Program: 33963
Project: 33963
Buggy source:
public void run(final CompletionCallback completionCallback){
  this.messagingConnector.addMessageHandler(projectResponseHandler);
  this.messagingConnector.addMessageHandler(resourceResponseHandler);
  this.completionCallback=completionCallback;
  IWorkspaceRoot root=ResourcesPlugin.getWorkspace().getRoot();
  project=root.getProject(projectName);
  WorkspaceJob job=new WorkspaceJob("String_Node_Str"){
    @Override public IStatus runInWorkspace(    IProgressMonitor monitor) throws CoreException {
      try {
        if (!project.exists()) {
          project.create(monitor);
        }
        if (!project.isOpen()) {
          project.open(null);
        }
        JSONObject message=new JSONObject();
        message.put("String_Node_Str",callbackID);
        message.put("String_Node_Str",username);
        message.put("String_Node_Str",projectName);
        messagingConnector.send("String_Node_Str",message);
      }
 catch (      CoreException e1) {
        e1.printStackTrace();
        messagingConnector.removeMessageHandler(projectResponseHandler);
        messagingConnector.removeMessageHandler(resourceResponseHandler);
        completionCallback.downloadFailed();
      }
catch (      JSONException e) {
        e.printStackTrace();
        messagingConnector.removeMessageHandler(projectResponseHandler);
        messagingConnector.removeMessageHandler(resourceResponseHandler);
        completionCallback.downloadFailed();
      }
      return Status.OK_STATUS;
    }
  }
;
  job.setRule(ResourcesPlugin.getWorkspace().getRuleFactory().createRule(project));
  job.schedule();
}

Fixed version (ground truth):
public void run(final CompletionCallback completionCallback){
  this.messagingConnector.addMessageHandler(projectResponseHandler);
  this.messagingConnector.addMessageHandler(resourceResponseHandler);
  this.completionCallback=completionCallback;
  IWorkspaceRoot root=ResourcesPlugin.getWorkspace().getRoot();
  project=root.getProject(projectName);
  WorkspaceJob job=new WorkspaceJob("String_Node_Str"){
    @Override public IStatus runInWorkspace(    IProgressMonitor monitor) throws CoreException {
      try {
        if (!project.exists()) {
          project.create(monitor);
        }
        if (!project.isOpen()) {
          project.open(monitor);
        }
        JSONObject message=new JSONObject();
        message.put("String_Node_Str",callbackID);
        message.put("String_Node_Str",username);
        message.put("String_Node_Str",projectName);
        messagingConnector.send("String_Node_Str",message);
      }
 catch (      CoreException e1) {
        e1.printStackTrace();
        messagingConnector.removeMessageHandler(projectResponseHandler);
        messagingConnector.removeMessageHandler(resourceResponseHandler);
        completionCallback.downloadFailed();
      }
catch (      JSONException e) {
        e.printStackTrace();
        messagingConnector.removeMessageHandler(projectResponseHandler);
        messagingConnector.removeMessageHandler(resourceResponseHandler);
        completionCallback.downloadFailed();
      }
      return Status.OK_STATUS;
    }
  }
;
  job.setRule(ResourcesPlugin.getWorkspace().getRuleFactory().createRule(project));
  job.schedule();
}