I know one can debug rules (put breakpoints in .drl and ruleflow files) when
running/debugging an application as a Drools Application.
However, I would like to debug rules when my application is running in JBoss AS
- just like we do a normal debugging of a Remote application running in a
different JVM ,by enabling the JDWP on the server
(-Xrunjdwp:transport=dt_socket,address=8787,server=y,suspend=n) and then
connecting to the specified port.
Basically, I would like to be able to debug both my Java classes and rules
together. Is it possible?
I am new to drools community...
I want to develop an expert system for medical application using drools.
can you please let me know how to use history data in drools... Because
as far as i know we have to keep all the data in the working memory to
How should i implement such system?
Would be better if you can provide some reference to existing expert
system implemented using drools.
Thanks in advance.
In three words I can sum up everything I've learned about life: it goes
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In my tests of the 4.0.3, I have some : java.lang.OutOfMemoryError.
So, I try a simple test with 10.000 sequential execution of 1 rule with no
context and just a workingmemorylogger and I have the error :
java.lang.OutOfMemoryError: Java heap space
My code is :
public class ExecReglesMemotyTest
private static final Reader DRL = new
private static final String FICHIER_LOG = "session";
* @param args
public static void main(String args)
PackageBuilder builder = new PackageBuilder();
RuleBase ruleBase = RuleBaseFactory.newRuleBase();
for (int i = 0; i < 10000; i++)
StatefulSession session = ruleBase.newStatefulSession();
WorkingMemoryFileLogger logger = new WorkingMemoryFileLogger(session);
catch (Exception e)
// TODO Auto-generated catch block
with this rule (doesn't matter):
#created on: Fri Nov 09 15:48:45 CET 2007
#list any import classes here.
I try this in 4.0.1, and it's working (no OutOfMemoryError)
What's the problem ?
thanks for any information,
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In order to make writing drl files easy and not requiring writers to be
developers, I have written some JavaAssist code that dynamically creates a
subclass and new methods in memory.
If for example there is a REAL java class called 'com.foo.Instance'. Via
javasssist, I create a new in-memory subclass called 'com.foo.InstanceEx'.
The new class dynamically creates a new getter called getFoo(). The drl
writer would like to directly reference 'foo' in the drl file like so:
i : Instance(foo == 'fee')
The problem is, in order to reference foo, I would need the drl file to do
But I cannot do that because InstanceEx does not exist at runtime. The
error I get, which is an obvious one, is "Unable to create Field Extractor
for 'foo' of '[ClassObjectType class=com.foo.Instance]' in rule 'Test' :
Is there a way to include a dynamic import of a JavaAssist class while I am
constructing the KnowledgeBase instances to run the rules so that I can
reference that new method?
I would hope to have something similar to:
KnowledgeBuilder kbuilder = ....
Any help GREATLY appreciated.
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A quick follow-up: this error occurs only when I have rules using the MVEL dialect. I rewrote the MVEL rule in the HelloWorld.drl to use the Java dialect, and now the problem is gone. I may need to raise this issue on the MVEL mailing list instead.
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I had a very basic doubt. 'Rule Base' and 'Knowledge Base' are two different concepts (may be from implementation point of view )?
I got this doubt when I was going through section '18.104.22.168.Â Drools execution server' of drools guvnor (v5.0) where it was written like :
The drools execution server (drools-server) module is a war which you can deploy to execute "knowledgebases (rulebases)" remotely for any sort of client application
The thing is that , I have created Knowledge base from changeset.xml as follows :
kagent = KnowledgeAgentFactory.newKnowledgeAgent( "MyRuleAgent" );
kagent.applyChangeSet( ResourceFactory.newUrlResource( changesetUrl ) );
kbase = kagent.getKnowledgeBase();
Now if I wish to get Rule Base corresponding to my changeset(or rather my DRL file) using 'this kbase object' , how can I do that ?
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I'm testing the ProcessEventListener on a simple process and I get the
"after" events in reverse order.
Process completed : 1283915643204
Node left: 5: 1283915643268
Node triggered: 5: 1283915643268
Node left: 4: 1283915643268
Node triggered: 4: 1283915643269
Node left: 3: 1283915643269
Node triggered: 3: 1283915643270
Node left: 2: 1283915643270
Node triggered: 2: 1283915643270
Node left: 1: 1283915643270
Node triggered: 1: 1283915643271
Node left: 0: 1283915643271
Node triggered: 0: 1283915643271
Process started : 1283915643271
I'm just printing the node id and the time in milliseconds.
Is this the way is supposed to be?
I guess technically "after" could be anytime after, but if I use the
afterProcessStarted event, I get it after the whole process has
completed!, which it's not useful at all.
The "before" events work as expected I think.
I'm using Drools Flow 5.1.0.