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

Camunda 7 Topics Discussion & Questions
1

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?

2

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
3

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?

4

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
5

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.

1 Like
6

@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.

7