Failure to configure a cache with a TimeToLive expiration

[mortenhattesen]

Using JBoss Cache 3.0.3-GA, I have not been able to configure a simple cache with a "TimeToLive" expiration.

Firstly, whenever the eviction thread wakes up, a warning is logged:

WARN org.jboss.cache.eviction.ExpirationAlgorithm - No expiration key 'expiration' for Node: /

Secondly, no eviction is being performed.

The configuration is reproduced in this unit-test code (the production code has the cache wired up using a Spring IOC context configuration):

import static org.junit.Assert.assertEquals;

import org.apache.log4j.Logger;
import org.jboss.cache.Cache;
import org.jboss.cache.DefaultCacheFactory;
import org.jboss.cache.Node;
import org.jboss.cache.config.Configuration;
import org.jboss.cache.config.EvictionConfig;
import org.jboss.cache.config.EvictionRegionConfig;
import org.jboss.cache.eviction.ExpirationAlgorithmConfig;
import org.junit.Test;


public class TestJbossCacheConfig {
 private static final Logger logger = Logger.getLogger(TestJbossCacheConfig.class);
 final Cache<String, String> cache;
 private final long TIME_TO_LIVE = 1000;
 private Node<String, String> root;

 public TestJbossCacheConfig() {
 ExpirationAlgorithmConfig eac = new ExpirationAlgorithmConfig();
 eac.setTimeToLive(TIME_TO_LIVE);

 EvictionRegionConfig erc = new EvictionRegionConfig();
 erc.setRegionName("/");
 erc.setEvictionAlgorithmConfig(eac);

 EvictionConfig ec = new EvictionConfig();
 ec.setWakeupInterval(TIME_TO_LIVE / 2); //msec
 ec.setDefaultEvictionRegionConfig(erc);

 Configuration config = new Configuration();
 config.setEvictionConfig(ec);

 cache = new DefaultCacheFactory<String, String>().createCache(config);
 root = cache.getRoot();
 }


 @Test
 //@Ignore
 public void testEviction() throws InterruptedException {

 root.put("1", "one");
 root.put("2", "two");

 assertEquals("one", root.get("1"));

 assertEquals(2, root.dataSize());

 logger.info("Sleeps while eviction kicks in");
 Thread.sleep(TIME_TO_LIVE * 2);
 /*
 * During sleep:
 * "WARN org.jboss.cache.eviction.ExpirationAlgorithm - No expiration key 'expiration' for Node: /"
 */

 /*
 * java.lang.AssertionError: expected:<0> but was:<2>
 */
 assertEquals(0, root.dataSize());
 }
}

What am I doing wrong here?

Another point: Although I know that JBoss cache is typically configured using an XML, or an IOC framework, it seems a little excessive to require four levels of nested configuration objects to configure a simple cache:

configuration = new Configuration(new EvictionConfig(new EvictionRegionConfig(new ExpirationAlgorithmConfig())))