在正确目录下生成的jar中无法解析POM中指定的依赖项

Question

I want to create a JAR file of my maven application. So to bundle the dependencies I have used the maven-assembly-plugin. But I want that the dependencies should go the lib/ folder and not anywhere else. My current pom.xml plugin tag is

<plugin>
            <artifactId>maven-assembly-plugin</artifactId>
            <version>2.4.1</version>
            <configuration>
                <descriptorRefs>
                    <descriptorRef>jar-with-dependencies</descriptorRef>
                </descriptorRefs>
            </configuration>
            <executions>
                <execution>
                    <id>make-assembly</id>
                    <phase>package</phase>
                    <goals>
                        <goal>single</goal>
                    </goals>
                </execution>
            </executions>
        </plugin>

Please suggest. Also is it possible to achieve the same with maven jar plugin.

After the above changes in POM The dependencies get generated in the jar which is generated with suffix 'jar-with-dependencies'. But the dependent jars are scattered I want all those dependent jars to be part of one folder lib similart to WEB-INF/lib for war files. How do I achieve this?

Answer 1

You can achieve this with a custom assembly descriptor (a xml file) like this:

<assembly
   xmlns="http://maven.apache.org/plugins/maven-assembly-plugin/assembly/1.1.2"
   xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
   xsi:schemaLocation="http://maven.apache.org/plugins/maven-assembly-plugin/assembly/1.1.2 http://maven.apache.org/xsd/assembly-1.1.2.xsd">

  <id>dist</id>

  <formats>
    <format>dir</format>
  </formats>

  <fileSets>
    <fileSet>
      <directory>target</directory>
      <outputDirectory>/</outputDirectory>
      <includes>
        <include>your-application.jar</include>
      </includes>
    </fileSet>
  </fileSets>

  <dependencySets>
    <dependencySet>
      <outputDirectory>lib</outputDirectory>
    </dependencySet>
  </dependencySets>

</assembly>

You have to point to the assembly descriptor in your maven assembly plugin configuration:

<plugin>
  <groupId>org.apache.maven.plugins</groupId>
  <artifactId>maven-assembly-plugin</artifactId>
  <version>2.4.1</version>
  <configuration>
    <descriptors>
      <descriptor>assemble.xml</descriptor>
    </descriptors>
  </configuration>
  ...
</plugin>

Hope that helps