0.jar, aspectjweaver-1.8.6.jar define 128 overlappping classes: 
[WARNING]   - org.aspectj.internal.lang.reflect.SignaturePatternImpl
[WARNING]   - org.aspectj.runtime.reflect.SignatureImpl
[WARNING]   - org.aspectj.internal.lang.reflect.DeclareSoftImpl
[WARNING]   - org.aspectj.lang.reflect.AjType
[WARNING]   - org.aspectj.lang.JoinPoint$StaticPart
[WARNING]   - org.aspectj.runtime.internal.cflowstack.ThreadStackImpl11
[WARNING]   - org.aspectj.runtime.internal.cflowstack.ThreadStack
[WARNING]   - org.aspectj.internal.lang.reflect.InterTypeDeclarationImpl
[WARNING]   - org.aspectj.internal.lang.reflect.DeclareAnnotationImpl
[WARNING]   - org.aspectj.lang.annotation.SuppressAjWarnings
[WARNING]   - 118 more...
[WARNING] maven-shade-plugin has detected that some .class files
[WARNING] are present in two or more JARs. When this happens, only
[WARNING] one single version of the class is copied in the uberjar.
[WARNING] Usually this is not harmful and you can skeep these
[WARNING] warnings, otherwise try to manually exclude artifacts
[WARNING] based on mvn dependency:tree -Ddetail=true and the above
[WARNING] output
[WARNING] See http://docs.codehaus.org/display/MAVENUSER/Shade+Plugin
[INFO] Replacing original artifact with shaded artifact.

我该如何避免这些警告？

- Anuj Vishwakarma

1个回答

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- VonC · Accepted Answer

使用Maven插件依赖树，并且要做到这一点。

mvn clean dependency:tree
# or (mvn 3)
mvn clean org.apache.maven.plugins:maven-dependency-plugin:3.0.1:tree

clean很重要，以避免旧的target内容产生任何副作用。

然后，根据您使用的插件，您可以添加排除规则，如this answer所示，以避免这些错误消息。

如MRUNIT-209中所示，dependency-tree的2.5.1版本不适用于Maven 3.x.x。
使用完整名称org.apache.maven.plugins:maven-dependency-plugin:3.0.1:tree将强制使用maven-dependency-plugin的3.0.1版本。