1:13 p.m.
User development,
A new message was posted in the thread "NPE in ClusteredCacheLoader (JBoss Cache
3.2.1.GA)":
http://community.jboss.org/message/521550#521550
Author : Jamie S
Profile : http://community.jboss.org/people/jamie.s
Message:
--------------------------------------------------------------
Hello,
Trying out a chained cacheloader configuration.
Previously, I had JDBCCacheLoader as the only loader, and that is working properly.
Now, I want to delegate to the cluster first, so I added ClusteredCacheLoader first.
However, when I start the first node in the cluster, and get to my first API call (which
is addChild() ), I hit an NPE in clustered cache loader:
java.lang.NullPointerException
at org.jboss.cache.loader.ClusteredCacheLoader.exists(ClusteredCacheLoader.java:212)
Which I take to mean commandsFactory is null:
public boolean exists(Fqn name) throws Exception
{
// DON'T make a remote call if this is a remote call in the first place - leads
to deadlocks - JBCACHE-1103
if (!isCacheReady() || !cache.getInvocationContext().isOriginLocal()) return false;
lock.acquireLock(name, false);
try
{
ExistsCommand command = commandsFactory.buildExistsNodeCommand(name);
Object resp = callRemote(command);
return resp != null && (Boolean) resp;
}
finally
{
lock.releaseLock(name);
}
}
It would seem though, that isCacheReady returned true, and the invocationContext says
it's a local call...
Here's my loader config:
<loaders passivation="false" shared="false">
<loader
class="org.jboss.cache.loader.ClusteredCacheLoader"
async="false"
ignoreModifications="true"
>
<properties>
timeout=1500
</properties>
</loader>
<!-- if passivation is true, only the first cache loader is used; the rest are
ignored -->
<loader
class="org.jboss.cache.loader.JDBCCacheLoader"
async="false"
fetchPersistentState="true"
ignoreModifications="false"
purgeOnStartup="false">
<properties>
cache.jdbc.table.name=jbosscache
cache.jdbc.table.create=true
cache.jdbc.table.drop=false
cache.jdbc.table.primarykey=jbosscache_pkey
cache.jdbc.fqn.column=fqn
cache.jdbc.fqn.type=VARCHAR(255)
cache.jdbc.node.column=node
cache.jdbc.node.type=bytea
cache.jdbc.parent.column=parent
cache.jdbc.driver=org.postgresql.Driver
cache.jdbc.url=jdbc:postgresql:testdb
cache.jdbc.user=+deleted+
cache.jdbc.password=+deleted+
</properties>
</loader>
</loaders>
And finally, the stack trace back to my call:
java.lang.NullPointerException
at org.jboss.cache.loader.ClusteredCacheLoader.exists(ClusteredCacheLoader.java:212)
at
org.jboss.cache.loader.AbstractDelegatingCacheLoader.exists(AbstractDelegatingCacheLoader.java:94)
at org.jboss.cache.loader.ChainingCacheLoader.exists(ChainingCacheLoader.java:128)
at
org.jboss.cache.interceptors.CacheLoaderInterceptor.loadIfNeeded(CacheLoaderInterceptor.java:311)
at
org.jboss.cache.interceptors.CacheLoaderInterceptor.visitGetNodeCommand(CacheLoaderInterceptor.java:176)
at org.jboss.cache.commands.read.GetNodeCommand.acceptVisitor(GetNodeCommand.java:76)
at
org.jboss.cache.interceptors.base.CommandInterceptor.invokeNextInterceptor(CommandInterceptor.java:116)
at
org.jboss.cache.interceptors.base.CommandInterceptor.handleDefault(CommandInterceptor.java:131)
at
org.jboss.cache.commands.AbstractVisitor.visitGetNodeCommand(AbstractVisitor.java:115)
at org.jboss.cache.commands.read.GetNodeCommand.acceptVisitor(GetNodeCommand.java:76)
at
org.jboss.cache.interceptors.base.CommandInterceptor.invokeNextInterceptor(CommandInterceptor.java:116)
at
org.jboss.cache.interceptors.base.CommandInterceptor.handleDefault(CommandInterceptor.java:131)
at
org.jboss.cache.commands.AbstractVisitor.visitGetNodeCommand(AbstractVisitor.java:115)
at org.jboss.cache.commands.read.GetNodeCommand.acceptVisitor(GetNodeCommand.java:76)
at
org.jboss.cache.interceptors.base.CommandInterceptor.invokeNextInterceptor(CommandInterceptor.java:116)
at
org.jboss.cache.interceptors.TxInterceptor.attachGtxAndPassUpChain(TxInterceptor.java:301)
at org.jboss.cache.interceptors.TxInterceptor.handleDefault(TxInterceptor.java:283)
at
org.jboss.cache.commands.AbstractVisitor.visitGetNodeCommand(AbstractVisitor.java:115)
at org.jboss.cache.commands.read.GetNodeCommand.acceptVisitor(GetNodeCommand.java:76)
at
org.jboss.cache.interceptors.base.CommandInterceptor.invokeNextInterceptor(CommandInterceptor.java:116)
at
org.jboss.cache.interceptors.base.CommandInterceptor.handleDefault(CommandInterceptor.java:131)
at
org.jboss.cache.commands.AbstractVisitor.visitGetNodeCommand(AbstractVisitor.java:115)
at org.jboss.cache.commands.read.GetNodeCommand.acceptVisitor(GetNodeCommand.java:76)
at
org.jboss.cache.interceptors.base.CommandInterceptor.invokeNextInterceptor(CommandInterceptor.java:116)
at
org.jboss.cache.interceptors.InvocationContextInterceptor.handleAll(InvocationContextInterceptor.java:178)
at
org.jboss.cache.interceptors.InvocationContextInterceptor.handleDefault(InvocationContextInterceptor.java:130)
at
org.jboss.cache.commands.AbstractVisitor.visitGetNodeCommand(AbstractVisitor.java:115)
at org.jboss.cache.commands.read.GetNodeCommand.acceptVisitor(GetNodeCommand.java:76)
at org.jboss.cache.interceptors.InterceptorChain.invoke(InterceptorChain.java:287)
at
org.jboss.cache.invocation.CacheInvocationDelegate.getNode(CacheInvocationDelegate.java:494)
at
org.jboss.cache.invocation.NodeInvocationDelegate.getChild(NodeInvocationDelegate.java:361)
at
org.jboss.cache.invocation.NodeInvocationDelegate.*addChild*(NodeInvocationDelegate.java:330)
at com.whatever.configuration.initCache(configuration.java:134)
Anyone run into anything like this before?
I can't imagine it is the configuration of the ClusteredCacheLoader, that's pretty
straight forward.
Thanks for any input,
Jamie
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