Maven

dependency in maven

• Problem An error happened when build a Spring project:

  java.lang.LinkageError: ClassCastException: attempting to castjar:file: ....../javax.ws-api-2.0.1-jar to 
                                      ....../javax.ws-api-2.0.1-jar  
                                      //(the absolute path of the two file is the same )
  

• Reason

It seems like there are two library depends on the same jar(javax.ws-api-2.0.1-jar), but the way they package dependency is not the same.

• Solution

One way i found is remove the “shaded” from dependency declaration.

Old format:

<dependency>
  <groupId>com.spotify</groupId>
  <artifactId>docker-client</artifactId>
  <classifier>shaded</classifier>
  <version>8.9.0</version>
  ...
</dependency>

Updated format:

<dependency>
  <groupId>com.spotify</groupId>
  <artifactId>docker-client</artifactId>

  <version>8.9.0</version>
  ...
</dependency>

Reference

maven-shade-plugin: Repackages the project classes together with their dependencies into a single uber-jar, optionally renaming classes or removing unused classes.