How to compile only changed parts of gwt modules? - eclipse

Question

We decided to use gwt modules in our application about 1 week ago. We use gwt-maven-eclipse trio and we already configured phases and goals. Also we are doing context deploying to decrease development and testing time.
BUT;
When we package or tomcat:deploy our application, gwt modules are re-compiling(including unchanged ones).
<set-property name="user.agent" value="gecko1_8"></set-property>
<extend-property name="locale" values="en_UK"></extend-property>
I already set these properties up here to speed up compiling time but this is not what i want exactly...
I also configured maven lifecycle mapping in eclipse to fire gwt:compile process-resources resources:testResources when any resources change. But it blocks eclipse and that was not helpful about compiling time either.
This is gwt-maven-plugin configuration in pom.xml
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>gwt-maven-plugin</artifactId>
<version>2.3.0</version>
<executions>
<execution>
<goals>
<goal>compile</goal>
</goals>
</execution>
</executions>
<!--
Plugin configuration. There are many available options, see
gwt-maven-plugin documentation at codehaus.org
-->
<configuration>
<runTarget>A.jsp</runTarget>
<runTarget>B.jsp</runTarget>
<hostedWebapp>${webappDirectory}</hostedWebapp>
</configuration>
</plugin>
Any idea to help me?

Answer 1

gwt-maven-plugin tries (hard) to avoid recompiling modules when the code hasn't changed, but even that takes a bit of time (still less than re-compiling the module; and unfortunately if it detects the module needs to be recompiled, it adds up to the GWT compile time).
If you know you don't need gwt:compile, you can pass -Dgwt.compiler.skip=true to your Maven build to skip the goal and keep "running" your previously compiled code. Similarly, if you know you need gwt:compile, you can pass -Dgwt.compiler.force=true to bypass the "up-to-date check".