Unable to find class _FieldSerializer

I have problems with testing GWT. I have an object (called DatabaseConnection), which I want to store in my test. For this I am using an asynchronous callback. Afterwards, I want to test some things about the object, but my test fails before it actually stores the object. I got the following exception:

java.lang.RuntimeException: Unable to find class DatabaseConnection_FieldSerializer

I have serval tests, which have to store the object to do the actual testing. When I execute each test by itselfs, everthing works fine. Also when I click through the frontend everything works. But when I try to execute all my GWT tests I got the error message above.

My tests are looking like this:

 public void testObject() {
    // Setup
    TestHelper.resetDatabaseSync();

    DatabaseConnection dbConnection = new DatabaseConnection();
    TestHelper.storeDatabaseConnection(dbConnection, new AsyncCallback<Long>() {
      @Override
      public void onFailure(Throwable caught) {
        // Here the test fails!
        System.out.println(caught.getMessage());
        fail();
      }

      @Override
      public void onSuccess(Long id) {
      }
    });
   
    Timer timer = new Timer() {
      @Override
      public void run() {
        // Do something with the object
        // For example creating a dropdown, which is automatically filled with all stored objects in the database
        // Validate something

        // Cleanup
        TestHelper.resetDatabaseSync();

        finishTest();
      }
    };

    delayTestFinish(8000);

    // Waiting for asynchronous calls to finish.
    timer.schedule(4000);
  }

I could not find any helpful solutions on the web. Does someone have an idea? It seems that my tests somehow depend on each other...

Thanks!

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