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

    why eviction needs Mbean in standalone environment?

    sridhar reddy Newbie

      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