当 id 与正确的数据库行匹配时，JpaRepository findById 方法返回 Optional.empty？

Question

出于某种原因，我的 PluginRepository 接口不想 return 在此测试中保存在我的数据库中的对象。

@RunWith(SpringRunner.class)
@SpringBootTest(webEnvironment = SpringBootTest.WebEnvironment.RANDOM_PORT)
public class PluginServiceIntegrationTest {

@Autowired
private PluginRepository pluginRepository;

@Autowired
private PluginService pluginService;

@Autowired
private PluginController pluginController;

@LocalServerPort
private int port;

private String resourceUrl;

@Before
public void setUp() {
    resourceUrl = "http://localhost:" + port + "/plugin/";
}

@Test
public void notNullTest() {
    assertNotNull(pluginRepository);
    assertNotNull(pluginService);
    assertNotNull(pluginController);
}

@Test
public void postPluginTest() {
    RestTemplate restTemplate = new RestTemplate();

    PluginDTO requestDto = new PluginDTO();

    HttpEntity<PluginDTO> request = new HttpEntity<>(requestDto);
    ResponseEntity<PluginDTO> response = restTemplate.exchange(resourceUrl + "create", HttpMethod.POST, request, PluginDTO.class);

    assertEquals(response.getStatusCode(), HttpStatus.OK);
    PluginDTO pluginDTO = response.getBody();
    assertNotNull(pluginDTO);
}

@Test
public void getPluginTest() throws Exception {
    PluginDTO createdDto = new PluginDTO(UUID.fromString("20a246e8-7b74-4081-bb62-6911b8ef43ef"),"Foo", "0.1", "TestAuthor");
    Plugin created = new Plugin(createdDto.getUuid(), createdDto.getName(), createdDto.getVersion(), createdDto.getAuthor());
    pluginRepository.saveAndFlush(created);

    pluginRepository.findAll().forEach(plugin -> System.out.print(plugin.toString()));

    try {
        Plugin plugin = pluginRepository.findById(createdDto.getUuid());
    } catch (Exception ex) {
        ex.printStackTrace();
    }

    System.out.println(pluginService.fetchPlugin(createdDto.getUuid()).toString());

    assertEquals(pluginService.fetchPlugin(createdDto.getUuid()), created);

    RestTemplate restTemplate = new RestTemplate();
    ResponseEntity<PluginDTO> response = restTemplate.getForEntity(resourceUrl + createdDto.getUuid(), PluginDTO.class);

    assertEquals(response.getStatusCode(), HttpStatus.OK);
}

@After
public void tearDown() {
    pluginRepository.deleteAllInBatch();
}
}

    System.out.println(pluginRepository.findById(createdDto.getUuid()).get().toString()); // this line 

    assertEquals(pluginService.fetchPlugin(createdDto.getUuid()), created);

    RestTemplate restTemplate = new RestTemplate();
    ResponseEntity<PluginDTO> response = restTemplate.getForEntity(resourceUrl + createdDto.getUuid(), PluginDTO.class);

    assertEquals(response.getStatusCode(), HttpStatus.OK);
}

尽管固定值是由 createdDto 对象设置的，但 return 它并没有，我可以看到这些值也在数据库中。这就是它 returns...

20a246e8-7b74-4081-bb62-6911b8ef43ef:Foo:0.1:TestAuthor
java.util.NoSuchElementException: No value present

at java.util.Optional.get(Optional.java:135)
at net.ihq.plugin.controller.PluginServiceIntegrationTest.getPluginTest(PluginServiceIntegrationTest.java:79)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.junit.runners.model.FrameworkMethod.runReflectiveCall(FrameworkMethod.java:50)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
at org.springframework.test.context.junit4.statements.RunBeforeTestExecutionCallbacks.evaluate(RunBeforeTestExecutionCallbacks.java:74)
at org.springframework.test.context.junit4.statements.RunAfterTestExecutionCallbacks.evaluate(RunAfterTestExecutionCallbacks.java:84)
at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26)
at org.springframework.test.context.junit4.statements.RunBeforeTestMethodCallbacks.evaluate(RunBeforeTestMethodCallbacks.java:75)
at org.springframework.test.context.junit4.statements.RunAfterTestMethodCallbacks.evaluate(RunAfterTestMethodCallbacks.java:86)
at org.springframework.test.context.junit4.statements.SpringRepeat.evaluate(SpringRepeat.java:84)
at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:251)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:97)
at org.junit.runners.ParentRunner.run(ParentRunner.java:290)
at org.junit.runners.ParentRunner.schedule(ParentRunner.java:71)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
at org.junit.runners.ParentRunner.access[=12=]0(ParentRunner.java:58)
at org.junit.runners.ParentRunner.evaluate(ParentRunner.java:268)
at org.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate(RunBeforeTestClassCallbacks.java:61)
at org.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate(RunAfterTestClassCallbacks.java:70)
at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:190)
at org.junit.runner.JUnitCore.run(JUnitCore.java:137)
at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:68)
at com.intellij.rt.execution.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:47)
at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:242)
at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:70)

我很困惑，因为我不明白为什么它可以保存对象但不能用我设置的相同固定值取回它，但它实际上是我打印对象列表在数据库上线之前发生错误。

存储库

@Repository
public interface PluginRepository extends JpaRepository<Plugin, UUID> {

@Query(value = "SELECT * FROM plugins WHERE name=?", nativeQuery = true)
Plugin findByName(String name);
}

实体

@Data
@Entity
@Table(name = "plugins")
@NoArgsConstructor
public class Plugin {

@Id
@Convert(converter = UUIDConverter.class)
@Column(unique = true, updatable = false, length = 36)
private UUID uuid;
private String name;
private String version;
private String author;

public Plugin(UUID uuid, String name, String version, String author) {
    this.uuid = uuid;
    this.name = name;
    this.version = version;

    if (author == null) author = "JoeTAMatthews";

    this.author = author;
}

public Plugin(String name, String version, String author) {
    this(UUID.randomUUID(), name, version, author);
}

public void update(PluginDTO updated) {
    this.name = updated.getName();
    this.version = updated.getVersion();
    this.author = updated.getAuthor();
}

@Override
public String toString() {
    return uuid.toString() + ":" + name + ":" + version + ":" + author;
}
}

Answer 1

很抱歉给您带来不便，但它不起作用的原因是数据库不支持 UUID 类型，所以我所要做的就是获取 uuid 的字符串类型以实际获得结果，因为我的 UUIDConverter，谢谢你的帮助。

当 id 与正确的数据库行匹配时，JpaRepository findById 方法返回 Optional.empty？

JpaRepository findById method returning Optional.empty when id is matching to the correct database row?

spring-mvc

spring-mvc-test

spring-boot