#vulnerable code 
                              public void testCompleteOrRetry() {
    // Given retry on IllegalArgumentException
    exec = new AsyncExecution(callable, scheduler, future, configFor(new RetryPolicy()));

    // When / Then
    exec.completeOrRetry(null, e);
    assertFalse(exec.isComplete());
    exec.before();
    exec.completeOrRetry(null, null);

    // Then
    assertEquals(exec.getExecutions(), 2);
    assertTrue(exec.isComplete());
    assertNull(exec.getLastResult());
    assertNull(exec.getLastFailure());
    verifyScheduler(1);
    verify(future).complete(null, null, null);
  } 
                            #location 8 
                            #vulnerability type NULL_DEREFERENCE
#fixed code
                              public void testCompleteOrRetry() {
    // Given retry on IllegalArgumentException
    exec = new AsyncExecution(callable, scheduler, future, configFor(new RetryPolicy()));

    // When / Then
    exec.completeOrRetry(null, e);
    assertFalse(exec.isComplete());
    exec.before();
    exec.completeOrRetry(null, null);

    // Then
    assertEquals(exec.getExecutions(), 2);
    assertTrue(exec.isComplete());
    assertNull(exec.getLastResult());
    assertNull(exec.getLastFailure());
    verifyScheduler(1);
    verify(future).complete(null, null, null, true);
  }