JBossCache in Tomcat w/ Transaction Support
Hi,
I am currently evaluating JBossCache for my company. For our purposes we will need to use JBossCache inside of Tomcact. For transaction support I have added the JOTM jar files and used the configuration example from the JOTM docs. In the JBossCache config file I set the JBossTransactionManagerLookup class to org.jboss.cache.GenericTransactionManagerLookup which seems to work fine. I have two instances of tomcat on the same machine for my environment. When I put objects into the tree with the following code
try {
ut.begin();
tree.put(node,currentCount,item);
ut.commit();
} catch(Exception e){
log.error("Error adding to cache",e);
try{
ut.rollback();
}catch(Exception e2){}
}finally{
//sets ThreadLocal treeCache varible to null
TreeCacheUtil.closeTreeCacheSession();
//sets ThreadLocal transaction varible to null
UserTransactionUtil.transactionDone();
tree=null;
ut=null;
}from node 1 I get the following error on node 2
org.jboss.util.NestedRuntimeException: ; - nested throwable: (java.lang.Exception: method call _put cannot be converted to a modification) at org.jboss.cache.interceptors.CacheStoreInterceptor$SynchronizationHandler.beforeCompletion(CacheStoreInterceptor.java:236) at org.objectweb.jotm.SubCoordinator.doBeforeCompletion(SubCoordinator.java:1078) at org.objectweb.jotm.SubCoordinator.commit_one_phase(SubCoordinator.java:375) at org.objectweb.jotm.TransactionImpl.commit(TransactionImpl.java:219) at org.jboss.cache.interceptors.ReplicationInterceptor.replicate(ReplicationInterceptor.java:182) at org.jboss.cache.TreeCache._replicate(TreeCache.java:2679) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:324) at org.jgroups.blocks.MethodCall.invoke(MethodCall.java:236) at org.jgroups.blocks.RpcDispatcher.handle(RpcDispatcher.java:220) at org.jgroups.blocks.RequestCorrelator.handleRequest(RequestCorrelator.java:615) at org.jgroups.blocks.RequestCorrelator.receiveMessage(RequestCorrelator.java:512) at org.jgroups.blocks.RequestCorrelator.receive(RequestCorrelator.java:326) at org.jgroups.blocks.MessageDispatcher$ProtocolAdapter.handleUp(MessageDispatcher.java:722) at org.jgroups.blocks.MessageDispatcher$ProtocolAdapter.access$300(MessageDispatcher.java:554) at org.jgroups.blocks.MessageDispatcher$1.run(MessageDispatcher.java:691) at java.lang.Thread.run(Thread.java:534) Caused by: java.lang.Exception: method call _put cannot be converted to a modification at org.jboss.cache.interceptors.CacheStoreInterceptor.convertMethodCallToModification(CacheStoreInterceptor.java:192) at org.jboss.cache.interceptors.CacheStoreInterceptor.prepareCacheLoader(CacheStoreInterceptor.java:144) at org.jboss.cache.interceptors.CacheStoreInterceptor.access$000(CacheStoreInterceptor.java:22) at org.jboss.cache.interceptors.CacheStoreInterceptor$SynchronizationHandler.beforeCompletion(CacheStoreInterceptor.java:222) ... 18 more 2005-02-22 12:46:37,781 DEBUG http-8080-Processor25 treecache.util.TreeCacheUtil - treecache null, setting to instance 2005-02-22 12:46:52,796 ERROR http-8080-Processor25 org.jboss.cache.lock.IdentityLock - read lock for /treecache/pojo/Item could not be acquired after 15000 ms. Lock map ownership Read lock owners: [] Write lock owner: <172.30.3.123:7805>:2 (caller=Thread[http-8080-Processor25,5,main]) 2005-02-22 12:46:52,796 DEBUG http-8080-Processor25 org.jboss.cache.Node - failure acquiring lock: fqn=/treecache/pojo/Item, requester=Thread[http-8080-Processor25,5,main], lock=write owner=<172.30.3.123:7805>:2 2005-02-22 12:46:52,796 ERROR http-8080-Processor25 treecache.servlets.ViewNodesServlet - Error retreiving nodes from tree org.jboss.cache.lock.TimeoutException: lock for /treecache/pojo/Item could not be acquired after 15000ms. Lock map ownership Read lock owners: [] Write lock owner: <172.30.3.123:7805>:2 at org.jboss.cache.lock.IdentityLock.acquireReadLock(IdentityLock.java:227) at org.jboss.cache.Node.acquireReadLock(Node.java:418) at org.jboss.cache.Node.acquire(Node.java:399) at org.jboss.cache.interceptors.LockInterceptor.lock(LockInterceptor.java:187) at org.jboss.cache.interceptors.LockInterceptor.invoke(LockInterceptor.java:134) at org.jboss.cache.interceptors.Interceptor.invoke(Interceptor.java:40) at org.jboss.cache.interceptors.CreateIfNotExistsInterceptor.invoke(CreateIfNotExistsInterceptor.java:47) at org.jboss.cache.interceptors.Interceptor.invoke(Interceptor.java:40) at org.jboss.cache.interceptors.CacheStoreInterceptor.invoke(CacheStoreInterceptor.java:103) at org.jboss.cache.interceptors.Interceptor.invoke(Interceptor.java:40) at org.jboss.cache.interceptors.CacheLoaderInterceptor.invoke(CacheLoaderInterceptor.java:111) at org.jboss.cache.interceptors.Interceptor.invoke(Interceptor.java:40) at org.jboss.cache.interceptors.ReplicationInterceptor.invoke(ReplicationInterceptor.java:51) at org.jboss.cache.TreeCache.invokeMethod(TreeCache.java:3078) at org.jboss.cache.TreeCache.getKeys(TreeCache.java:1559) at org.jboss.cache.TreeCache.getKeys(TreeCache.java:1548) at treecache.servlets.ViewNodesServlet.doPost(Unknown Source) at treecache.servlets.ViewNodesServlet.doGet(Unknown Source) at javax.servlet.http.HttpServlet.service(HttpServlet.java:689) at javax.servlet.http.HttpServlet.service(HttpServlet.java:802) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:237) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:157) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:214) at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104) at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520) at org.apache.catalina.core.StandardContextValve.invokeInternal(StandardContextValve.java:198) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:152) at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104) at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:137) at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:118) at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:102) at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109) at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104) at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520) at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:929) at org.apache.coyote.tomcat5.CoyoteAdapter.service(CoyoteAdapter.java:160) at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:799) at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:705) at org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:577) at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:683)
Any ideas on why this is happening? If I comment out the TransactionManagerLookupClass section performance is fine.
Thanks,
Bill
