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    <p>I 'll reply to your second question first, as it is not GWT specific. Considering your project is structured this way :</p> <pre><code>project-root |- module1 (jar) |- module2 (jar) L moduleMain (gwt + war) </code></pre> <p>If you make some changes in <code>module2</code>, and do not want to recompile <code>module1</code>, you can use the option <code>-pl</code> to skip it from the build process (command to launch from the <code>project-root</code> folder):</p> <pre><code>mvn clean install -pl module2,moduleMain </code></pre> <p>This will recompile <code>module2</code>, and then <code>moduleMain</code>, without recompiling <code>module1</code>.</p> <p><strong>Will this help us in Improving the compilation time ?</strong></p> <p>It depends how big are <code>module1</code> and <code>module2</code> compared to <code>moduleMain</code>... But my experience with GWT is that a lot of time is generally spent to compile the java client code into javascript. This operation still occurs in your <code>moduleMain</code>, so I would say that splitting your project into several modules won't be enough to improve the compilation time significantly.</p> <p>In addition, I advise you to use a profile that will control the activation/deactivation of the <code>gwt-maven-plugin</code> within <code>moduleMain</code>.</p> <p>In the <code>moduleMain</code>'s pom.xml, move the GWT plugin into a profile, this way :</p> <pre><code>&lt;profiles&gt; &lt;profile&gt; &lt;id&gt;GWTBuild&lt;/id&gt; &lt;activation&gt; &lt;activeByDefault&gt;true&lt;/activeByDefault&gt; &lt;/activation&gt; &lt;build&gt; &lt;plugins&gt; &lt;plugin&gt; &lt;groupId&gt;org.codehaus.mojo&lt;/groupId&gt; &lt;artifactId&gt;gwt-maven-plugin&lt;/artifactId&gt; &lt;version&gt;2.4.0&lt;/version&gt; &lt;executions&gt; &lt;execution&gt; &lt;goals&gt; &lt;goal&gt;compile&lt;/goal&gt; &lt;goal&gt;generateAsync&lt;/goal&gt; &lt;goal&gt;test&lt;/goal&gt; &lt;/goals&gt; &lt;/execution&gt; &lt;/executions&gt; &lt;configuration&gt; &lt;runTarget&gt;com.yoururlroot/index.html&lt;/runTarget&gt; &lt;/configuration&gt; &lt;/plugin&gt; &lt;/plugins&gt; &lt;/build&gt; &lt;/profile&gt; &lt;/profiles&gt; </code></pre> <p>Then, if you just want to rebuild your war because <code>module2</code> has changed BUT whithout rebuilding <code>module1</code> AND whithout recompiling all the GWT stuff, simply launch :</p> <pre><code>mvn clean install -pl module2,moduleMain -P!GWTBuild </code></pre> <p>In this command, the GWT plugin is deactivated, so maven will only rebuild the war.</p> <p>Tell me if this is working for you.</p>
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    1. POGWT Compilation Time Performance Improvement
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    1. COPlease conside the case like this way : ModuleMain inherits module 1 and module 2. ModuleMain contains the main entry point class. Module 1 and Module 2 are just JAR with .gwt.xml file which are having no entry points. So Lets say IF I change Module1 then I need to make the JAR and install the same in Local repository using Maven. Then I will build the WAR for ModuleMain as this will generate the final WAR for me. In this case will Module 2 compile again ? Or not? Compile means not Java to Javac but Java to Javascript...I hope this clears my question a bit.
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      1. USNiraj Salot
    2. CO"Please... generate the final WAR for me" => It was exactly my understanding. "In this case will Module 2 compile again ?" => no... if you follow what I explained in my post. But I don't understand your assertion "Compile means not Java to Javac but Java to Javascript"... Module2 does not contain code that is expected to be compiled in JS... Or maybe I didn't understand anything to your pb :)...
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    3. COBoth Module 1 and Module 2 contain code which needs to be compiled in JS.
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      1. USNiraj Salot
 

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