Cannot find serializer for value ObjectValue ... isTransient=true

This seems like a bug in 7.9.0. When resuming from a wait state, an attempt to add a transient variable fails.

Calling setVariable on an ExecutionEntity, I get the error:

Exception while closing command context: Cannot find serializer for value ‘ObjectValue [value=com.emc.brs.workflow.manager.WorkflowDataAccess@3409265b - dataSource=null, isDeserialized=true, serializationDataFormat=null, objectTypeName=null, serializedValue=null, isTransient=true]’.

I’ve tried passing the value as an ObjectValue and UntypedValue:

 Variables.objectValue( value, true ).create()

 Variables.untypedValue( value, true ) 

Both result in the same error. Here is a stack trace:

at org.camunda.bpm.engine.impl.variable.serializer.DefaultVariableSerializers.findSerializerForValue(DefaultVariableSerializers.java:84)
at org.camunda.bpm.engine.impl.persistence.entity.util.TypedValueField.setValue(TypedValueField.java:110)
at org.camunda.bpm.engine.impl.persistence.entity.VariableInstanceEntity.(VariableInstanceEntity.java:122)
at org.camunda.bpm.engine.impl.persistence.entity.VariableInstanceEntity.create(VariableInstanceEntity.java:141)
at org.camunda.bpm.engine.impl.persistence.entity.VariableInstanceEntityFactory.build(VariableInstanceEntityFactory.java:27)
at org.camunda.bpm.engine.impl.persistence.entity.VariableInstanceEntityFactory.build(VariableInstanceEntityFactory.java:21)
at org.camunda.bpm.engine.impl.core.variable.scope.AbstractVariableScope.setVariableLocalTransient(AbstractVariableScope.java:447)
at org.camunda.bpm.engine.impl.core.variable.scope.AbstractVariableScope.setVariableLocalTransient(AbstractVariableScope.java:453)
at org.camunda.bpm.engine.impl.core.variable.scope.AbstractVariableScope.setVariable(AbstractVariableScope.java:328)
at org.camunda.bpm.engine.impl.core.variable.scope.AbstractVariableScope.setVariable(AbstractVariableScope.java:306)

Am I doing something wrong or is this a bug?

I’m not able to reproduce the issue. I’m using 7.9.0 with springboot starter.

Setting transient in Delegate

  public void execute(DelegateExecution execution) throws Exception {
    
    TypedValue typedTransientObjectValue = Variables.objectValue(new Person("Pato", "pato@noreply.com"), true).create();	
    execution.setVariable("pato", typedTransientObjectValue);
}

Starting process with transient variable

	TypedValue typedTransientObjectValue = Variables.objectValue(new Person("Paul", "paul@noreply.com"), true).create();
	Map<String, Object> varibles = Variables.putValue("product", json.toString()).putValueTyped("person", typedTransientObjectValue); 	
    ProcessInstance processInstance = processEngine().getRuntimeService().startProcessInstanceByKey(PROCESS_DEFINITION_KEY, varibles);
3 Likes

Thanks for the reply. I’ll have to elaborate. I don’t have any problem starting a process with a transient object variable. This problem only surfaces when I attempt to add such a variable when preparing to signal a process that is in a wait state. I execute a Command (using ProcessEngineConfigurationImpl.getCommandExecutorTxRequired()) which calls RuntimeService.signalEventReceived with a variable Map argument that contains a transient object variable (of the same type defined successfully at the beginning of the process). I cleaned this up a bit and this should be a better stack trace:

org.camunda.bpm.engine.ProcessEngineException: Cannot find serializer for value 'Untyped value 'com.emc.brs.workflow.manager.WorkflowDataAccess@6c2b9318 - dataSource=null', isTransient = true'.
  at org.camunda.bpm.engine.impl.variable.serializer.DefaultVariableSerializers.findSerializerForValue(DefaultVariableSerializers.java:84)
  at org.camunda.bpm.engine.impl.persistence.entity.util.TypedValueField.setValue(TypedValueField.java:110)
  at org.camunda.bpm.engine.impl.persistence.entity.VariableInstanceEntity.<init>(VariableInstanceEntity.java:122)
  at org.camunda.bpm.engine.impl.persistence.entity.VariableInstanceEntity.create(VariableInstanceEntity.java:141)
  at org.camunda.bpm.engine.impl.persistence.entity.VariableInstanceEntityFactory.build(VariableInstanceEntityFactory.java:27)
  at org.camunda.bpm.engine.impl.persistence.entity.VariableInstanceEntityFactory.build(VariableInstanceEntityFactory.java:21)
  at org.camunda.bpm.engine.impl.core.variable.scope.AbstractVariableScope.setVariableLocalTransient(AbstractVariableScope.java:447)
  at org.camunda.bpm.engine.impl.core.variable.scope.AbstractVariableScope.setVariableLocalTransient(AbstractVariableScope.java:453)
  at org.camunda.bpm.engine.impl.core.variable.scope.AbstractVariableScope.setVariable(AbstractVariableScope.java:328)
  at org.camunda.bpm.engine.impl.core.variable.scope.AbstractVariableScope.setVariable(AbstractVariableScope.java:323)
  at org.camunda.bpm.engine.impl.core.variable.scope.AbstractVariableScope.setVariable(AbstractVariableScope.java:306)
  at org.camunda.bpm.engine.impl.core.variable.scope.AbstractVariableScope.setVariables(AbstractVariableScope.java:253)
  at org.camunda.bpm.engine.impl.event.EventHandlerImpl.handleIntermediateEvent(EventHandlerImpl.java:48)
  at org.camunda.bpm.engine.impl.event.SignalEventHandler.handleEvent(SignalEventHandler.java:61)
  at org.camunda.bpm.engine.impl.persistence.entity.EventSubscriptionEntity.processEventSync(EventSubscriptionEntity.java:106)
  at org.camunda.bpm.engine.impl.persistence.entity.EventSubscriptionEntity.eventReceived(EventSubscriptionEntity.java:87)
  at org.camunda.bpm.engine.impl.cmd.SignalEventReceivedCmd.notifyExecutions(SignalEventReceivedCmd.java:158)
  at org.camunda.bpm.engine.impl.cmd.SignalEventReceivedCmd.sendSignalToExecution(SignalEventReceivedCmd.java:126)
  at org.camunda.bpm.engine.impl.cmd.SignalEventReceivedCmd.execute(SignalEventReceivedCmd.java:64)
  at org.camunda.bpm.engine.impl.cmd.SignalEventReceivedCmd.execute(SignalEventReceivedCmd.java:44)
  at org.camunda.bpm.engine.impl.interceptor.CommandExecutorImpl.execute(CommandExecutorImpl.java:24)
  at org.camunda.bpm.engine.impl.interceptor.CommandContextInterceptor.execute(CommandContextInterceptor.java:104)
  at org.camunda.bpm.engine.spring.SpringTransactionInterceptor$1.doInTransaction(SpringTransactionInterceptor.java:42)
  at org.springframework.transaction.support.TransactionTemplate.execute(TransactionTemplate.java:133)
  at org.camunda.bpm.engine.spring.SpringTransactionInterceptor.execute(SpringTransactionInterceptor.java:40)
  at org.camunda.bpm.engine.impl.interceptor.ProcessApplicationContextInterceptor.execute(ProcessApplicationContextInterceptor.java:66)
  at org.camunda.bpm.engine.impl.interceptor.LogInterceptor.execute(LogInterceptor.java:30)
  at org.camunda.bpm.engine.impl.SignalEventReceivedBuilderImpl.send(SignalEventReceivedBuilderImpl.java:91)
  at org.camunda.bpm.engine.impl.RuntimeServiceImpl.signalEventReceived(RuntimeServiceImpl.java:579)
  at com.emc.brs.workflow.manager.AsyncTaskMonitor$SignalCommand.execute(AsyncTaskMonitor.java:245)
  at com.emc.brs.workflow.manager.AsyncTaskMonitor$SignalCommand.execute(AsyncTaskMonitor.java:1)
  at org.camunda.bpm.engine.impl.interceptor.CommandExecutorImpl.execute(CommandExecutorImpl.java:24)
  at org.camunda.bpm.engine.impl.interceptor.CommandContextInterceptor.execute(CommandContextInterceptor.java:104)
  at org.camunda.bpm.engine.spring.SpringTransactionInterceptor$1.doInTransaction(SpringTransactionInterceptor.java:42)
  at org.springframework.transaction.support.TransactionTemplate.execute(TransactionTemplate.java:133)
  at org.camunda.bpm.engine.spring.SpringTransactionInterceptor.execute(SpringTransactionInterceptor.java:40)
  at org.camunda.bpm.engine.impl.interceptor.ProcessApplicationContextInterceptor.execute(ProcessApplicationContextInterceptor.java:66)
  at org.camunda.bpm.engine.impl.interceptor.LogInterceptor.execute(LogInterceptor.java:30)
  at com.emc.brs.workflow.manager.AsyncTaskMonitor.executeCommand(AsyncTaskMonitor.java:105)

I am in the process of converting from Activiti, so it could be that I’m not properly using RuntimeService.signalEventReceived?

You should avoid using the Impl packages in general. There is no guarantee these won’t change. I would need to see the BPMN and the code to help more. I think your approach may not be ideal.

1 Like

Hi there,

I am facing the same issue when trying to set a variable that doesn’t implement Serializable within a JavaDelegate of a service task. I set the variable as transient and am facing the same exception as above.

I also tried to start a process using the the code snippet in your example and I get the exact same exception.

The question is why is the engine trying to serialize a value that’s explicitly set as transient.

@Niall @Ingo_Richtsmeier sorry for the out of context mention. I am currently stuck here and not sure if this thread is alive so just wanted some help.

Thanks in advance.