java - 测试时为类提供了错误类型的 id

Question

我在测试时遇到了这个问题-为类 com.myapp.ibank.domain.Customer 提供了错误类型的 ID。预期:类 java.lang.Long，得到类 java.lang.String

老实说，我不明白为什么我会得到这个以及实际发生了什么。当我正常使用它时，比如在本地tomcat上运行并通过 Controller 保存它然后服务，它工作得很好。没有错误。这种行为对我来说毫无意义。

我使用 JPA 2.1 和 Hibernate 作为提供者。

测试代码如下:

@RunWith(SpringJUnit4ClassRunner.class)
@WebAppConfiguration
@ContextHierarchy({
        @ContextConfiguration(classes = RootConfig.class),
        @ContextConfiguration(classes = WebConfig.class)

})
@Transactional
public class AccountRepositoryTest {

    @Autowired
    private WebApplicationContext wac;
    @Autowired
    private AccountRepository accountRepository;
    @Autowired
    private CustomerService customerService;

    private MockMvc mockMvc;

    @Before
    public void setup() {
        this.mockMvc = MockMvcBuilders.webAppContextSetup(this.wac).build();

        Customer cus = new Customer();
        cus.setFirstName("John");
        cus.setLastName("Smith");
        customerService.save(cus);
    }

    @Test
    public void testSaveAccount() {

        Account account = new Account();
        account.setCustomer(customerService.findByName("John"));
        account.setName();
        account.setDebitCard(new DebitCard((long) 2000));

        accountRepository.create(account);
    }

    @Test
    public void testSavePremiumAccount() {

        PremiumAccount premAccount = new PremiumAccount();
        premAccount.setCustomer(customerService.findByName("John"));
        premAccount.setName();
        premAccount.setDebitCard(new DebitCard((long) 6000));
        premAccount.setCreditCard(new CreditCard((long) 12000));

        accountRepository.create(premAccount);
    }

}

我的客户实体(简短版):

@Entity
@DynamicUpdate
@Table(name = "customer")
public class Customer implements Serializable {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;
    private String firstName;
    private String lastName;
    @OneToMany(cascade = CascadeType.ALL, fetch = FetchType.EAGER, mappedBy = "customer")
    //@JoinColumn(name="account_id", referencedColumnName="id")
    @Nullable
    @JsonManagedReference
    private List<Account> Accounts = new ArrayList<Account>();
    //private Address Address;


    public Customer() {
    }

    public Customer(String firstName, String lastName,  List<Account> accounts) {
        this.firstName = firstName;
        this.lastName = lastName;
        this.Accounts = accounts;
    }

还有我的仓库:

@Repository("customerRepository")
public class CustomerRepositoryImpl implements CustomerRepository {

    @PersistenceContext
    private EntityManager em;


    @Override
    @Transactional
    @NotNull
    public void save(Customer customer) {
        em.persist(customer);
        em.flush();
    }

    @Override
    public Customer findByName(String Name) {
    return em.find(Customer.class, Name);
    }
}

我错过了什么，或者这是无法避免的 hibernate 的一般错误？我在某处读到这是一个典型的错误。

完整堆栈跟踪:

org.springframework.dao.InvalidDataAccessApiUsageException: Provided id of the wrong type for class com.ruruapps.ibank.domain.Customer. Expected: class java.lang.Long, got class java.lang.String; nested exception is java.lang.IllegalArgumentException: Provided id of the wrong type for class com.ruruapps.ibank.domain.Customer. Expected: class java.lang.Long, got class java.lang.String
    at org.springframework.orm.jpa.EntityManagerFactoryUtils.convertJpaAccessExceptionIfPossible(EntityManagerFactoryUtils.java:381)
    at org.springframework.orm.jpa.vendor.HibernateJpaDialect.translateExceptionIfPossible(HibernateJpaDialect.java:157)
    at org.springframework.orm.jpa.AbstractEntityManagerFactoryBean.translateExceptionIfPossible(AbstractEntityManagerFactoryBean.java:417)
    at org.springframework.dao.support.ChainedPersistenceExceptionTranslator.translateExceptionIfPossible(ChainedPersistenceExceptionTranslator.java:59)
    at org.springframework.dao.support.DataAccessUtils.translateIfNecessary(DataAccessUtils.java:213)
    at org.springframework.dao.support.PersistenceExceptionTranslationInterceptor.invoke(PersistenceExceptionTranslationInterceptor.java:147)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
    at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:207)
    at com.sun.proxy.$Proxy45.findByName(Unknown Source)
    at com.ruruapps.ibank.service.CustomerServiceImpl.findByName(CustomerServiceImpl.java:40)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:317)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:190)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:157)
    at org.springframework.transaction.interceptor.TransactionInterceptor$1.proceedWithInvocation(TransactionInterceptor.java:98)
    at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:262)
    at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:95)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
    at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:207)
    at com.sun.proxy.$Proxy48.findByName(Unknown Source)
    at com.ruruapps.ibank.AccountRepositoryTest.testSaveAccount(AccountRepositoryTest.java:55)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:47)
    at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
    at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:44)
    at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
    at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26)
    at org.springframework.test.context.junit4.statements.RunBeforeTestMethodCallbacks.evaluate(RunBeforeTestMethodCallbacks.java:72)
    at org.springframework.test.context.junit4.statements.RunAfterTestMethodCallbacks.evaluate(RunAfterTestMethodCallbacks.java:81)
    at org.springframework.test.context.junit4.statements.SpringRepeat.evaluate(SpringRepeat.java:72)
    at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:271)
    at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:216)
    at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:82)
    at org.junit.runners.ParentRunner$3.run(ParentRunner.java:238)
    at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:63)
    at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:236)
    at org.junit.runners.ParentRunner.access$000(ParentRunner.java:53)
    at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:229)
    at org.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate(RunBeforeTestClassCallbacks.java:60)
    at org.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate(RunAfterTestClassCallbacks.java:67)
    at org.junit.runners.ParentRunner.run(ParentRunner.java:309)
    at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:162)
    at org.junit.runners.Suite.runChild(Suite.java:127)
    at org.junit.runners.Suite.runChild(Suite.java:26)
    at org.junit.runners.ParentRunner$3.run(ParentRunner.java:238)
    at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:63)
    at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:236)
    at org.junit.runners.ParentRunner.access$000(ParentRunner.java:53)
    at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:229)
    at org.junit.runners.ParentRunner.run(ParentRunner.java:309)
    at org.junit.runner.JUnitCore.run(JUnitCore.java:160)
    at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:78)
    at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:212)
    at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:68)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at com.intellij.rt.execution.application.AppMain.main(AppMain.java:140)
Caused by: java.lang.IllegalArgumentException: Provided id of the wrong type for class com.ruruapps.ibank.domain.Customer. Expected: class java.lang.Long, got class java.lang.String
    at org.hibernate.jpa.spi.AbstractEntityManagerImpl.find(AbstractEntityManagerImpl.java:1135)
    at org.hibernate.jpa.spi.AbstractEntityManagerImpl.find(AbstractEntityManagerImpl.java:1068)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at org.springframework.orm.jpa.SharedEntityManagerCreator$SharedEntityManagerInvocationHandler.invoke(SharedEntityManagerCreator.java:291)
    at com.sun.proxy.$Proxy44.find(Unknown Source)
    at com.ruruapps.ibank.repository.CustomerRepositoryImpl.findByName(CustomerRepositoryImpl.java:47)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:317)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:190)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:157)
    at org.springframework.dao.support.PersistenceExceptionTranslationInterceptor.invoke(PersistenceExceptionTranslationInterceptor.java:136)
    ... 59 more
Caused by: org.hibernate.TypeMismatchException: Provided id of the wrong type for class com.ruruapps.ibank.domain.Customer. Expected: class java.lang.Long, got class java.lang.String
    at org.hibernate.event.internal.DefaultLoadEventListener.onLoad(DefaultLoadEventListener.java:134)
    at org.hibernate.internal.SessionImpl.fireLoad(SessionImpl.java:1106)
    at org.hibernate.internal.SessionImpl.access$2000(SessionImpl.java:176)
    at org.hibernate.internal.SessionImpl$IdentifierLoadAccessImpl.load(SessionImpl.java:2587)
    at org.hibernate.internal.SessionImpl.get(SessionImpl.java:991)
    at org.hibernate.jpa.spi.AbstractEntityManagerImpl.find(AbstractEntityManagerImpl.java:1110)
    ... 75 more

客户服务实现例:

@Service("customerService")
@Transactional
public class CustomerServiceImpl implements CustomerService {

    @Autowired
    private CustomerRepository customerRepository;

    @Override
    public void save(Customer customer) {
        customerRepository.save(customer);
    }

    @Override
    public List<Customer> findAll() {
        return customerRepository.findAll();
    }

    @Override
    public Customer findById(Long id) {
        return customerRepository.findById(id);
    }

    @Override
    public Customer findByName(String Name) {
        return customerRepository.findByName(Name);
    }
}

Answer 1

你的方法定义为

return em.find(Customer.class, Name);

EntityManager.find() 获取实体的 ID，并返回具有该 ID 的实体。 Customer 的 ID 是一个 Long。这不是名字。您需要一个查询来实现 findByName()。