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, 6 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, 6 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, 6 months
Exception using persistence
by Robert
Hi, I followed the instructions on setting up the persistence in the
drools flow doc, but I get the following exception:
Exception in thread "main" java.lang.RuntimeException: Could not commit
session
at
org.drools.persistence.session.SingleSessionCommandService.<init>(SingleSessionCommandService.java:133)
at
org.drools.persistence.jpa.impl.JPAKnowledgeServiceProviderImpl.newStatefulKnowledgeSession(JPAKnowledgeServiceProviderImpl.java:44)
at
org.drools.persistence.jpa.JPAKnowledgeService.newStatefulKnowledgeSession(JPAKnowledgeService.java:93)
at
com.rob.server.core.process.drools.tasks.DroolsProcessHandler.<init>(DroolsProcessHandler.scala:130)
at
com.rob.server.core.process.drools.tasks.StartDroolsProcessHandler$.main(DroolsProcessHandler.scala:33)
at
com.rob.server.core.process.drools.tasks.StartDroolsProcessHandler.main(DroolsProcessHandler.scala)
Caused by: javax.naming.NameNotFoundException; remaining name
'UserTransaction'
at org.eclipse.jetty.jndi.NamingContext.lookup(NamingContext.java:576)
at org.eclipse.jetty.jndi.NamingContext.lookup(NamingContext.java:663)
at org.eclipse.jetty.jndi.NamingContext.lookup(NamingContext.java:678)
at
org.eclipse.jetty.jndi.java.javaRootURLContext.lookup(javaRootURLContext.java:110)
at javax.naming.InitialContext.lookup(InitialContext.java:392)
at
org.drools.persistence.session.SingleSessionCommandService.<init>(SingleSessionCommandService.java:109)
... 5 more
I have no idea what this means. I guess SingleSessionCommandService is
looking up for "UserTransaction", but whats the "UserTransaction" ?
Cheers, Rob.
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15 years, 7 months
RuleAgent in webservice
by shekharputtur puttur
Hi All,
I am using drools API, and developed a webservice out of it.
I created rule binary package using BRMS Guvnor.
I used RuleAgent to acces the properties file.
ie RuleAgent agent = RuleAgent.newRuleAgent("/
application.properties");
"application.properties" file was stored in current working directory.
I executed my application using eclipse, it was fine .
For testing purpose i deployed the application in tomcat application
server.
Now it is unable to find "application.properties" file. and shows following
in "catalina.out" file:
java.lang.NullPointerException
at java.util.Properties$LineReader.readLine(Properties.java:418)
at java.util.Properties.load0(Properties.java:337)
at java.util.Properties.load(Properties.java:325)
at org.drools.agent.RuleAgent.loadFromProperties(RuleAgent.java:299)
at org.drools.agent.RuleAgent.newRuleAgent(RuleAgent.java:256)
My question is, in which location should i keep the "application.properties"
file , so that RuleAgent can access it.
Could you please tell me the solution.
Thanks & Regards
Shekhar
15 years, 7 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, 7 months
Using pipelines
by Swindells, Thomas
I've been trying to learn how to use pipelines to execute some rules.
I've had a look at the JaxbSimpleJmsMessengerTest as that seemed a good place to start and copy the code from (using drools 5.0.1).
However running the test doesn't seem to actually run any of the rules - I've tried adding println's but they don't appear, nor do the globals appear to get populated.
What am I missing?
Thomas
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15 years, 7 months
Keeping Flows in Guvnor
by tolitius
Need to host all the flows ( process definitions ) in Guvnor as pre-built
knowledge packages.
I heard that it works out of the box, but other people say it is a "desired"
functionality, and it does not really yet implemented to work.
So what is it in reality? I guess this is a question more to Esteban, but
jump in if you are sure.
Thank you,
/Anatoly
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15 years, 7 months
