I'm using JBossCache 1.01 with Hibernate. The IsolationLevel I'm using is NONE. I got
this NPE:
2004-06-12 15:41:19,348 ERROR [UpHandler (GMS)] org.jboss.cache.TreeCache -
getState(): failed lock
ing
tree
java.lang.NullPointerException
at org.jboss.cache.lock.IdentityLock.acquireReadLock(IdentityLock.java:175)
at org.jboss.cache.Node.acquireReadLock(Node.java:346)
at org.jboss.cache.Node.acquire(Node.java:331)
at org.jboss.cache.Node.acquireAll(Node.java:370)
at
org.jboss.cache.TreeCache$MessageListenerAdaptor.getState(TreeCache.java:2438)
at
org.jgroups.blocks.MessageDispatcher$ProtocolAdapter.passUp(MessageDispatcher.java:576)
at org.jgroups.blocks.RequestCorrelator.receive(RequestCorrelator.java:322)
at
org.jgroups.blocks.MessageDispatcher$ProtocolAdapter.up(MessageDispatcher.java:638)
at org.jgroups.JChannel.up(JChannel.java:874)
at org.jgroups.stack.ProtocolStack.up(ProtocolStack.java:323)
at org.jgroups.stack.ProtocolStack.receiveUpEvent(ProtocolStack.java:339)
at org.jgroups.stack.Protocol.passUp(Protocol.java:489)
at org.jgroups.protocols.pbcast.STATE_TRANSFER.up(STATE_TRANSFER.java:102)
at org.jgroups.stack.Protocol.receiveUpEvent(Protocol.java:437)
at org.jgroups.stack.Protocol.passUp(Protocol.java:489)
at org.jgroups.protocols.pbcast.GMS.up(GMS.java:582)
at org.jgroups.stack.UpHandler.run(Protocol.java:60)
I had to add a class called LockStrategyNone. I guess this has been on the todo list
since there was a comment "FIXME Ben" in the source code of LockStrategyFactory:
| if (lockingLevel_ == null || lockingLevel_ == IsolationLevel.NONE)
| return null; // FIXME Ben !
|
I changed this to be:
| if (lockingLevel_ == null || lockingLevel_ == IsolationLevel.NONE)
| return new LockStrategyNone();
|
source code for LockStrategyNone :
/*
| * JBoss, the OpenSource J2EE webOS
| *
| * Distributable under LGPL license.
| * See terms of license at gnu.org.
| */
| package org.jboss.cache.lock;
|
| import EDU.oswego.cs.dl.util.concurrent.NullSync;
| import EDU.oswego.cs.dl.util.concurrent.Sync;
|
| /**
| * Transaction isolation level of None.
| *
| * @author Lari Hotari
| * @version $Revision$
| */
| public class LockStrategyNone implements LockStrategy
| {
| private NullSync nullLock_;
|
| public LockStrategyNone()
| {
| nullLock_ = new NullSync();
| }
|
| /**
| * @see org.jboss.cache.LockStrategy#readLock()
| */
| public Sync readLock()
| {
| return nullLock_;
| }
|
| /**
| * @see org.jboss.cache.LockStrategy#upgradeLockAttempt(long)
| */
| public Sync upgradeLockAttempt(long msecs)
| {
| return nullLock_;
| }
|
| /**
| * @see org.jboss.cache.LockStrategy#writeLock()
| */
| public Sync writeLock()
| {
| return nullLock_;
| }
| }
edited LockStrategyFactory :
| /*
| * JBoss, the OpenSource J2EE webOS
| *
| * Distributable under LGPL license.
| * See terms of license at gnu.org.
| */
| package org.jboss.cache.lock;
|
| /**
| * Factory to create LockStragtegy instance.
| *
| * @author Ben Wang
| */
| public class LockStrategyFactory
| {
| private static LockStrategyFactory s_me = null;
|
|
| /**
| * Transaction locking isolation level. Default.
| */
| private static IsolationLevel lockingLevel_ = IsolationLevel.REPEATABLE_READ;
|
| /**
| *
| */
| protected LockStrategyFactory()
| {
| }
|
| public static LockStrategyFactory getInstance()
| {
| if (s_me == null)
| s_me = new LockStrategyFactory();
|
| return s_me;
| }
|
| public LockStrategy getLockStrategy()
| {
| if (lockingLevel_ == null || lockingLevel_ == IsolationLevel.NONE)
| return new LockStrategyNone();
| if (lockingLevel_ == IsolationLevel.REPEATABLE_READ)
| return new LockStrategyRepeatableRead();
| if (lockingLevel_ == IsolationLevel.SERIALIZABLE)
| return new LockStrategySerializable();
| if (lockingLevel_ == IsolationLevel.READ_COMMITTED)
| return new LockStrategyReadCommitted();
| if (lockingLevel_ == IsolationLevel.READ_UNCOMMITTED)
| return new LockStrategyReadUncommitted();
| throw new RuntimeException("getLockStrategy: LockStrategy selection not
recognized." +
| " selection: " + lockingLevel_);
| }
|
| public static void setIsolationLevel(IsolationLevel level)
| {
| lockingLevel_ = level;
| }
|
| }
|
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http://www.jboss.org/index.html?module=bb&op=viewtopic&p=3838621#3838621
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http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&p=3838621
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