GWT. Maven. GWT Module <module_name> not found in project sources or resources

Question

I have a maven multi-module project. One of this modules (compiled as .jar) contains only domain objects, which will be used at client and server sides (I add this .jar as dependency to other my modules).

I know that GWT module, where will be used objects from shared .jar, must also have source files for successful compilation. So I tried to add to my pom.xml both:

        <resources> 
            <resource>
              <directory>src/main/java/<path></directory> 
              <includes> 
                <include>**/*.java</include> 
                <include>**/*.gwt.xml</include> 
              </includes> 
            </resource> 
        </resources>  

and

 <plugin>
    <groupId>org.codehaus.mojo</groupId>
    <artifactId>gwt-maven-plugin</artifactId>
    <versionRange>[${gwt.version}]</versionRange>
    <goals>
        <goal>resources</goal>
    </goals>
 <plugin>

But resulting .jar don't contain GWT module source (i.e gwt.xml). All sources of domain classes are added as well (at root directory of .jar), but ModuleName.gwt.xml not.

Where is problem? Thanks.

Answer 1

If your .gwt.xml file is in src/main/resources/ then it won't get copied if you specify src/main/java/ as the resource path...

You should probably omit the <resource> section and let the GWT plugin include the source in the jar or at least have two sections, one for the .gwt.xml file (src/main/resources or where you put it) and one for the source code (as you have it now).

Cheers,

Answer 2

I was troubleshooting this error today so I'm just posting my fix:

Multi-module gwt project being build with the maven gwt plugin needs an entry in the pom.xml like:

  <modules>
        <module>../theothermodule</module>
  </modules>

In order to compile.

Answer 3

This error have multiple explanations. Check list:

• if you are referencing a gwt module you need to point to the *.gwt.xml file in dot notation without the file extension. E.g. com.example.ThirdParty refers to com/example/ThirdParty.gwt.xml module
• to import the 3rd party module, add <inherits name="com.example.ThirdParty" /> to your *.gwt.xml file
• the ThirdParty.gwt.xml should contain one or more source elements pointing to translatable code. E.g. <source path='shared' />.
• all translatable code in ThirdParty.jar needs to include plaintext *.java sources. E.g. com/example/shared/Widget.class and com/example/shared/Widget.java are both present
• the ThirdParty.jar is on your classpath

Notes:

• if the ThirdParty gwt module does not have entry point it does not need to be compiled with gwt compiler
• the gwt compiler does not require extra configuration to include the ThirdParty module as long as its jar is on classpath and your *.gwt.xml inherits ThirdParty.gwt.xml; the same applies to the gwt maven plugin