Problems with HibNodeRef

[Simon]

Hi all

I'd like to add a new workflow defintion with the HibGraphFactory.
Adding the graph itselfs and also adding nodes works fine but if try
to add an arc I get an exception.

The call is as follows:
engine.getFactory().newArc(graph, startNode, endNode, name);

Which yields the following exception:

java.lang.RuntimeException:
com.google.gwt.user.server.rpc.UnexpectedException: Service method
'public abstract ch.wd.client.command.IReturn
ch.wd.client.command.RPCService.execute(ch.wd.client.command.IRemoteProcedure)'
threw an unexpected exception: java.lang.RuntimeException:
org.hibernate.PropertyAccessException: could not get a field value by
reflection getter of com.googlecode.sarasvati.hib.HibNodeRef.id
at
org.gwtwidgets.server.spring.GWTRPCServiceExporter.handleExporterProcessingException(GWTRPCServiceExporter.java:
384)
at
org.gwtwidgets.server.spring.GWTRPCServiceExporter.processCall(GWTRPCServiceExporter.java:
353)
at
com.google.gwt.user.server.rpc.RemoteServiceServlet.processPost(RemoteServiceServlet.java:
224)
at
com.google.gwt.user.server.rpc.AbstractRemoteServiceServlet.doPost(AbstractRemoteServiceServlet.java:
62)
at
org.gwtwidgets.server.spring.GWTRPCServiceExporter.handleRequest(GWTRPCServiceExporter.java:
407)
at
org.springframework.web.servlet.mvc.HttpRequestHandlerAdapter.handle(HttpRequestHandlerAdapter.java:
49)
at
org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:
771)
at
org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:
716)
at
org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:
644)
at
org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:
560)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:637)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:
487)
at org.mortbay.jetty.servlet.ServletHandler
$CachedChain.doFilter(ServletHandler.java:1097)
at org.springframework.security.web.FilterChainProxy
$VirtualFilterChain.doFilter(FilterChainProxy.java:343)
at
org.springframework.security.web.access.intercept.FilterSecurityInterceptor.invoke(FilterSecurityInterceptor.java:
109)
at
org.springframework.security.web.access.intercept.FilterSecurityInterceptor.doFilter(FilterSecurityInterceptor.java:
83)
at org.springframework.security.web.FilterChainProxy
$VirtualFilterChain.doFilter(FilterChainProxy.java:355)
at
ch.wd.server.security.GWTExceptionTranslationFilter.doFilter(GWTExceptionTranslationFilter.java:
93)
at org.springframework.security.web.FilterChainProxy
$VirtualFilterChain.doFilter(FilterChainProxy.java:355)
at
org.springframework.security.web.authentication.AbstractAuthenticationProcessingFilter.doFilter(AbstractAuthenticationProcessingFilter.java:
188)
at org.springframework.security.web.FilterChainProxy
$VirtualFilterChain.doFilter(FilterChainProxy.java:355)
at
org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter(SecurityContextPersistenceFilter.java:
79)
at org.springframework.security.web.FilterChainProxy
$VirtualFilterChain.doFilter(FilterChainProxy.java:355)
at
org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:
149)
at
org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:
237)
at
org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:
167)
at org.mortbay.jetty.servlet.ServletHandler
$CachedChain.doFilter(ServletHandler.java:1088)
at
org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:
360)
at
org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:
216)
at
org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:
181)
at
org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:
729)
at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:
405)
at
org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:
152)
at
org.mortbay.jetty.handler.RequestLogHandler.handle(RequestLogHandler.java:
49)
at
org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:
152)
at org.mortbay.jetty.Server.handle(Server.java:324)
at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:
505)
at org.mortbay.jetty.HttpConnection
$RequestHandler.content(HttpConnection.java:843)
at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:647)
at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:211)
at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:380)
at
org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:
395)
at org.mortbay.thread.QueuedThreadPool
$PoolThread.run(QueuedThreadPool.java:488)
Caused by: com.google.gwt.user.server.rpc.UnexpectedException: Service
method 'public abstract ch.wd.client.command.IReturn
ch.wd.client.command.RPCService.execute(ch.wd.client.command.IRemoteProcedure)'
threw an unexpected exception: java.lang.RuntimeException:
org.hibernate.PropertyAccessException: could not get a field value by
reflection getter of com.googlecode.sarasvati.hib.HibNodeRef.id
at
com.google.gwt.user.server.rpc.RPC.encodeResponseForFailure(RPC.java:
378)
at
com.google.gwt.user.server.rpc.RPC.encodeResponseForFailure(RPC.java:
361)
at
org.gwtwidgets.server.spring.GWTRPCServiceExporter.encodeResponseForFailure(GWTRPCServiceExporter.java:
223)
at
org.gwtwidgets.server.spring.gilead.GileadRPCServiceExporter.encodeResponseForFailure(GileadRPCServiceExporter.java:
169)
at
org.gwtwidgets.server.spring.GWTRPCServiceExporter.handleInvocationTargetException(GWTRPCServiceExporter.java:
256)
at
org.gwtwidgets.server.spring.GWTRPCServiceExporter.processCall(GWTRPCServiceExporter.java:
344)
... 42 more
Caused by: java.lang.RuntimeException:
org.hibernate.PropertyAccessException: could not get a field value by
reflection getter of com.googlecode.sarasvati.hib.HibNodeRef.id
at ch.wd.server.rpcservice.RPCServiceImpl.execute(RPCServiceImpl.java:
57)
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.gwtwidgets.server.spring.gilead.GileadRPCServiceExporter.invokeMethodOnService(GileadRPCServiceExporter.java:
149)
at
org.gwtwidgets.server.spring.GWTRPCServiceExporter.processCall(GWTRPCServiceExporter.java:
338)
... 42 more
Caused by: org.hibernate.PropertyAccessException: could not get a
field value by reflection getter of
com.googlecode.sarasvati.hib.HibNodeRef.id
at org.hibernate.property.DirectPropertyAccessor
$DirectGetter.get(DirectPropertyAccessor.java:62)
at
org.hibernate.tuple.entity.AbstractEntityTuplizer.getIdentifier(AbstractEntityTuplizer.java:
230)
at
org.hibernate.persister.entity.AbstractEntityPersister.getIdentifier(AbstractEntityPersister.java:
3852)
at
org.hibernate.persister.entity.AbstractEntityPersister.isTransient(AbstractEntityPersister.java:
3560)
at org.hibernate.engine.ForeignKeys.isTransient(ForeignKeys.java:204)
at org.hibernate.engine.ForeignKeys
$Nullifier.isNullifiable(ForeignKeys.java:160)
at org.hibernate.engine.ForeignKeys
$Nullifier.nullifyTransientReferences(ForeignKeys.java:92)
at org.hibernate.engine.ForeignKeys
$Nullifier.nullifyTransientReferences(ForeignKeys.java:70)
at
org.hibernate.event.def.AbstractSaveEventListener.performSaveOrReplicate(AbstractSaveEventListener.java:
311)
at
org.hibernate.event.def.AbstractSaveEventListener.performSave(AbstractSaveEventListener.java:
204)
at
org.hibernate.event.def.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:
130)
at
org.hibernate.ejb.event.EJB3SaveEventListener.saveWithGeneratedId(EJB3SaveEventListener.java:
62)
at
org.hibernate.event.def.DefaultSaveOrUpdateEventListener.saveWithGeneratedOrRequestedId(DefaultSaveOrUpdateEventListener.java:
210)
at
org.hibernate.event.def.DefaultSaveEventListener.saveWithGeneratedOrRequestedId(DefaultSaveEventListener.java:
56)
at
org.hibernate.event.def.DefaultSaveOrUpdateEventListener.entityIsTransient(DefaultSaveOrUpdateEventListener.java:
195)
at
org.hibernate.event.def.DefaultSaveEventListener.performSaveOrUpdate(DefaultSaveEventListener.java:
50)
at
org.hibernate.event.def.DefaultSaveOrUpdateEventListener.onSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:
93)
at org.hibernate.impl.SessionImpl.fireSave(SessionImpl.java:705)
at org.hibernate.impl.SessionImpl.save(SessionImpl.java:693)
at org.hibernate.impl.SessionImpl.save(SessionImpl.java:689)
at
com.googlecode.sarasvati.hib.HibGraphFactory.newArc(HibGraphFactory.java:
79)
at
ch.wd.server.procedure.wf.SaveGraphProcedure.go(SaveGraphProcedure.java:
109)
at
ch.wd.server.procedure.wf.SaveGraphProcedure.go(SaveGraphProcedure.java:
1)
at ch.wd.server.rpcservice.RPCServiceImpl.execute(RPCServiceImpl.java:
54)
... 48 more
Caused by: java.lang.IllegalArgumentException: Can not set
java.lang.Long field com.googlecode.sarasvati.hib.HibNodeRef.id to
com.googlecode.sarasvati.hib.HibNode
at
sun.reflect.UnsafeFieldAccessorImpl.throwSetIllegalArgumentException(UnsafeFieldAccessorImpl.java:
146)
at
sun.reflect.UnsafeFieldAccessorImpl.throwSetIllegalArgumentException(UnsafeFieldAccessorImpl.java:
150)
at
sun.reflect.UnsafeFieldAccessorImpl.ensureObj(UnsafeFieldAccessorImpl.java:
37)
at
sun.reflect.UnsafeObjectFieldAccessorImpl.get(UnsafeObjectFieldAccessorImpl.java:
18)
at java.lang.reflect.Field.get(Field.java:358)
at org.hibernate.property.DirectPropertyAccessor
$DirectGetter.get(DirectPropertyAccessor.java:59)
... 71 more


I'd very much appreciate a hint pointing me in the right direction!

Thanks & cheers
Simon

[Paul Lorenz]

Hi Simon,
I'm guessing a little here, since I'm just going off the stacktrace,
but I wonder if you're sending in instances of HibNode, instead of
HibNodeRef to newArc? Can you check this (maybe put a breakpoint in
newArc, and see what types you're getting). Otherwise, if you have a
reproducible test case, I can definitely track it down. Either way,
let me know what the results are, and if that's not the right fix, I
can ponder some more. If that is the right fix, I'll add a type check
to new arc, to make the error more visible.

Cheers,
Paul

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[Simon]

Hi Paul

You guessed absolutely right! I indeed sent HibNodes instead of
HibNodeRefs (I missunderstood the concept here).
After correcting this it's working perfectly now.

Thanks for the excellent help!

Cheers,
Simon

[Paul Lorenz]

Glad I could help. I'll add a fast fail check there, with a more informative message.
If you don't mind me asking, why are you using the graph factory directly, over the graph loader, which should have a friendlier and simpler API?

Cheers,
Paul

Simon

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