Debug as within Eclipse
by chris richmond
I used the upate site to update my Eclipse Galileo IDE with the drools
tools, created a new drools project, had it add the hello/goodbye test class
and pointed my workspace to the 5.1M binaries. It runs fine, but when I
Debug As -> Drools Application I get the following errors. I get this error
for any drools project I try to debug as Drools application within Eclipse.
Any ideas?
Thanks,
CHris
FATAL ERROR in native method: JDWP No transports initialized,
jvmtiError=AGENT_ERROR_TRANSPORT_INIT(197)
ERROR: transport error 202: connect failed: Connection refused
ERROR: JDWP Transport dt_socket failed to initialize, TRANSPORT_INIT(510)
JDWP exit error AGENT_ERROR_TRANSPORT_INIT(197): No transports initialized
[../../../src/share/back/debugInit.c:690]
15 years, 2 months
Persistence issue using Oracle
by ramram
Hi All,
I have been using the H2 in memory database to test all my Drools Flow
scenarios using Guvnor and Gwt Console provided. And I have some questions
to ask and was wondering if someone can help. The main plan now is to switch
from using the H2 in memory database to Persist using the Oracle database.
1- What are the files that should be affected in this switch? or where
should I be looking into?
2- Are the tables created dynamically? and under which schema?
3- is there any test case implemented using this technology?
Thnx in advance for your help
Regards,
Ram
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15 years, 3 months
MVEL strict mode -- when, why?
by Barry Kaplan
I have never gotten any of my rules to compile using mvel strict mode. If I
leave the default I get spews of error messages that I can't make any sense
of. For example with:
---
package systeminsights.plugin.core.schedule
rule "foo"
when
eval(true)
then
// noop
end
---
I get messages like
[Error: Failed to compile: 3 compilation error(s):
- (1,21) unqualified type in strict mode for: plugin
- (1,26) unqualified type in strict mode for: core
- (1,35) unqualified type in strict mode for: schedule]
[Near : {... Unknown ....}]
^
[Line: 1, Column: 0]
If I set strict mode to false all is good.
So, what is actually going on with strict mode? And how does one interpret
messages such as the above?
-barry
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15 years, 3 months
Exception handling policy
by Gerret Hansper
Hello,
I have got a question about Exception handling policy in Drools 5.0.
My issue is a case where a client application triggered rule execution on the
server, which was throwing a ConsequenceException.
The client, not having drools libs in its classpath, then had a
ClassNotFoundException.
I would therefore want to catch the ConsequenceException on the server and throw
an Exception with its cause.
I am not sure however if ConsequenceException.getCause() would always yield a
non-drools Exception or if that might be another drools type.
Also, is it always a ConsequenceException that gets thrown from a session or can
there be other Exception types?
Thanks,
Gerret
15 years, 3 months
Drools Roadmap - Planned Release 5.1 release date
by McDonald, Daniel
Hi,
I was wondering if there is a planned release date for Release 5.1?
Thank you,
Daniel McDonald
Fidelity National Information Services - Research & Development
Office phone: (972) 691-6593
Mobile phone (214) 697-8163
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15 years, 4 months
Drools memory usage issue
by Shah, Malay
Hi,
We have an drools 5.0.1 application that uses StatelessSession and high volume of objects (facts) that we need to apply static rules on, and having out of memory issues doing so. We added the following three properties as given in the drools documentation for decreasing the memory usage:
drools.shadowproxy=false
drools.maintainTms=false
drools.sequential=true
As per the following blog, there is an algorithm to minimize the engine work, and memory usage.
http://blog.athico.com/2007/07/sequential-rete.html
Are the properties above sufficient to trigger this algorithm, or do we need to do write extra code for this?
Also, does the "drools.sequential" property make sure that rules are applied sequentially on facts? If so, is there a hook into the drools engine to figure out which particular rule is consuming more memory or having more execution time?
Thanks in advance.
Malay Shah
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15 years, 4 months
ANT Compile issues
by Bhamidi, Krishna
Hi,
I am using DROOLs 5.0.0 CR1 and use the compiler from Drools-Ant. When I attempt to execute the rules using a rule agent, I get an exception that in part reads
java.lang.NullPointerException
at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1820)
(Full stack follows this e-mail.) However, when I download the pkg file for the same ruleset from Guvnor and use it in the rule agent, it runs fine.
I use the following for building -
<taskdef name="compiler" classname="org.drools.contrib.DroolsCompilerAntTask" classpathref="compiler.classpath" />
<compiler srcdir="../${rulesDirectory}" tofile="../${buildDirectory}/${projectName}_rules.pkg"
classpath="../${buildDirectory}/${projectName}_rules.jar"
binformat="package">
<include name="*.drl" />
<include name="*.brl" />
<include name="*.xml" />
<include name="*.dslr" />
<include name="*.xls" />
</compiler>
What I should do to compile correctly?
Full Stack
java.lang.NullPointerException
at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1820)
at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1719)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1305)
at java.io.ObjectInputStream.readObject(ObjectInputStream.java:348)
at org.drools.rule.DialectRuntimeRegistry.readExternal(DialectRuntimeRegistry.java:41)
at java.io.ObjectInputStream.readExternalData(ObjectInputStream.java:1755)
at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1717)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1305)
at java.io.ObjectInputStream.readObject(ObjectInputStream.java:348)
at org.drools.rule.Package.readExternal(Package.java:197)
at java.io.ObjectInputStream.readExternalData(ObjectInputStream.java:1755)
at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1717)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1305)
at java.io.ObjectInputStream.readObject(ObjectInputStream.java:348)
at org.drools.util.DroolsStreamUtils.streamIn(DroolsStreamUtils.java:189)
at org.drools.util.DroolsStreamUtils.streamIn(DroolsStreamUtils.java:158)
at org.drools.agent.FileScanner.readPackage(FileScanner.java:136)
at org.drools.agent.FileScanner.getChangeSet(FileScanner.java:82)
at org.drools.agent.FileScanner.loadPackageChanges(FileScanner.java:56)
at org.drools.agent.DirectoryScanner.loadPackageChanges(DirectoryScanner.java:69)
at org.drools.agent.RuleAgent.checkForChanges(RuleAgent.java:410)
at org.drools.agent.RuleAgent.refreshRuleBase(RuleAgent.java:362)
at org.drools.agent.RuleAgent.configure(RuleAgent.java:347)
at org.drools.agent.RuleAgent.init(RuleAgent.java:247)
at org.drools.agent.RuleAgent.newRuleAgent(RuleAgent.java:187)
at org.drools.agent.RuleAgent.newRuleAgent(RuleAgent.java:147)
15 years, 4 months
Any news on Drools 5.1
by Chuck Irvine
I am planning on diving into a Drools based workflow related project pretty
soon and have kind of been waiting for 5.1 to come out (or maybe the next
milestone release). Any news on 5.1 availability? Thanks -Chuck
15 years, 4 months
drools expert: memory issues
by Miguel Machado
hi all,
I'm quite new to the drools rule engine and i've been using it for a project where i need to filter events and execute actions accordingly.
I'm currently running a DRL file and creating a stateful session from it, and then running 2/3 facts every time. Every X seconds I collect the available facts and call fireAllRules() + dispose(), always within the same session. The DRL file has circa 2160 rules declared (an external program is producing them), and i'm using the "no-loop", "lock-on-active", "activation-group" and "agenda-group" options on almost every one.
My main problem is that the software is consuming too much memory when it loads the rules to the knowledge base variable, it reaches +300Mb which is just not affordable in this project. Is there any way i can work around this? I've tried setting some configuration properties but to no avail. What techniques may i try in order to reduce memory load on drools startup? What would be the best approach for dealing with so many rules?
Anything would help, thanks in advance,
_ miguel
15 years, 5 months
Extending the "validation of rules" functionality in Guvnor
by Premkumar Stephen
Hello everyone,
Currently, the validate functionality ensures that rules have proper
syntax.
it is possible to extend this functionality so that business use cases might
also be validated? Is there an API/examples to do that.
For eg, in our domain, an object X can be evaluated for 3 criteria ( a, b,
c )
However, we would need to prevent rules written which combine criteria b and
c
Rules can have the combinations ( a,b,c, ab, ac ). Combinations ( bc and abc
) should not be allowed.
Regards,
Prem
15 years, 5 months
