I have defined a process definition with the following decision node where Account is a POJO. I can see that the Account as a jBPM variable in the jBPM Admin Console.

<decision name="Sufficient Funds in Account?" expression="#

">
<transition to="Post Toll Transaction to Account" name="true"></transition>
<transition to="Replenish Account" name="false"></transition>
</decision>

When I execute the process, I get the following errors:

15:55:39,123 ERROR [GraphElement] action threw exception: decision 'Sufficient Funds in Account?' selected non existing transition 'true '
org.jbpm.JbpmException: decision 'Sufficient Funds in Account?' selected non existing transition 'true '
at org.jbpm.graph.node.Decision.execute(Decision.java:102)
at org.jbpm.graph.def.Node.enter(Node.java:319)
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:585)
at org.hibernate.proxy.pojo.cglib.CGLIBLazyInitializer.invoke(CGLIBLazyInitializer.java:157)
at org.jbpm.graph.def.Node$$EnhancerByCGLIB$$b7f2fc0f.enter(<generated>)
at org.jbpm.graph.def.Transition.take(Transition.java:151)
at org.jbpm.graph.def.Node.leave(Node.java:394)
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:585)
at org.hibernate.proxy.pojo.cglib.CGLIBLazyInitializer.invoke(CGLIBLazyInitializer.java:157)
at org.jbpm.graph.def.Node$$EnhancerByCGLIB$$b7f2fc0f.leave(<generated>)
at org.jbpm.graph.exe.Token.signal(Token.java:195)
at org.jbpm.graph.exe.Token.signal(Token.java:140)
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:585)
at org.hibernate.proxy.pojo.cglib.CGLIBLazyInitializer.invoke(CGLIBLazyInitializer.java:157)
at org.jbpm.graph.exe.Token$$EnhancerByCGLIB$$e74c698b.signal(<generated>)
at org.jbpm.command.SignalCommand.execute(SignalCommand.java:91)
at org.jboss.soa.esb.services.jbpm.cmd.AsyncProcessSignal$AsyncSignalAction.execute(AsyncProcessSignal.java:287)
at org.jbpm.graph.def.Action.execute(Action.java:122)
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:585)
at org.hibernate.proxy.pojo.cglib.CGLIBLazyInitializer.invoke(CGLIBLazyInitializer.java:157)
at org.jbpm.graph.def.Action$$EnhancerByCGLIB$$b15cf56b.execute(<generated>)
at org.jbpm.graph.def.GraphElement.executeAction(GraphElement.java:264)
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:585)
at org.hibernate.proxy.pojo.cglib.CGLIBLazyInitializer.invoke(CGLIBLazyInitializer.java:157)
at org.jbpm.graph.def.Node$$EnhancerByCGLIB$$b7f2fc0f.executeAction(<generated>)
at org.jbpm.job.ExecuteActionJob.execute(ExecuteActionJob.java:32)
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:585)
at org.hibernate.proxy.pojo.cglib.CGLIBLazyInitializer.invoke(CGLIBLazyInitializer.java:157)
at org.jbpm.job.Job$$EnhancerByCGLIB$$27ab04c8.execute(<generated>)
at org.jbpm.job.executor.JobExecutorThread.executeJob(JobExecutorThread.java:164)
at org.jbpm.job.executor.JobExecutorThread.run(JobExecutorThread.java:64)

I then tried the following (simpler) expression, and got a similar result:

#

16:07:28,807 ERROR [GraphElement] action threw exception: decision 'Sufficient Funds in Account?' selected non existing transition 'false '
org.jbpm.JbpmException: decision 'Sufficient Funds in Account?' selected non existing transition 'false '