Description Frank Schwarz 2016-03-03 09:11:38 EST

Please allow adding "extraClasspathElements" at the beginning of the BundleProject's classpath within the tycho-compiler-plugin.

Currently the "extraClasspathElements" are added at the end of the classpath:

https://github.com/eclipse/tycho/blob/master/tycho-compiler-plugin/src/main/java/org/eclipse/tycho/compiler/AbstractOsgiCompilerMojo.java#L653

Kindly seeking to support this use-case:

I have two bundles "basemodel" and "productmodel". Both bundles shall be treated with EclipseLink's static-weaving processor to alter the contained JPA model classes. When weaving the "basemodel" classes, EclipseLink will insert some abstract methods into abstract entity classes.

Next, when compiling "productmodel" against "basemodel", the compilation will fail as derived classes do not yet implement the additional methods introduced by the EclipseLink weaver. (This would only happen next when weaving this bundle, too).

The idea is to compile against the unaltered classes of "basemodel":

<plugin>
  <groupId>org.eclipse.tycho</groupId>
  <artifactId>tycho-compiler-plugin</artifactId>
  <configuration>
    <extraClasspathElements>
      <dependency>
        <groupId>com.acme</groupId>
        <artifactId>basemodel</artifactId>
        <version>${project.version}</version>
        <type>jar</type>
        <classifier>pristine</classifier>
      </dependency>
    </extraClasspathElements>
  </configuration>
</plugin>

Unfortunately, this does not work as the extraClasspathElements are added at the end of the existing classpath. I would rather need a mechanism to "shadow" the bundle-project's real classpath.