Problem adding participants to a workflow

[frangarciaguez_]

Hello.

I am trying to start a workflow (serial or parallel), but when I am assigning the participants, I get an error, and the workflow doesn't start.

In the log I can see the following messages:

---

javax.servlet.ServletException: On requestURL ...
at org.nuxeo.ecm.platform.ui.web.rest.FancyURLFilter.doFilter(FancyURLFilter.java:152)
...
Caused by: javax.servlet.ServletException: [Error: null pointer: WorkflowVariables["participants"][(int)WorkflowVariables.index]]
[Near : {... WorkflowVariables["participant ....}]
             ^
[Line: 1, Column: 1]
	at javax.faces.webapp.FacesServlet.service(FacesServlet.java:659)
...
Caused by: javax.faces.el.EvaluationException: [Error: null pointer: WorkflowVariables["participants"][(int)WorkflowVariables.index]]
[Near : {... WorkflowVariables["participant ....}]
             ^
[Line: 1, Column: 1]
	at javax.faces.component.MethodBindingMethodExpressionAdapter.invoke(MethodBindingMethodExpressionAdapter.java:101)
...
Caused by: [Error: null pointer: WorkflowVariables["participants"][(int)WorkflowVariables.index]]
[Near : {... WorkflowVariables["participant ....}]
             ^
[Line: 1, Column: 1]
	at org.mvel2.optimizers.impl.refl.ReflectiveAccessorOptimizer.compileGetChain(ReflectiveAccessorOptimizer.java:427)
...
Caused by: java.lang.NullPointerException
	at org.mvel2.optimizers.impl.refl.ReflectiveAccessorOptimizer.getCollectionProperty(ReflectiveAccessorOptimizer.java:774)

---

What can be the problem?

Thanks in advance!

Best regards.

[Vladimir_Pasqui]

Hi!

[nathan1620_]

This issue should have been fixed with HF1. I'm running into the same problem still. Maybe try one of these variations:

WorkflowVariables["participants"][(int)WorkflowVariables.index]]

WorkflowVariables["participants"][WorkflowVariables["index"]]

WorkflowVariables["participants"][(int)WorkflowVariables["index"]]

None of them worked for me, but they might work for you. My issue is from the brackets around the index workflow variable expression, the expression itself works fine.

[Florent_Guillau]

Instead of brackets have you tried WorkflowVariables["participants"].get(WorkflowVariables["index"]) or variations thereof?

[nathan1620_]

I think for our purposes and how the workflow does its indexing/counting, the expression has to be of the form