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Where do you call that? Are you sure that your current user has the permission to call that function?

When you authenticate with that user, can you call getUserById from the browser (go to /api/jsonws and try to call that method).

I am calling that from within the Android App, as per the tutorial.  I'm not using a web browser any sort.  I'm not calling it as any particular user - as far as I can tell - it's using:

In the layout:

<com.liferay.mobile.screens.auth.login.LoginScreenlet
android:id="@+id/login_screenlet"
android:layout_width="match_parent"
android:layout_height="wrap_content"
liferay:basicAuthMethod="screen_name"
liferay:credentialsStorage="auto"
liferay:layoutId="@layout/login_westeros"
/>

And in the java:

protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    LoginScreenlet loginScreenlet = (LoginScreenlet) findViewById(R.id.login_screenlet);

    loginScreenlet.setListener(this);

}

@Override
public void onLoginSuccess(User user) {

    startActivity(new Intent(MainActivity.this, ActivityOne.class));

}

@Override
public void onLoginFailure(Exception e) {

    Toast.makeText( MainActivity.this,  "!!! LOGIN FAILURE !!!", Toast.LENGTH_SHORT).show();

}

THat's all straight from the tutorial.

After much searching and researching, it I tried adding the com.liferay.portal.kernal.service.UserService#getUserByScreenName to the System_Default in Configuration->Service Access Policy and no longer get the Access denied to com.liferay.portal.kernal.service.UserService#getUserByScreenName error.

Instead, I now get: User 20119 must have the VIEW permission to com.liferay.portal.kernel.model.User 20155.

Looking in users, I do see that Test user (the one I try to log in with) is 20155, however I cannot find 20119.  In fact, TEST is the ONLY user right now.

So it looks like there is definitely some permissioning issues going on.  I don't remember seeing any of this addressed in the tutorial I watched.  Is this addressed some place else? 

Anyone else have this issue?