When validating the BPMN process (attached), the following NPE is generated.

15:23:49,349 ERROR [stderr] (pool-14-thread-1) java.lang.NullPointerException
15:23:49,350 ERROR [stderr] (pool-14-thread-1) at org.jbpm.ruleflow.core.validation.RuleFlowProcessValidator.validateNodes(RuleFlowProcessValidator.java:197)
15:23:49,350 ERROR [stderr] (pool-14-thread-1) at org.jbpm.ruleflow.core.validation.RuleFlowProcessValidator.validateProcess(RuleFlowProcessValidator.java:125)
15:23:49,350 ERROR [stderr] (pool-14-thread-1) at org.jbpm.ruleflow.core.validation.RuleFlowProcessValidator.validateProcess(RuleFlowProcessValidator.java:592)
15:23:49,350 ERROR [stderr] (pool-14-thread-1) at org.jbpm.compiler.ProcessBuilderImpl.buildProcess(ProcessBuilderImpl.java:117)
15:23:49,351 ERROR [stderr] (pool-14-thread-1) at org.jbpm.compiler.ProcessBuilderImpl.addProcessFromXml(ProcessBuilderImpl.java:260)
15:23:49,351 ERROR [stderr] (pool-14-thread-1) at org.drools.compiler.compiler.PackageBuilder.addProcessFromXml(PackageBuilder.java:693)
15:23:49,351 ERROR [stderr] (pool-14-thread-1) at org.drools.compiler.compiler.CompositeKnowledgeBuilderImpl.buildResources(CompositeKnowledgeBuilderImpl.java:131)
15:23:49,351 ERROR [stderr] (pool-14-thread-1) at org.drools.compiler.compiler.CompositeKnowledgeBuilderImpl.build(CompositeKnowledgeBuilderImpl.java:74)
15:23:49,352 ERROR [stderr] (pool-14-thread-1) at org.drools.compiler.kie.builder.impl.KieBuilderSetImpl.buildChanges(KieBuilderSetImpl.java:117)
15:23:49,352 ERROR [stderr] (pool-14-thread-1) at org.drools.compiler.kie.builder.impl.KieBuilderSetImpl.build(KieBuilderSetImpl.java:71)
15:23:49,352 ERROR [stderr] (pool-14-thread-1) at org.guvnor.common.services.builder.Builder.addResource(Builder.java:169)
15:23:49,352 ERROR [stderr] (pool-14-thread-1) at org.guvnor.common.services.builder.Builder.updateResource(Builder.java:216)
15:23:49,353 ERROR [stderr] (pool-14-thread-1) at org.guvnor.common.services.builder.BuildServiceImpl.updatePackageResource(BuildServiceImpl.java:174)
15:23:49,353 ERROR [stderr] (pool-14-thread-1) at org.guvnor.common.services.builder.BuildServiceImpl$Proxy$$$_WeldClientProxy.updatePackageResource(BuildServiceImpl$Proxy$$$_WeldClientProxy.java)
15:23:49,353 ERROR [stderr] (pool-14-thread-1) at org.guvnor.common.services.builder.BuildChangeListener$4.run(BuildChangeListener.java:224)
15:23:49,353 ERROR [stderr] (pool-14-thread-1) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
15:23:49,354 ERROR [stderr] (pool-14-thread-1) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
15:23:49,354 ERROR [stderr] (pool-14-thread-1) at java.lang.Thread.run(Thread.java:722)