Help Needed in Drools Flow
by santosh mukherjee
Hi,
I want to add some of my own customized components to Drools Flow components
pannel. How can this be done. Is there some API available to do so ??
Thanks
Santosh Mukherjee
16 years, 1 month
Debug as within Eclipse
by chris richmond
I used the upate site to update my Eclipse Galileo IDE with the drools
tools, created a new drools project, had it add the hello/goodbye test class
and pointed my workspace to the 5.1M binaries. It runs fine, but when I
Debug As -> Drools Application I get the following errors. I get this error
for any drools project I try to debug as Drools application within Eclipse.
Any ideas?
Thanks,
CHris
FATAL ERROR in native method: JDWP No transports initialized,
jvmtiError=AGENT_ERROR_TRANSPORT_INIT(197)
ERROR: transport error 202: connect failed: Connection refused
ERROR: JDWP Transport dt_socket failed to initialize, TRANSPORT_INIT(510)
JDWP exit error AGENT_ERROR_TRANSPORT_INIT(197): No transports initialized
[../../../src/share/back/debugInit.c:690]
16 years, 1 month
Problem with CEP/Fusion rules in Guvnor and RuleAgent: unable to determine operator for symbol [after]
by Michael Legart
Hello Drools users
Given the following simple test rule:
rule "test rule 1"
when
$e : Event();
not( Event(id == $e.id && this after[0s,10s] $e ) )
then
System.out.println("Hello");
end
placed in Guvnor and the following simple test project:
ruleagent.properties:
url=http://localhost:8080/drools-guvnor/org.drools.guvnor.Guvnor/package/defaultPackage/LATEST
TestRuleAgent.java:
RuleAgent agent = RuleAgent.newRuleAgent("/ruleagent.properties");
RuleBase rb = agent.getRuleBase();
throws the following exception:
Exception in thread "main" org.drools.RuntimeDroolsException: unable to determine operator for symbol [after]
at org.drools.base.evaluators.Operator.determineOperator(Operator.java:71)
at org.drools.base.evaluators.Operator.readResolve(Operator.java:106)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at java.io.ObjectStreamClass.invokeReadResolve(ObjectStreamClass.java:1061)
at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1762)
[cut objectinputstream lines]
at org.drools.util.DroolsStreamUtils.streamIn(DroolsStreamUtils.java:189)
at org.drools.util.DroolsStreamUtils.streamIn(DroolsStreamUtils.java:158)
at org.drools.agent.HttpClientImpl.fetchPackage(HttpClientImpl.java:50)
at org.drools.agent.URLScanner.readPackage(URLScanner.java:148)
at org.drools.agent.URLScanner.getChangeSet(URLScanner.java:120)
at org.drools.agent.URLScanner.loadPackageChanges(URLScanner.java:96)
at org.drools.agent.RuleAgent.checkForChanges(RuleAgent.java:410)
at org.drools.agent.RuleAgent.refreshRuleBase(RuleAgent.java:362)
at org.drools.agent.RuleAgent.configure(RuleAgent.java:347)
at org.drools.agent.RuleAgent.init(RuleAgent.java:247)
at org.drools.agent.RuleAgent.newRuleAgent(RuleAgent.java:187)
at org.drools.agent.RuleAgent.newRuleAgent(RuleAgent.java:147)
at org.drools.agent.RuleAgent.newRuleAgent(RuleAgent.java:256)
at ruleagent.RuleAgentTest.main(RuleAgentTest.java:16)
any ideas to what I am doing wrong here?
Thanks
Michael
16 years, 1 month
WorkItemNodeInstance and the on exit action
by Chris Raschl
Hi Kris,
we experienced some troubles with our drools flow integration today
(we upgraded to the lastest snapshot) and I found out that is has to
do with a fix (see [1]) you commited some time ago.
Our problem is, that we access the data submitted by the user to
finish a human task in the on exit action of the human task node
like this:
WorkItemNodeInstance wini = (WorkItemNodeInstance)context.getNodeInstance();
Map<String, Object> result = (Map<String, Object>)wini.getWorkItem().getResult("Result");
This results in a NPE because the workItemId is set to -1 in the WorkItemNodeInstance
before getWorkItem() is called. So getWorkItem() returns null.
Is there a better (recommended) way to work with human task data? Maybe using an
out-mapping?
Thanks,
chris
[1] http://fisheye.jboss.org/browse/JBossRules/trunk/drools-core/src/main/jav...
16 years, 1 month
package registry null / event wait node constraint
by retoy
I'm getting a NullPointerException when trying to add a rule flow into my
knowledgebase.
It occurs on line 119 of org.drools.compiler.ProcessBuilder, because the
pkgRegistry is null.
118: PackageRegistry pkgRegistry =
this.packageBuilder.getPackageRegistry(process.getPackageName());
119: org.drools.rule.Package p = pkgRegistry.getPackage();
The reason for it must somehow be related to the constraint of my event wait
state, since I don't get the exception, when I remove that. The constraint
is just: dummy == "foo", where dummy is a global.
I don't see how any package name should be involved here... Did I miss
something in the user guide?
Thanks for any suggestions how to figure out what the problem is!
Reto
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16 years, 1 month
Drools Guvnor Issues : Default Constructors & Declaring Dialects
by soc.frangis
I have successfully converted a previous rules engine project to Drools and
was attempting to make the next step by trying out Guvnor for the QA/Testing
module.
1)Even though my program executed and ran perfectly in Eclipse, i noticed
the testing QA section of Guvnor would crash with my fact models because i
did not have a default constructor with no arguments. I made the change, but
is this something that is required for Guvnor QA to work properly (all fact
models / POJOs MUST have a default no-arg constructor) OR did i just
configure Guvnor wrong?
I basically solved my problem, just trying to learn why there was a problem
to begin with.
2) Also, I noticed that even though the default dialect is java (and not
specifying it does not cause any issues in Eclipse), the Guvnor QA section
would not understand the rules unless they explicitly have dialect "java" in
their signature. Of course adding it fixes the problem, but again I am
trying to learn why. I assumed since it is the default dialect that it would
not need to be stated. Is this again just the way Guvnor works (doesn't
work) or do i need to configure it a certain way?
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16 years, 1 month
Re: [rules-users] Drools 5.1.0.M2 - WorkItemNodeInstance -- Listeners can't get hold of WorkItem object
by Vijay K Pandey
I guess this problem was due to a fix done in WorkItemNodeInstance? Is this the correct behavior? If yes how do we get hold of "WorkItem" instance in the attached listeners?
http://fisheye.jboss.org/browse/JBossRules/trunk/drools-core/src/main/jav...
Thanks
Vijay
From: Vijay K Pandey
Sent: Tuesday, June 15, 2010 9:20 AM
To: 'Rules Users List'
Subject: RE: Drools 5.1.0.M2 - WorkItemNodeInstance -- Listeners can't get hold of WorkItem object
Any one on this issue? Any Drools Flow expert?
Appreciate your time for taking a look at it.
Thanks
Vijay
From: Vijay K Pandey
Sent: Thursday, June 10, 2010 12:03 PM
To: 'Rules Users List'
Subject: RE: Drools 5.1.0.M2 - WorkItemNodeInstance -- Listeners can't get hold of WorkItem object
Should I log this as a JIRA ticket.
Thanks
Vijay
From: Vijay K Pandey
Sent: Wednesday, June 09, 2010 9:57 AM
To: 'Rules Users List'
Subject: Drools 5.1.0.M2 - WorkItemNodeInstance -- Listeners can't get hold of WorkItem object
Hi,
There is a change done in Drools 5.1.0.M2 - org.drools.workflow.instance.node.WorkItemNodeInstance class in the method
public void triggerCompleted(WorkItem workItem) at line 196 which is setting the workItemId as -1
this.workItemId = -1;
Due to the above change the listeners which are attached to the "complete" event of the work item - such as the method below
public void beforeNodeLeft(ProcessNodeLeftEvent event) are not able to get hold of the associated workitem object as it returns null.
Is there any specific reason that workItemId is set to -1 even before the associated listeners get triggered or is this a bug?
If it was an intended change then how do I get hold of the "WorkItem" object in the attached listeners.
Thanks
Vijay
p.s This change was not there in the snapshot of 18th April 2010 which I was earlier working on. Above is the only change in this class from the snapshot of 18th April and 5.1.0.M2
16 years, 1 month
