jbmp error: failed to lazily initialize a collection

[bouskam]

Hello!
Im trying develop my own workflow with forms.
Everything fine with first form, but when the second form should displayed, i got jbmp error instead:

this happens on 3 different servers (Ive tried 6.3.1builds 8235 and 8230 and also 6.3.0)
May I do something wrong ? ( Im using Jboss studio 9 with the jBPM3 )

thank You for any advice!


and here is the code:
workflow:

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<?xml version="1.0" encoding="UTF-8"?>

<process-definition 
  xmlns="urn:jbpm.org:jpdl-3.2"
  name="simple">
   <start-state name="start">
		<transition to="task-node1"></transition>
	</start-state>
   <task-node name="task-node1">
		<task name="decision">
			<assignment actor-id="okmAdmin"></assignment>
		</task>
		<transition to="task-node2" name="krok2"></transition>
	</task-node>

	<task-node name="task-node2">
		<task name="review">
			<assignment actor-id="okmAdmin"></assignment>
		</task>
		<transition to="end" name="toend"></transition>
	</task-node>
   <end-state name="end"></end-state>
</process-definition>

and also the forms are very simple:

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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE workflow-forms PUBLIC "-//OpenKM//DTD Workflow Forms 2.1//EN" "http://www.openkm.com/dtd/workflow-forms-2.1.dtd">

<workflow-forms>
  <workflow-form task="decision">
    <input name="first" label="first" type="text" />
    <button name="submit" label="OK" />
  </workflow-form>
  <workflow-form task="review">
    <input name="second" label="second" type="text" />
    <button name="submit" label="OK" />
  </workflow-form>
</workflow-forms>

catalina.log with this error:

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2016-01-09 18:16:29,516 [http-bio-0.0.0.0-8080-exec-3] WARN  org.hibernate.engine.StatefulPersistenceContext.ProxyWarnLog- Narrowing proxy to class org.jbpm.graph.node.TaskNode - this operation breaks ==
2016-01-09 18:16:29,545 [http-bio-0.0.0.0-8080-exec-3] WARN  org.hibernate.engine.StatefulPersistenceContext.ProxyWarnLog- Narrowing proxy to class org.jbpm.graph.node.TaskNode - this operation breaks ==
2016-01-09 18:16:29,743 [http-bio-0.0.0.0-8080-exec-2] WARN  org.hibernate.engine.StatefulPersistenceContext.ProxyWarnLog- Narrowing proxy to class org.jbpm.graph.node.TaskNode - this operation breaks ==
2016-01-09 18:16:29,776 [http-bio-0.0.0.0-8080-exec-2] ERROR com.openkm.servlet.frontend.WorkflowServlet- failed to lazily initialize a collection of role: org.jbpm.bytes.ByteArray.byteBlocks, no session or session was closed
org.hibernate.LazyInitializationException: failed to lazily initialize a collection of role: org.jbpm.bytes.ByteArray.byteBlocks, no session or session was closed
	at org.hibernate.collection.AbstractPersistentCollection.throwLazyInitializationException(AbstractPersistentCollection.java:383)
	at org.hibernate.collection.AbstractPersistentCollection.throwLazyInitializationExceptionIfNotConnected(AbstractPersistentCollection.java:375)
	at org.hibernate.collection.AbstractPersistentCollection.initialize(AbstractPersistentCollection.java:368)
	at org.hibernate.collection.AbstractPersistentCollection.read(AbstractPersistentCollection.java:111)
	at org.hibernate.collection.PersistentList.hashCode(PersistentList.java:490)
	at org.jbpm.bytes.ByteArray.hashCode(ByteArray.java:113)
	at java.lang.Object.toString(Object.java:237)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:606)
	at org.hibernate.proxy.pojo.javassist.JavassistLazyInitializer.invoke(JavassistLazyInitializer.java:197)
	at org.jbpm.bytes.ByteArray_$$_javassist_85.toString(ByteArray_$$_javassist_85.java)
	at java.lang.String.valueOf(String.java:2854)
	at com.openkm.util.GWTUtil.copy(GWTUtil.java:635)
	at com.openkm.util.GWTUtil.copy(GWTUtil.java:597)
	at com.openkm.servlet.frontend.WorkflowServlet.findUserTaskInstances(WorkflowServlet.java:127)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:606)
	at com.google.gwt.user.server.rpc.RPC.invokeAndEncodeResponse(RPC.java:569)
	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:650)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:731)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
	at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
	at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:311)
	at org.springframework.security.web.access.intercept.FilterSecurityInterceptor.invoke(FilterSecurityInterceptor.java:116)
	at org.springframework.security.web.access.intercept.FilterSecurityInterceptor.doFilter(FilterSecurityInterceptor.java:83)
	at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:323)
	at org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:113)
	at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:323)
	at org.springframework.security.web.session.SessionManagementFilter.doFilter(SessionManagementFilter.java:101)
	at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:323)
	at org.springframework.security.web.authentication.AnonymousAuthenticationFilter.doFilter(AnonymousAuthenticationFilter.java:113)
	at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:323)
	at org.springframework.security.web.servletapi.SecurityContextHolderAwareRequestFilter.doFilter(SecurityContextHolderAwareRequestFilter.java:54)
	at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:323)
	at org.springframework.security.web.savedrequest.RequestCacheAwareFilter.doFilter(RequestCacheAwareFilter.java:45)
	at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:323)
	at org.springframework.security.web.authentication.AbstractAuthenticationProcessingFilter.doFilter(AbstractAuthenticationProcessingFilter.java:182)
	at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:323)
	at org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter(SecurityContextPersistenceFilter.java:87)
	at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:323)
	at org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:173)
	at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:346)
	at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:259)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:220)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122)
	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:505)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:170)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)
	at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:950)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:423)
	at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1079)
	at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:620)
	at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:318)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
	at java.lang.Thread.run(Thread.java:745)

and finaly the par file:
https://dl.dropboxusercontent.com/u/109859282/quo.par

[jllort]

At line 635 in GWTUtil class we have:

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if (obj instanceof FormElement) {
				variables.put(key, copy((FormElement) obj));
			} else {
				variables.put(key, String.valueOf(obj));
			}

In you case seems obj is not an instance of FormElement and is executing:

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variables.put(key, String.valueOf(obj));

What raises de the error.

Looking the form:

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<workflow-form task="review">
    <input name="second" label="second" type="text" />
    <button name="submit" label="OK" />
  </workflow-form>

Should be processed a FormElement but for some reason is not doing it. I suggest debug that line to understanding what kind of object is processing there.

[bouskam]

Hello,
I figued it out - it was the same problem, as desribed under http://forum.openkm.com/viewtopic.php?t=9025#p22382:

HSQL database will not store workflow session data, dont use it !!!

In my opinion, either is this a BUG, or it should be at least mentioned in Wiki and/or installation guide, that workflows will not work with HSQL. It would save me 3 days of labouring with jBPM, althougt the problem was on server.

[jllort]

Moving to MySQL did you solved the problem ?
What is strange for us is that you get something running or HSQL ?

[bouskam]

Yeh, migrating to MySQL solved that.
Im running low on RAM on workstation, so I dont want to run server locally together with Eclipse. Therefore is server deployed on other machine and it was installed from bundle, not compiled from source.
HSQL was not my choice, it was configured from installer. If there was a warning, that I should migrate to Mysql after install, I would do that. But I was not warned, so I left the default engine.

If I can have a wish, please let other people know, that they should avoid HSQL.
Such warning can be placed either at wiki/workflow courses, or at the last step of installer, or at workflows administration page... there are many possibilities..
Thank You!

[jllort]

We get your suggest and we will try doing something on that direction.

[pavila]

I've included a warning message in the workflow administration listing.