Question

我已经尝试过几种方法在Spring Boot应用程序上实现缓存，这似乎是正确的方法，但是它只是记录了

CacheStatistics,CacheManager=urn.X-ehcache.jsr107-default-config,Cache=studentCache
Registering Ehcache MBean javax.cache:type=CacheStatistics,CacheManager=urn.X-ehcache.jsr107-default-config,Cache=studentCache

我有一个事件记录器，但看不到它的任何输出：

@Component
public class EventLogger implements CacheEventListener<Object, Object> {

    private static final Logger LOGGER = LoggerFactory.getLogger(EventLogger.class);

    @Override
    public void onEvent(CacheEvent<?, ?> event) {
        LOGGER.info("Event: " + event.getType() + " Key: " + event.getKey() + " old value: " + event.getOldValue() + " new value: " + event.getNewValue());
    }
}

CacheConfig

@Configuration
public class CacheConfig {

    @Bean
    public JCacheManagerCustomizer cacheManagerCustomizer() {
        return new JCacheManagerCustomizer() {

            @Override
            public void customize(CacheManager cacheManager) {
                cacheManager.createCache("studentCache", new MutableConfiguration<>()
                        .setExpiryPolicyFactory(CreatedExpiryPolicy.factoryOf(new Duration(TimeUnit.MINUTES, 5)))
                        .setStoreByValue(false)
                        .setStatisticsEnabled(true));

            }
        };
    }

}

方法缓存

@RequestMapping(method = GET)
@ResponseBody
Cacheable(value = "studetNode")
    public List<StudentNodeDto> findAll(HttpServletResponse response) {
         val studentNodes = service.findAll();

位于资源下方的ehcache.xml

<config
        xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance'
        xmlns='http://www.ehcache.org/v3'
        xmlns:jsr107='http://www.ehcache.org/v3/jsr107'>

    <service>
        <jsr107:defaults>
            <jsr107:cache name="studentCache" template="heap-cache"/>
        </jsr107:defaults>
    </service>

    <cache-template name="heap-cache">
        <listeners>
            <listener>
                <class>org.terracotta.ehcache.EventLogger</class>
                <event-firing-mode>ASYNCHRONOUS</event-firing-mode>
                <event-ordering-mode>UNORDERED</event-ordering-mode>
                <events-to-fire-on>CREATED</events-to-fire-on>
                <events-to-fire-on>UPDATED</events-to-fire-on>
                <events-to-fire-on>EXPIRED</events-to-fire-on>
                <events-to-fire-on>REMOVED</events-to-fire-on>
                <events-to-fire-on>EVICTED</events-to-fire-on>
            </listener>
        </listeners>
        <resources>
            <heap unit="entries">2000</heap>
            <offheap unit="MB">100</offheap>
        </resources>
    </cache-template>
</config>

等级依赖性springBootVersion = '2.0.2.RELEASE'

    compile group: 'org.springframework.boot', name: 'spring-boot-starter', version: springBootVersion
        compile group: 'org.springframework.boot', name: 'spring-boot-starter-web', version: springBootVersion
//Cache
    compile group: 'org.springframework.boot', name: 'spring-boot-starter-cache', version: '2.1.1.RELEASE'
    compile group: 'org.ehcache', name: 'ehcache', version: '3.4.0'
    compile group: 'javax.cache', name: 'cache-api', version: '1.1.0'

我查看了许多帖子和博客，看来我正在做此事，但是我必须在某个地方弄错了。

@Cacheable key on multiple method arguments

https://docs.spring.io/spring/docs/current/spring-framework-reference/integration.html#cache

https://www.baeldung.com/spring-cache-tutorial

https://docs.spring.io/spring-boot/docs/current/reference/html/boot-features-caching.html

https://www.baeldung.com/hibernate-second-level-cache

https://medium.com/@igorkosandyak/spring-boot-caching-d74591abe117

建议？

---------------更新1 -----------------

我收到一条错误消息：

    Error creating bean with name 'cacheManager' defined in class path 
    resource
 [org/springframework/boot/autoconfigure/cache/JCacheCacheConfiguration.class]: Unsatisfied dependency expressed through method 'cacheManager' parameter 0; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'jCacheCacheManager' defined in class path resource [org/springframework/boot/autoconfigure/cache/JCacheCacheConfiguration.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [javax.cache.CacheManager]: Factory method 'jCacheCacheManager' threw exception; nested exception is org.ehcache.jsr107.MultiCacheException: [Exception 0] org.terracotta.ehcache.EventLogger

我在添加时得到这个：

# caching
spring.cache.jcache.provider=org.ehcache.jsr107.EhcacheCachingProvider
spring.cache.jcache.config=classpath:ehcache.xml

踪迹

restartedMain] heConfiguration$JCacheAvailableCondition : Condition JCacheCacheConfiguration.JCacheAvailableCondition on org.springframework.boot.autoconfigure.cache.JCacheCacheConfiguration matched due to AnyNestedCondition 1 matched 1 did not; NestedCondition on JCacheCacheConfiguration.JCacheAvailableCondition.CustomJCacheCacheManager @ConditionalOnSingleCandidate (types: javax.cache.CacheManager; SearchStrategy: all) did not find any beans; NestedCondition on JCacheCacheConfiguration.JCacheAvailableCondition.JCacheProvider JCache JCache provider specified

--------------更新2 ------------------

我在gradle文件中添加了以下内容

task showJarLocations {
    doLast {
        configurations.compile.resolve().each { file ->
            println file.canonicalPath
        }
    }
}

和ehcache一起显示的唯一jar是：

/org.ehcache/ehcache/3.4.0/cac1f0840af0040a81401dfa55fa31a4ccc17932/ehcache-3.4.0.jar
and

javax.cache/cache-api/1.1.0/77bdcff7814076dfa61611b0db88487c515150b6/cache-api-1.1.0.jar

我有

spring.cache.jcache.provider=org.ehcache.jsr107.EhcacheCachingProvider
spring.cache.jcache.config=classpath:ehcache.xml

在application.properties中也是

。这应该可以解释为什么我添加spring.cache.jcache.config=classpath:ehcache.xml.

时失败

但是在intellij中，它在我的项目结构中：

+--- org.springframework.boot:spring-boot-starter-cache:2.1.1.RELEASE
|    +--- org.springframework.boot:spring-boot-starter:2.1.1.RELEASE -> 2.0.2.RELEASE (*)
|    \--- org.springframework:spring-context-support:5.1.3.RELEASE -> 5.0.6.RELEASE
|         +--- org.springframework:spring-beans:5.0.6.RELEASE (*)
|         +--- org.springframework:spring-context:5.0.6.RELEASE (*)
|         \--- org.springframework:spring-core:5.0.6.RELEASE (*)
+--- org.ehcache:ehcache:3.4.0
|    \--- org.slf4j:slf4j-api:1.7.7 -> 1.7.25
+--- javax.cache:cache-api:1.1.0
+--- org.apache.tika:tika-core:1.19.1
+--- org.mapstruct:mapstruct-jdk8:1.2.0.Final
+--- org.projectlombok:lombok:1.18.2

Answer 1

我发现使用spring-boot-starter-cache会产生一些细微的问题。如果找不到您的ehcache.xml或您不正确地命名了缓存名称，那么Spring似乎会退回到通用缓存实现，从而隐藏了问题。尝试删除spring-boot-starter-cache作为依赖项并添加：

<dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-context-support</artifactId>
</dependency>

还添加ehcache作为显式依赖项，然后查看是否有帮助。您甚至不需要访问CacheManager，因为您正在使用ehcache.xml。 xml的全部目的是使配置声明性的并且不在代码之外。

Answer 2

确保springboot应用程序已使用@EnableCaching
确保@Cacheable中的名称与您的缓存名称匹配（发布的内容不匹配。）
```
@Cacheable(value = "studentCache")
```
删除您的CacheConfig
将ehcache.xml文件放置在资源的子文件夹中，以确保您没有从其他jar中拾取文件。
```
e.g. `resources/myconfig/ehcache.xml`
```
在application.properties中设置属性以告诉spring在哪里可以找到配置文件
```
spring.cache.jcache.config=classpath:myconfig/ehcache.xml
```

使用简化的ehcache.xml。例如

<config
    xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance'
    xmlns='http://www.ehcache.org/v3'
    xmlns:jsr107='http://www.ehcache.org/v3/jsr107'
    xsi:schemaLocation="
        http://www.ehcache.org/v3 http://www.ehcache.org/schema/ehcache-core-3.0.xsd
        http://www.ehcache.org/v3/jsr107 http://www.ehcache.org/schema/ehcache-107-ext-3.0.xsd">

    <cache alias="studentCache" uses-template="heap-cache" />

    <cache-template name="heap-cache">
        <resources>
            <heap unit="entries">2000</heap>
            <offheap unit="MB">100</offheap>
        </resources>
    </cache-template>

</config>

如果仍然失败，请发布结果以显示您如何知道它失败。

使用<jsr107:cache元素时需要CacheConfig的原因是ehcache只会将模板与缓存名称相关联。它不会创建缓存。当您以编程方式（即在CacheConfig中）创建缓存时，将使用该模板。因此，如果您尝试定义缓存的ehcache.xml，则不需要CacheConfig

Answer 3

让您的实体或d实施Serializable。以我的情况工作。

无法使用ehcache版本3.4.0和Spring Boot 2.0.2进行缓存

3 个答案: