12:20 a.m.
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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