topic Re: NPE on variables get from ProcessInstance loaded via ProcessInstanceQuery in Alfresco Archive

NPE on variables get from ProcessInstance loaded via ProcessInstanceQuery

mmaker1234 — Fri, 21 Jun 2013 10:49:16 GMT

Hello Activiti developers,While executing in Activiti 5.13<java start="488" fancy="6"> ProcessInstance process = runtimeService.createProcessInstanceQuery() .processInstanceId( "1234" ) .includeProcessVariables()

Re: NPE on variables get from ProcessInstance loaded via ProcessInstanceQuery

mmaker1234 — Mon, 01 Jul 2013 05:15:16 GMT

Hello,

Isn't there anyone to comment on the above?

Re: NPE on variables get from ProcessInstance loaded via ProcessInstanceQuery

frederikherema1 — Mon, 01 Jul 2013 08:59:43 GMT

Thanks for reporting. Issue has just been fixed on master:

https://jira.codehaus.org/browse/ACT-1731 and https://github.com/Activiti/Activiti/commit/136859b6e4100d80c34bfc5c43964c8c8e4362de.

Re: NPE on variables get from ProcessInstance loaded via ProcessInstanceQuery

mmaker1234 — Mon, 01 Jul 2013 10:21:56 GMT

Thank you, Frederik! 🙂

I'm glad I helped somehow.

Re: NPE on variables get from ProcessInstance loaded via ProcessInstanceQuery

trond_nordli — Wed, 10 Jul 2013 09:01:00 GMT

I have more or less the same bug in version 5.13 of the REST API, where you do not get the variables on the list of processes.

Works on list of task as expected:
/runtime/tasks?includeProcessVariables = true

Does not work on list of process:
/runtime/process-instances?includeProcessVariables = true

Where you only get blank values "variables": []

Will this error be corrected with the other issue or should this issue be reported separately ?

Re: NPE on variables get from ProcessInstance loaded via ProcessInstanceQuery

frederikherema1 — Wed, 10 Jul 2013 12:32:44 GMT

Should be reported separately, as it's not an exception that is occurring but rather something not working as expected…

Re: NPE on variables get from ProcessInstance loaded via ProcessInstanceQuery

st1 — Mon, 02 Dec 2013 15:05:20 GMT

First of all sorry for my english .
We use version 5.13 and to get list of HistoricVariableInstance we wanted to use NativeHistoricVariableInstanceQuery.

<code>
public List<HistoricVariableInstance> listHistoricVariableInstances(String processInstanceId, Collection<String> variableNames) {
..
StringBuilder query = new StringBuilder();
query.append("select * from ");
query.append(managementService.getTableName(HistoricVariableInstance.class));
query.append(" where proc_inst_id_ = #{proc_inst_id} and name_ in (");
query.append(ActivitiUtils.createInSet(variableNames));
query.append(")");
return historyService.createNativeHistoricVariableInstanceQuery().sql(query.toString()).parameter("proc_inst_id", processInstanceId).list();
}
</code>

But when we invoke "HistoricVariableInstance#getValue()",

<code>
private void mapVarList(List<HistoricVariableInstance> historicVariableInstances, Map<String, UserLoopResponses> varMap) {
if (historicVariableInstances == null || historicVariableInstances.isEmpty()) {
   return;
}
for (HistoricVariableInstance hiVariable : historicVariableInstances) {
   Object value = hiVariable.getValue();//This line throws npe

   if (value == null || !(value instanceof UserLoopResponses)) {
    continue;
   }
   varMap.put(hiVariable.getVariableName(), (UserLoopResponses) value);
}
}
</code>

we get :

<code>
java.lang.NullPointerException
at org.activiti.engine.impl.persistence.entity.ByteArrayRef.ensureInitialized(ByteArrayRef.java:94)
at org.activiti.engine.impl.persistence.entity.ByteArrayRef.getBytes(ByteArrayRef.java:45)
at org.activiti.engine.impl.persistence.entity.HistoricVariableInstanceEntity.getBytes(HistoricVariableInstanceEntity.java:119)
at org.activiti.engine.impl.variable.ByteArrayType.getValue(ByteArrayType.java:32)
at org.activiti.engine.impl.variable.SerializableType.getValue(SerializableType.java:51)
</code>
Historic value is serializable type. Now my question, is this is the same bug (i tried on version 5.14 but still that same) or i can't get serializable value by nativequery
(i'm beginer at activiti so i may have probably doing something silly )?

Re: NPE on variables get from ProcessInstance loaded via ProcessInstanceQuery

trademak — Wed, 04 Dec 2013 15:15:25 GMT

The query that you are performing can also be done via the standard Activiti API.
It was a bug in 5.13, but it should be working in 5.14. Could you create a JIRA issue with a unit test showing the issue?

Best regards,

Re: NPE on variables get from ProcessInstance loaded via ProcessInstanceQuery

erikwinlof — Wed, 04 Nov 2015 06:58:09 GMT

In case someone wants to follow the github link above (it shouldn't have the trailing ".") click this link instead:
https://github.com/Activiti/Activiti/commit/136859b6e4100d80c34bfc5c43964c8c8e4362de