How can a jar with specific deps be created, after using maven-dependency-plugin to select the wanted deps? - maven

Question

My goal is to create a jar with specific dependencies from my dependency list in the pom. I'm using maven-dependency-plugin like so:
<plugin>
<artifactId>maven-dependency-plugin</artifactId>
<executions>
<execution>
<id>copy-dependencies</id>
<goals>
<goal>unpack-dependencies</goal>
</goals>
<phase>prepare-package</phase>
<configuration>
<includeScope>runtime</includeScope>
<excludes>META-INF/*.SF,META-INF/*.DSA,META-INF/*.RSA</excludes>
<outputDirectory>${project.build.directory}/uber-deps/</outputDirectory>
</configuration>
</execution>
</executions>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-assembly-plugin</artifactId>
<executions>
<execution>
<phase>package</phase>
<configuration>
<transformers>
<transformer implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
<mainClass>com.some.blaClass</mainClass>
</transformer>
</transformers>
</configuration>
</execution>
</executions>
</plugin>
and an assembly.xml file holding:
<assembly xmlns="http://maven.apache.org/ASSEMBLY/2.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/ASSEMBLY/2.0.0 http://maven.apache.org/xsd/assembly-2.0.0.xsd">
<id>plugin</id>
<formats>
<format>jar</format>
</formats>
<includeBaseDirectory>false</includeBaseDirectory>
<dependencySets>
<dependencySet>
<outputDirectory>/</outputDirectory>
<useProjectArtifact>true</useProjectArtifact>
<unpack>true</unpack>
<scope>runtime</scope>
<includes>
<include>
${project.build.directory}/uber-deps/
</include>
</includes>
<excludes>
<exclude>*:sources</exclude>
</excludes>
</dependencySet>
</dependencySets>
</assembly>
After mvn clean install all relevant dependencies appear in target/uber-deps as I would expect. My problem is with the next plugin under <plugins> - maven-assembly-plugin. Seems to me as if it doesn't take uber-deps in.
I know this only by trying to unpack the jar using jar xf to see if the deps in uber-deps were packed in the jar created after mvn clean install.
What should be changed?

Answer 1

1)
The jar you are building as part of the assembly-plugin will be called (by default) ./target/<artifactId>-plugin.jar
Note that the plugin part is what you've put under id in your assembly xml file.
2)
Since you already unpack the dependencies to a folder, you should use fileSets rather then dependencySets:
<fileSets>
<fileSets>
<fileSet>
<outputDirectory>/</outputDirectory>
<includes>
<include>
${project.build.directory}/uber-deps/
</include>
</includes>
</fileSet>
</fileSets>
</fileSets>
3)
BTW if you want the outputs of your own project in that jar you should add another fileSet:
<fileSet>
<outputDirectory>/</outputDirectory>
<includes>
<include>
${project.build.outputDirectory}
</include>
</includes>
</fileSet>
4) Also just noted that your assembly plugin definition is not stating the location of your assembly xml file and that you try to define mainClass using shade-plugin configuration. This is how it should look in assembly plugin (assuming that your assembly file is located under src/assembly/plugin.xml:
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-assembly-plugin</artifactId>
<executions>
<execution>
<phase>package</phase>
<configuration>
<descriptors>
<descriptor>src/assembly/plugin.xml</descriptor>
</descriptors>
<archive>
<manifest>
<mainClass>com.some.blaClass</mainClass>
</manifest>
</archive>
</configuration>
</execution>
</executions>
</plugin>