How can I configure Ehcache 3 + spring boot + java config without xml?

Question

I use Ehcache 2 + spring boot. Here is my config:

@Bean
public CacheManager cacheManager() {
    return new EhCacheCacheManager(ehCacheCacheManager().getObject());
}

@Bean
public EhCacheManagerFactoryBean ehCacheCacheManager() {
    EhCacheManagerFactoryBean cmfb = new EhCacheManagerFactoryBean();
    cmfb.setConfigLocation(new ClassPathResource("ehcache.xml"));
    cmfb.setShared(true);
    return cmfb;
}

ehcache.xml - in resources.

Now I want to use Ehcache 3 + spring boot and Java config instead xml but I haven't found any example for this. My questions:

1) Why almost all examples are based on xml? How can this be better than java config?

2) How can I configure Ehcache 3 using java config in spring boot without using xml?

Answer 1

Here is an equivalent java configuration for creating the Ehcache manager bean.

ApplicationConfig.java

@Configuration
@EnableCaching
public class ApplicationConfig {

    @Bean
    public CacheManager ehCacheManager() {
        CachingProvider provider = Caching.getCachingProvider();
        CacheManager cacheManager = provider.getCacheManager();

        CacheConfigurationBuilder<String, String> configuration =
                CacheConfigurationBuilder.newCacheConfigurationBuilder(
                        String.class,
                        String.class,
                     ResourcePoolsBuilder
                             .newResourcePoolsBuilder().offheap(1, MemoryUnit.MB))
                .withExpiry(ExpiryPolicyBuilder.timeToLiveExpiration(Duration.ofSeconds(20)));

        javax.cache.configuration.Configuration<String, String> stringDoubleConfiguration = 
Eh107Configuration.fromEhcacheCacheConfiguration(configuration);

            cacheManager.createCache("users", stringDoubleConfiguration);
            return cacheManager;

    }

}

ServiceImpl.java

@Service
public class ServiceImpl {

    @Cacheable(cacheNames = {"users"})
    public String getThis(String id) {
        System.out.println("Method called............");
        return "Value "+ id;
    }
}

pom.xml

     <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-cache</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
    </dependency>
    <dependency>
        <groupId>javax.cache</groupId>
        <artifactId>cache-api</artifactId>
    </dependency>
    <dependency>
        <groupId>org.ehcache</groupId>
        <artifactId>ehcache</artifactId>
    </dependency>

Answer 2

There are a lot of examples. I personally am a fan of the Java configuration.

Here are the main official examples:

• Basic programmatic configuration
• Full fledge Spring-Boot configuration (includes clustering)
• Simpler configuration with Spring PetClinic