11 Replies Latest reply on Jun 9, 2013 8:51 AM by vinay_

jBPM5.1 : Setting Process Variable from code(Using API)

sandeepsapra Nov 10, 2011 12:47 PM

Description :

I am trying to create a business process having two tasks :

a) Enter Comments Task to be entered by author and

b) Verify comments Task : To approve or reject comments entered by author.

If the comments are approved the process will end and if it is rejected , control will flow back to user task to enter comments by author.

Approve is set in BPMN by setting a process variable : approvalStatus as 1 and for reject it i set to 0.

Eg:

return approvalStatus.equals("1");

</conditionExpression>

Problem:

While starting the process, approvalStatus is set to 0 intially as :

Map<String, Object> params = new HashMap<String, Object>();

params.put("approvalStatus", "0");

// start a new process instance

pi = ksession.startProcess("com.sample.bpmn.comments",params);

I am then trying to set the process variable as 1 or 0 (depending on approve or reject) inside the code , but the same is not happening.

Can anyone please tell if I am missing something or is there any other way to do so?

Code Snippet:

//Some Code here.....................

String approvalStatusValue="0";

if(isCommentsApproved)

approvalStatusValue="1";

else

approvalStatusValue="0";

Map<String, Object> results = new HashMap<String, Object>();

results.put("approvalStatus", approvalStatusValue);

ContentData contentData = new ContentData();

contentData = new ContentData();

contentData.setAccessType(AccessType.Inline);

ByteArrayOutputStream bos = new ByteArrayOutputStream();

ObjectOutputStream out;

try {

out = new ObjectOutputStream(bos);

out.writeObject(results);

out.close();

contentData = new ContentData();

contentData.setContent(bos.toByteArray());

contentData.setAccessType(AccessType.Inline);

} catch (IOException e) {

e.printStackTrace();

}

taskClient.complete(task1.getId(), "mary", contentData, taskOperationHandler);

Thanks and Regards,

Sandeep

1. Re: jBPM5.1 : Setting Process Variable from code(Using API)

swiderski.maciej Nov 14, 2011 2:25 PM (in response to sandeepsapra)

What work item handler do you use for Human Task? Handler should be responsible for transferring content data into output definition of the user task.
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2. Re: jBPM5.1 : Setting Process Variable from code(Using API)

eaa Nov 15, 2011 2:19 AM (in response to sandeepsapra)

Are you mapping the result of the Human Task Node to the process variable you want to change?
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3. Re: jBPM5.1 : Setting Process Variable from code(Using API)

sandeepsapra Nov 16, 2011 2:26 AM (in response to sandeepsapra)

Thanks Maciej Swiderski and Esteban Aliverti for responding to my problem. I have solved the problem by setting
Result Mapping for the user task ( {Result=approvalStatus} ) , along with defining the process variable, for which I was not aware of earlier.

But now I have an another query, where in I am trying to execute my bpmn in a web application and I have followed the steps give in the following articles.
Article 1: http://community.jboss.org/people/bpmn2user/blog/2011/09/21/jbpm5-web-example
Article 2: http://community.jboss.org/people/bpmn2user/blog/2011/04/03/jbpm5-human-task-api-usage-example

Desc: I have multiple user tasks in my bpmn , and after completing one user task it should go to the other user task and so on.

Problem : Once I run the code ( using all the configuration told in the article), the human task view shows the user task to first user as reserved,but after starting and completing it , the workflow ends and hence searching for tasks to other users shows nothing.

I tried the same using APIs also but the same problem comes.
Could you please suggest where I am wrong?

Regards,
Sandeep
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4. Re: jBPM5.1 : Setting Process Variable from code(Using API)

eaa Nov 16, 2011 4:37 AM (in response to sandeepsapra)

Which process definition are you using?
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5. Re: jBPM5.1 : Setting Process Variable from code(Using API)

sandeepsapra Nov 16, 2011 6:07 AM (in response to eaa)

Hi Esteban,
I am using the BPMN2.
Also while running the example given in the article(http://community.jboss.org/people/bpmn2user/blog/2011/09/21/jbpm5-web-example) and running in tomcat 6.0 with eclipse , I am getting following error( stacktrace below).
I have done all the configurations stated in the example.

Could you help me for the same?

Regards
Sandeep

StackTrace:
2532 [main] INFO bitronix.tm.Configuration - JVM unique ID: <172.21.232.59>
Nov 16, 2011 4:32:52 PM org.apache.naming.NamingContext lookup
WARNING: Unexpected exception resolving reference
bitronix.tm.utils.InitializationException: cannot open disk journal
at bitronix.tm.BitronixTransactionManager.<init>(BitronixTransactionManager.java:61)
at bitronix.tm.TransactionManagerServices.getTransactionManager(TransactionManagerServices.java:43)
at bitronix.tm.BitronixTransactionManagerObjectFactory.getObjectInstance(BitronixTransactionManagerObjectFactory.java:29)
at org.apache.naming.factory.TransactionFactory.getObjectInstance(TransactionFactory.java:110)
at javax.naming.spi.NamingManager.getObjectInstance(NamingManager.java:304)
at org.apache.naming.NamingContext.lookup(NamingContext.java:793)
at org.apache.naming.NamingContext.lookup(NamingContext.java:140)
at org.apache.naming.NamingContext.lookup(NamingContext.java:781)
at org.apache.naming.NamingContext.lookup(NamingContext.java:153)
at org.apache.naming.SelectorContext.lookup(SelectorContext.java:152)
at javax.naming.InitialContext.lookup(InitialContext.java:392)
at com.sample.processserver.TaskProcessServlet.init(TaskProcessServlet.java:67)
at javax.servlet.GenericServlet.init(GenericServlet.java:212)
at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1173)
at org.apache.catalina.core.StandardWrapper.load(StandardWrapper.java:993)
at org.apache.catalina.core.StandardContext.loadOnStartup(StandardContext.java:4420)
at org.apache.catalina.core.StandardContext.start(StandardContext.java:4733)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1053)
at org.apache.catalina.core.StandardHost.start(StandardHost.java:840)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1053)
at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:463)
at org.apache.catalina.core.StandardService.start(StandardService.java:525)
at org.apache.catalina.core.StandardServer.start(StandardServer.java:754)
at org.apache.catalina.startup.Catalina.start(Catalina.java:595)
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.apache.catalina.startup.Bootstrap.start(Bootstrap.java:289)
at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:414)
Caused by: java.io.IOException: The process cannot access the file because another process has locked a portion of the file
at java.io.RandomAccessFile.read(Native Method)
at java.io.RandomAccessFile.readInt(RandomAccessFile.java:720)
at bitronix.tm.journal.TransactionLogHeader.<init>(TransactionLogHeader.java:77)
at bitronix.tm.journal.TransactionLogAppender.<init>(TransactionLogAppender.java:49)
at bitronix.tm.journal.DiskJournal.open(DiskJournal.java:131)
at bitronix.tm.BitronixTransactionManager.<init>(BitronixTransactionManager.java:47)
... 29 more
2011-11-16 16:32:52,391 (TaskProcessServlet.java:82) ERROR com.sample.processserver.TaskProcessServlet - cannot open disk journal
Nov 16, 2011 4:32:52 PM org.apache.catalina.core.ApplicationContext log
SEVERE: StandardWrapper.Throwable
java.lang.RuntimeException: error while creating session
at com.sample.processserver.TaskProcessServlet.init(TaskProcessServlet.java:83)
at javax.servlet.GenericServlet.init(GenericServlet.java:212)
at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1173)
at org.apache.catalina.core.StandardWrapper.load(StandardWrapper.java:993)
at org.apache.catalina.core.StandardContext.loadOnStartup(StandardContext.java:4420)
at org.apache.catalina.core.StandardContext.start(StandardContext.java:4733)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1053)
at org.apache.catalina.core.StandardHost.start(StandardHost.java:840)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1053)
at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:463)
at org.apache.catalina.core.StandardService.start(StandardService.java:525)
at org.apache.catalina.core.StandardServer.start(StandardServer.java:754)
at org.apache.catalina.startup.Catalina.start(Catalina.java:595)
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.apache.catalina.startup.Bootstrap.start(Bootstrap.java:289)
at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:414)
Caused by: javax.naming.NamingException: cannot open disk journal
at org.apache.naming.NamingContext.lookup(NamingContext.java:805)
at org.apache.naming.NamingContext.lookup(NamingContext.java:140)
at org.apache.naming.NamingContext.lookup(NamingContext.java:781)
at org.apache.naming.NamingContext.lookup(NamingContext.java:153)
at org.apache.naming.SelectorContext.lookup(SelectorContext.java:152)
at javax.naming.InitialContext.lookup(InitialContext.java:392)
at com.sample.processserver.TaskProcessServlet.init(TaskProcessServlet.java:67)
... 18 more
Nov 16, 2011 4:32:52 PM org.apache.catalina.core.StandardContext loadOnStartup
SEVERE: Servlet /jbpm5webexample threw load() exception
javax.naming.NamingException: cannot open disk journal
at org.apache.naming.NamingContext.lookup(NamingContext.java:805)
at org.apache.naming.NamingContext.lookup(NamingContext.java:140)
at org.apache.naming.NamingContext.lookup(NamingContext.java:781)
at org.apache.naming.NamingContext.lookup(NamingContext.java:153)
at org.apache.naming.SelectorContext.lookup(SelectorContext.java:152)
at javax.naming.InitialContext.lookup(InitialContext.java:392)
at com.sample.processserver.TaskProcessServlet.init(TaskProcessServlet.java:67)
at javax.servlet.GenericServlet.init(GenericServlet.java:212)
at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1173)
at org.apache.catalina.core.StandardWrapper.load(StandardWrapper.java:993)
at org.apache.catalina.core.StandardContext.loadOnStartup(StandardContext.java:4420)
at org.apache.catalina.core.StandardContext.start(StandardContext.java:4733)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1053)
at org.apache.catalina.core.StandardHost.start(StandardHost.java:840)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1053)
at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:463)
at org.apache.catalina.core.StandardService.start(StandardService.java:525)
at org.apache.catalina.core.StandardServer.start(StandardServer.java:754)
at org.apache.catalina.startup.Catalina.start(Catalina.java:595)
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.apache.catalina.startup.Bootstrap.start(Bootstrap.java:289)
at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:414)
Nov 16, 2011 4:32:52 PM org.apache.coyote.http11.Http11Protocol start
INFO: Starting Coyote HTTP/1.1 on http-8080
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6. Re: jBPM5.1 : Setting Process Variable from code(Using API)

swiderski.maciej Nov 16, 2011 3:45 PM (in response to sandeepsapra)

The exception seems to be caused by another process that is keeping lock on the bitronix log file...

The best way for us to help you is if you provide a test case that will give us opportunity to quickly reproduce the problem, so could do so?
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7. Re: jBPM5.1 : Setting Process Variable from code(Using API)

qintao1203 Nov 17, 2011 4:49 AM (in response to sandeepsapra)

You should delete jta.jar and btm.jar in your application to solve [cannot open disk journal]

Or delete btm's datasources or Transaction in spring
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8. Re: jBPM5.1 : Setting Process Variable from code(Using API)

sandeepsapra Nov 17, 2011 6:18 AM (in response to qintao1203)

Thanks Jack
I solved the problem and later I checked your response. Along with jta.jar and btm.jar,sl4j jar has to removed and should be present in tomcat lib.

1.) I am trying to run my example in JBoss AS (5.0.0 GA) now but I am not sure how to do configurations in JBoss.
Could anyone give some reference?

2.) When I tried doing an error occured saying :
java.lang.RuntimeException: Specification violation [EJB3 JPA 6.2.1.2] - You have not defined a jta-data-source for a JTA enabled persistence context named: org.jbpm.task
at org.jboss.jpa.deployment.PersistenceUnitInfoImpl.<init>(PersistenceUnitInfoImpl.java:115)
at org.jboss.jpa.deployment.PersistenceUnitDeployment.start(PersistenceUnitDeployment.java:285)

I changed following in persistence.xml as
Before
......

<persistence-unit name="org.jbpm.task">

<provider>org.hibernate.ejb.HibernatePersistence</provider>

<jta-data-source>java:jdbc/testDS1</jta-data-source>

<class>org.jbpm.task.Attachment</class>

<class>org.jbpm.task.Content</class>

..........

After changes :
......

<persistence-unit name="org.jbpm.task">

<provider>org.hibernate.ejb.HibernatePersistence</provider>

<jta-data-source>java:jdbc/testDS1</jta-data-source>

<class>org.jbpm.task.Attachment</class>

<class>org.jbpm.task.Content</class>
..........

But now error is coming as
java.lang.ClassCastException

: org.hibernate.ejb.HibernatePersistence cannot be cast to javax.persistence.spi.PersistenceProvider
at org.jboss.jpa.deployment.PersistenceUnitDeployment.start(PersistenceUnitDeployment.java:310)
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.jboss.reflect.plugins.introspection.ReflectionUtils.invoke(ReflectionUtils.java:59)
at org.jboss.reflect.plugins.introspection.ReflectMethodInfoImpl.invoke(ReflectMethodInfoImpl.java:150)

Could anyone suggest what went wrong and how to solve it?

PS: I am using the example in article : http://community.jboss.org/people/bpmn2user/blog/2011/09/21/jbpm5-web-example but doing the same configuration Jboss 5.0.0 GA now

Thanks and Regards,
Sandeep
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9. Re: jBPM5.1 : Setting Process Variable from code(Using API)

sandeepsapra Nov 21, 2011 1:54 AM (in response to sandeepsapra)

Problem resolved.
1.) Class Loader should be set in way that libraries are picked from WEB-INF/lib first.
2.) jboss-classloading.xml is required

Thanks and Regards,
Sandeep Sapra
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10. Re: jBPM5.1 : Setting Process Variable from code(Using API)

gigazhang May 27, 2012 10:28 PM (in response to qintao1203)

That's the problem.Tks!
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11. Re: jBPM5.1 : Setting Process Variable from code(Using API)

vinay_ Jun 9, 2013 8:51 AM (in response to sandeepsapra)

Hi All ,

I am getting this error....
SLF4J: Class path contains multiple SLF4J bindings.
SLF4J: Found binding in [jar:file:/C:/Program%20Files%20(x86)/Apache%20Software%20Foundation/Tomcat%207.0/lib/slf4j-jdk14-1.6.4.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: Found binding in [jar:file:/F:/IPMS_Workspace_New/.metadata/.plugins/org.eclipse.wst.server.core/tmp1/wtpwebapps/jbpmWebExm/WEB-INF/lib/slf4j-jdk14-1.6.4.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: See http://www.slf4j.org/codes.html#multiple_bindings for an explanation.
9 Jun, 2013 6:11:15 PM bitronix.tm.BitronixTransactionManager logVersion
INFO: Bitronix Transaction Manager version 2.1.3
9 Jun, 2013 6:11:15 PM bitronix.tm.Configuration buildServerIdArray
WARNING: cannot get this JVM unique ID. Make sure it is configured and you only use ASCII characters. Will use IP address instead (unsafe for production usage!).
9 Jun, 2013 6:11:15 PM bitronix.tm.Configuration buildServerIdArray
INFO: JVM unique ID: <172.16.6.139>
2013-06-09 18:11:15,774 (TaskProcessServlet.java:56) ERROR com.sample.processserver.TaskProcessServlet - [PersistenceUnit: org.jbpm.persistence.jpa] Unable to build EntityManagerFactory
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:325)
          at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1300)
          at org.hibernate.cfg.AnnotationConfiguration.buildSessionFactory(AnnotationConfiguration.java:859)
          at org.hibernate.ejb.Ejb3Configuration.buildEntityManagerFactory(Ejb3Configuration.java:669)
          at org.hibernate.ejb.HibernatePersistence.createEntityManagerFactory(HibernatePersistence.java:126)
          at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:52)
          at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:34)
          at com.sample.processserver.JbpmAPIUtil.createSession(JbpmAPIUtil.java:262)
          at com.sample.processserver.JbpmAPIUtil.getSession(JbpmAPIUtil.java:242)
          at com.sample.processserver.TaskProcessServlet.init(TaskProcessServlet.java:44)
          at javax.servlet.GenericServlet.init(GenericServlet.java:160)
          at org.apache.catalina.core.StandardWrapper.initServlet(StandardWrapper.java:1266)
          at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1185)
          at org.apache.catalina.core.StandardWrapper.load(StandardWrapper.java:1080)
          at org.apache.catalina.core.StandardContext.loadOnStartup(StandardContext.java:5001)
          at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5289)
          at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
          at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1525)
          at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1515)
          at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
          at java.util.concurrent.FutureTask.run(FutureTask.java:138)
          at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
          at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
          at java.lang.Thread.run(Thread.java:662)
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)
          ... 24 more
Caused by: bitronix.tm.utils.InitializationException: cannot open disk journal
          at bitronix.tm.BitronixTransactionManager.<init>(BitronixTransactionManager.java:98)
          at bitronix.tm.TransactionManagerServices.getTransactionManager(TransactionManagerServices.java:75)
          ... 29 more
Caused by: java.io.IOException: The process cannot access the file because another process has locked a portion of the file
          at sun.nio.ch.FileDispatcher.read0(Native Method)
          at sun.nio.ch.FileDispatcher.read(FileDispatcher.java:28)
          at sun.nio.ch.IOUtil.readIntoNativeBuffer(IOUtil.java:198)
          at sun.nio.ch.IOUtil.read(IOUtil.java:171)
          at sun.nio.ch.FileChannelImpl.read(FileChannelImpl.java:144)
          at bitronix.tm.journal.TransactionLogHeader.<init>(TransactionLogHeader.java:101)
          at bitronix.tm.journal.TransactionLogAppender.<init>(TransactionLogAppender.java:70)
          at bitronix.tm.journal.DiskJournal.open(DiskJournal.java:157)
          at bitronix.tm.BitronixTransactionManager.<init>(BitronixTransactionManager.java:85)
          ... 30 more
9 Jun, 2013 6:11:15 PM org.apache.catalina.core.ApplicationContext log
SEVERE: StandardWrapper.Throwable
java.lang.RuntimeException: error while creating session
          at com.sample.processserver.TaskProcessServlet.init(TaskProcessServlet.java:57)
          at javax.servlet.GenericServlet.init(GenericServlet.java:160)
          at org.apache.catalina.core.StandardWrapper.initServlet(StandardWrapper.java:1266)
          at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1185)
          at org.apache.catalina.core.StandardWrapper.load(StandardWrapper.java:1080)
          at org.apache.catalina.core.StandardContext.loadOnStartup(StandardContext.java:5001)
          at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5289)
          at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
          at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1525)
          at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1515)
          at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
          at java.util.concurrent.FutureTask.run(FutureTask.java:138)
          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:662)
Caused by: javax.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:52)
          at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:34)
          at com.sample.processserver.JbpmAPIUtil.createSession(JbpmAPIUtil.java:262)
          at com.sample.processserver.JbpmAPIUtil.getSession(JbpmAPIUtil.java:242)
          at com.sample.processserver.TaskProcessServlet.init(TaskProcessServlet.java:44)
          ... 14 more
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:325)
          at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1300)
          at org.hibernate.cfg.AnnotationConfiguration.buildSessionFactory(AnnotationConfiguration.java:859)
          at org.hibernate.ejb.Ejb3Configuration.buildEntityManagerFactory(Ejb3Configuration.java:669)
          ... 20 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)
          ... 24 more
Caused by: bitronix.tm.utils.InitializationException: cannot open disk journal
          at bitronix.tm.BitronixTransactionManager.<init>(BitronixTransactionManager.java:98)
          at bitronix.tm.TransactionManagerServices.getTransactionManager(TransactionManagerServices.java:75)
          ... 29 more
Caused by: java.io.IOException: The process cannot access the file because another process has locked a portion of the file
          at sun.nio.ch.FileDispatcher.read0(Native Method)
          at sun.nio.ch.FileDispatcher.read(FileDispatcher.java:28)
          at sun.nio.ch.IOUtil.readIntoNativeBuffer(IOUtil.java:198)
          at sun.nio.ch.IOUtil.read(IOUtil.java:171)
          at sun.nio.ch.FileChannelImpl.read(FileChannelImpl.java:144)
          at bitronix.tm.journal.TransactionLogHeader.<init>(TransactionLogHeader.java:101)
          at bitronix.tm.journal.TransactionLogAppender.<init>(TransactionLogAppender.java:70)
          at bitronix.tm.journal.DiskJournal.open(DiskJournal.java:157)
          at bitronix.tm.BitronixTransactionManager.<init>(BitronixTransactionManager.java:85)
          ... 30 more
9 Jun, 2013 6:11:15 PM org.apache.catalina.core.StandardContext loadOnStartup
SEVERE: Servlet /jbpmWebExm threw load() exception
java.io.IOException: The process cannot access the file because another process has locked a portion of the file
          at sun.nio.ch.FileDispatcher.read0(Native Method)
          at sun.nio.ch.FileDispatcher.read(FileDispatcher.java:28)
          at sun.nio.ch.IOUtil.readIntoNativeBuffer(IOUtil.java:198)
          at sun.nio.ch.IOUtil.read(IOUtil.java:171)
          at sun.nio.ch.FileChannelImpl.read(FileChannelImpl.java:144)
          at bitronix.tm.journal.TransactionLogHeader.<init>(TransactionLogHeader.java:101)
          at bitronix.tm.journal.TransactionLogAppender.<init>(TransactionLogAppender.java:70)
          at bitronix.tm.journal.DiskJournal.open(DiskJournal.java:157)
          at bitronix.tm.BitronixTransactionManager.<init>(BitronixTransactionManager.java:85)
          at bitronix.tm.TransactionManagerServices.getTransactionManager(TransactionManagerServices.java:75)
          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)
          at org.hibernate.impl.SessionFactoryImpl.<init>(SessionFactoryImpl.java:325)
          at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1300)
          at org.hibernate.cfg.AnnotationConfiguration.buildSessionFactory(AnnotationConfiguration.java:859)
          at org.hibernate.ejb.Ejb3Configuration.buildEntityManagerFactory(Ejb3Configuration.java:669)
          at org.hibernate.ejb.HibernatePersistence.createEntityManagerFactory(HibernatePersistence.java:126)
          at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:52)
          at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:34)
          at com.sample.processserver.JbpmAPIUtil.createSession(JbpmAPIUtil.java:262)
          at com.sample.processserver.JbpmAPIUtil.getSession(JbpmAPIUtil.java:242)
          at com.sample.processserver.TaskProcessServlet.init(TaskProcessServlet.java:44)
          at javax.servlet.GenericServlet.init(GenericServlet.java:160)
          at org.apache.catalina.core.StandardWrapper.initServlet(StandardWrapper.java:1266)
          at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1185)
          at org.apache.catalina.core.StandardWrapper.load(StandardWrapper.java:1080)
          at org.apache.catalina.core.StandardContext.loadOnStartup(StandardContext.java:5001)
          at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5289)
          at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
          at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1525)
          at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1515)
          at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
          at java.util.concurrent.FutureTask.run(FutureTask.java:138)
          at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
          at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
          at java.lang.Thread.run(Thread.java:662)
9 Jun, 2013 6:11:15 PM org.apache.coyote.AbstractProtocol start
INFO: Starting ProtocolHandler ["http-bio-8080"]
9 Jun, 2013 6:11:15 PM org.apache.coyote.AbstractProtocol start
INFO: Starting ProtocolHandler ["ajp-bio-8009"]
9 Jun, 2013 6:11:15 PM org.apache.catalina.startup.Catalina start
INFO: Server startup in 3438 ms
9 Jun, 2013 6:11:16 PM org.apache.catalina.core.StandardWrapperValve invoke
SEVERE: Servlet.service() for servlet [jsp] in context with path [/jbpmWebExm] threw exception [java.lang.LinkageError: loader constraint violation: when resolving interface method "javax.servlet.jsp.JspApplicationContext.getExpressionFactory()Ljavax/el/ExpressionFactory;" the class loader (instance of org/apache/jasper/servlet/JasperLoader) of the current class, org/apache/jsp/index_jsp, and the class loader (instance of org/apache/catalina/loader/StandardClassLoader) for resolved class, javax/servlet/jsp/JspApplicationContext, have different Class objects for the type javax/el/ExpressionFactory used in the signature] with root cause
java.lang.LinkageError: loader constraint violation: when resolving interface method "javax.servlet.jsp.JspApplicationContext.getExpressionFactory()Ljavax/el/ExpressionFactory;" the class loader (instance of org/apache/jasper/servlet/JasperLoader) of the current class, org/apache/jsp/index_jsp, and the class loader (instance of org/apache/catalina/loader/StandardClassLoader) for resolved class, javax/servlet/jsp/JspApplicationContext, have different Class objects for the type javax/el/ExpressionFactory used in the signature
          at org.apache.jsp.index_jsp._jspInit(index_jsp.java:31)
          at org.apache.jasper.runtime.HttpJspBase.init(HttpJspBase.java:49)
          at org.apache.jasper.servlet.JspServletWrapper.getServlet(JspServletWrapper.java:180)
          at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:369)
          at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:390)
          at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:334)
          at javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
          at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
          at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
          at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:224)
          at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:169)
          at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)
          at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:168)
          at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:98)
          at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:928)
          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:987)
          at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:539)
          at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:298)
          at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
          at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
          at java.lang.Thread.run(Thread.java:662)

my persistant.xml file :
<persistence-unit name="org.jbpm.persistence.jpa" transaction-type="JTA">
        <provider>org.hibernate.ejb.HibernatePersistence</provider>
        <jta-data-source>java:comp/env/jdbc/jbpm-ds</jta-data-source>

        
        <class>org.drools.persistence.info.SessionInfo</class>
        <class>org.jbpm.persistence.processinstance.ProcessInstanceInfo</class>
        <class>org.jbpm.persistence.processinstance.ProcessInstanceEventInfo</class>
        <class>org.drools.persistence.info.WorkItemInfo</class>
        <class>org.jbpm.process.audit.ProcessInstanceLog</class>
        <class>org.jbpm.process.audit.NodeInstanceLog</class>
        <class>org.jbpm.process.audit.VariableInstanceLog</class>

        <class>org.jbpm.task.Task</class>
                    <class>org.jbpm.task.Comment</class>
                    <class>org.jbpm.task.Attachment</class>
                    <class>org.jbpm.task.I18NText</class>
                    <class>org.jbpm.task.SubTasksStrategy</class>
                    <class>org.jbpm.task.Deadline</class>
                    <class>org.jbpm.task.Escalation</class>
                    <class>org.jbpm.task.Reassignment</class>
                    <class>org.jbpm.task.Notification</class>
                    <class>org.jbpm.task.BooleanExpression</class>
                    <class>org.jbpm.task.User</class>
                    <class>org.jbpm.task.PeopleAssignments</class>
        <properties>



            <property name="hibernate.dialect" value="org.hibernate.dialect.MySQLDialect"/>


            
            <property name="hibernate.connection.autocommit" value="false"/>
            <property name="hibernate.max_fetch_depth" value="3"/>
            <property name="hibernate.hbm2ddl.auto" value="update" />
            <property name="hibernate.show_sql" value="false" />
            <property name="hibernate.transaction.manager_lookup_class" value="org.hibernate.transaction.BTMTransactionManagerLookup"/>

        </properties>
               </persistence-unit>
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