org.jbpm.persistence.JbpmPersistenceException: couldn't assign id to org.jbpm.graph.exe.ProcessInstance@1db8d2b
	at org.jbpm.persistence.db.DbPersistenceService.assignId(DbPersistenceService.java:226)
	at org.jbpm.svc.Services.assignId(Services.java:235)
	at org.jbpm.graph.exe.ProcessInstance.<init>(ProcessInstance.java:95)
	at com.forgon.workflow.util.WorkflowUtil.initProcessInstance(WorkflowUtil.java:207)
	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.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:307)
	at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:182)
	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:149)
	at org.springframework.security.intercept.method.aopalliance.MethodSecurityInterceptor.invoke(MethodSecurityInterceptor.java:66)
	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
	at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:106)
	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
	at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:204)
	at $Proxy58.initProcessInstance(Unknown Source)
	at com.forgon.csair.training.traininginstance.controller.TrainingInstanceFormController.onBind(TrainingInstanceFormController.java:73)
	at org.springframework.web.servlet.mvc.BaseCommandController.bindAndValidate(BaseCommandController.java:392)
	at org.springframework.web.servlet.mvc.AbstractFormController.handleRequestInternal(AbstractFormController.java:263)
	at org.springframework.web.servlet.mvc.AbstractController.handleRequest(AbstractController.java:153)