11:25 a.m.
Hi!
How can I access process variables inside split nodes, in fact, in split
contraints?
I accessed a process variable named "count" in an action node like that:
Integer c = (Integer) kcontext.getVariable("count");
kcontext.setVariable("count", ++c);
But, in a split constraint doesn't work. So, my doubts are:
- How is the way in split constraints?
- Is there a simpler way to access process variables in action node?
Thanks!
--
Renato Herebia
10:32 a.m.
You should use a code constraint, that allows you to access the variable
directly (if you define them as variables of your process at least,
click the background of your process and edit the "variables" property).
For example, if you have a variable "count", you can have a code
constraint (MVEL or Java dialect) like:
return count > 10;
Also, inside your actions, you also have direct access to your process
variables, so your action could be written like this:
kcontext.setVariable("count", count++);
Kris
Quoting Renato Herebia <renato.herebia(a)dextra-sw.com>:
Hi!
How can I access process variables inside split nodes, in fact, in
split
contraints?
I accessed a process variable named "count" in an action node like
that:
Integer c = (Integer) kcontext.getVariable("count");
kcontext.setVariable("count", ++c);
But, in a split constraint doesn't work. So, my doubts are:
- How is the way in split constraints?
- Is there a simpler way to access process variables in action node?
Thanks!
--
Renato Herebia
Disclaimer: http://www.kuleuven.be/cwis/email_disclaimer.htm
4:10 p.m.
Kris, thanks for your answer...
I've tried to access the variable in a split constraint (return count != 1;)
with mvel dialect and I got this trace in runtime:
Uncaught exception on client
java.lang.RuntimeException: unable to execute ReturnValueEvaluator
at
org.drools.workflow.instance.impl.ReturnValueConstraintEvaluator.evaluate(ReturnValueConstraintEvaluator.java:124)
at
org.drools.workflow.instance.node.SplitInstance.internalTrigger(SplitInstance.java:62)
at
org.drools.workflow.instance.impl.NodeInstanceImpl.trigger(NodeInstanceImpl.java:111)
at
org.drools.workflow.instance.impl.NodeInstanceImpl.triggerConnection(NodeInstanceImpl.java:141)
at
org.drools.workflow.instance.impl.NodeInstanceImpl.triggerCompleted(NodeInstanceImpl.java:128)
at
org.drools.workflow.instance.impl.ExtendedNodeInstanceImpl.triggerCompleted(ExtendedNodeInstanceImpl.java:37)
at
org.drools.workflow.instance.node.EventBasedNodeInstance.triggerCompleted(EventBasedNodeInstance.java:96)
at
org.drools.workflow.instance.node.EventBasedNodeInstance.triggerCompleted(EventBasedNodeInstance.java:77)
at
org.drools.workflow.instance.node.WorkItemNodeInstance.triggerCompleted(WorkItemNodeInstance.java:192)
at
org.drools.workflow.instance.node.HumanTaskNodeInstance.triggerCompleted(HumanTaskNodeInstance.java:74)
at
org.drools.workflow.instance.node.WorkItemNodeInstance.workItemCompleted(WorkItemNodeInstance.java:246)
at
org.drools.workflow.instance.node.WorkItemNodeInstance.signalEvent(WorkItemNodeInstance.java:222)
at
org.drools.workflow.instance.impl.WorkflowProcessInstanceImpl.signalEvent(WorkflowProcessInstanceImpl.java:258)
at
org.drools.process.instance.impl.DefaultWorkItemManager.completeWorkItem(DefaultWorkItemManager.java:96)
at
org.drools.process.workitem.wsht.WSHumanTaskHandler$GetCompletedTaskResponseHandler.execute(WSHumanTaskHandler.java:282)
at
org.drools.task.service.TaskClientHandler.messageReceived(TaskClientHandler.java:67)
at
org.apache.mina.core.filterchain.DefaultIoFilterChain$TailFilter.messageReceived(DefaultIoFilterChain.java:752)
at
org.apache.mina.core.filterchain.DefaultIoFilterChain.callNextMessageReceived(DefaultIoFilterChain.java:414)
at
org.apache.mina.core.filterchain.DefaultIoFilterChain.access$1200(DefaultIoFilterChain.java:49)
at
org.apache.mina.core.filterchain.DefaultIoFilterChain$EntryImpl$1.messageReceived(DefaultIoFilterChain.java:832)
at
org.apache.mina.filter.codec.ProtocolCodecFilter$ProtocolDecoderOutputImpl.flush(ProtocolCodecFilter.java:379)
at
org.apache.mina.filter.codec.ProtocolCodecFilter.messageReceived(ProtocolCodecFilter.java:173)
at
org.apache.mina.core.filterchain.DefaultIoFilterChain.callNextMessageReceived(DefaultIoFilterChain.java:414)
at
org.apache.mina.core.filterchain.DefaultIoFilterChain.access$1200(DefaultIoFilterChain.java:49)
at
org.apache.mina.core.filterchain.DefaultIoFilterChain$EntryImpl$1.messageReceived(DefaultIoFilterChain.java:832)
at
org.apache.mina.core.filterchain.DefaultIoFilterChain$HeadFilter.messageReceived(DefaultIoFilterChain.java:616)
at
org.apache.mina.core.filterchain.DefaultIoFilterChain.callNextMessageReceived(DefaultIoFilterChain.java:414)
at
org.apache.mina.core.filterchain.DefaultIoFilterChain.fireMessageReceived(DefaultIoFilterChain.java:408)
at
org.apache.mina.core.polling.AbstractPollingIoProcessor.read(AbstractPollingIoProcessor.java:578)
at
org.apache.mina.core.polling.AbstractPollingIoProcessor.process(AbstractPollingIoProcessor.java:540)
at
org.apache.mina.core.polling.AbstractPollingIoProcessor.process(AbstractPollingIoProcessor.java:532)
at
org.apache.mina.core.polling.AbstractPollingIoProcessor.access$400(AbstractPollingIoProcessor.java:58)
at
org.apache.mina.core.polling.AbstractPollingIoProcessor$Worker.run(AbstractPollingIoProcessor.java:857)
at
org.apache.mina.util.NamePreservingRunnable.run(NamePreservingRunnable.java:51)
at
java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:885)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:907)
at java.lang.Thread.run(Thread.java:619)
Caused by: java.lang.ClassCastException: java.lang.Integer cannot be cast to
java.lang.String
at
org.mvel2.math.MathProcessor.getInternalNumberFromType(MathProcessor.java:555)
at org.mvel2.math.MathProcessor._doOperations(MathProcessor.java:155)
at org.mvel2.math.MathProcessor.doOperations(MathProcessor.java:79)
at
org.mvel2.ast.BinaryOperation.getReducedValueAccelerated(BinaryOperation.java:102)
at
org.mvel2.compiler.ExecutableAccessor.getValue(ExecutableAccessor.java:37)
at
org.mvel2.ast.ReturnNode.getReducedValueAccelerated(ReturnNode.java:45)
at org.mvel2.MVELRuntime.execute(MVELRuntime.java:85)
at
org.mvel2.compiler.CompiledExpression.getValue(CompiledExpression.java:107)
at org.mvel2.MVEL.executeExpression(MVEL.java:978)
at
org.drools.base.mvel.MVELReturnValueEvaluator.evaluate(MVELReturnValueEvaluator.java:110)
at
org.drools.workflow.instance.impl.ReturnValueConstraintEvaluator.evaluate(ReturnValueConstraintEvaluator.java:121)
... 36 more
With Java dialect I got a problem when I add the rule flow to the
KnowledgeBuilderFactory:
java.lang.RuntimeException: Process Compilation error :
org.drools.lang.descr.ProcessDescr@69695f
com/sample/Process_com_sample_0.java (9:387) : Incompatible operand
types String and int
at com.sample.ProcessTest.readKnowledgeBase(ProcessTest.java:81)
at com.sample.ProcessTest.main(ProcessTest.java:30)
Using action node, I could get the variable process with mvel dialect in
action just calling:
System.out.println("The counting is: " + count);
If I use Java dialect with the same System.out, I got this problem after add
the rule flow to the KnowledgeBuilderFactory:
java.lang.RuntimeException: unable to execute Action
at
org.drools.workflow.instance.node.ActionNodeInstance.internalTrigger(ActionNodeInstance.java:56)
at
org.drools.workflow.instance.impl.NodeInstanceImpl.trigger(NodeInstanceImpl.java:111)
at
org.drools.workflow.instance.impl.NodeInstanceImpl.triggerConnection(NodeInstanceImpl.java:141)
at
org.drools.workflow.instance.impl.NodeInstanceImpl.triggerCompleted(NodeInstanceImpl.java:128)
at
org.drools.workflow.instance.node.StartNodeInstance.triggerCompleted(StartNodeInstance.java:49)
at
org.drools.workflow.instance.node.StartNodeInstance.internalTrigger(StartNodeInstance.java:41)
at
org.drools.workflow.instance.impl.NodeInstanceImpl.trigger(NodeInstanceImpl.java:111)
at
org.drools.ruleflow.instance.RuleFlowProcessInstance.internalStart(RuleFlowProcessInstance.java:16)
at
org.drools.process.instance.impl.ProcessInstanceImpl.start(ProcessInstanceImpl.java:185)
at
org.drools.workflow.instance.impl.WorkflowProcessInstanceImpl.start(WorkflowProcessInstanceImpl.java:230)
at
org.drools.common.AbstractWorkingMemory.startProcess(AbstractWorkingMemory.java:1639)
at
org.drools.impl.StatefulKnowledgeSessionImpl.startProcess(StatefulKnowledgeSessionImpl.java:272)
at com.sample.ProcessTest.main(ProcessTest.java:42)
Caused by: java.lang.ClassCastException: java.lang.Integer cannot be cast to
java.lang.String
at
com.sample.Process_com_sample_0Action0Invoker.execute(Process_com_sample_0Action0Invoker.java:18)
at
org.drools.workflow.instance.node.ActionNodeInstance.internalTrigger(ActionNodeInstance.java:54)
... 12 more
In this scenario, my doubts are:
- It's necessary any configuration for the access in action/split nodes to
process variables?
- How can I do that?
Thanks in advance.
--
Renato Herebia
5:53 a.m.
Renato,
You stumbled on a bug that was still in Drools 5.0. There are issues in
using an Integer variable inside constraints (as the constraint will try
to interpret it as a String). This has been fixed a long time ago in
the snapshot releases:
http://hudson.jboss.org/hudson/job/drools/lastSuccessfulBuild/artifact/tr...
As workaround, you could also change the type of your variable to Object
and then use java.lang.Integer as class.
Kris
Quoting Renato Herebia <renato.herebia(a)dextra-sw.com>:
Kris, thanks for your answer...
I've tried to access the variable in a split constraint (return count
!= 1;)
with mvel dialect and I got this trace in runtime:
Uncaught exception on client
java.lang.RuntimeException: unable to execute ReturnValueEvaluator
at
org.drools.workflow.instance.impl.ReturnValueConstraintEvaluator.evaluate(ReturnValueConstraintEvaluator.java:124)
at
org.drools.workflow.instance.node.SplitInstance.internalTrigger(SplitInstance.java:62)
at
org.drools.workflow.instance.impl.NodeInstanceImpl.trigger(NodeInstanceImpl.java:111)
at
org.drools.workflow.instance.impl.NodeInstanceImpl.triggerConnection(NodeInstanceImpl.java:141)
at
org.drools.workflow.instance.impl.NodeInstanceImpl.triggerCompleted(NodeInstanceImpl.java:128)
at
org.drools.workflow.instance.impl.ExtendedNodeInstanceImpl.triggerCompleted(ExtendedNodeInstanceImpl.java:37)
at
org.drools.workflow.instance.node.EventBasedNodeInstance.triggerCompleted(EventBasedNodeInstance.java:96)
at
org.drools.workflow.instance.node.EventBasedNodeInstance.triggerCompleted(EventBasedNodeInstance.java:77)
at
org.drools.workflow.instance.node.WorkItemNodeInstance.triggerCompleted(WorkItemNodeInstance.java:192)
at
org.drools.workflow.instance.node.HumanTaskNodeInstance.triggerCompleted(HumanTaskNodeInstance.java:74)
at
org.drools.workflow.instance.node.WorkItemNodeInstance.workItemCompleted(WorkItemNodeInstance.java:246)
at
org.drools.workflow.instance.node.WorkItemNodeInstance.signalEvent(WorkItemNodeInstance.java:222)
at
org.drools.workflow.instance.impl.WorkflowProcessInstanceImpl.signalEvent(WorkflowProcessInstanceImpl.java:258)
at
org.drools.process.instance.impl.DefaultWorkItemManager.completeWorkItem(DefaultWorkItemManager.java:96)
at
org.drools.process.workitem.wsht.WSHumanTaskHandler$GetCompletedTaskResponseHandler.execute(WSHumanTaskHandler.java:282)
at
org.drools.task.service.TaskClientHandler.messageReceived(TaskClientHandler.java:67)
at
org.apache.mina.core.filterchain.DefaultIoFilterChain$TailFilter.messageReceived(DefaultIoFilterChain.java:752)
at
org.apache.mina.core.filterchain.DefaultIoFilterChain.callNextMessageReceived(DefaultIoFilterChain.java:414)
at
org.apache.mina.core.filterchain.DefaultIoFilterChain.access$1200(DefaultIoFilterChain.java:49)
at
org.apache.mina.core.filterchain.DefaultIoFilterChain$EntryImpl$1.messageReceived(DefaultIoFilterChain.java:832)
at
org.apache.mina.filter.codec.ProtocolCodecFilter$ProtocolDecoderOutputImpl.flush(ProtocolCodecFilter.java:379)
at
org.apache.mina.filter.codec.ProtocolCodecFilter.messageReceived(ProtocolCodecFilter.java:173)
at
org.apache.mina.core.filterchain.DefaultIoFilterChain.callNextMessageReceived(DefaultIoFilterChain.java:414)
at
org.apache.mina.core.filterchain.DefaultIoFilterChain.access$1200(DefaultIoFilterChain.java:49)
at
org.apache.mina.core.filterchain.DefaultIoFilterChain$EntryImpl$1.messageReceived(DefaultIoFilterChain.java:832)
at
org.apache.mina.core.filterchain.DefaultIoFilterChain$HeadFilter.messageReceived(DefaultIoFilterChain.java:616)
at
org.apache.mina.core.filterchain.DefaultIoFilterChain.callNextMessageReceived(DefaultIoFilterChain.java:414)
at
org.apache.mina.core.filterchain.DefaultIoFilterChain.fireMessageReceived(DefaultIoFilterChain.java:408)
at
org.apache.mina.core.polling.AbstractPollingIoProcessor.read(AbstractPollingIoProcessor.java:578)
at
org.apache.mina.core.polling.AbstractPollingIoProcessor.process(AbstractPollingIoProcessor.java:540)
at
org.apache.mina.core.polling.AbstractPollingIoProcessor.process(AbstractPollingIoProcessor.java:532)
at
org.apache.mina.core.polling.AbstractPollingIoProcessor.access$400(AbstractPollingIoProcessor.java:58)
at
org.apache.mina.core.polling.AbstractPollingIoProcessor$Worker.run(AbstractPollingIoProcessor.java:857)
at
org.apache.mina.util.NamePreservingRunnable.run(NamePreservingRunnable.java:51)
at
java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:885)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:907)
> at java.lang.Thread.run(Thread.java:619)
> Caused by: java.lang.ClassCastException: java.lang.Integer cannot be
> cast to
> java.lang.String
at
org.mvel2.math.MathProcessor.getInternalNumberFromType(MathProcessor.java:555)
> at
> org.mvel2.math.MathProcessor._doOperations(MathProcessor.java:155)
> at
> org.mvel2.math.MathProcessor.doOperations(MathProcessor.java:79)
at
org.mvel2.ast.BinaryOperation.getReducedValueAccelerated(BinaryOperation.java:102)
> at
> org.mvel2.compiler.ExecutableAccessor.getValue(ExecutableAccessor.java:37)
> at
> org.mvel2.ast.ReturnNode.getReducedValueAccelerated(ReturnNode.java:45)
> at org.mvel2.MVELRuntime.execute(MVELRuntime.java:85)
at
org.mvel2.compiler.CompiledExpression.getValue(CompiledExpression.java:107)
> at org.mvel2.MVEL.executeExpression(MVEL.java:978)
at
org.drools.base.mvel.MVELReturnValueEvaluator.evaluate(MVELReturnValueEvaluator.java:110)
at
org.drools.workflow.instance.impl.ReturnValueConstraintEvaluator.evaluate(ReturnValueConstraintEvaluator.java:121)
> ... 36 more
>
> With Java dialect I got a problem when I add the rule flow to the
> KnowledgeBuilderFactory:
>
> java.lang.RuntimeException: Process Compilation error :
> org.drools.lang.descr.ProcessDescr@69695f
> com/sample/Process_com_sample_0.java (9:387) : Incompatible
> operand
> types String and int
>
> at com.sample.ProcessTest.readKnowledgeBase(ProcessTest.java:81)
> at com.sample.ProcessTest.main(ProcessTest.java:30)
>
>
> Using action node, I could get the variable process with mvel dialect
> in
> action just calling:
>
> System.out.println("The counting is: " + count);
>
> If I use Java dialect with the same System.out, I got this problem
> after add
> the rule flow to the KnowledgeBuilderFactory:
>
> java.lang.RuntimeException: unable to execute Action
at
org.drools.workflow.instance.node.ActionNodeInstance.internalTrigger(ActionNodeInstance.java:56)
at
org.drools.workflow.instance.impl.NodeInstanceImpl.trigger(NodeInstanceImpl.java:111)
at
org.drools.workflow.instance.impl.NodeInstanceImpl.triggerConnection(NodeInstanceImpl.java:141)
at
org.drools.workflow.instance.impl.NodeInstanceImpl.triggerCompleted(NodeInstanceImpl.java:128)
at
org.drools.workflow.instance.node.StartNodeInstance.triggerCompleted(StartNodeInstance.java:49)
at
org.drools.workflow.instance.node.StartNodeInstance.internalTrigger(StartNodeInstance.java:41)
at
org.drools.workflow.instance.impl.NodeInstanceImpl.trigger(NodeInstanceImpl.java:111)
at
org.drools.ruleflow.instance.RuleFlowProcessInstance.internalStart(RuleFlowProcessInstance.java:16)
at
org.drools.process.instance.impl.ProcessInstanceImpl.start(ProcessInstanceImpl.java:185)
at
org.drools.workflow.instance.impl.WorkflowProcessInstanceImpl.start(WorkflowProcessInstanceImpl.java:230)
at
org.drools.common.AbstractWorkingMemory.startProcess(AbstractWorkingMemory.java:1639)
at
org.drools.impl.StatefulKnowledgeSessionImpl.startProcess(StatefulKnowledgeSessionImpl.java:272)
> at com.sample.ProcessTest.main(ProcessTest.java:42)
> Caused by: java.lang.ClassCastException: java.lang.Integer cannot be
> cast to
> java.lang.String
at
com.sample.Process_com_sample_0Action0Invoker.execute(Process_com_sample_0Action0Invoker.java:18)
at
org.drools.workflow.instance.node.ActionNodeInstance.internalTrigger(ActionNodeInstance.java:54)
... 12 more
In this scenario, my doubts are:
- It's necessary any configuration for the access in action/split
nodes to
process variables?
- How can I do that?
Thanks in advance.
--
Renato Herebia
Disclaimer: http://www.kuleuven.be/cwis/email_disclaimer.htm
5563
days inactive
5566
days old
4 comments
2 participants
participants (2)
-
Kris Verlaenen -
Renato Herebia