2 Replies Latest reply on Jul 2, 2009 6:21 AM by sridhar_ratna

    why eviction needs Mbean in standalone environment?

    sridhar_ratna
    sridhar_ratna Jul 2, 2009 1:20 AM

      Hi,

      I am specifying eviction policy for some of the regions in jboss cache.
      When i started the cache, its throwing exception that

      java.lang.NullPointerException
 at org.jboss.cache.config.parsing.XmlConfigurationParser2x.getMBeanElement(XmlConfigurationParser2x.java:214)


      My configuration file is 
      <?xml version="1.0" encoding="UTF-8"?>

<jbosscache xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 xmlns="urn:jboss:jbosscache-core:config:3.1">

 <transaction
 transactionManagerLookupClass="org.jboss.cache.transaction.GenericTransactionManagerLookup"
 syncRollbackPhase="false" syncCommitPhase="false" />

 <locking isolationLevel="REPEATABLE_READ"
 lockParentForChildInsertRemove="false" lockAcquisitionTimeout="200000"
 nodeLockingScheme="mvcc" writeSkewCheck="false" useLockStriping="false"
 concurrencyLevel="500" />

 <eviction wakeUpInterval="5000">
 <default algorithmClass="org.jboss.cache.eviction.LRUPolicy"
 eventQueueSize="200000">
 <property name="maxNodes" value="10000" />
 <property name="timeToLive" value="0" />
 </default>
 <region name="/male" >
 <property name="maxNodes" value="10000" />
 <property name="timeToLive" value="-1" />
 <property name="maxAge" value="-1" />
 </region>
 </eviction>
 <!-- <invocationBatching enabled="true"/> -->
 <jmxStatistics enabled="true" />

 <loaders passivation="false" shared="false">
 <preload>
 <node fqn="/male" />
 </preload>

 <loader class="org.jboss.cache.loader.jdbm.JdbmCacheLoader"
 async="false" fetchPersistentState="true" ignoreModifications="false">
 <properties>
 location=c:/cache/ncrb
 </properties>
 </loader>
 </loaders>
</jbosscache>


      and the code fragment is 
      package com.cmc.facts.grid;

import org.apache.log4j.Logger;
import org.jboss.cache.Cache;
import org.jboss.cache.CacheFactory;
import org.jboss.cache.DefaultCacheFactory;
import org.jboss.cache.Fqn;
import org.jboss.cache.Node;

/**
 * @author sridhar
 *
 */
public final class GridJbossCacheManager {

 public static final String CACHE_CFG_PATH = System.getProperty("jbcachexml.path");

 /** JBoss Cache instance. */
 private Cache<Long, Object> cache = null;

 /** Cache node for caching example data. */
 private Node<Long, Object> cacheRoot = null;

 /** Singleton instance. */
 private static GridJbossCacheManager instance = null;

 public static GridJbossCacheManager getInstance() {
 if (instance == null) {
 instance = new GridJbossCacheManager();
 }
 return instance;
 }

 public void start() {

 try {
 CacheFactory<Long, Object> factory = new DefaultCacheFactory<Long, Object>();
 cache = factory.createCache(CACHE_CFG_PATH);

 cache.create();
 cache.start();
 cacheRoot = cache.getRoot();
 } catch (Exception e) {
 LOG.error(e.getMessage(), e);
 System.exit(1);
 }
 LOG.debug("JBoss Cache data manager started.");
 }

 public void stop() {
 if (cache != null) {
 cache.stop();
 }

 instance = null;
 LOG.debug("JBoss Cache data manager stopped.");
 }

 public Cache<Long, Object> getCache() {
 return cache;
 }

 public static void main(String[] args) {
 GridJbossCacheManager cacheMgr = GridJbossCacheManager.getInstance();
 cacheMgr.start();

 }
}


      the exception stacktrace is 

      java.lang.NullPointerException
 at org.jboss.cache.config.parsing.XmlConfigurationParser2x.getMBeanElement(XmlConfigurationParser2x.java:214)
 at org.jboss.cache.config.parsing.XmlConfigurationParser2x.parseStream(XmlConfigurationParser2x.java:104)
 at org.jboss.cache.config.parsing.XmlConfigurationParser2x.parseFile(XmlConfigurationParser2x.java:90)
 at org.jboss.cache.DefaultCacheFactory.createCache(DefaultCacheFactory.java:91)
 at org.jboss.cache.DefaultCacheFactory.createCache(DefaultCacheFactory.java:77)
 at com.cmc.facts.grid.GridJbossCacheManager.start(GridJbossCacheManager.java:80)
 at com.cmc.facts.grid.StartGridJbossCacheNode.main(StartGridJbossCacheNode.java:12)


      I am using Jboss 3.1 in a standalone environment.
      From the stacktrace, its looking for MBeans. Why does it require Mbeans?

      Please help me.
      Thanks in advance

      Sridhar

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