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    copied!<p>Simplify project configuration. Separate java source code from <code>WAR</code> to <code>JAR</code>. After this you can simply add this <code>JAR</code> to another <code>WAR</code> as dependency. <em>Merging</em> java code in this case is not good idea. </p> <p>For merging resources from <code>WAR</code> use maven <a href="http://maven.apache.org/plugins/maven-war-plugin/overlays.html" rel="nofollow">overlays</a>.</p> <h2>Sample solution</h2> <pre><code>* test-parent.pom * test-core (test-core.jar) - shared code * test-web-parent (test-web-parent.pom) - first project * core (test-web-core.jar) * web (test-web.war) * test-web-2-parent (test-web-2-parent.pom) - second project * core (test-web-2-core.jar) * web (test-web-2.war) </code></pre> <p><code>test-web.war</code> have dependencies:</p> <ul> <li>test-web-core.jar</li> <li>test-core.jar</li> </ul> <p><code>test-web-2.war</code> have dependencies:</p> <ul> <li>test-web-2-core.jar</li> <li>test-core.jar</li> </ul> <h1>Configuration</h1> <h2><code>test-parent.pom</code></h2> <pre><code>&lt;?xml version="1.0" encoding="UTF-8"?&gt; &lt;project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"&gt; &lt;modelVersion&gt;4.0.0&lt;/modelVersion&gt; &lt;groupId&gt;test-parent&lt;/groupId&gt; &lt;artifactId&gt;test-parent&lt;/artifactId&gt; &lt;packaging&gt;pom&lt;/packaging&gt; &lt;version&gt;1.0-SNAPSHOT&lt;/version&gt; &lt;modules&gt; &lt;module&gt;test-core&lt;/module&gt; &lt;module&gt;test-web-parent&lt;/module&gt; &lt;module&gt;test-web-2-parent&lt;/module&gt; &lt;/modules&gt; &lt;/project&gt; </code></pre> <h2><code>test-core.jar</code></h2> <pre><code>&lt;?xml version="1.0" encoding="UTF-8"?&gt; &lt;project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"&gt; &lt;parent&gt; &lt;groupId&gt;test-parent&lt;/groupId&gt; &lt;artifactId&gt;test-parent&lt;/artifactId&gt; &lt;version&gt;1.0-SNAPSHOT&lt;/version&gt; &lt;/parent&gt; &lt;modelVersion&gt;4.0.0&lt;/modelVersion&gt; &lt;artifactId&gt;test-core&lt;/artifactId&gt; &lt;/project&gt; </code></pre> <h2><code>test-web-parent.pom</code></h2> <pre><code>&lt;?xml version="1.0" encoding="UTF-8"?&gt; &lt;project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"&gt; &lt;parent&gt; &lt;groupId&gt;test-parent&lt;/groupId&gt; &lt;artifactId&gt;test-parent&lt;/artifactId&gt; &lt;version&gt;1.0-SNAPSHOT&lt;/version&gt; &lt;/parent&gt; &lt;modelVersion&gt;4.0.0&lt;/modelVersion&gt; &lt;artifactId&gt;test-web-parent&lt;/artifactId&gt; &lt;packaging&gt;pom&lt;/packaging&gt; &lt;modules&gt; &lt;module&gt;core&lt;/module&gt; &lt;module&gt;web&lt;/module&gt; &lt;/modules&gt; &lt;/project&gt; </code></pre> <h2><code>test-web-core.jar</code></h2> <pre><code>&lt;?xml version="1.0" encoding="UTF-8"?&gt; &lt;project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"&gt; &lt;parent&gt; &lt;groupId&gt;test-parent&lt;/groupId&gt; &lt;artifactId&gt;test-web-parent&lt;/artifactId&gt; &lt;version&gt;1.0-SNAPSHOT&lt;/version&gt; &lt;/parent&gt; &lt;modelVersion&gt;4.0.0&lt;/modelVersion&gt; &lt;artifactId&gt;test-web-core&lt;/artifactId&gt; &lt;dependencies&gt; &lt;dependency&gt; &lt;groupId&gt;test-parent&lt;/groupId&gt; &lt;artifactId&gt;test-core&lt;/artifactId&gt; &lt;version&gt;1.0-SNAPSHOT&lt;/version&gt; &lt;/dependency&gt; &lt;/dependencies&gt; &lt;/project&gt; </code></pre> <h2><code>test-web.war</code></h2> <pre><code>&lt;?xml version="1.0" encoding="UTF-8"?&gt; &lt;project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"&gt; &lt;parent&gt; &lt;groupId&gt;test-parent&lt;/groupId&gt; &lt;artifactId&gt;test-web-parent&lt;/artifactId&gt; &lt;version&gt;1.0-SNAPSHOT&lt;/version&gt; &lt;/parent&gt; &lt;modelVersion&gt;4.0.0&lt;/modelVersion&gt; &lt;artifactId&gt;test-web&lt;/artifactId&gt; &lt;packaging&gt;war&lt;/packaging&gt; &lt;dependencies&gt; &lt;dependency&gt; &lt;groupId&gt;test-parent&lt;/groupId&gt; &lt;artifactId&gt;test-web-core&lt;/artifactId&gt; &lt;version&gt;1.0-SNAPSHOT&lt;/version&gt; &lt;type&gt;jar&lt;/type&gt; &lt;/dependency&gt; &lt;/dependencies&gt; &lt;/project&gt; </code></pre> <h2><code>test-web-2-parent.pom</code></h2> <pre><code>&lt;?xml version="1.0" encoding="UTF-8"?&gt; &lt;project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"&gt; &lt;parent&gt; &lt;groupId&gt;test-parent&lt;/groupId&gt; &lt;artifactId&gt;test-parent&lt;/artifactId&gt; &lt;version&gt;1.0-SNAPSHOT&lt;/version&gt; &lt;/parent&gt; &lt;modelVersion&gt;4.0.0&lt;/modelVersion&gt; &lt;artifactId&gt;test-web-2-parent&lt;/artifactId&gt; &lt;packaging&gt;pom&lt;/packaging&gt; &lt;modules&gt; &lt;module&gt;core&lt;/module&gt; &lt;module&gt;web&lt;/module&gt; &lt;/modules&gt; &lt;/project&gt; </code></pre> <h2><code>test-web-2-core.jar</code></h2> <pre><code>&lt;?xml version="1.0" encoding="UTF-8"?&gt; &lt;project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"&gt; &lt;parent&gt; &lt;groupId&gt;test-parent&lt;/groupId&gt; &lt;artifactId&gt;test-web-2-parent&lt;/artifactId&gt; &lt;version&gt;1.0-SNAPSHOT&lt;/version&gt; &lt;/parent&gt; &lt;modelVersion&gt;4.0.0&lt;/modelVersion&gt; &lt;artifactId&gt;test-web-2-core&lt;/artifactId&gt; &lt;dependencies&gt; &lt;dependency&gt; &lt;groupId&gt;test-parent&lt;/groupId&gt; &lt;artifactId&gt;test-core&lt;/artifactId&gt; &lt;version&gt;1.0-SNAPSHOT&lt;/version&gt; &lt;/dependency&gt; &lt;/dependencies&gt; &lt;/project&gt; </code></pre> <h2><code>test-web-2.war</code></h2> <pre><code>&lt;?xml version="1.0" encoding="UTF-8"?&gt; &lt;project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"&gt; &lt;parent&gt; &lt;groupId&gt;test-parent&lt;/groupId&gt; &lt;artifactId&gt;test-web-2-parent&lt;/artifactId&gt; &lt;version&gt;1.0-SNAPSHOT&lt;/version&gt; &lt;/parent&gt; &lt;modelVersion&gt;4.0.0&lt;/modelVersion&gt; &lt;artifactId&gt;test-web-2&lt;/artifactId&gt; &lt;packaging&gt;war&lt;/packaging&gt; &lt;dependencies&gt; &lt;dependency&gt; &lt;groupId&gt;test-parent&lt;/groupId&gt; &lt;artifactId&gt;test-web-2-core&lt;/artifactId&gt; &lt;version&gt;1.0-SNAPSHOT&lt;/version&gt; &lt;/dependency&gt; &lt;!--first war--&gt; &lt;dependency&gt; &lt;groupId&gt;test-parent&lt;/groupId&gt; &lt;artifactId&gt;test-web&lt;/artifactId&gt; &lt;version&gt;1.0-SNAPSHOT&lt;/version&gt; &lt;scope&gt;runtime&lt;/scope&gt; &lt;type&gt;war&lt;/type&gt; &lt;/dependency&gt; &lt;dependency&gt; &lt;groupId&gt;test-parent&lt;/groupId&gt; &lt;artifactId&gt;test-web-core&lt;/artifactId&gt; &lt;version&gt;1.0-SNAPSHOT&lt;/version&gt; &lt;/dependency&gt; &lt;/dependencies&gt; &lt;/project&gt; </code></pre> <h2>Source code</h2> <ul> <li><a href="https://github.com/mariuszs/stackoverflow-war-bounty" rel="nofollow">https://github.com/mariuszs/stackoverflow-war-bounty</a></li> </ul>
 

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