Hi, 
i completed the practice 1 application. While working with practice 2 am
getting the below exception

Screen Render Error

java.lang.RuntimeException: Error rendering included form named
[ListPersons] at location [component://practice/widget/PracticeForms.xml]:
java.lang.NullPointerException
        at
org.ofbiz.widget.screen.ModelScreenWidget$Form.getModelForm(ModelScreenWidget.java:886)
        at
org.ofbiz.widget.screen.ModelScreenWidget$Form.renderWidgetString(ModelScreenWidget.java:862)
        at
org.ofbiz.widget.screen.ModelScreenWidget.renderSubWidgetsString(ModelScreenWidget.java:143)
        at
org.ofbiz.widget.screen.ModelScreenWidget$DecoratorSection.renderWidgetString(ModelScreenWidget.java:734)
        at
org.ofbiz.widget.screen.ModelScreenWidget$SectionsRenderer.render(ModelScreenWidget.java:172)
        at
org.ofbiz.widget.screen.ModelScreenWidget$DecoratorSectionInclude.renderWidgetString(ModelScreenWidget.java:764)
        at
org.ofbiz.widget.screen.ModelScreenWidget.renderSubWidgetsString(ModelScreenWidget.java:143)
        at
org.ofbiz.widget.screen.ModelScreenWidget$Section.renderWidgetString(ModelScreenWidget.java:232)
        at
org.ofbiz.widget.screen.ModelScreen.renderScreenString(ModelScreen.java:397)
        at
org.ofbiz.widget.screen.ModelScreenWidget$DecoratorScreen.renderWidgetString(ModelScreenWidget.java:704)
        at
org.ofbiz.widget.screen.ModelScreenWidget.renderSubWidgetsString(ModelScreenWidget.java:143)
        at
org.ofbiz.widget.screen.ModelScreenWidget$Section.renderWidgetString(ModelScreenWidget.java:232)
        at
org.ofbiz.widget.screen.ModelScreen.renderScreenString(ModelScreen.java:397)
        at 
org.ofbiz.widget.screen.ScreenRenderer.render(ScreenRenderer.java:132)
        at org.ofbiz.widget.screen.ScreenRenderer.render(ScreenRenderer.java:91)
        at
org.ofbiz.widget.screen.ScreenWidgetViewHandler.render(ScreenWidgetViewHandler.java:100)
        at
org.ofbiz.webapp.control.RequestHandler.renderView(RequestHandler.java:796)
        at
org.ofbiz.webapp.control.RequestHandler.doRequest(RequestHandler.java:537)
        at 
org.ofbiz.webapp.control.ControlServlet.doGet(ControlServlet.java:203)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:690)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
        at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
        at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
        at 
org.ofbiz.webapp.control.ContextFilter.doFilter(ContextFilter.java:260)
        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:233)
        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:102)
        at
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
        at
org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:568)
        at
org.ofbiz.catalina.container.CrossSubdomainSessionValve.invoke(CrossSubdomainSessionValve.java:63)
        at
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:286)
        at
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
        at
org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
        at 
org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
        at java.lang.Thread.run(Thread.java:619)

please guide me any better way to identify what went wrong.

the error log below

2010-12-14 16:39:55,546 (http-0.0.0.0-8080-1) [ 
ModelScreenWidget.java:885:ERROR] 

---- runtime exception report
--------------------------------------------------
Error rendering included form named [ListPersons] at location
[component://practice/widget/PracticeForms.xml]: 
Exception: java.lang.NullPointerException
Message: null
---- stack trace
---------------------------------------------------------------
java.lang.NullPointerException
org.ofbiz.widget.ModelWidget.<init>(ModelWidget.java:65)
org.ofbiz.widget.form.ModelForm.<init>(ModelForm.java:208)
org.ofbiz.widget.form.FormFactory.createModelForm(FormFactory.java:155)
org.ofbiz.widget.form.FormFactory.createModelForm(FormFactory.java:151)
org.ofbiz.widget.form.FormFactory.getFormFromLocation(FormFactory.java:86)
org.ofbiz.widget.screen.ModelScreenWidget$Form.getModelForm(ModelScreenWidget.java:882)
org.ofbiz.widget.screen.ModelScreenWidget$Form.renderWidgetString(ModelScreenWidget.java:862)
org.ofbiz.widget.screen.ModelScreenWidget.renderSubWidgetsString(ModelScreenWidget.java:143)
org.ofbiz.widget.screen.ModelScreenWidget$DecoratorSection.renderWidgetString(ModelScreenWidget.java:734)
org.ofbiz.widget.screen.ModelScreenWidget$SectionsRenderer.render(ModelScreenWidget.java:172)
org.ofbiz.widget.screen.ModelScreenWidget$DecoratorSectionInclude.renderWidgetString(ModelScreenWidget.java:764)
org.ofbiz.widget.screen.ModelScreenWidget.renderSubWidgetsString(ModelScreenWidget.java:143)
org.ofbiz.widget.screen.ModelScreenWidget$Section.renderWidgetString(ModelScreenWidget.java:232)
org.ofbiz.widget.screen.ModelScreen.renderScreenString(ModelScreen.java:397)
org.ofbiz.widget.screen.ModelScreenWidget$DecoratorScreen.renderWidgetString(ModelScreenWidget.java:704)
org.ofbiz.widget.screen.ModelScreenWidget.renderSubWidgetsString(ModelScreenWidget.java:143)
org.ofbiz.widget.screen.ModelScreenWidget$Section.renderWidgetString(ModelScreenWidget.java:232)
org.ofbiz.widget.screen.ModelScreen.renderScreenString(ModelScreen.java:397)
org.ofbiz.widget.screen.ScreenRenderer.render(ScreenRenderer.java:132)
org.ofbiz.widget.screen.ScreenRenderer.render(ScreenRenderer.java:91)
org.ofbiz.widget.screen.ScreenWidgetViewHandler.render(ScreenWidgetViewHandler.java:100)
org.ofbiz.webapp.control.RequestHandler.renderView(RequestHandler.java:796)
org.ofbiz.webapp.control.RequestHandler.doRequest(RequestHandler.java:537)
org.ofbiz.webapp.control.ControlServlet.doGet(ControlServlet.java:203)
javax.servlet.http.HttpServlet.service(HttpServlet.java:690)
javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
org.ofbiz.webapp.control.ContextFilter.doFilter(ContextFilter.java:260)
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:568)
org.ofbiz.catalina.container.CrossSubdomainSessionValve.invoke(CrossSubdomainSessionValve.java:63)
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:286)
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
java.lang.Thread.run(Thread.java:619)
--------------------------------------------------------------------------------


2010-12-14 16:39:55,546 (http-0.0.0.0-8080-1) [       
ModelScreen.java:402:ERROR] 

---- runtime exception report
--------------------------------------------------
Error rendering screen
[component://practice/widget/CommonScreens.xml#CommonPracticeDecorator]:
java.lang.RuntimeException: Error rendering included form named
[ListPersons] at location [component://practice/widget/PracticeForms.xml]:
java.lang.NullPointerException. Rolling back transaction.
Exception: java.lang.RuntimeException
Message: Error rendering included form named [ListPersons] at location
[component://practice/widget/PracticeForms.xml]:
java.lang.NullPointerException
---- stack trace
---------------------------------------------------------------
java.lang.RuntimeException: Error rendering included form named
[ListPersons] at location [component://practice/widget/PracticeForms.xml]:
java.lang.NullPointerException
org.ofbiz.widget.screen.ModelScreenWidget$Form.getModelForm(ModelScreenWidget.java:886)
org.ofbiz.widget.screen.ModelScreenWidget$Form.renderWidgetString(ModelScreenWidget.java:862)
org.ofbiz.widget.screen.ModelScreenWidget.renderSubWidgetsString(ModelScreenWidget.java:143)
org.ofbiz.widget.screen.ModelScreenWidget$DecoratorSection.renderWidgetString(ModelScreenWidget.java:734)
org.ofbiz.widget.screen.ModelScreenWidget$SectionsRenderer.render(ModelScreenWidget.java:172)
org.ofbiz.widget.screen.ModelScreenWidget$DecoratorSectionInclude.renderWidgetString(ModelScreenWidget.java:764)
org.ofbiz.widget.screen.ModelScreenWidget.renderSubWidgetsString(ModelScreenWidget.java:143)
org.ofbiz.widget.screen.ModelScreenWidget$Section.renderWidgetString(ModelScreenWidget.java:232)
org.ofbiz.widget.screen.ModelScreen.renderScreenString(ModelScreen.java:397)
org.ofbiz.widget.screen.ModelScreenWidget$DecoratorScreen.renderWidgetString(ModelScreenWidget.java:704)
org.ofbiz.widget.screen.ModelScreenWidget.renderSubWidgetsString(ModelScreenWidget.java:143)
org.ofbiz.widget.screen.ModelScreenWidget$Section.renderWidgetString(ModelScreenWidget.java:232)
org.ofbiz.widget.screen.ModelScreen.renderScreenString(ModelScreen.java:397)
org.ofbiz.widget.screen.ScreenRenderer.render(ScreenRenderer.java:132)
org.ofbiz.widget.screen.ScreenRenderer.render(ScreenRenderer.java:91)
org.ofbiz.widget.screen.ScreenWidgetViewHandler.render(ScreenWidgetViewHandler.java:100)
org.ofbiz.webapp.control.RequestHandler.renderView(RequestHandler.java:796)
org.ofbiz.webapp.control.RequestHandler.doRequest(RequestHandler.java:537)
org.ofbiz.webapp.control.ControlServlet.doGet(ControlServlet.java:203)
javax.servlet.http.HttpServlet.service(HttpServlet.java:690)
javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
org.ofbiz.webapp.control.ContextFilter.doFilter(ContextFilter.java:260)
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:568)
org.ofbiz.catalina.container.CrossSubdomainSessionValve.invoke(CrossSubdomainSessionValve.java:63)
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:286)
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
java.lang.Thread.run(Thread.java:619)
--------------------------------------------------------------------------------


2010-12-14 16:39:55,546 (http-0.0.0.0-8080-1) [   
TransactionUtil.java:231:ERROR] 

---- exception report
----------------------------------------------------------
Rollback Only was set when trying to commit transaction here; throwing
rollbackOnly cause exception
Exception: javax.transaction.RollbackException
Message: Unable to commit: transaction marked for rollback
---- stack trace
---------------------------------------------------------------
javax.transaction.RollbackException: Unable to commit: transaction marked
for rollback
org.apache.geronimo.transaction.manager.TransactionImpl.commit(TransactionImpl.java:271)
org.apache.geronimo.transaction.manager.TransactionManagerImpl.commit(TransactionManagerImpl.java:245)
org.ofbiz.entity.transaction.TransactionUtil.commit(TransactionUtil.java:210)
org.ofbiz.entity.transaction.TransactionUtil.commit(TransactionUtil.java:196)
org.ofbiz.widget.screen.ModelScreen.renderScreenString(ModelScreen.java:426)
org.ofbiz.widget.screen.ScreenRenderer.render(ScreenRenderer.java:132)
org.ofbiz.widget.screen.ScreenRenderer.render(ScreenRenderer.java:91)
org.ofbiz.widget.screen.ScreenWidgetViewHandler.render(ScreenWidgetViewHandler.java:100)
org.ofbiz.webapp.control.RequestHandler.renderView(RequestHandler.java:796)
org.ofbiz.webapp.control.RequestHandler.doRequest(RequestHandler.java:537)
org.ofbiz.webapp.control.ControlServlet.doGet(ControlServlet.java:203)
javax.servlet.http.HttpServlet.service(HttpServlet.java:690)
javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
org.ofbiz.webapp.control.ContextFilter.doFilter(ContextFilter.java:260)
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:568)
org.ofbiz.catalina.container.CrossSubdomainSessionValve.invoke(CrossSubdomainSessionValve.java:63)
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:286)
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
java.lang.Thread.run(Thread.java:619)
--------------------------------------------------------------------------------


2010-12-14 16:39:55,546 (http-0.0.0.0-8080-1) [       
ModelScreen.java:428:ERROR] 

---- exception report
----------------------------------------------------------
Could not commit transaction:
org.ofbiz.entity.transaction.GenericTransactionException: Roll back error,
could not commit transaction, was rolled back instead because of: Error
rendering screen
[component://practice/widget/CommonScreens.xml#CommonPracticeDecorator]:
java.lang.RuntimeException: Error rendering included form named
[ListPersons] at location [component://practice/widget/PracticeForms.xml]:
java.lang.NullPointerExceptionjava.lang.RuntimeException: Error rendering
included form named [ListPersons] at location
[component://practice/widget/PracticeForms.xml]:
java.lang.NullPointerException (Error rendering included form named
[ListPersons] at location [component://practice/widget/PracticeForms.xml]:
java.lang.NullPointerException)
Exception: org.ofbiz.entity.transaction.GenericTransactionException
Message: Roll back error, could not commit transaction, was rolled back
instead because of: Error rendering screen
[component://practice/widget/CommonScreens.xml#CommonPracticeDecorator]:
java.lang.RuntimeException: Error rendering included form named
[ListPersons] at location [component://practice/widget/PracticeForms.xml]:
java.lang.NullPointerExceptionjava.lang.RuntimeException: Error rendering
included form named [ListPersons] at location
[component://practice/widget/PracticeForms.xml]:
java.lang.NullPointerException (Error rendering included form named
[ListPersons] at location [component://practice/widget/PracticeForms.xml]:
java.lang.NullPointerException)
---- cause
---------------------------------------------------------------------
Exception: java.lang.RuntimeException
Message: Error rendering included form named [ListPersons] at location
[component://practice/widget/PracticeForms.xml]:
java.lang.NullPointerException
---- stack trace
---------------------------------------------------------------
java.lang.RuntimeException: Error rendering included form named
[ListPersons] at location [component://practice/widget/PracticeForms.xml]:
java.lang.NullPointerException
org.ofbiz.widget.screen.ModelScreenWidget$Form.getModelForm(ModelScreenWidget.java:886)
org.ofbiz.widget.screen.ModelScreenWidget$Form.renderWidgetString(ModelScreenWidget.java:862)
org.ofbiz.widget.screen.ModelScreenWidget.renderSubWidgetsString(ModelScreenWidget.java:143)
org.ofbiz.widget.screen.ModelScreenWidget$DecoratorSection.renderWidgetString(ModelScreenWidget.java:734)
org.ofbiz.widget.screen.ModelScreenWidget$SectionsRenderer.render(ModelScreenWidget.java:172)
org.ofbiz.widget.screen.ModelScreenWidget$DecoratorSectionInclude.renderWidgetString(ModelScreenWidget.java:764)
org.ofbiz.widget.screen.ModelScreenWidget.renderSubWidgetsString(ModelScreenWidget.java:143)
org.ofbiz.widget.screen.ModelScreenWidget$Section.renderWidgetString(ModelScreenWidget.java:232)
org.ofbiz.widget.screen.ModelScreen.renderScreenString(ModelScreen.java:397)
org.ofbiz.widget.screen.ModelScreenWidget$DecoratorScreen.renderWidgetString(ModelScreenWidget.java:704)
org.ofbiz.widget.screen.ModelScreenWidget.renderSubWidgetsString(ModelScreenWidget.java:143)
org.ofbiz.widget.screen.ModelScreenWidget$Section.renderWidgetString(ModelScreenWidget.java:232)
org.ofbiz.widget.screen.ModelScreen.renderScreenString(ModelScreen.java:397)
org.ofbiz.widget.screen.ScreenRenderer.render(ScreenRenderer.java:132)
org.ofbiz.widget.screen.ScreenRenderer.render(ScreenRenderer.java:91)
org.ofbiz.widget.screen.ScreenWidgetViewHandler.render(ScreenWidgetViewHandler.java:100)
org.ofbiz.webapp.control.RequestHandler.renderView(RequestHandler.java:796)
org.ofbiz.webapp.control.RequestHandler.doRequest(RequestHandler.java:537)
org.ofbiz.webapp.control.ControlServlet.doGet(ControlServlet.java:203)
javax.servlet.http.HttpServlet.service(HttpServlet.java:690)
javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
org.ofbiz.webapp.control.ContextFilter.doFilter(ContextFilter.java:260)
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:568)
org.ofbiz.catalina.container.CrossSubdomainSessionValve.invoke(CrossSubdomainSessionValve.java:63)
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:286)
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
java.lang.Thread.run(Thread.java:619)
--------------------------------------------------------------------------------

Thanks & Regards
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