Reg : Error Binding Process Engine In Tomcat Server

[gkasinarayanan]

Hi All,

I'm trying to integrate gwt-console with my web application.
Currently i have initialised JBPM4 inside my web app and having it
in a static field.
PVM works independently with Oracle DB and custom config.
Followed by it,
I imported gwt-console and gwt-console-server war files into eclipse, deployed the projects in Tomcat Server, dependent jars are put in tomcat classpath and deployed the app in in the server.
I have disbaled the default security with gwt-server-console app and i'm able to navigate to the gwt console using below URL
(http://localhost:9090/gwt-console/org.jboss.bpm.console.Application/Application.html )

I get the following exception when i try to view the processes and tasks with the console.

The issue is GWT-Server app is not able to resolve the processengine context.
How to bind custom JBPM config inside server console app.
As i mentioned earlier i'm using tomcat not jboss.

The below is the stack trace of the exception.

org.jboss.resteasy.spi.UnhandledException: java.lang.IllegalStateException: Failed to load org.jboss.bpm.console.server.plugin.TaskDispatcherPlugin: org.jbpm.integration.console.forms.TaskDispatcherPluginImpl
at org.jboss.resteasy.core.SynchronousDispatcher.handleApplicationException(SynchronousDispatcher.java:319)
at org.jboss.resteasy.core.SynchronousDispatcher.handleException(SynchronousDispatcher.java:230)
at org.jboss.resteasy.core.SynchronousDispatcher.handleInvokerException(SynchronousDispatcher.java:206)
at org.jboss.resteasy.core.SynchronousDispatcher.invoke(SynchronousDispatcher.java:360)
at org.jboss.resteasy.core.SynchronousDispatcher.invoke(SynchronousDispatcher.java:173)
at org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher.service(HttpServletDispatcher.java:93)
at org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher.service(HttpServletDispatcher.java:68)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.jboss.bpm.console.server.util.GWTJsonFilter.doFilter(GWTJsonFilter.java:59)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:228)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:104)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:216)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:634)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:445)
at java.lang.Thread.run(Thread.java:619)
Caused by: java.lang.IllegalStateException: Failed to load org.jboss.bpm.console.server.plugin.TaskDispatcherPlugin: org.jbpm.integration.console.forms.TaskDispatcherPluginImpl
at org.jboss.bpm.console.server.util.ServiceLoader.loadFromServices(ServiceLoader.java:94)
at org.jboss.bpm.console.server.util.ServiceLoader.loadService(ServiceLoader.java:56)
at org.jboss.bpm.console.server.plugin.PluginMgr.load(PluginMgr.java:48)
at org.jboss.bpm.console.server.InfoFacade.getServerStatus(InfoFacade.java:65)
at org.jboss.bpm.console.server.InfoFacade.getServerInfo(InfoFacade.java:54)
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.resteasy.core.MethodInjectorImpl.invoke(MethodInjectorImpl.java:117)
at org.jboss.resteasy.core.ResourceMethod.invokeOnTarget(ResourceMethod.java:260)
at org.jboss.resteasy.core.ResourceMethod.invoke(ResourceMethod.java:232)
at org.jboss.resteasy.core.ResourceMethod.invoke(ResourceMethod.java:166)
at org.jboss.resteasy.core.DispatcherUtilities.getJaxrsResponse(DispatcherUtilities.java:142)
at org.jboss.resteasy.core.SynchronousDispatcher.invoke(SynchronousDispatcher.java:356)
... 19 more
Caused by: java.lang.RuntimeException: Failed to lookup process engine
at org.jbpm.integration.console.forms.TaskDispatcherPluginImpl.initializeProcessEngine(TaskDispatcherPluginImpl.java:247)
at org.jbpm.integration.console.forms.TaskDispatcherPluginImpl.(TaskDispatcherPluginImpl.java:61)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
at java.lang.Class.newInstance0(Class.java:355)
at java.lang.Class.newInstance(Class.java:308)
at org.jboss.bpm.console.server.util.ServiceLoader.loadFromServices(ServiceLoader.java:89)
... 33 more
Caused by: javax.naming.NameNotFoundException: Name ProcessEngine is not bound in this Context
at org.apache.naming.NamingContext.lookup(NamingContext.java:770)
at org.apache.naming.NamingContext.lookup(NamingContext.java:153)
at org.apache.naming.SelectorContext.lookup(SelectorContext.java:137)
at javax.naming.InitialContext.lookup(InitialContext.java:392)
at org.jbpm.integration.console.forms.TaskDispatcherPluginImpl.initializeProcessEngine(TaskDispatcherPluginImpl.java:243)
... 41 more
May 19, 2009 6:33:13 PM org.apache.catalina.core.StandardWrapperValve invoke
SEVERE: Servlet.service() for servlet Resteasy threw exception
org.jboss.resteasy.spi.UnhandledException: java.lang.RuntimeException: Failed to lookup process engine
at org.jboss.resteasy.core.SynchronousDispatcher.handleApplicationException(SynchronousDispatcher.java:319)
at org.jboss.resteasy.core.SynchronousDispatcher.handleException(SynchronousDispatcher.java:230)
at org.jboss.resteasy.core.SynchronousDispatcher.handleInvokerException(SynchronousDispatcher.java:206)
at org.jboss.resteasy.core.SynchronousDispatcher.invoke(SynchronousDispatcher.java:360)
at org.jboss.resteasy.core.SynchronousDispatcher.invoke(SynchronousDispatcher.java:173)
at org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher.service(HttpServletDispatcher.java:93)
at org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher.service(HttpServletDispatcher.java:68)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.jboss.bpm.console.server.util.GWTJsonFilter.doFilter(GWTJsonFilter.java:59)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:228)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:104)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:216)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:634)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:445)
at java.lang.Thread.run(Thread.java:619)
Caused by: java.lang.RuntimeException: Failed to lookup process engine
at org.jbpm.integration.console.JBPMIntegration.initializeProcessEngine(JBPMIntegration.java:50)
at org.jbpm.integration.console.JBPMIntegration.(JBPMIntegration.java:38)
at org.jbpm.integration.console.TaskManagementImpl.(TaskManagementImpl.java:42)
at org.jbpm.integration.console.ManagementFactoryImpl.createTaskManagement(ManagementFactoryImpl.java:43)
at org.jboss.bpm.console.server.TaskListFacade.getTaskManagement(TaskListFacade.java:61)
at org.jboss.bpm.console.server.TaskListFacade.getTasksForIdRef(TaskListFacade.java:90)
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.resteasy.core.MethodInjectorImpl.invoke(MethodInjectorImpl.java:117)
at org.jboss.resteasy.core.ResourceMethod.invokeOnTarget(ResourceMethod.java:260)
at org.jboss.resteasy.core.ResourceMethod.invoke(ResourceMethod.java:232)
at org.jboss.resteasy.core.ResourceMethod.invoke(ResourceMethod.java:166)
at org.jboss.resteasy.core.DispatcherUtilities.getJaxrsResponse(DispatcherUtilities.java:142)
at org.jboss.resteasy.core.SynchronousDispatcher.invoke(SynchronousDispatcher.java:356)
... 19 more
Caused by: javax.naming.NameNotFoundException: Name ProcessEngine is not bound in this Context
at org.apache.naming.NamingContext.lookup(NamingContext.java:770)
at org.apache.naming.NamingContext.lookup(NamingContext.java:153)
at org.apache.naming.SelectorContext.lookup(SelectorContext.java:137)
at javax.naming.InitialContext.lookup(InitialContext.java:392)
at org.jbpm.integration.console.JBPMIntegration.initializeProcessEngine(JBPMIntegration.java:46)
... 34 more
May 19, 2009 6:47:02 PM org.apache.catalina.core.StandardWrapperValve invoke
SEVERE: Servlet.service() for servlet Resteasy threw exception
org.jboss.resteasy.spi.UnhandledException: java.lang.RuntimeException: Failed to lookup process engine
at org.jboss.resteasy.core.SynchronousDispatcher.handleApplicationException(SynchronousDispatcher.java:319)
at org.jboss.resteasy.core.SynchronousDispatcher.handleException(SynchronousDispatcher.java:230)
at org.jboss.resteasy.core.SynchronousDispatcher.handleInvokerException(SynchronousDispatcher.java:206)
at org.jboss.resteasy.core.SynchronousDispatcher.invoke(SynchronousDispatcher.java:360)
at org.jboss.resteasy.core.SynchronousDispatcher.invoke(SynchronousDispatcher.java:173)
at org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher.service(HttpServletDispatcher.java:93)
at org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher.service(HttpServletDispatcher.java:68)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.jboss.bpm.console.server.util.GWTJsonFilter.doFilter(GWTJsonFilter.java:59)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:228)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:104)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:216)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:634)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:445)
at java.lang.Thread.run(Thread.java:619)
Caused by: java.lang.RuntimeException: Failed to lookup process engine
at org.jbpm.integration.console.JBPMIntegration.initializeProcessEngine(JBPMIntegration.java:50)
at org.jbpm.integration.console.JBPMIntegration.(JBPMIntegration.java:38)
at org.jbpm.integration.console.ProcessManagementImpl.(ProcessManagementImpl.java:44)
at org.jbpm.integration.console.ManagementFactoryImpl.createProcessManagement(ManagementFactoryImpl.java:37)
at org.jboss.bpm.console.server.ProcessMgmtFacade.getProcessManagement(ProcessMgmtFacade.java:64)
at org.jboss.bpm.console.server.ProcessMgmtFacade.getDefinitionsJSON(ProcessMgmtFacade.java:77)
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.resteasy.core.MethodInjectorImpl.invoke(MethodInjectorImpl.java:117)
at org.jboss.resteasy.core.ResourceMethod.invokeOnTarget(ResourceMethod.java:260)
at org.jboss.resteasy.core.ResourceMethod.invoke(ResourceMethod.java:232)
at org.jboss.resteasy.core.ResourceMethod.invoke(ResourceMethod.java:166)
at org.jboss.resteasy.core.DispatcherUtilities.getJaxrsResponse(DispatcherUtilities.java:142)
at org.jboss.resteasy.core.SynchronousDispatcher.invoke(SynchronousDispatcher.java:356)
... 19 more
Caused by: javax.naming.NameNotFoundException: Name ProcessEngine is not bound in this Context
at org.apache.naming.NamingContext.lookup(NamingContext.java:770)
at org.apache.naming.NamingContext.lookup(NamingContext.java:153)
at org.apache.naming.SelectorContext.lookup(SelectorContext.java:137)
at javax.naming.InitialContext.lookup(InitialContext.java:392)
at org.jbpm.integration.console.JBPMIntegration.initializeProcessEngine(JBPMIntegration.java:46)
... 34 more



Anyone's help is appreciated :)

Thanks,
Kasi.

[heiko.braun]

Right, that's not yet integrated out of the box. However it shouldn't be too difficult. You'd need to create a ProcessEngine instance and bind it to tomcats JNDI in order for any other console-server component to access it.

Take a look at [1] first, it explains how to bind Resource Factories to JNDI under tomcat. The spi module [2] already ships with Resource and Resource Factory implementations that can act as example. But you would need to replace the JBPMServiceLocator with something that works in tomcat. As a starting point see


org.jbpm.integration.spi.ProcessEngineReference
org.jbpm.integration.spi.ProcessEngineObjectFactory


The later is the ResourceFactory.

[1] http://tomcat.apache.org/tomcat-5.5-doc/jndi-resources-howto.html#Adding%20Custom%20Resource%20Factories
[2] http://anonsvn.jboss.org/repos/jbpm/jbpm4/trunk/modules/integration/spi/


Let me know if you have further questions.

[heiko.braun]

Here is the source of the ResourceFactory: http://fpaste.org/paste/12970. Line 48 would need to be replaced with a locator that works under tomcat.

I am not sure what would be the best approach to this. Maybe a ServletContextListener that creates a singleton?

[gkasinarayanan]

Hi,

Thanks for your reply.

I make the below changes to create JNDI for processengine

1. Added a separate class similar to ProcessEngineObjectFactory and modified the code the to get process engine from a static variable which i'm loaidng on start of server.

public class ProceeEngineFactory implements ObjectFactory
{
 public Object getObjectInstance(
 Object obj, Name name,
 Context nameCtx, Hashtable environment) throws Exception
 {
// super.getObjectInstance(obj, name, nameCtx, environment);
 if (obj instanceof Reference) {
 Reference ref = (Reference)obj;
 if (ref.getClassName().equals(ProcessEngine.class.getName())) {
 RefAddr engineName = ref.get(ProcessEngineReference.ENGINE_NAME); // currently not used
 return JBPMUtils.getJbpmProcesEngine();
 }
 }

 return null;
 }
}

2. Made the below changes to context.xml in tomcat server conf

<Resource name="ProcessEngine" auth="Container"
 type="org.jbpm.api.ProcessEngine"
 factory="ct.fw.pf.util.ProceeEngineFactory"/>

3. Made the below changes to web.xml of GWT-Console-Server app

<resource-env-ref>
 <description>
 Object factory for MyBean instances.
 </description>
 <resource-env-ref-name>
 ProcessEngine
 </resource-env-ref-name>
 <resource-env-ref-type>
 org.jbpm.api.ProcessEngine
 </resource-env-ref-type>
 </resource-env-ref>

But its not resolving the issue posted.

When i try adding the above web.xml entry in another web app running in the same server and access processengine using the code below

InitialContext initCtx = new InitialContext();
 Context envCtx = (Context) initCtx.lookup("java:comp/env");
 ProcessEngine bean = (ProcessEngine) envCtx.lookup("ProcessEngine");

I get the following error

javax.naming.NamingException: Cannot create resource instance
 at org.apache.naming.factory.ResourceEnvFactory.getObjectInstance(ResourceEnvFactory.java:114)
 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:153)
 at ct.fw.web.query.ajax.AjaxQueryBuilderPage.setup(AjaxQueryBuilderPage.java:71)
 at ct.fw.web.query.ajax.EntryPointAjaxQueryBuilderAction.setup(EntryPointAjaxQueryBuilderAction.java:48)
 at ct.fw.struts.extension.SmartAction.executeSetup(SmartAction.java:248)
 at ct.fw.struts.extension.SmartAction.execute(SmartAction.java:110)
 at ct.fw.struts.extension.RelaxServlet.doPost(RelaxServlet.java:112)
 at ct.fw.struts.extension.RelaxServlet.doGet(RelaxServlet.java:67)
 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:290)
 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
 at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:228)
 at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
 at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
 at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:104)
 at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
 at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:216)
 at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
 at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:634)
 at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:445)
 at java.lang.Thread.run(Thread.java:619)

Any hint on this?

Thanks,
Kasi