Hi friends,

I am new on jbpm with so much problems!!!

I want to use jbpm on my gwt project  and mysql.

I get error when I want to create EntityManagerFactory:

avax.persistence.PersistenceException: [PersistenceUnit: org.jbpm.persistence.jpa] Unable to build EntityManagerFactory

    at org.hibernate.ejb.Ejb3Configuration.buildEntityManagerFactory(Ejb3Configuration.java:677)

    at org.hibernate.ejb.HibernatePersistence.createEntityManagerFactory(HibernatePersistence.java:126)

    at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:51)

    at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:33)

    at com.ayriksoft.desktopapp.server.TaskServiceManager.getInstance(TaskServiceManager.java:319)

    at com.ayriksoft.desktopapp.server.JBPMServiceImpl.setup(JBPMServiceImpl.java:116)

    at com.ayriksoft.desktopapp.server.JBPMServiceImpl.initializeJbpmSession(JBPMServiceImpl.java:51)

    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:597)

    at com.google.gwt.user.server.rpc.RPC.invokeAndEncodeResponse(RPC.java:561)

    at com.google.gwt.user.server.rpc.RemoteServiceServlet.processCall(RemoteServiceServlet.java:208)

    at com.google.gwt.user.server.rpc.RemoteServiceServlet.processPost(RemoteServiceServlet.java:248)

    at com.google.gwt.user.server.rpc.AbstractRemoteServiceServlet.doPost(AbstractRemoteServiceServlet.java:62)

    at javax.servlet.http.HttpServlet.service(HttpServlet.java:647)

    at javax.servlet.http.HttpServlet.service(HttpServlet.java:728)

    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)

    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)

    at org.netbeans.modules.web.monitor.server.MonitorFilter.doFilter(MonitorFilter.java:393)

    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)

    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)

    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222)

    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)

    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)

    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)

    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99)

    at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:936)

    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)

    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:407)

    at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1004)

    at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589)

    at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:312)

    at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)

    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)

    at java.lang.Thread.run(Thread.java:619)

Caused by: org.hibernate.HibernateException: Could not obtain BTM transaction manager instance

    at org.hibernate.transaction.BTMTransactionManagerLookup.getTransactionManager(BTMTransactionManagerLookup.java:50)

    at org.hibernate.impl.SessionFactoryImpl.<init>(SessionFactoryImpl.java:367)

    at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1341)

    at org.hibernate.cfg.AnnotationConfiguration.buildSessionFactory(AnnotationConfiguration.java:867)

    at org.hibernate.ejb.Ejb3Configuration.buildEntityManagerFactory(Ejb3Configuration.java:669)

    ... 35 more

Caused by: java.lang.reflect.InvocationTargetException

    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:597)

    at org.hibernate.transaction.BTMTransactionManagerLookup.getTransactionManager(BTMTransactionManagerLookup.java:47)

    ... 39 more

Caused by: bitronix.tm.utils.InitializationException: initialization failed, cannot safely start the transaction manager

    at bitronix.tm.BitronixTransactionManager.<init>(BitronixTransactionManager.java:79)

    at bitronix.tm.TransactionManagerServices.getTransactionManager(TransactionManagerServices.java:62)

    ... 44 more

Caused by: java.nio.channels.OverlappingFileLockException

    at sun.nio.ch.FileChannelImpl$SharedFileLockTable.checkList(FileChannelImpl.java:1176)

    at sun.nio.ch.FileChannelImpl$SharedFileLockTable.add(FileChannelImpl.java:1078)

    at sun.nio.ch.FileChannelImpl.tryLock(FileChannelImpl.java:878)

    at bitronix.tm.journal.TransactionLogAppender.<init>(TransactionLogAppender.java:70)

    at bitronix.tm.journal.DiskJournal.open(DiskJournal.java:151)

    at bitronix.tm.BitronixTransactionManager.<init>(BitronixTransactionManager.java:62)

    ... 45 more

I attach My gwtService class called JBPMServiceImpl.java and TaskServiceManager.java  and persistence.xml

I appreciate if any one can help me please....