Guided Editor in BRMS / Guvnor Version 5 (Snapshot of 26 June)
by Paul Browne
Folks,
For various reasons I'm trying out the Guided Editor for Business Rules in
the Guvnor Version 5 (Snapshot of 26 June from Hudson, deployed on JBoss App
Server 4.2.2GA).
I've created the Package / Category and uploaded a simple fact model (as
works in BRMS version 4). I create a new business rule using the guided
editor and the screen shows successfully with both 'When' and 'Then'
parts.Assume the next question is due to me missing something, but wanted to
double check:
When I press the green '+' to the right of the screen I am shown the message
/ dialog layer saying '
*Add a condition to the rule... *or* Add an action to the rule.
*Problem is that there doesn't appear to be a way of adding a condition or
action. The only thing I'm seeing in the logs is
* (Contexts.java:flushAndDestroyContexts:335) could not discover
transaction status
*Am I missing something or should I come back to Guvnor later in the
development Cycle?
Thanks
Paul
11 years
unknown error while parsing
by Boschung Daniel
hi folks
drools prompt me to contact the development team. the following error apears, whithout stacktrace, while developing
a rule. maybe the error is known to you?!
thanks for a little statement
daniel
12 years, 5 months
Drools + Spring
by Abu Rasheed
Are there any plans to have Spring support in drools-api? The last mail that
I saw in searching the topic is dated last year, and there are no new
postings related to this.
Does anyone have any success in injecting KnowledgeBase into their apps
using Spring? Is there any examples out there that I can refer to?
Thanks
12 years, 11 months
drools compiler issue
by Abu Rasheed
I'm using the Drools 5.0.0 M5, with Guvnor, when I tried to save and
validate my configuration, I got this error:
[ERR 102] Line 5:63 mismatched input '-'
It's pointing to this line:
import <my pachage path>.package-info
Does drools support package with "-" characters? The package is part of
jaxws generated artifacts.
Thanks
13 years, 2 months
Drools in Google App Engine
by Paul Browne
Folks,
Are there any plans to tweak Drools to allow it to run in a security
constrained environment such as Google App Engine or Applets? I know some of
the other JBoss.org projects have this on the 'todo' list.
When I try to load a simple web application using drools into the Google App
Engine, I get the error below.The app itself is the sample 8 from the
following web page, but tweaked according to the Google 'howto' to get it up
and running in the app engine; http://code.google.com/p/red-piranha/
My understanding of the problem is that drools is using File access to check
if the configuration file exists the first time it is run. This is
constrained in App Engine - just like the J2EE spec says it should be
(although most other app servers allow you to get away with this!). I know
that if I tweak the source code there will be other points where similar
file access is required.
While not trivial, would it be possible to add a one-line check for that the
user has permission to do file.io before calling File.Exists (the
alternative , of catching and ignoring the AccessControlException is ugly!).
The hardest part of this is that the check would need to be added at
multiple points in the Drools source code.
Any thoughts / comments/ suggestions?
Paul
www.firstpartners.net/blog
WARNING: java.security.AccessControlException: access denied
(java.io.FilePermission /home/paul/drools.rulebase.conf read)
13-May-2009 09:04:16 com.google.apphosting.utils.jetty.JettyLogger warn
WARNING: Nested in javax.servlet.ServletException:
java.security.AccessControlException: access denied (java.io.FilePermission
/home/paul/drools.rulebase.conf read):
java.security.AccessControlException: access denied (java.io.FilePermission
/home/paul/drools.rulebase.conf read)
at
java.security.AccessControlContext.checkPermission(AccessControlContext.java:323)
at
java.security.AccessController.checkPermission(AccessController.java:546)
at java.lang.SecurityManager.checkPermission(SecurityManager.java:532)
at
com.google.appengine.tools.development.DevAppServerFactory$CustomSecurityManager.checkPermission(DevAppServerFactory.java:76)
at java.lang.SecurityManager.checkRead(SecurityManager.java:871)
at java.io.File.exists(File.java:731)
at
org.drools.util.ChainedProperties.loadProperties(ChainedProperties.java:225)
at org.drools.util.ChainedProperties.<init>(ChainedProperties.java:59)
at org.drools.util.ChainedProperties.<init>(ChainedProperties.java:31)
at org.drools.util.ChainedProperties.<init>(ChainedProperties.java:25)
at org.drools.RuleBaseConfiguration.init(RuleBaseConfiguration.java:174)
at
org.drools.RuleBaseConfiguration.<init>(RuleBaseConfiguration.java:133)
at org.drools.common.AbstractRuleBase.<init>(AbstractRuleBase.java:147)
at org.drools.reteoo.ReteooRuleBase.<init>(ReteooRuleBase.java:124)
at org.drools.reteoo.ReteooRuleBase.<init>(ReteooRuleBase.java:101)
at org.drools.RuleBaseFactory.newRuleBase(RuleBaseFactory.java:57)
at org.drools.RuleBaseFactory.newRuleBase(RuleBaseFactory.java:38)
at net.firstpartners.drools.RuleRunner.loadRules(RuleRunner.java:39)
at
net.firstpartners.drools.RuleRunner.runStatelessRules(RuleRunner.java:167)
at net.firstpartners.rp2.rp2Servlet.callRules(rp2Servlet.java:96)
at net.firstpartners.rp2.rp2Servlet.service(rp2Servlet.java:137)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:806)
at
org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:487)
at
org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1093)
at
com.google.apphosting.utils.servlet.TransactionCleanupFilter.doFilter(TransactionCleanupFilter.java:43)
at
org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1084)
at
org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:360)
at
org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
at
org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:181)
at
org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:712)
at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:405)
at
com.google.apphosting.utils.jetty.DevAppEngineWebAppContext.handle(DevAppEngineWebAppContext.java:54)
at
org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:139)
at
com.google.appengine.tools.development.JettyContainerService$ApiProxyHandler.handle(JettyContainerService.java:306)
at
org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:139)
at org.mortbay.jetty.Server.handle(Server.java:313)
at
org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:506)
at
org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:830)
at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:514)
at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:211)
at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:381)
at
org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:396)
at
org.mortbay.thread.BoundedThreadPool$PoolThread.run(BoundedThreadPool.java:442)
13 years, 4 months
backward-chaining
by kesslerb＠uni-trier.de
Hi everyone,
I am working on a project that would profit from a backward-chaining
rulesengine. I`ve read in the Drools Expert documentation that you
plan to provide support for it in the future. Is there any concrete
plan to implement it, or any estimation of when would
backward-chaining support be available?
Mariana
13 years, 5 months
Drools Flow and Seam Integration
by Raphael Duarte Paiva
Hello!
I've learned from thiswillwill
post<http://blog.athico.com/2009/06/seam-drools-integration.html> that
there will be Drools Flow support in Seam. My team chose to use JBPM instead
of Drools Flow because of the poor integration between Drools Flow and Seam.
I'd like to know exactly what level of integration you guys are planning to
implement. Will there be features like process persistence managing and
Annotation-based management (Like @StartTask and the like) ? Is there any
guesses on how far in the future this integration is?
Thanks in advance!
--
Abraços
Raphael Duarte Paiva
Graduando em Ciência da Computação
"For millions of years, mankind lived just like the animals. Then something
happened which unleashed the power of our imagination. We learned to talk
[...]" - Stephen Hawking, 1993
13 years, 5 months
Drools Core Error?
by nestabur
Does anyone tried to use the knowledgeAgent with statefulSessions?
I've tried to configure my rule engine obtaining unexpected behaviour.
I configure my statefulSession as follows:
wm = (ReteooStatefulSession) ((KnowledgeBaseImpl) kagent
.getKnowledgeBase()).ruleBase.newStatefulSession(
(SessionConfiguration) sessionConf, env);
ksession = new StatefulKnowledgeSessionImpl(wm, kagent.getKnowledgeBase());
And after updating the KnowledgeBase in the agent I update my ksession:
wm.setRuleBase((InternalRuleBase) ((KnowledgeBaseImpl) kagent
.getKnowledgeBase()).ruleBase);
ksession = new StatefulKnowledgeSessionImpl(wm, kagent.getKnowledgeBase());
Without using entry-points this approach works as expected, but using them
it fails after the first update throwing the error:
Exception while processing message: java.lang.NullPointerException
java.lang.NullPointerException
at
org.drools.reteoo.ReteooFactHandleFactory.newFactHandle(ReteooFactHandleFactory.java:54)
at
org.drools.common.AbstractFactHandleFactory.newFactHandle(AbstractFactHandleFactory.java:79)
at
org.drools.common.AbstractFactHandleFactory.newFactHandle(AbstractFactHandleFactory.java:66)
at
org.drools.common.NamedEntryPoint.insert(NamedEntryPoint.java:109)
at org.drools.common.NamedEntryPoint.insert(NamedEntryPoint.java:80)
at org.drools.common.NamedEntryPoint.insert(NamedEntryPoint.java:28)
Browsing the drools core code I found the line that was throwing the
exception and tried to get the same result by implementing:
if (!((InternalRuleBase) ((KnowledgeBaseImpl)
ksession.getKnowledgeBase()).ruleBase)
.getTypeDeclaration(fact.getClass()) ==
null)
log.info (((InternalRuleBase) ((KnowledgeBaseImpl)
ksession.getKnowledgeBase()).ruleBase)
.getTypeDeclaration(fact.getClass()).getTimestampExtractor().toString());
after updating my ksession. The result was the same, again the same
exception thrown but my logger wrote:
18:01:50,232 INFO [ClassFieldExtractor class=MyPackage.MyFact
field=myTimestampField]
So I dont know why the core is throwing that exception, is that
implementation correct?, any ideas?
Thanks,
Nestor
--
View this message in context: http://www.nabble.com/Drools-Core-Error--tp25188219p25188219.html
Sent from the drools - dev mailing list archive at Nabble.com.
13 years, 6 months
ERROR
by Post Office
The original message was received at Sun, 30 Aug 2009 19:31:14 +0530 from 43.31.9.128
----- The following addresses had permanent fatal errors -----
rules-dev(a)lists.jboss.org
----- Transcript of the session follows -----
... while talking to lists.jboss.org.:
554 5.0.0 Service unavailable; [179.212.6.217] blocked using relays.osirusoft.com, reason: Blocked
Session aborted, reason: lost connection
13 years, 7 months
Returned mail: see transcript for details
by Mail Delivery Subsystem
The original message was received at Tue, 25 Aug 2009 18:36:49 -0500 from [8.200.42.128]
----- The following addresses had permanent fatal errors -----
rules-dev(a)lists.jboss.org
13 years, 7 months
