This Tuesday!!! - Red Hat & Accenture: BRMS & BPMS Event (London)
by Mark Proctor
http://blog.athico.com/2011/02/red-hat-accenture-brms-bpms-event.html
Reminder that this Tuesday 24th of March you can come and hear all about
Drools and jBPM5!!!!
Registration Page:
https://engage.redhat.com/forms/UK_Event_Accenture290311
Join Red Hat and Accenture on Tuesday 29th March at Accenture Old Bailey
to understand how Business Rules Management Systems (BRMS) and Business
Process Management Systems (BPMS) can help businesses leverage
technology more effectively and increase productivity. See how
Enterprise Open Source is leading the way with powerful capabilities and
industry-leading innovation.
There will be 2.5 hours of technical talks, starting at 9am. Full
timings and agenda here:
http://www.europe.redhat.com/events/rh-accenture-seminar/
Speakers:
Mark Proctor - Drools Co-Founder and Poject Lead
Kris Verlaenen - jBPM Lead
Michael Anstis
Geoffrey de Smet
Talks (from core developers, there are other talks too:
Introduction to Rule Based Systems (Mark Proctor)
Introduces Drools and explains what a rule based system is and how it
works. We will also cover event processing on a rule based system.
Why BPMN2 Matters (Kris Verlaenen)
jBPM5 has just been released as premier Open Source BPMN2
implementation. Come and hear how this changes your whole legacy
approach to BPM.
Using Guvnor for Enterprise Systems (Geoffrey de Smet)
Guvnor provides a web interface to your knowlege systems, such as rules
and bpm. This talk provides a gentle introduction into Guvnor and how to
use it.
Decision Tables in Depth (Michael Anstis)
Decision Tables is now a major focus for us, we want to show you why
we'll have the slicket decision table environment out there.
15 years, 4 months
endless loop even with "no-loop"
by James Gu
Hi, I am working on rule and found that it is very easy to cause endless
loop.
For example:
Rule 1 match status and update message.
Rule 2 match type and update message.
This will cause endless loop even I add "no-loop" on each rule. Is there
anyway to avoid this? for example: each rule only execute one time, or set a
maximum execute times.
rule "rule 1"
no-loop
when
m : Message( status == Message.HELLO)
then
System.out.println( "rule 1" );
m.setMessage( "update 1" );
update( m );
end
rule "rule 2"
no-loop
when
m:Message( type=="type1" )
then
System.out.println( "rule 2" );
m.setMessage( "update 2" );
update( m );
end
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15 years, 4 months
combining fact model and processes
by Jordi Alvarez
Hello, we are starting a project using Drools and we are interested in the
conbination of fact models defined in drl files and processes.
We have been looking for documentation regarding this issue, but we have
seen only examples of combining drl-defined types from within rules.
We are interested in using types defined in drl files (as explained in
section 4.7.2 of the drools engine reference) inside process constraints.
Is this possible?
many thanks in advance,
Jordi
15 years, 4 months
Merge repository in Guvnor and editing brl with eclipse plugin
by ioda100
Hi,
I try to figure out how to import a package from an instance of guvnor to
another instance of guvnor without destroying all the existing repository.
There is an import/export function in the administration part of guvnor but
it export all the repository and when import a repository, it's erasing all
before importing.
What i would like to be able to do is : i have a package with rules,
functions, enum, dsl, test scenarios... under an instance of guvnor and i
have another package under another instance and i would like to import the
second package to the other instance of guvnor without erasing the existing
repository. Is it a way to do this? i can't find it. maybe with the eclipse
plugin? I don't want to import from a drl file because i would loose the
graphical part (use of dsl, enum...).
My second question is that i try to use the guvnor plugin for eclipse to
manage rules in the guvnor repository. I can access to it and read/modify
all but i can't modify the ".brl" files, i get for all the files this
message : "Could not open the editor: An unexpected exception was thrown.
java.lang.NullPointerException
at org.drools.eclipse.rulebuilder.ui.ActionSetFieldWidget.(Unknown Source)
at
org.drools.eclipse.rulebuilder.ui.RuleModeller.addActionSetFieldWidget(Unknown
Source)
at org.drools.eclipse.rulebuilder.ui.RuleModeller.redrawRhs(Unknown Source)
at org.drools.eclipse.rulebuilder.ui.RuleModeller.reloadRhs(Unknown Source)
at org.drools.eclipse.rulebuilder.ui.RuleModeller.reloadWidgets(Unknown
Source)
at org.drools.eclipse.rulebuilder.editors.BrlPage.setModelXML(Unknown
Source)
at org.drools.eclipse.rulebuilder.editors.RuleEditor.pageChange(Unknown
Source)
at
org.eclipse.ui.part.MultiPageEditorPart.setActivePage(MultiPageEditorPart.java:1076)
at
org.eclipse.ui.forms.editor.FormEditor.setActivePage(FormEditor.java:597)
at
org.eclipse.ui.part.MultiPageEditorPart.createPartControl(MultiPageEditorPart.java:361)
at
org.eclipse.ui.internal.EditorReference.createPartHelper(EditorReference.java:662)
at
org.eclipse.ui.internal.EditorReference.createPart(EditorReference.java:462)
at
org.eclipse.ui.internal.WorkbenchPartReference.getPart(WorkbenchPartReference.java:595)
at
org.eclipse.ui.internal.EditorReference.getEditor(EditorReference.java:286)
at
org.eclipse.ui.internal.WorkbenchPage.busyOpenEditorBatched(WorkbenchPage.java:2857)
at
org.eclipse.ui.internal.WorkbenchPage.busyOpenEditor(WorkbenchPage.java:2762)
at org.eclipse.ui.internal.WorkbenchPage.access$11(WorkbenchPage.java:2754)
at org.eclipse.ui.internal.WorkbenchPage$10.run(WorkbenchPage.java:2705)
at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:70)
at
org.eclipse.ui.internal.WorkbenchPage.openEditor(WorkbenchPage.java:2701)
at
org.eclipse.ui.internal.WorkbenchPage.openEditor(WorkbenchPage.java:2685)
at
org.eclipse.ui.internal.WorkbenchPage.openEditor(WorkbenchPage.java:2668)
at org.guvnor.tools.utils.PlatformUtils.openEditor(Unknown Source)
at org.guvnor.tools.views.RepositoryView.doubleClick(Unknown Source)
at org.guvnor.tools.views.RepositoryView.access$4(Unknown Source)
at org.guvnor.tools.views.RepositoryView$7.run(Unknown Source)
at org.guvnor.tools.views.RepositoryView$9.doubleClick(Unknown Source)
at
org.eclipse.jface.viewers.StructuredViewer$1.run(StructuredViewer.java:821)
at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
at org.eclipse.core.runtime.Platform.run(Platform.java:888)
at org.eclipse.ui.internal.JFaceUtil$1.run(JFaceUtil.java:48)
at org.eclipse.jface.util.SafeRunnable.run(SafeRunnable.java:175)
at
org.eclipse.jface.viewers.StructuredViewer.fireDoubleClick(StructuredViewer.java:819)
at
org.eclipse.jface.viewers.AbstractTreeViewer.handleDoubleSelect(AbstractTreeViewer.java:1419)
at
org.eclipse.jface.viewers.StructuredViewer$4.widgetDefaultSelected(StructuredViewer.java:1195)
at
org.eclipse.jface.util.OpenStrategy.fireDefaultSelectionEvent(OpenStrategy.java:238)
at org.eclipse.jface.util.OpenStrategy.access$0(OpenStrategy.java:235)
at org.eclipse.jface.util.OpenStrategy$1.handleEvent(OpenStrategy.java:296)
at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1003)
at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:3910)
at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3503)
at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:2405)
at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:2369)
at org.eclipse.ui.internal.Workbench.access$4(Workbench.java:2221)
at org.eclipse.ui.internal.Workbench$5.run(Workbench.java:500)
at
org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332)
at
org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:493)
at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149)
at
org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:113)
at
org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:194)
at
org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:110)
at
org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:79)
at
org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:368)
at
org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:179)
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 org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:559)
at org.eclipse.equinox.launcher.Main.basicRun(Main.java:514)
at org.eclipse.equinox.launcher.Main.run(Main.java:1311)
at org.eclipse.equinox.launcher.Main.main(Main.java:1287)
"
Thanks in advance for your help.
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15 years, 4 months
Drools 5.2.0-SNAPSHOT: NullPointerException in PatternBuilder#build
by ljnelson
See https://issues.jboss.org/browse/JBRULES-2932.
Stack:
Caused by: java.lang.NullPointerException
at org.drools.rule.builder.PatternBuilder.build(PatternBuilder.java:323)
at org.drools.rule.builder.PatternBuilder.build(PatternBuilder.java:268)
at org.drools.rule.builder.PatternBuilder.build(PatternBuilder.java:107)
at
org.drools.rule.builder.GroupElementBuilder.build(GroupElementBuilder.java:65)
at
org.drools.rule.builder.GroupElementBuilder.build(GroupElementBuilder.java:39)
at
org.drools.rule.builder.GroupElementBuilder.build(GroupElementBuilder.java:65)
at
org.drools.rule.builder.GroupElementBuilder.build(GroupElementBuilder.java:39)
at
org.drools.rule.builder.GroupElementBuilder.build(GroupElementBuilder.java:65)
at org.drools.rule.builder.RuleBuilder.build(RuleBuilder.java:80)
at org.drools.compiler.PackageBuilder.addRule(PackageBuilder.java:1313)
at org.drools.compiler.PackageBuilder.addPackage(PackageBuilder.java:664)
at
org.drools.compiler.PackageBuilder.addPackageFromDrl(PackageBuilder.java:310)
at
org.drools.compiler.PackageBuilder.addKnowledgeResource(PackageBuilder.java:483)
at
org.drools.builder.impl.KnowledgeBuilderImpl.add(KnowledgeBuilderImpl.java:28)
This is on a (monstrous) rules file that has compiled fine for months under
5.1.1 and under earlier 5.2.0-SNAPSHOT versions.
Best,
Laird
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15 years, 4 months
Drools 5.2.0-SNAPSHOT: .drl broken?
by ljnelson
My rule that I'm using in unit testing only looks like this:
rule "Testing contains"
dialect "mvel"
when
Response( $answerSelections : answerSelections )
AnswerSelection( answer.ID in (2, 3) )
then
System.out.println("Testing contains activated")
end
Response has a getAnswerSelections() method. AnswerSelection has a
getAnswer() method. Answer has a getID() method.
During rule compilation, I get the following error:
Unable to Analyse Expression answer.ID == 2 || answer.ID == 3:
[Error: Failed to compile: 1 compilation error(s):
- (1,9) unqualified type in strict mode for: ID]
[Near : {... Unknown ....}]
^
[Line: 1, Column: 0] : [Rule name='Testing contains']
If I rewrite the rule using "||" explicitly I get the same error.
This didn't happen under 5.1.1.
I'm aware that 5.2.0-SNAPSHOT is a...um...work in progress. :-) But the
DRL compilation has worked up till now. Is my rule syntax OK? Do I just
need to wait?
Best,
Laird
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15 years, 4 months
Drool Tutorial
by Heng hh
Hi all
I m new comer in drools. Can some one help me on this?
thanks and best regards
Heng
15 years, 4 months
Sliding windows and event retraction
by jwillans2
Hello,
I am using sliding windows in the form:
Obj(..) over window:length(1) from entry-point EP1
Where many events are being inserted into EP1. Reading the documentation I
expected Drools to infer from the window length that all events on EP1 apart
from the latest one can be retracted, is this correct? The reason I ask is
that I am not seeing retraction of events from EP1 when I debug the session,
and I am see behaviour which suggests the rule is firing against old events
on the entry point.
Basically I want to get to simulate that an entry point can only contain one
event at any point in time and that this event is the latest one to arrive.
Thanks,
James
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15 years, 4 months
