当Java方法在实体模型后第二次调用时的NPE

为了测试服务，我想实施JUnit 5测试：

JPA存储库：

服务实施：

测试服务：

因此，当我使用

BDDMockito.given…

模拟SQL查询

riskFilterService.findriskFiltersByTerminalidType…

运行代码时，第一次运行的情况很好。 但是在第二次运行

binCountryCheckFilterImpl.validateBinCountryCheckFilter（）之后我获得代码的NPE
riskFilterService.FindriskFiltersByTerminalidType….

你知道我如何解决这个问题吗？
很可能测试对象没有使用模拟。由于没有分配依赖项，因此会得到一个NPE

为什么不像使用终端一样，通过构造函数注入将其显式注入到主题中呢

@Service
public class BinCountryCheckFilterImpl {

    private RiskFilterService riskFilterService;
    private Terminals terminal;

    @Autowired
    public BinCountryCheckFilterImpl(Terminals terminal, RiskFilterService riskFilterService) {  
        this.terminal = terminal;
        this.riskFilterService = riskFilterService;
    }

    public void validateBinCountryCheckFilter() throws JAXBException, JsonProcessingException {

        List<RiskFilters> filter_list = riskFilterService.findRiskFiltersByTerminalIdAndType(terminal.getId(), "BinCountryCheckFilter");
    }
}

我不确定BDDMockito是否正确，但在某些框架中，您需要分别模拟连续调用的结果：
.willReturn（riskFiltersList）。willReturn（riskFiltersList）
。很可能测试对象没有使用模拟。由于没有分配依赖项，因此会得到一个NPE。为什么不像终端那样显式地将其注入到主体中呢？模拟在哪里？您在测试中从何处获得riskFilterService？为什么不通过构造函数注入依赖项？事实上，@Nkosi说的。。。其中是
BinCountryCheckFilterImpl-BinCountryCheckFilterImpl=newbincountrycheckfilterimpl（终端）中的
terminal
已定义？@ZeroOne Terminal它只是一个Java对象。它正在工作，但有一种方法我不想将
RiskFilterService
作为构造函数的参数发送，以保持服务的设计干净。还有其他方法吗？@PeterPenzov你怎么能提供你不能注射它们的模拟？好问题-我不知道。其他想法？
public interface RiskFilterService {
    ......
}

@Service
@Qualifier("riskFilterService")
@Transactional
public class RiskFilterServiceImpl implements RiskFilterService {

    @PersistenceContext
    private EntityManager entityManager;

    @Autowired
    private RiskFilterRepository dao;
    ...
}

@Service
public class BinCountryCheckFilterImpl {

    @Autowired
    @Qualifier("riskFilterService")
    private RiskFilterService riskFilterService;

    public BinCountryCheckFilterImpl(Terminals terminal) {  
       this.terminal = terminal;
    }

    public void validateBinCountryCheckFilter() throws JAXBException, JsonProcessingException {

        List<RiskFilters> filter_list = riskFilterService.findRiskFiltersByTerminalIdAndType(terminal.getId(), "BinCountryCheckFilter");
    }
}

    public class BinCountryCheckFilterImplTest    {

        @Autowired
        private RiskFilterRepository repository;

        @BeforeEach
        public void beforeEachTest() throws IOException {
            MockitoAnnotations.initMocks(this); 
        }

        @Test
        public void testBinCountryCheckFilterImpl() throws JsonProcessingException, JAXBException {
           // this mock is working fine
           BDDMockito.given(riskFilterService.findRiskFiltersByTerminalIdAndType(anyInt(), anyString())).willReturn(riskFiltersList);

           // this mock is working fine - I don't get NPE
           List<RiskFilters> filter_list = riskFilterService.findRiskFiltersByTerminalIdAndType(11, "BinCountryCheckFilter");

           // this mock is working fine
           BinCountryCheckFilterImpl binCountryCheckFilterImpl = new BinCountryCheckFilterImpl(terminal);

           // I get NPE here 
           binCountryCheckFilterImpl.validateBinCountryCheckFilter();
        }    
    }

List<RiskFilters> filter_list = riskFilterService.findRiskFiltersByTerminalIdAndType(11, "BinCountryCheckFilter");

@Service
public class BinCountryCheckFilterImpl {

    private RiskFilterService riskFilterService;
    private Terminals terminal;

    @Autowired
    public BinCountryCheckFilterImpl(Terminals terminal, RiskFilterService riskFilterService) {  
        this.terminal = terminal;
        this.riskFilterService = riskFilterService;
    }

    public void validateBinCountryCheckFilter() throws JAXBException, JsonProcessingException {

        List<RiskFilters> filter_list = riskFilterService.findRiskFiltersByTerminalIdAndType(terminal.getId(), "BinCountryCheckFilter");
    }
}

public class BinCountryCheckFilterImplTest    {

    @Test
    public void testBinCountryCheckFilterImpl() throws JsonProcessingException, JAXBException {
        //Arrange
        RiskFilterService riskFilterService = Mockito.mock(RiskFilterService.class);
        Terminals terminal = Mockito.mock(Terminals.class);

        BDDMockito.given(
            riskFilterService.findRiskFiltersByTerminalIdAndType(anyInt(), anyString()))
            .willReturn(riskFiltersList);

        int expectedInt = 11;
        String expectedString = "BinCountryCheckFilter";

        when(terminal.getId()).thenReturn(expectedInt);

        BinCountryCheckFilterImpl binCountryCheckFilterImpl = 
            new BinCountryCheckFilterImpl(terminal, riskFilterService);

        //Act
        binCountryCheckFilterImpl.validateBinCountryCheckFilter();

        //Assert
        then(riskFilterService)
          .should()
          .findRiskFiltersByTerminalIdAndType(expectedInt, expectedString);
    }    
}