Spring的@Cacheable for SpringOne

Question

我想在我的Spring Boot 4应用程序中添加缓存。 作为一个键，我想使用我的实体的id（类型Long），value是我的实体。

@EnableCaching
@SpringBootApplication
public class SpringBootMainApplication {
  public static void main(String[] args) {
    SpringApplication.run(SpringBootMainApplication.class, args);
  }
}

@Configuration
public class AppConfiguration {
  @Bean
  public CacheManager cacheManager() {
    return new ConcurrentMapCacheManager("findOne");
  }
}

public interface SampleEntityService extends CrudRepository<SampleEntity, Long> {
  @Cacheable(key = "#a0", value = "findOne")
  SampleEntity findOne(Long id);

但是当我在测试中调用findOne方法时，我得到了一个例外：

java.lang.ClassCastException: org.springframework.cache.support.SimpleValueWrapper cannot be cast to my.springboot.model.SampleEntity
  at my.springboot.SampleEntityCacheTest.aaa(SampleEntityCacheTest.java:46)
  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: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.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26)
  at org.springframework.test.context.junit4.statements.RunBeforeTestMethodCallbacks.evaluate(RunBeforeTestMethodCallbacks.java:73)
  at org.springframework.test.context.junit4.statements.RunAfterTestMethodCallbacks.evaluate(RunAfterTestMethodCallbacks.java:82)
  at org.springframework.test.context.junit4.statements.SpringRepeat.evaluate(SpringRepeat.java:73)
  at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
  at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:224)
  at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:83)
  at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
  at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
  at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
  at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
  at org.junit.runners.ParentRunner$2.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:68)
  at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
  at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:163)
  at org.junit.runner.JUnitCore.run(JUnitCore.java:137)
  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)

根据一些教程，我尝试使用许多变体，但所有变体都失败了。

@Cacheable(key = "#a0", value = "findOne")
@Cacheable(key = "#p0", value = "findOne")
@Cacheable(key = "a0", value = "findOne")
@Cacheable(key = "p0", value = "findOne")
@Cacheable(key = "#id", value = "findOne")
@Cacheable(key = "id", value = "findOne")
@Cacheable(key = "#root.id", value = "findOne")
@Cacheable(key = "root.id", value = "findOne")

我做错了什么？

=======回答=========

正确的解决方案是：

@Cacheable(key = "#a0", value = "findOne")

在测试中我应该做的就是这样：

@Test
public void aaa() {
    SampleEntity entity = sampleEntityService.save(create("name1", uuid(1)));
    sampleEntityService.findOne(entity.getId());
    SampleEntity entityFromCache =(SampleEntity) cacheManager.getCache("findOne").get(entity.getId()).get();
    assertNotNull(entityFromCache);
}