Initialize local datastore exception : No API environment is registered for this thread

Question

I would like to initialize my local data store with some data using a regular Java program (I do not want to start the Development Server and call a service/servlet), and I\

Answer 1

Google provides a helper class that does exactly what you want - runs just enough code to work with the database, without launching the whole dev server. See the setUp and tearDown methods at http://code.google.com/appengine/docs/java/tools/localunittesting.html

Answer 2

You have to setup a test Datastore Service for current thread. Basically you can do this:

private static void testServerCallBack() {
    LocalServiceTestHelper helper =
        new LocalServiceTestHelper(new LocalDatastoreServiceTestConfig());
    helper.setUp();
    Contacts contacts = new Contacts("this is", "awesome");
    greetingServiceImpl.saveContact(contacts);//line:14
}

That will initialize Database Service (a fake, for testing only) for this method only.

Or better you can do:

private final LocalServiceTestHelper helper =
  new LocalServiceTestHelper(new LocalDatastoreServiceTestConfig());

@Before
public void setUp() {
   helper.setUp();
}

@After
public void tearDown() {
   helper.tearDown();
}

So Database Service will work from all test methods.

Notice that if you're using different threads to access db, then you'll get a separate database for each thread. That's not what you want most likely. I mean helper.setUp() do setup a new separate Database Service for current thread, and all data stored into this db will be accessible only from current thread.

See more details at: http://code.google.com/appengine/docs/java/tools/localunittesting.html

Answer 3

Just add those 3 libs (appart of the test one) to your classpath:

${SDK_ROOT}/lib/impl/appengine-api.jar
${SDK_ROOT}/lib/impl/appengine-api-labs.jar
${SDK_ROOT}/lib/impl/appengine-api-stubs.jar

This should fix the problem.