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  1. PO
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    <p>I think that what you described is possible. First, create a parent POM where you declare dependencies in the <code>&lt;dependencyManagement&gt;</code> element:</p> <pre><code>&lt;project&gt; &lt;modelVersion&gt;4.0.0&lt;/modelVersion&gt; &lt;groupId&gt;groupIdA&lt;groupId&gt; &lt;artifactId&gt;parent&lt;/artifactId&gt; &lt;packaging&gt;pom&lt;packaging&gt; &lt;version&gt;1-SNAPSHOT&lt;/version&gt; ... &lt;dependencyManagement&gt; &lt;!-- Standard dependencies used in several build modules. Ensures all modules use the same version for these dependencies --&gt; &lt;dependencies&gt; &lt;dependency&gt; &lt;groupId&gt;org.directwebremoting&lt;/groupId&gt; &lt;artifactId&gt;dwr&lt;/artifactId&gt; &lt;version&gt;3.0.M1&lt;/version&gt; &lt;/dependency&gt; &lt;dependency&gt; &lt;groupId&gt;org.springframework&lt;/groupId&gt; &lt;artifactId&gt;spring-webmvc&lt;/artifactId&gt; &lt;version&gt;3.0.0.RELEASE&lt;/version&gt; &lt;/dependency&gt; ... &lt;/dependencies&gt; &lt;dependencyManagement&gt; ... &lt;/project&gt; </code></pre> <p>Then, in a child project, declare the dependencies you need without declaring their version:</p> <pre><code>&lt;project&gt; &lt;modelVersion&gt;4.0.0&lt;/modelVersion&gt; &lt;parent&gt; &lt;artifactId&gt;parent&lt;/artifactId&gt; &lt;groupId&gt;groupIdA&lt;/groupId&gt; &lt;version&gt;1-SNAPSHOT&lt;/version&gt; &lt;/parent&gt; &lt;artifactId&gt;childB&lt;/artifactId&gt; &lt;version&gt;1.0-SNAPSHOT&lt;/version&gt; &lt;packaging&gt;jar&lt;/packaging&gt; &lt;dependencies&gt; &lt;dependency&gt; &lt;groupId&gt;org.directwebremoting&lt;/groupId&gt; &lt;artifactId&gt;dwr&lt;/artifactId&gt; &lt;/dependency&gt; &lt;dependency&gt; &lt;groupId&gt;org.springframework&lt;/groupId&gt; &lt;artifactId&gt;spring-webmvc&lt;/artifactId&gt; &lt;/dependency&gt; ... &lt;/dependencies&gt; ... &lt;/project&gt; </code></pre> <p>Finally, use the default <a href="http://maven.apache.org/plugins/maven-assembly-plugin/descriptor-refs.html#jar-with-dependencies" rel="nofollow noreferrer"><code>jar-with-dependencies</code></a> predefined assembly descriptor to create a <em>general assembly of a binary package with all the dependency libraries included unpacked inside the archive</em>.</p> <pre><code>&lt;project&gt; [...] &lt;build&gt; [...] &lt;plugins&gt; &lt;plugin&gt; &lt;artifactId&gt;maven-assembly-plugin&lt;/artifactId&gt; &lt;version&gt;2.2-beta-5&lt;/version&gt; &lt;configuration&gt; &lt;descriptorRefs&gt; &lt;descriptorRef&gt;jar-with-dependencies&lt;/descriptorRef&gt; &lt;/descriptorRefs&gt; &lt;/configuration&gt; &lt;executions&gt; &lt;execution&gt; &lt;id&gt;make-assembly&lt;/id&gt; &lt;!-- this is used for inheritance merges --&gt; &lt;phase&gt;package&lt;/phase&gt; &lt;!-- append to the packaging phase. --&gt; &lt;goals&gt; &lt;goal&gt;single&lt;/goal&gt; &lt;!-- goals == mojos --&gt; &lt;/goals&gt; &lt;/execution&gt; &lt;/executions&gt; &lt;/plugin&gt; [...] &lt;/plugins&gt; &lt;/build&gt; &lt;/project&gt; </code></pre> <p>To create the project assembly, trigger the <em>package</em> phase:</p> <pre><code>mvn package </code></pre> <p>And this will produce the following assembly in the target directory:</p> <pre><code>target/child-1.0-SNAPSHOT-jar-with-dependencies.jar </code></pre> <p>I'm just not sure of what you want to do with this assembly (use it as dependency in portlet projects vs pull dependencies from the parent POM? ease the liferay deployment only?). All options are possible though.</p> <p>Refer to the <a href="http://maven.apache.org/plugins/maven-assembly-plugin/" rel="nofollow noreferrer">Maven Assembly plugin</a> documentation for more details. </p>
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    1. POBundling different java classes in a single jar files in a single jar
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    1. USPascal Thivent
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    1. COHi Pascal, I tried several different configurations of the assembly plugin without much success, meaning I could not make it do what I wanted. What I want to do with the generated jar file is have a unique jar file that is loaded in the shared lib directory of jboss so all the different portlets share the classes. Currently, we have all the jar files in server/servername/lib/ext but is a painfully annoying when there is a change in the libraries, really error prone, this way we have a unique jar file, that has only the required libraries, drop one file and you are done.
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    2. CO@feniix What I'm suggesting allows you to do that (I used this descriptor numerous times) and is the most straightforward way (especially since you just have to copy&paste the configuration).
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    3. COI am not saying it does not work :) In my case, with the list of libraries I wanted, the assembly method is leaving some libraries out, I think it is a bug but the dependency method has exactly ALL the classes from the dependencies and the assembly method is missing some. It is weird though, I will see if I try to report a bug to apache fsf
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