spring-boot - Spring Boot 测试尝试第二次初始化 cache2k 并失败

Question

将 cache2k 添加到我的项目后一些 @SpringBootTest因错误而停止工作:

java.lang.IllegalStateException: Cache already created: 'cache'

下面我提供了重现的最小示例:

前往 start.spring.io 并使用 Cache starter 创建一个最简单的 Maven 项目，然后添加 cache2k 依赖项:

<properties>
    <java.version>1.8</java.version>
    <cache2k-version>1.2.2.Final</cache2k-version>
</properties>

<dependencies>
    <dependency>
        <groupId>org.cache2k</groupId>
        <artifactId>cache2k-api</artifactId>
        <version>${cache2k-version}</version>
    </dependency>
    <dependency>
        <groupId>org.cache2k</groupId>
        <artifactId>cache2k-core</artifactId>
        <version>${cache2k-version}</version>
        <scope>runtime</scope>
    </dependency>
    <dependency>
        <groupId>org.cache2k</groupId>
        <artifactId>cache2k-spring</artifactId>
        <version>${cache2k-version}</version>
    </dependency>

    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-cache</artifactId>
    </dependency>

    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-test</artifactId>
        <scope>test</scope>
    </dependency>
</dependencies>

现在配置最简单的缓存:

@SpringBootApplication
@EnableCaching
public class CachingDemoApplication {

    public static void main(String[] args) {
        SpringApplication.run(CachingDemoApplication.class, args);
    }

    @Bean
    public CacheManager springCacheManager() {
        SpringCache2kCacheManager cacheManager = new SpringCache2kCacheManager();
        cacheManager.addCaches(b -> b.name("cache"));
        return cacheManager;
    }

}

并添加任何服务(我们将 @MockBean 在我们的一项测试中:

@Service
public class SomeService {
    public String getString() {
        System.out.println("Executing service method");
        return "foo";
    }
}

现在两个 @SpringBootTest需要测试来重现问题:

@SpringBootTest
@RunWith(SpringRunner.class)
public class SpringBootAppTest {

    @Test
    public void getString() {
        System.out.println("Empty test");
    }
}

@RunWith(SpringRunner.class)
@SpringBootTest
public class WithMockedBeanTest {

    @MockBean
    SomeService service;

    @Test
    public void contextLoads() {
    }
}

请注意，第二个测试模拟了 @MockBean .这会导致错误(下面的堆栈跟踪)。

Caused by: java.lang.IllegalStateException: Cache already created: 'cache'
    at org.cache2k.core.CacheManagerImpl.newCache(CacheManagerImpl.java:174)
    at org.cache2k.core.InternalCache2kBuilder.buildAsIs(InternalCache2kBuilder.java:239)
    at org.cache2k.core.InternalCache2kBuilder.build(InternalCache2kBuilder.java:182)
    at org.cache2k.core.Cache2kCoreProviderImpl.createCache(Cache2kCoreProviderImpl.java:215)
    at org.cache2k.Cache2kBuilder.build(Cache2kBuilder.java:837)
    at org.cache2k.extra.spring.SpringCache2kCacheManager.buildAndWrap(SpringCache2kCacheManager.java:205)
    at org.cache2k.extra.spring.SpringCache2kCacheManager.lambda$addCache$2(SpringCache2kCacheManager.java:143)
    at java.util.concurrent.ConcurrentHashMap.compute(ConcurrentHashMap.java:1853)
    at org.cache2k.extra.spring.SpringCache2kCacheManager.addCache(SpringCache2kCacheManager.java:141)
    at org.cache2k.extra.spring.SpringCache2kCacheManager.addCaches(SpringCache2kCacheManager.java:132)
    at com.example.cachingdemo.CachingDemoApplication.springCacheManager(CachingDemoApplication.java:23)
    at com.example.cachingdemo.CachingDemoApplication$$EnhancerBySpringCGLIB$$2dce99ca.CGLIB$springCacheManager$0(<generated>)
    at com.example.cachingdemo.CachingDemoApplication$$EnhancerBySpringCGLIB$$2dce99ca$$FastClassBySpringCGLIB$$bbd240c0.invoke(<generated>)
    at org.springframework.cglib.proxy.MethodProxy.invokeSuper(MethodProxy.java:244)
    at org.springframework.context.annotation.ConfigurationClassEnhancer$BeanMethodInterceptor.intercept(ConfigurationClassEnhancer.java:363)
    at com.example.cachingdemo.CachingDemoApplication$$EnhancerBySpringCGLIB$$2dce99ca.springCacheManager(<generated>)
    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.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:154)
    ... 52 more

如果删除 @MockBean ，两个测试都会通过。

如何在我的测试套件中避免此错误？

Answer 1

您的第二个测试代表了不同的 ApplicationContext总之，测试框架将为它启动一个专用的。如 cache2k是有状态的(例如为给定的类加载器共享 CacheManager，如果它已经存在)，第二个上下文将尝试创建一个新的 CacheManager而第一个仍然处于事件状态。

您要么需要将其中一个测试标记为脏(请参阅 @DirtiesContext )，这将关闭上下文并关闭 CacheManager ，或者您可以用不需要所有这些的选项替换缓存基础结构，请参阅 @AutoConfigureCache .

如 cache2k以这样一种方式工作，它需要您弄脏上下文，我强烈建议使用后面的选项来交换它。