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.processde...@fa54fe" > > Thanks, > Eugene P >
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