Error running Drools 5.0 HelloWorldExample on WebSphere 6.1
by Blythe, Marshall
Hi,
I'm evaluating Drools 5.0 for use in a WebSphere 6.1.0.13 (Java 1.5 JRE) environment, and I've encountered an exception that I can't seem to fix. I downloaded the Drools examples and started looking at the HelloWorldExample class. First I executed it on standalone IBM JVM (not in a servlet container), and it worked just fine.
Then I created a simple web app and modified the HelloWorldExample to allow it to be called from a servlet. I copied the Drools JARs to my WEB-INF/lib folder, and I set the classloader mode to PARENT_LAST to ensure my JARs would be picked up before those on the app server. When executed in this environment the HelloWorldExample fails with this exception:
[9/25/09 16:16:23:351 EDT] 00000021 SystemErr R org.drools.runtime.rule.ConsequenceException: [Error: System.out.println( message ): Class org.mvel2.optimizers.impl.refl.ReflectiveAccessorOptimizer can not access a member of class com.ibm.ejs.ras.SystemStream with modifiers "public"]
[Near : {... Unknown ....}]
^
[Line: 1, Column: 0]
The line of code that triggers this exception is "ksession.fireAllRules()" where "ksession" is an instance of StatefulKnowledgeSession. Does anyone know how to solve this problem?
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16 years, 9 months
Agenda Filters usage
by Chris Richmond
Would agenda filters be a good usage in this scenario.
I have a set of objects I want to evaluate in stages, and so I only want
certain rules to fire at certain stages. So the idea would be to have the
main application do some work on those objects then updte and fire rules on
them for stage 1(Agenda Filter 1) where the rule enine would set some bits
based on the objects based on other fields.then the outside appliction would
process some more and then update the objects and fire ther rules for stage
2(Agenda Filter 2) and so on for many stages. This would make it easier to
write rules that only evaluate on the obects at certain stages and would
make it easier to write rules that don't' conflict with each other(i.e. a
rule I only want to evaluate stage 2 objects evaluating stage 1 objects).
IF this *is* a reasonable usage scenario, is there a sample in the
documentation of Firing rules on an agenda filter. I found reference to
writing a rule file that puts rules in certain agendas, but not actually
firing those rules from the client.
Thanks,
Chris
16 years, 9 months
java.lang.NoSuchMethodError (org.eclipse.jdt.internal.compiler.CompilationResult.getProblems())
by Vadivelkumar
Hi,
My Application service(Hilo) is using Jboss Server.
I have used drools rule engine as part of my Application Process.
I have compiled it using simple java void main class, it works fine.
Then i have converted as a simple java process & Deploy as part of
my application service, i'm getting below error in my stack trace.
Note:
1. Drools Version 5.0
2. Eclipse Version 3.5.0 (IDE which i have used to compile)
3. I have already tried the solutions suggested in http://www.jboss.org/community/wiki/RulesTomcat
. Still we are not able to resolve it?
java.lang.NoSuchMethodError:
org.eclipse.jdt.internal.compiler.CompilationResult.getProblems()[Lorg/
eclipse/jdt/core/compiler/CategorizedProblem;
org.drools.commons.jci.compilers.EclipseJavaCompiler
$3.acceptResult(EclipseJavaCompiler.java:321)
org
.eclipse
.jdt.internal.compiler.Compiler.handleInternalException(Compiler.java:
415)
org.eclipse.jdt.internal.compiler.Compiler.compile(Compiler.java:352)
org
.drools
.commons
.jci.compilers.EclipseJavaCompiler.compile(EclipseJavaCompiler.java:351)
org
.drools
.commons
.jci.compilers.AbstractJavaCompiler.compile(AbstractJavaCompiler.java:
51)
org
.drools
.rule.builder.dialect.java.JavaDialect.compileAll(JavaDialect.java:389)
org
.drools
.compiler
.DialectCompiletimeRegistry.compileAll(DialectCompiletimeRegistry.java:
56)
org.drools.compiler.PackageRegistry.compileAll(PackageRegistry.java:74)
org.drools.compiler.PackageBuilder.compileAll(PackageBuilder.java:690)
org.drools.compiler.PackageBuilder.addPackage(PackageBuilder.java:653)
org
.drools.compiler.PackageBuilder.addPackageFromDrl(PackageBuilder.java:
290)
org
.drools
.compiler.PackageBuilder.addKnowledgeResource(PackageBuilder.java:488)
org
.drools
.builder.impl.KnowledgeBuilderImpl.add(KnowledgeBuilderImpl.java:25)
It will be great, if anybody can help it.
Thanks,
Vadi
16 years, 9 months
java.lang.NoSuchMethodError while using Split node
by yuvraj.vohra＠rbs.com
Hi,
I am new to the drools engine. I am using drools 5.0.
Issue is, If I add Split node to process flow, I am getting java.lang.NoSuchMethodError exception .
java.lang.NoSuchMethodError: .......returnValueEvaluator0(Lorg/drools/spi/ProcessContext;)Ljava/lang/Object;
..................ReturnValueEvaluator0Invoker.evaluate(Process................0ReturnValueEvaluator0Invoker.java:14)
at org.drools.workflow.instance.impl.ReturnValueConstraintEvaluator.evaluate(ReturnValueConstraintEvaluator.java:121)
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.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)
Could any one please let me know is this because of some problem with jars in classpath or I am missing something?
Thanks,
Yuvraj Vohra
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16 years, 9 months
Flow
by fero
Hello,
I'm interested in using Drools Flow. I use jBPM as workflow and also Drools
4.x as rule engine but joint of both in Drools 5.x seems amazing. JBPM also
does not support events (signal event and conditional event), which in
Drools are supported and are crucial for me. So I would say many of features
of Drools Flow are missing in jBPM but jBPM is very extensible. If Drools
Flow is as extensible I would rather use that. CEP looks interesting as
well..
1. Exception flow* is also crucial for me. Is it possible to extend Flow to
support it?
2. How to extend Activities. Now it is possible to put the code of activity
in the process definition in MVEL or java. I would prefer to select the
class and provide attributes of a class from process definition as it is in
jBPM (called delagation). Is it possible to create new work items which just
would be configurable from process as log and mail work items are?
3. Is Flow based on its own PVM or jBPM PVM? Is it also possible to extend
flow with new flow constructs?
4. From Human task is possible only one outgoing transitions. We quite often
use multiple outgoing transitions and user choose which one to take. Can it
be done directly?
Thank you
Frank
*Exception Flow is a set of Sequence Flow that originates from an
Intermediate Event that is attached to the boundary of an activity. The
Process will not traverse this flow unless an Event occurs during the
performance of that activity (through an Intermediate Event).
--
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16 years, 9 months
Sharing resources in Guvnor
by Ian Roche
Hi,
Apologies if this topic has been discussed before but I had a search through the archive and didn't find anything.
First, I will explain my planned usage.
We have a set of rules that are growing over time. Rules can be shared across applications.
Ideally I would like to search through my set of rules and assemble them in to a package that would be shipped with a tool.
I don't really want to restrict an application to take all the rules in a package if they only need a subset.
I took a good look at Guvnor with the 5.0 release in May and it seemed to fit the bill.
That was until I noticed that the smallest unit seems to be a package and sharing between packages is not possible.
For my planned usage it seems that a package is too large and what I would need is a solution where a rule is the smallest unit.
I saw that resource sharing was planned in Guvnor for a Sept 09 release. Is that still on track? Would it allow sharing down to the level of rules?
Assuming I have to support this usage what would people recommend?
1) Wait for sharing support in Guvnor
2) Extend guvnor to handle my use case
3) Build a custom BRMS solution and not use Guvnor as this is an unusual case
Thanks,
Ian
16 years, 9 months
Authoring Rules in non-JVM Client Apps
by Ken Archer
The http/xml/json interface provided by drools-server for remote execution of rules from non-JVM apps is wonderful. Is there a similar interface for importing rules authored in non-JVM client apps as xml or drl files? I have not been able to find one. Thanks in advance.
Ken Archer
Telogical Systems
16 years, 9 months
Event Wait Nodo in a ruleflow
by Kevin Alonso
Hello,
I´m working with a simple flow that has a Event Wait node. This node
has the following condition:
- Person()
Being Person a class that is not inserted into the session yet.
When the flow arrives to the event wait node its execution stops and the
test main class execution continues. Here I insert a Person object to
the session, so now, the flow can continue. After wait node I have a
Split node, which has the followings constraints:
- Person()
- not Person()
The flow always take the not Person() way. But now a Person instance is
into the session.
Why is happening this?
Could anyone help me?
Thank you,
Kevin
16 years, 9 months
User interaction while ruleflow is running
by Olaf Raether
Hey,
i have a simple ruleflow with some split and ruleflowgroup components.
Now i want some user interaction while the ruleflow is runing.
For example : a ruleflowgroup is executed, than check a global or what ever
and
fire an event, so i can interact with the user. After the answer modify
a global or the working memory and continue within the ruleflow.
How could i do this very simple. I have a standalone app with drools 5
expert.
No Jboss server running.
Thanks for hints.
--
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16 years, 9 months
compiled package too big
by Ševčík Martin
Hello,
I'm using drools 4.0.7. I have excel with about 4000 rows. After compiling it, the final Package is about 30 MB. And that's only one sheet, I have 3 of them. Total size is about 60MB. It's too big to hold it in memory, but too slow to read it from a file or database every time. Is there any chance to make the package smaller. It's always the same rule, just different values of attributes (that's why we use excel) and I think, after compilation there are many information redundant in the package (they are repeating over and over for every row / rule.
Do you have any solution how to solve this. It's a tariffication algorithm, and the response must be quick. Executing is not a problem, just how to store this big package.
Thank you
Martin
16 years, 9 months
