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Asked: 2026-05-10T16:46:41+00:00

I would like to add a BuildListener to my headless build process, which is

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I would like to add a BuildListener to my headless build process, which is building an Eclipse product. The docs on how to do this are, shall we say, a bit scanty. I think I need to put my custom jar in a plugin and then use the org.eclipse.ant.core.extraClasspathEntries extension point to make that jar visible to Ant. But everything I have tried results in 

 [myClass] which was specified to be a build listener is not an instance of org.apache.tools.ant.BuildListener.

My class implements the BuildListener interface. Various postings seem to indicate that this means my class is visible-to/loaded-by the Plugin classloader rather than the Ant classloader. But I thought the whole point of the extension point was to make jars visible to Ant…

Can anyone shed light on what I’m doing wrong? Additional info: I am trying to run this build from the Eclipse IDE at the moment using the AntRunner application.

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1 Answer

  1. I had this problem when I had two plugins providing an ant.jar.

    Make sure you use the org.apache.ant plugin and that there is no other plugin providing another ant.jar.

    Another thing I just stumbled upon: The jar containing your contribution must not be in the plugins classpath (Runtime -> Classpath).

    See Eclipse Bug 34466.

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