I'm using maven assembly plugin to package a distribution of my project that contains a lib folder with dependency jars, a config folder with resources and the jar file containing the project class files. I need to exclude a package from one of the dependency jars in the lib folder.
The assembly plugin has an option to unpack dependency jars, and if this is used then you can exclude a package with assembly.xml like so:
<assembly>
<formats>
<format>tar</format>
</formats>
<includeBaseDirectory>false</includeBaseDirectory>
<dependencySets>
<dependencySet>
<unpack>true</unpack>
<useProjectArtifact>false</useProjectArtifact>
<outputDirectory>./${project.build.finalName}/lib</outputDirectory>
<scope>runtime</scope>
<unpackOptions>
<excludes>
<exclude>**/excludedpackage/**<exclude>
</excludes>
</unpackOptions>
</dependencySet>
</dependencySets>
</assembly>
My question is, how can I exclude a package from a dependency jar without using unpack (i.e. keeping all dependencies packed as jars)? Ideally I'd like a solution that can be done using assembly plugin - if that's not possible what is the simplest way to achieve what I want to do?
I don't think you can repack the JAR after it has been unpacked and filtered. You could submit an enhancement-request at the Maven Assembly Plugin JIRA.
A (complicated) workaround would be to use the maven-dependency-plugin to unpack the project's dependency that you want to exclude something from, then use the maven-jar-plugin to jar the classes again excluding a package in a new JAR and finally declare a <files> element for the maven-assembly-plugin for that particular dependency.
A sample configuration would be
<plugin>
<artifactId>maven-dependency-plugin</artifactId>
<version>2.10</version>
<executions>
<execution>
<id>unpack</id>
<goals>
<goal>unpack-dependencies</goal>
</goals>
<phase>prepare-package</phase>
<configuration>
<includeArtifactIds><!-- include here the dependency you want to exclude something from --></includeArtifactIds>
<outputDirectory>${project.build.directory}/unpack/temp</outputDirectory>
</configuration>
</execution>
</executions>
</plugin>
<plugin>
<artifactId>maven-jar-plugin</artifactId>
<version>2.6</version>
<executions>
<execution>
<id>repack</id>
<goals>
<goal>jar</goal>
</goals>
<phase>prepare-package</phase>
<configuration>
<classesDirectory>${project.build.directory}/unpack/temp</classesDirectory>
<excludes>
<exclude>**/excludedpackage/**</exclude>
</excludes>
<outputDirectory>${project.build.directory}/unpack</outputDirectory>
<finalName>wonderful-library-repackaged</finalName> <!-- give a proper name here -->
</configuration>
</execution>
</executions>
</plugin>
Then in your assembly configuration, you would have:
<files>
<file>
<source>${project.build.directory}/unpack/wonderful-library-repackaged.jar</source>
<outputDirectory>/${project.build.finalName}/lib</outputDirectory>
</file>
</files>
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