Shade and assembly plugin: Assembling a jar containing packed jars

[Jeremy Lewi]

Hi,

I'm working on Apache AVRO (Issue 570) and I'm having a maven issue that I
was hoping to get some help with. The pre-existing pom.xml
is using the shade plugin to build a jar which includes all of the
dependencies, unpacked.  The configuration is below.

  <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-shade-plugin</artifactId>
        <version>1.4</version>
        <!-- primary artifact is shaded -->
        <executions>
          <execution>
            <goals>
              <goal>shade</goal>
            </goals>
            <configuration>
              <transformers>
                <transformer

implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
                  <mainClass>org.apache.avro.tool.Main</mainClass>
                </transformer>
              </transformers>
            </configuration>
          </execution>
        </executions>
      </plugin>

The net result of running the shade plugin is three jars
 1. avro-tools-1.6.0-SNAPSHOT.jar - which includes all of the dependency
jars as well as the classes specific to this project.
 2. original-avro-tools-1.6.0-SNAPSHOT.jar - which doesn't include any
dependency files
 3. avro-tools-1.6.0-SNAPSHOT-nodeps.jar - which seems to be the same
as original-avro-tools-1.6.0-SNAPSHOT.jar.

Now I need to build another jar, avro-tools-1.6.0-SNAPSHOT-job.jar, which
places all the jars on which we depend in the directory "lib"
inside avro-tools-1.6.0-SNAPSHOT-job.jar. avro-tools-1.6.0-SNAPSHOT-job.jar
should also contain the class files for avro-tools.

Because the shaded plugin causes avro-tools-1.6.0-SNAPSHOT.jar to contain
unpacked versions of all dependencies, I set my maven assembly configuration
to use the "nodeps" version of the avro-tools jar.
Unfortunately, this prevents any of the tools code from being included in
the jar built by the assembly plugin.

This is the configuration for my assembly file.

<assembly
  xmlns="
http://maven.apache.org/plugins/maven-assembly-plugin/assembly/1.1.0";
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";
  xsi:schemaLocation="
http://maven.apache.org/plugins/maven-assembly-plugin/assembly/1.1.0
    http://maven.apache.org/xsd/assembly-1.1.0.xsd";>
  <id>job</id>
  <formats>
   <format>jar</format>
  </formats>
  <includeBaseDirectory>false</includeBaseDirectory>
  <dependencySets>
    <dependencySet>
      <unpack>false</unpack>
      <scope>runtime</scope>
      <outputDirectory>lib</outputDirectory>
       <excludes>
         <exclude>org.apache.avro:avro-tools</exclude>
      </excludes>
    </dependencySet>
    <dependencySet>
      <unpack>true</unpack>
      <scope>runtime</scope>
      <outputDirectory>/</outputDirectory>
      <includes>

<include>org.apache.avro:avro-tools:jar:${project.version}:nodeps</include>
      </includes>
      <unpackOptions>
<excludes>
  <exclude>META-INF</exclude>
  <exclude>META-INF/**</exclude>
</excludes>
      </unpackOptions>
    </dependencySet>
  </dependencySets>
</assembly>

If I remove "nodeps" then the jar built by the assembly plugin ends up
containing unpacked as well as packed versions of the dependencies because
its using
avro-tools-1.6.0-SNAPSHOT.jar

Can anyone tell me how I can leave the shaded plugin configured as is, and
still use the assembly plugin to build   avro-tools-1.6.0-SNAPSHOT-job.jar?

Thanks
Jeremy