jbpm+decision Node

[medjbpm]

hi

Can any one tell me or give me an exemple witch inclule a decision Node
(i work with jbpm3.1
gpd3.0.8)

thanks

[saviola]

Hi, medjbpm!
Here is an example:

<decision name="Payment Decision" expression="#{contextInstance.variables['Payment Decision']}">
 <transition name="To Cash Paid" to="Cash Paid"/>
 <transition name="To Bank Paid" to="Bank Paid"/>
 <transition to="Cash Paid"/>
 </decision>

Or you can use this one:

<decision name="Payment Decision" >
 <transition name="To Cash Paid" to="Cash Paid"/>
 <transition name="To Bank Paid" to="Bank Paid"/>
 <transition to="Cash Paid">
 <condition expression="#contextInstance.variables['Payment Decision'] ge 5"/>
 </transition>
 </decision>

Or this one:

 <decision name="Payment Decision" >
 <handler class="bla.bli.MyDecisionHandler"/>
 <transition name="To Cash Paid" to="Cash Paid"/>
 <transition name="To Bank Paid" to="Bank Paid"/>
 <transition to="Cash Paid"/>
 </decision>

[medjbpm]

thank you for replay
in this example :





<condition expression="#contextInstance.variables['Payment Decision'] ge 5"/>



what did you mean with
"['Payment Decision'] ge 5"
if you mean Payment Decision=5
how can i use other operation (<,>)

[senhce]

If you wanna add more manipulation and quering database use the handler. All you have to do is write a handler class which implements DecisionHandler of JBPM and configure the same in xml as shown below.
DecisionHandler will have a method decide the return type will determine which way to go. Hope this helps.








Thanks,
Senthil

[hornsbyr]

Hi,
I want to use a decision which takes a particular transition based on a process variable, and takes a default transition if the variable has not been set. The decision I am using is



<condition expression="#contextInstance.variables['tran'] eq null"/>


<condition expression="#contextInstance.variables['tran'] eq 'optionalState1'"/>


<condition expression="#contextInstance.variables['tran'] eq 'optionalState2'"/>



However I get an exception

org.jbpm.graph.def.DelegationException
...
Caused by: java.lang.NullPointerException
at org.jbpm.graph.node.Decision.execute(Decision.java:70)

Even though I set
contextInstance.setVariable("tran", "optionalState1");

Any ideas what could be causing this?
Also how can I check if an instance variable has not been set?
Is "#contextInstance.variables['tran'] eq null" the correct way?
Thanks

[hornsbyr]

Note: repost for readability, sorry, please ignore previous
Hi,
I want to use a decision which takes a particular transition based on a process variable, and takes a default transition if the variable has not been set. The decision I am using is

<decision name="intelligentState">
 <transition to="workFlowStart">
 <condition expression="#contextInstance.variables['tran'] eq null"/>
 </transition>
 <transition to="optionalState1">
 <condition expression="#contextInstance.variables['tran'] eq 'optionalState1'"/>
 </transition>
 <transition to="optionalState2">
 <condition expression="#contextInstance.variables['tran'] eq 'optionalState2'"/>
 </transition>
 </decision>

However I get an exception

org.jbpm.graph.def.DelegationException
...
Caused by: java.lang.NullPointerException
at org.jbpm.graph.node.Decision.execute(Decision.java:70)

Even though I set
contextInstance.setVariable("tran", "optionalState1");

Any ideas what could be causing this?
Also how can I check if an instance variable has not been set?
Is "#contextInstance.variables['tran'] eq null" the correct way?
Thanks

[saviola]

Hi, hornsbyr!
Maybe the problem is that the variable you are using is not mapped.
You can map it like this.

<node name="The node before the decision node">
.
.
.
<variable name="Var" mapped-name="Mapped Name" />
.
.
.

</node>

Remember that AFAIK you must use the mapped name in the transition condition.
I hope this could be helpfull.

Saviola

[jeffgordon]

You can try brackets around your expression:

<condition expression="#{contextInstance.variables['tran'] eq 'optionalState1'}"/>

[unless the forum software stripped them]

[jeffgordon]

You may also want to try wrapping your expression in a CDATA section and not using the expression attribute:

<condition><![CDATA[#contextInstance.variables['tran'] eq 'optionalState1'}]]></condition>

[fassihi]

I have the same problem and have tested all these solutions but none have worked so far.
The error that I get is :
"Can't evaluate bean shell script!"