#vulnerable code 
                             @Test
	public void findByIdTest() {
		TestEntity result = this.datastoreTemplate.findById(this.key1, TestEntity.class);
		assertThat(result).isEqualTo(this.ob1);
		assertThat(result.childEntities).contains(this.childEntity1);
		assertThat(this.childEntity1).isEqualTo(result.singularReference);
		assertThat(result.multipleReference).contains(this.childEntity1);
	} 
                            #location 5 
                            #vulnerability type NULL_DEREFERENCE
#fixed code
                             @Test
	public void findByIdTest() {
		verifyBeforeAndAfterEvents(null,
				new AfterFindByKeyEvent(Arrays.asList(this.ob1), Collections.singleton(this.key1)),
				() -> {
					TestEntity result = this.datastoreTemplate.findById(this.key1, TestEntity.class);
					assertThat(result).isEqualTo(this.ob1);
					assertThat(result.childEntities).contains(this.childEntity1);
					assertThat(this.childEntity1).isEqualTo(result.singularReference);
					assertThat(result.multipleReference).contains(this.childEntity1);
				}, x -> {
				});
	}