Jonathan Lalou's blog

Posts Tagged ‘did you forget to inherit a required module?’

Context

In a GWT application, you have to use RPC calls, using entities which are package in external jar archives. With Eclipse, no error appears ; yet when you build the project with Maven2, you get this message:

[INFO] [ERROR] Errors in 'file:/C:/eclipse/workspace/myGwtProject/src/java/com/lalou/jonathan/web/gwt/client/component/JonathanPanel.java'
(...)
[INFO]     [ERROR] Line 24: No source code is available for type com.lalou.jonathan.domain.MyEntity; did you forget to inherit a required module?
(...)
[INFO] Finding entry point classes

Fix

In related jar

In the project to which MyEntity belongs to (here: my/depended/project):

• create a file com/lalou/jonathan/MyDependedProject.gwt.xml, with as content:

  <module>
   <source path="">
   <include name="**/MyEntity.java"/>
   </source>
  </module>

• In the pom.xml:
  • Add the source MyEntity.java in built jar. This way, the Java file itself will be considered as a resource, like an XML or property file. To perform this, the quickest manner is to add the following block in the pom.xml:

    <resources>
    <resource>
    <directory>${basedir}/src/java</directory>
    <includes>
    <include>**/MyEntity.java</include>
    </includes>
    </resource>
    </resources>

  • Add an <include>**/*.gwt.xml</include> so that to have to MyDependedProject.gwt.xml file in the built jar.

  In GWT project

  In your *.gwt.xml file, add the dependency:

  <inherits name='com.lalou.jonathan.MyDependedProject' />

  Caution!

  All these operations need be done on all dependencies -either direct or indirect-. Therefore, possibly you may have a huge amount of code to be got.
  Another issue appears when you use a jar of which you do not have the source code, such as in the case of tiers API for instance.