java 无法使用 Spring @Cacheable 和 @EnableCaching
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Unable to use Spring @Cacheable and @EnableCaching
提问by Pleymor
I'm trying to replace my old:
我正在尝试更换旧的：
@Component
public interface MyEntityRepository extends JpaRepository<MyEntity, Integer> {
@QueryHints({@QueryHint(name = CACHEABLE, value = "true")})
MyEntity findByName(String name);
}
by this:
这样：
@Component
public interface MyEntityRepository extends JpaRepository<MyEntity, Integer> {
@Cacheable(value = "entities")
MyEntity findByName(String name);
}
Because I want to use advanced caching features like no caching of null values, etc.
因为我想使用高级缓存功能，例如不缓存空值等。
To do so, I followed Spring tutorial https://spring.io/guides/gs/caching/
为此，我遵循了 Spring 教程https://spring.io/guides/gs/caching/
If I don't annotate my Application.java, caching simply doesn't work.
如果我不注释我的 Application.java，缓存根本不起作用。
But if I add @EnableCachingand a CacheManager bean:
但是如果我添加@EnableCaching一个 CacheManager bean：
package my.application.config;
@EnableWebMvc
@ComponentScan(basePackages = {"my.application"})
@Configuration
@EnableCaching
public class Application extends WebMvcConfigurerAdapter {
@Bean
public CacheManager cacheManager() {
return new ConcurrentMapCacheManager("entities");
}
// ...
}
I get the following error at startup:
我在启动时收到以下错误：
java.lang.IllegalStateException: No CacheResolver specified, and no bean of type CacheManager found. Register a CacheManager bean or remove the @EnableCaching annotation from your configuration
java.lang.IllegalStateException：未指定 CacheResolver，也未找到 CacheManager 类型的 bean。注册一个 CacheManager bean 或从您的配置中删除 @EnableCaching 注释
I get the same error if I replace My CacheManager bean by a CacheResolver bean like:
如果我用 CacheResolver bean 替换 My CacheManager bean，我会得到同样的错误：
@Bean
public CacheResolver cacheResolver() {
return new SimpleCacheResolver(new ConcurrentMapCacheManager("entities"));
}
Do I miss something ?
我错过了什么吗？
回答by Pleymor
@herau You were right I had to name the bean ! The problem was that there were another bean "cacheManager", so finally, I didn't annotate Application, and created a configuration as:
@herau 你说得对，我必须给豆子命名！问题是还有一个bean“cacheManager”，所以最后，我没有注释Application，而是创建了一个配置：
@EnableCaching
@Configuration
public class CacheConf{
@Bean(name = "springCM")
public CacheManager cacheManager() {
return new ConcurrentMapCacheManager("entities");
}
}
in MyEntityRepository:
在MyEntityRepository：
@Cacheable(value = "entities", cacheManager = "springCM")
MyEntity findByName(String name);
回答by Aliya
In my case the Spring Boot library was old, and there was no way to easily upgrade it. So I used EHCache 2 version, and it worked in my application. Here is a project I found useful to refer to: https://github.com/TechPrimers/spring-ehcache-example/blob/master/src/main/resources/ehcache.xml
就我而言，Spring Boot 库很旧，无法轻松升级它。所以我使用了 EHCache 2 版本，它在我的应用程序中工作。这是我发现有用的一个项目：https: //github.com/TechPrimers/spring-ehcache-example/blob/master/src/main/resources/ehcache.xml
