On 02/06/2010 23:08, EugeneP wrote:
Good afternoon
How can I use retract in action or exception handler?
For example,
0. I have a flow diagram;
1. in some node the fact Person( age == 10) is added to the working memory
by 'insert';
2. after some steps, the split node pass the control to the action-node
3. and in this action I need to retract this fact. How?!
The action MVEL code like:
$t : Person( age==10)
retract($t)
That would not be any valid MVEL or Java; you have mixed a rule LHS nd a
rule RHS - neither of which are valid for an action. Firstly you'll need
access to the facthandle, so you'll need to store that as a variable
some how. Then you can do
kcontext.knowledgeRuntime.retract( factHandle );
- does not work b/c of knowledge base errors:
"Could not parse knowledge..."
"Unable to build expression for action..."
"java.lang.Class cannot be cast to org.mvel2.util.MethodStub :
org.drools.lang.descr.ProcessDescr@fa54fe"
Thanks,
Eugene P