Program: 120867
Project: 120867
Buggy source:
private void initializeJetEmittersProject(final IProgressMonitor progressMonitor) throws CoreException {
  Display.getDefault().syncExec(new Runnable(){
    @Override public void run(){
      try {
        final IWorkspace workspace=ResourcesPlugin.getWorkspace();
        IProject project=workspace.getRoot().getProject(JET_PROJECT);
        progressMonitor.subTask(CodeGenPlugin.getPlugin().getString("String_Node_Str",new Object[]{project.getName()}));
        File file=new File(workspace.getRoot().getLocation().append(JET_PROJECT).toPortableString());
        if (file.exists() && !project.isAccessible()) {
          progressMonitor.subTask("String_Node_Str" + project.getName());
          project.create(new SubProgressMonitor(progressMonitor,1));
          progressMonitor.subTask(CodeGenPlugin.getPlugin().getString("String_Node_Str",new Object[]{project.getName()}));
        }
 else         if (!project.isAccessible()) {
          project.delete(true,progressMonitor);
        }
        if (!project.exists()) {
          progressMonitor.subTask("String_Node_Str" + project.getName());
          project.create(new SubProgressMonitor(progressMonitor,1));
          progressMonitor.subTask(CodeGenPlugin.getPlugin().getString("String_Node_Str",new Object[]{project.getName()}));
        }
        if (!project.isOpen()) {
          project.open(new SubProgressMonitor(progressMonitor,5));
          project.refreshLocal(IResource.DEPTH_INFINITE,new SubProgressMonitor(progressMonitor,1));
        }
        IProjectDescription description=project.getDescription();
        if (!ArrayUtils.contains(description.getNatureIds(),JavaCore.NATURE_ID)) {
          description.setNatureIds(new String[]{JavaCore.NATURE_ID});
          project.setDescription(description,new SubProgressMonitor(progressMonitor,1));
        }
      }
 catch (      CoreException e) {
        e.printStackTrace();
      }
    }
  }
);
}

Fixed version (ground truth):
private void initializeJetEmittersProject(final IProgressMonitor progressMonitor) throws CoreException {
  final IWorkspace workspace=ResourcesPlugin.getWorkspace();
  IProject project=workspace.getRoot().getProject(JET_PROJECT);
  progressMonitor.subTask(CodeGenPlugin.getPlugin().getString("String_Node_Str",new Object[]{project.getName()}));
  File file=new File(workspace.getRoot().getLocation().append(JET_PROJECT).toPortableString());
  if (file.exists() && !project.isAccessible()) {
    progressMonitor.subTask("String_Node_Str" + project.getName());
    project.create(new SubProgressMonitor(progressMonitor,1));
    progressMonitor.subTask(CodeGenPlugin.getPlugin().getString("String_Node_Str",new Object[]{project.getName()}));
  }
 else   if (!project.isAccessible()) {
    project.delete(true,progressMonitor);
  }
  if (!project.exists()) {
    progressMonitor.subTask("String_Node_Str" + project.getName());
    project.create(new SubProgressMonitor(progressMonitor,1));
    progressMonitor.subTask(CodeGenPlugin.getPlugin().getString("String_Node_Str",new Object[]{project.getName()}));
  }
  if (!project.isOpen()) {
    project.open(new SubProgressMonitor(progressMonitor,5));
    project.refreshLocal(IResource.DEPTH_INFINITE,new SubProgressMonitor(progressMonitor,1));
  }
  IProjectDescription description=project.getDescription();
  if (!ArrayUtils.contains(description.getNatureIds(),JavaCore.NATURE_ID)) {
    description.setNatureIds(new String[]{JavaCore.NATURE_ID});
    project.setDescription(description,new SubProgressMonitor(progressMonitor,1));
  }
}