needed clarification on decr API
by Sudhir M
Hi,
We have a requirement where we need to have our own rule builder and
we use drools as our runtime engine. We are using drools descr API to
create the drl's as we find it more convenient than using a template
engine. In the new release there is warning that ' usage of the descr
package is discouraged '. Is this package bound to change in the
future releases? or will this package be removed completely?
Please clarify us in this regard to maintain compatibility with future
drools releases.
Thanks,
sudhir.
15 years, 10 months
Re: [rules-users] Possible bug
by Greg Barton
That will not guarentee that the exception will not be thrown:
http://java.sun.com/javase/6/docs/api/java/util/ConcurrentModificationExc...
Single thread modification can throw it.
GreG
On Jun 28, 2010, at 8:34 AM, "PAYET, Manuel" <manuel.payet(a)capgemini.com> wrote:
You should insert
Collections.synchronizedMap(new HashMap());
Instead of new HashMap()
This error is a java error, not a drools one, it only means that two threads are, at the same time, accessing/modifying the same Map.
The reason for this depends of your project
-----Message d'origine-----
De : rules-users-bounces(a)lists.jboss.org [mailto:rules-users-bounces@lists.jboss.org] De la part de Pavel Tavoda
Envoyé : lundi 28 juin 2010 15:29
À : Rules Users List
Objet : [rules-users] Possible bug
Hello,
we are using official 5.0 release and sometimes (very rarely) we get following error:
java.util.ConcurrentModificationException
at java.util.HashMap$HashIterator.nextEntry(HashMap.java:793)
at java.util.HashMap$ValueIterator.next(HashMap.java:822)
at org.drools.reteoo.ClassObjectTypeConf.getMatchingObjectTypes(ClassObjectTypeConf.java:171)
at org.drools.reteoo.ClassObjectTypeConf.getObjectTypeNodes(ClassObjectTypeConf.java:163)
at org.drools.reteoo.EntryPointNode.assertObject(EntryPointNode.java:143)
at org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:1046)
at org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:1001)
at org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:788)
at org.drools.process.command.InsertObjectCommand.execute(InsertObjectCommand.java:22)
at org.drools.process.command.InsertObjectCommand.execute(InsertObjectCommand.java:7)
at org.drools.runtime.impl.BatchExecutionImpl.execute(BatchExecutionImpl.java:23)
at org.drools.runtime.impl.BatchExecutionImpl.execute(BatchExecutionImpl.java:9)
at org.drools.impl.StatelessKnowledgeSessionImpl.execute(StatelessKnowledgeSessionImpl.java:225)
at org.fornax.cartridges.sculptor.framework.drools.DroolsAdvice.applyCompanyPolicy(DroolsAdvice.java:150)
We are using AspectJ advice for starting rule evaluation for every service call. Hope we are doing everything right in code. Full source code of advice can be found at:
http://fisheye3.atlassian.com/browse/fornax/trunk/cartridges/sculptor/for...
Regards
Pavel
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15 years, 10 months
Some Fusion clarification
by djb
Hi all,
I'm trying my hand at CEP for fraud detection (analysing incoming claims to
determine whether they are suspicious), and have 2 question/clarifications.
1.
Is the only difference between a fact and an event that an event has a
timestamp/duration?
I have medical claims coming in, and basically, that is my only event type;
say, ClaimReceivedEvent.
Now, I've got my rule engine working, where Claims are facts. Will I now
just insert my facts as events, and continue as normal, using accumulate and
sliding window syntax?
2.
Most of my rules will have to do with comparing complex variables from the
incoming claims to historical averages. (I assume this is the main use of
Drools Fusion, in general)
Should I just compute these averages in java and insert them into the WM?
If I want to compare monthly averages, (lets say, this month a provider
claims 50% more than last month), am I meant to calculate this beforehand?
Or, do I use pseudo-time to pump through historical events, all the while
firing rules to update the average, until I have processed all of the
historical data into these running average variables, and then switch to
real-time?
I'm having trouble with this big picture.
Thanks,
Daniel
Thanks,
Daniel
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15 years, 10 months
Dynamic Loading of Rules from BRMS
by jillika iyer
hi guys,
I am trying to upload my rules from jboss-brms to my eclipse in order to run
it against the working memory.
The following is my code and change-set.xml file and I am getting the
following error stack ( which is a java error but just attaching it for
giving more info).
I have started the jboss-server and it is connected correctly.
I am getting a java based error which says that it is unable to parse
change-set.xml and unable to connect to the server.
I just want to know if I am not the right path for creating the required
change-set.xml file due to which I am getting the java connection error.
I have just specified the url path in my change-set file and the types of
files it should be looking out for.
What else do I need to incorporate for it to connect to the server???
Please help me. I am relatively new to Drools.
Code in my Runner class:
KnowledgeBase kbase = KnowledgeBaseFactory.newKnowledgeBase();
ResourceFactory.getResourceChangeScannerService().start();
ResourceFactory.getResourceChangeNotifierService().start();
// creating a knowledge agent
KnowledgeAgentConfiguration aconf =
KnowledgeAgentFactory.newKnowledgeAgentConfiguration();
KnowledgeAgent kagent = KnowledgeAgentFactory.newKnowledgeAgent(
"MyAgent", kbase,aconf );
kagent.applyChangeSet( ResourceFactory.newUrlResource("
http://localhost:8280/jboss-brms/org.drools.guvnor.Guvnor/Guvnor.html"));
StatefulKnowledgeSession ksession =
kagent.getKnowledgeBase().newStatefulKnowledgeSession();
// StatelessSession workingMemory = ruleBase.newStatelessSession();
ArrayList<Ip> ipList = new ArrayList<Ip>();
ksession.setGlobal("ipList", ipList);
ksession.insert(al);
ksession.fireAllRules();
ksession.dispose();
my change-set.xml file:
<change-set xmlns='http://drools.org/drools-5.0/change-set'
xmlns:xs='http://www.w3.org/2001/XMLSchema-instance'
xs:schemaLocation='http://drools.org/drools-5.0/change-set.xsd'
>
<add>
<!-- Add for specifying URLs-->
<resource source='http://localhost:8280/jboss-brms' type='DRL' />
<resource source='http://localhost:8280/jboss-brms' type='DSLR' />
<resource source='http://localhost:8280/jboss-brmss/sample-dsl.dsl'
type='DSL' />";
<resource source='http://localhost:8280/jboss-brms' type='BRL' />
</add>
</change-set>
error stack:
java.lang.RuntimeException: Unable to parse ChangeSet
at
org.drools.agent.impl.KnowledgeAgentImpl.getChangeSet(KnowledgeAgentImpl.java:223)
at
org.drools.agent.impl.KnowledgeAgentImpl.applyChangeSet(KnowledgeAgentImpl.java:109)
at com.org.RuleRunner.runStatelessRules(RuleRunner.java:156)
at com.org.RulesTest.main(RulesTest.java:38)
Caused by: java.net.SocketException: Network is unreachable: connect
at java.net.PlainSocketImpl.socketConnect(Native Method)
at java.net.PlainSocketImpl.doConnect(PlainSocketImpl.java:333)
at java.net.PlainSocketImpl.connectToAddress(PlainSocketImpl.java:195)
at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:182)
at java.net.Socket.connect(Socket.java:524)
at java.net.Socket.connect(Socket.java:474)
at sun.net.NetworkClient.doConnect(NetworkClient.java:157)
at sun.net.www.http.HttpClient.openServer(HttpClient.java:388)
at sun.net.www.http.HttpClient.openServer(HttpClient.java:523)
at sun.net.www.http.HttpClient.<init>(HttpClient.java:231)
at sun.net.www.http.HttpClient.New(HttpClient.java:304)
at sun.net.www.http.HttpClient.New(HttpClient.java:321)
at
sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:839)
at
sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:791)
at
sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:716)
at
sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:960)
at
com.sun.org.apache.xerces.internal.impl.XMLEntityManager.setupCurrentEntity(XMLEntityManager.java:973)
at
com.sun.org.apache.xerces.internal.impl.XMLEntityManager.startEntity(XMLEntityManager.java:905)
at
com.sun.org.apache.xerces.internal.impl.XMLEntityManager.startDTDEntity(XMLEntityManager.java:872)
at
com.sun.org.apache.xerces.internal.impl.XMLDTDScannerImpl.setInputSource(XMLDTDScannerImpl.java:282)
at
com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl$DTDDispatcher.dispatch(XMLDocumentScannerImpl.java:1021)
at
com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(XMLDocumentFragmentScannerImpl.java:368)
at
com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:834)
at
com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:764)
at
com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(XMLParser.java:148)
at
com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(AbstractSAXParser.java:1242)
at javax.xml.parsers.SAXParser.parse(SAXParser.java:375)
at org.drools.xml.ExtensibleXmlParser.read(ExtensibleXmlParser.java:255)
at org.drools.xml.ExtensibleXmlParser.read(ExtensibleXmlParser.java:170)
at org.drools.xml.XmlChangeSetReader.read(XmlChangeSetReader.java:48)
at
org.drools.agent.impl.KnowledgeAgentImpl.getChangeSet(KnowledgeAgentImpl.java:221)
... 3 more
Please help me.
Thank you
Jill
15 years, 10 months
Working with DSL files
by jillika iyer
hi,
I am creating dsl files using jboss-brms and importing them to my eclipse
and adding them to the knowledge agent.
Now ideally we need to change a dsl or a brl file to a dslr file inorder for
it to be processed by the knowledgebase.
So when we use the knowledge agent how does it parse the data and create
these files???
Please help me out. I just am trying to add everything directly to my
knowledge base which is obviously wrong.
Thank you
Jill
15 years, 10 months
Object Referencing in Test Scenarios
by Fnu Mahalakshmi
Hi
How can we create test cases in BRMS by giving value of an object??
Example:
Fire{
Room room;
String something;
}
Room{
String value;
}
Test case:
Room [R]
Value 'some_value'
Fire[F]
Room ?????
We cannot give [R] here as it is not recognized.
Is there any way to test this kind of conditions in the test scenarios we create???
Thank you.
M
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15 years, 10 months
Using mvel in RHS with Java code
by wilsonywx
I am trying to use mvel for RHS but Drools gives me BuildError : Unable to
build expression for 'consequence' : null 'i = Util.test();'
The error goes away when I remove the "dialect 'mvel'" line, so the error
must have something to do with using mvel. I think I am missing something
here, but the documentation on MVEL in Drools is really scanty.
Code:
import java.util.*;
import a.b.Util;
rule "Test"
dialect "mvel"
when
eval(true)
then
Util.test();
end
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15 years, 10 months
Minimum jar set in 5.1.0.M2 contains lib/mvel2.jar - a show stopper for us
by Wolfgang Laun
I've read somewhere that the minimum jar set for execution with a
precompiled .pkg is just
drools-api-5.1.0.M2.jar
drools-core-5.1.0.M2.jar
However, trying to run an application with just a .pkg file, this jar set
results in the stack
dump shown below, due to a missing "org.mvel2..." class. Adding
lib/mvel2-2.0.16.jar to the
CLASSPATH fixes this, but (for reasons I don't care to elaborate here) be we
can't have this
in our application.
Can this .jar be avoided?
Note: I'm not using mvel, and the .drl file begins with "package movie;
dialect "java".
-W
Exception in thread "main" java.lang.NoClassDefFoundError:
org/mvel2/integration/impl/MapVariableResolverFactory
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:632)
at
java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:277)
at java.net.URLClassLoader.access$000(URLClassLoader.java:73)
at java.net.URLClassLoader$1.run(URLClassLoader.java:212)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:205)
at java.lang.ClassLoader.loadClass(ClassLoader.java:319)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:294)
at java.lang.ClassLoader.loadClass(ClassLoader.java:264)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:332)
at java.lang.Class.getDeclaredFields0(Native Method)
at java.lang.Class.privateGetDeclaredFields(Class.java:2308)
at java.lang.Class.getDeclaredField(Class.java:1897)
at
java.io.ObjectStreamClass.getDeclaredSUID(ObjectStreamClass.java:1627)
at java.io.ObjectStreamClass.access$700(ObjectStreamClass.java:69)
at java.io.ObjectStreamClass$2.run(ObjectStreamClass.java:442)
at java.security.AccessController.doPrivileged(Native Method)
at java.io.ObjectStreamClass.<init>(ObjectStreamClass.java:430)
at java.io.ObjectStreamClass.lookup(ObjectStreamClass.java:327)
at java.io.ObjectStreamClass.initNonProxy(ObjectStreamClass.java:564)
at
java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:1600)
at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1513)
at
java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1749)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1346)
at java.io.ObjectInputStream.readObject(ObjectInputStream.java:368)
at java.util.HashMap.readObject(HashMap.java:1047)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:616)
at
java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:991)
at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1865)
at
java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1770)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1346)
at java.io.ObjectInputStream.readObject(ObjectInputStream.java:368)
at
org.drools.rule.DialectRuntimeRegistry.readExternal(DialectRuntimeRegistry.java:41)
at
java.io.ObjectInputStream.readExternalData(ObjectInputStream.java:1809)
at
java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1768)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1346)
at java.io.ObjectInputStream.readObject(ObjectInputStream.java:368)
at org.drools.rule.Package.readExternal(Package.java:198)
at
org.drools.definitions.impl.KnowledgePackageImp.readExternal(KnowledgePackageImp.java:99)
at
java.io.ObjectInputStream.readExternalData(ObjectInputStream.java:1809)
at
java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1768)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1346)
at java.io.ObjectInputStream.readObject(ObjectInputStream.java:368)
at java.util.ArrayList.readObject(ArrayList.java:696)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:616)
at
java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:991)
at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1865)
at
java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1770)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1346)
at java.io.ObjectInputStream.readObject(ObjectInputStream.java:368)
at movie.Main.init(Main.java:40)
at movie.Main.main(Main.java:89)
Caused by: java.lang.ClassNotFoundException:
org.mvel2.integration.impl.MapVariableResolverFactory
at java.net.URLClassLoader$1.run(URLClassLoader.java:217)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:205)
at java.lang.ClassLoader.loadClass(ClassLoader.java:319)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:294)
at java.lang.ClassLoader.loadClass(ClassLoader.java:264)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:332)
... 60 more
15 years, 10 months
Looking up values in WHEN block
by Dobedani
Dear All,
I'm trying to develop rules which will help to analyse incoming reports of
disease related symptoms. I have found a way to fill a HashMap with maximum
allowable values specific for various symptoms. I would like to lookup the
relevant value any time a symptom comes in. In the first place, I'm trying
to check whether (1) the HashMap's keySet contains the found symptom i.e. in
the WHEN block - but it does not work as expected. Let alone (2) that I can
lookup the maximum allowable value and check whether it has been exceeded!
It is strange to me that the result of both "actions" can however be printed
out in the THEN block. How to do this? Any help will be appreciated.
Kind regards, Dobedani
Here's some of my Java code:
public class Symptom {
private String name;
private String location;
private int period;
private int numCases;
// getters and setters ...
}
And:
KnowledgeBase kbase = readKnowledgeBase();
StatefulKnowledgeSession ksession = kbase.newStatefulKnowledgeSession();
java.util.Map maxSymptoms = new java.util.HashMap<String, Integer>();
ksession.setGlobal("maxSymptoms", maxSymptoms);
Now, some of the code from my DRL file:
import Symptom;
global java.util.Map maxSymptoms;
function void prepareMap(java.util.Map map) {
if (map.size() == 0) {
map.put("fever", 20);
map.put("diarrhoea", 30);
}
}
rule "Initialisation"
salience 100
when
eval(true); // always!
then
prepareMap(maxSymptoms);
end
rule "Number of cases with particular symptom observed"
dialect "mvel"
when
#conditions
Symptom( symptomName : name );
eval(maxSymptoms.keySet() contains symptomName);
#Symptom( numCases > maxSymptoms[symptomName] );
then
#actions
System.out.println(maxSymptoms.keySet() contains symptomName);
System.out.println( maxSymptoms[symptomName] );
#System.out.println("Number of cases with " + symptomName + "
exceeds maximum ")
end
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15 years, 10 months
Automatic updating of Guvnor Rules appears to be not working.
by Stephen Mcgruer
Hi there. I'm trying to get automatic update of rules working in my
project, and seem to
have run into a problem. As far as I can tell, automatic polling and
updating is turned
on, and claims to update the knowledgebase, but changes to the rules
don't seem to have
any effect. A simple example - if I add the rule:
rule "TestRule"
dialect "mvel"
when
then
System.out.println("Hello, world!");
end
And start my application, I get:
Firing all rules...
Hello, world!
All rules fired.
As expected. If I then change the rule as follows:
rule "TestRule"
dialect "mvel"
when
then
System.out.println("I have changed!");
end
I get this output (timestamps trimmed for readability):
ResourceChangeScanner attempt to scan 1 resources
ResourceChangeScanner modified resource=[UrlResource
path='http://localhost:1337/drools-guvnor/org.drools.guvnor.Guvnor/package/ERMI...']
:
1277371031000 : 1277371254000
ResourceChangeNotification received ChangeSet notification
ResourceChangeScanner thread is waiting for 60
ResourceChangeNotification processing ChangeSet
ResourceChangeNotification ChangeSet modified resource=[UrlResource
path='http://localhost:1337/drools-guvnor/org.drools.guvnor.Guvnor/package/ERMI...']
for listener=org.drools.agent.impl.KnowledgeAgentImpl@e2d0b2
KnowledgeAgent received ChangeSet changed notification
ResourceChangeNotification thread is waiting for queue update
KnowledgAgent applying ChangeSet
KnowledgeAgent ChangeSet requires KnowledgeBuilderKnowledgeAgent
rebuilding KnowledgeBase
using ChangeSet
KnowledgeAgent building resource=[UrlResource
path='http://localhost:1337/drools-guvnor/org.drools.guvnor.Guvnor/package/ERMI...']
KnowledgeAgent adding KnowledgeDefinitionsPackage ERMIE
KnowledgeAgent new KnowledgeBase now built and in use
So, this makes it seem like everything has worked. However, if I
insert a new fact and
fire all rules...
Inserting new fact...
Hello, World!
So, it hasn't worked. What might I have done wrong?
-Stephen
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Scotland, with registration number SC005336.
15 years, 10 months
