Programmatically compiling Xtend classes is not working

Question

I am currently trying to compile programmatically generated Xtend classes. This is all part of an Eclipse plugin. This is what I do:

Adding the Xtend dependencies programmatically to the target project (works).
Creating programmatically some Xtend classes in the project with IProject.getFolder(), IFolder.getFile() and IFile.create() (JDT API).
Resfreshing the whole project with IProject.refreshLocal(IResource.DEPTH_INFINITE, new NullProgressMonitor());
Compiling the project with IProject.build(IncrementalProjectBuilder.FULL_BUILD, new NullProgressMonitor());

Now, as a result, I can see the generated classes in the Eclipse IDE. The problem is, there are no generated Java classes for the Xtend classes in the xtend-gen folder.

When I now open one of the generated Xtend classes manually in the Eclipse IDE, it will trigger the compilation. Now I can see the generated Java classes for the Xtend classes.

But I need to do that programmatically. Without opening one Xtend class manually. How can I do that? What is the problem here? Why am I not triggering the Xtend compilation?

score 1 · Accepted Answer · answered Aug 06 '17 at 11:02

Seems like I did not update the project description correctly. The Xtext builder was not set.

This how I do that now:

private static void updateProjectDescription(IProject project) {
    String builderName = "org.eclipse.xtext.ui.shared.xtextBuilder";
    String xtextNature = "org.eclipse.xtext.ui.shared.xtextNature";
    IProjectDescription description = null;
    try {
        description = project.getDescription();
    } catch (CoreException exception) {
        exception.printStackTrace();
    }
    // add xtext builder:
    ICommand[] commands = description.getBuildSpec();
    ICommand command = description.newCommand();
    command.setBuilderName(builderName);
    if (Arrays.asList(commands).contains(command)) {
        logger.warn(".project already contains " + builderName);
    } else {
        ICommand[] newCommands = new ICommand[commands.length + 1];
        System.arraycopy(commands, 0, newCommands, 0, commands.length);
        newCommands[commands.length] = command;
        description.setBuildSpec(newCommands);
    }
    // Add xtext nature:
    String[] natures = description.getNatureIds();
    if (Arrays.asList(natures).contains(xtextNature)) {
        logger.warn(".project already contains " + xtextNature);
    } else {
        String[] newNatures = new String[natures.length + 1];
        System.arraycopy(natures, 0, newNatures, 0, natures.length);
        newNatures[natures.length] = xtextNature;
        description.setNatureIds(newNatures);
    }
    try {
        project.setDescription(description, new ProgressMonitorAdapter(logger));
    } catch (CoreException exception) {
        logger.fatal(exception);
    }
}

Programmatically compiling Xtend classes is not working

1 Answers1