Getting started with Ehcache 3

You can introduce caching to your Java application quite easily with Ehcache, either using its new, powerful API or using the javax.cache API as defined in the JSR-107 specification.

Using the core Ehcache v3 API

Ehcache 3 has a streamlined, modernized type-safe API (and configuration) that will greatly improve your coding experience when compared to Ehcache 2.x.

Downloading the jars

You can download the jar directly from github or get it from Maven Central:

    <dependency>
      <groupId>org.ehcache</groupId>
      <artifactId>ehcache</artifactId>
      <version>3.8.1</version>
    </dependency>      

Coding to the Ehcache 3 API

      CacheManager cacheManager = CacheManagerBuilder.newCacheManagerBuilder()
          .withCache("preConfigured",
               CacheConfigurationBuilder.newCacheConfigurationBuilder(Long.class, String.class,
                                              ResourcePoolsBuilder.heap(100))
               .build())
          .build(true);

      Cache<Long, String> preConfigured
          = cacheManager.getCache("preConfigured", Long.class, String.class);

      Cache<Long, String> myCache = cacheManager.createCache("myCache",
          CacheConfigurationBuilder.newCacheConfigurationBuilder(Long.class, String.class,
                                        ResourcePoolsBuilder.heap(100)).build());

      myCache.put(1L, "da one!");
      String value = myCache.get(1L);

      cacheManager.close();

      

Using the JSR-107 API

Downloading the jars

You'll need the Ehcache distribution as mentioned above, you'll also require the actual JSR-107 API:

    <dependency>
      <groupId>javax.cache</groupId>
      <artifactId>cache-api</artifactId>
      <version>1.1.0</version>
    </dependency>

Not quite ready yet?

Read the user documentation for everything you've been wondering about the new API!

    <dependency>
      <groupId>net.sf.ehcache</groupId>
      <artifactId>ehcache</artifactId>
      <version>2.10.3</version>
    </dependency>      

      // Create a cache manager
      final CacheManager cacheManager = new CacheManager();

      // create the cache called "hello-world"
      final Cache cache = cacheManager.getCache("hello-world");

      // create a key to map the data to
      final String key = "greeting";

      // Create a data element
      final Element putGreeting = new Element(key, "Hello, World!");

      // Put the element into the data store
      cache.put(putGreeting);

      // Retrieve the data element
      final Element getGreeting = cache.get(key);

      // Print the value
      System.out.println(getGreeting.getObjectValue());