Drools with rules from database
by debchamps
Hi
I have the following requirement
The rule is like if(employeeType == $1) set salary = $1
emloyeeType salary
--------------- ---------------
MANAGER 100
SR Manager 200
Director 300
Now new employeeType gets added every day. So the requirement is to update
the knowledgebase without again activating the service.
So how to achieve that with Drools. I am using Drools with a Decision table
for a different requirement in the same project. So if it can be achieved
with decision table it would be great(So new rows will get added to the
decision table dynamically but no column in this case).
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13 years, 9 months
java.lang.NoSuchFieldError: COMPILER_OPT_ALLOW_RESOLVE_INNERCLASSES_WITH_DOTNOTATION
by Suvek
Hi,
I have two projects 'validation' and 'service'. When I execute the rules
from unit tests under 'validation' project everything works fine. When the
same validations are invoked from 'service' project (service has mvn
dependency on validation project) I get the following error on the line
ResourceFactory.newClassPathResource(resourcePath, ResourceType.DRL );
java.lang.NoSuchFieldError:
COMPILER_OPT_ALLOW_RESOLVE_INNERCLASSES_WITH_DOTNOTATION
I looked up for the related issues but everyone says it is version mismatch,
in my case its the same jars that are used in both the cases.
what could be the reason?
thanks
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13 years, 9 months
Conditions on the accumulation function
by senyatur
Hi everyone
We are having rules using drools fusion, sliding windows and accumulation
functions.
Example:
when
Number($count1 : longValue , longValue >= $parameter) from accumulate(
TestingClass($status : status , a=5, b=6) over window:length( 7 ) from
entry-point "EntryPoint" , count($status) )
then
// some java code...
What happens is that only objects of type TestingClass with a=5 and b=6 are
inserted into the window.
What we are trying to achieve is count how many TestingClass objects of *any
last 7* TestingClass objects meet the condition (a=5,b=6).
This obviously isn't met because the window contains only objects meeting
the condition.
Is there a way to put a condition on the *count* function and not on
*window*?
Thanks!
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13 years, 9 months
Create a JPAKnowledgeService via Spring ?
by dunnlow
I am using the drools integration server (v5.4) (thus Spring v3) and trying
to configure a session that persists to a (mysql) database and reloads on
startup.
It seems like JPAKnowledgeService should fit the bill, except I'm at a loss
as to how/if it can be used in a Spring environment.
http://docs.jboss.org/drools/release/5.4.0.Final/knowledge-api-javadoc/or...
I also tried manually configuring persistence like:
<drools:ksession id=".." type="stateful"..>
<drools:configuration>
<drools:jpa-persistence>
<drools:transaction-manager ref="jpaTxManager"/>
<drools:entity-manager-factory ref="jpaEntityManagerFactory"/>
</drools:jpa-persistence>
</drools:configuration>
</drools:ksession>
and this is working (at least, I see the SessionInfo table getting updated),
but then how to reload this session startup (** via Spring)?
Thanks for any insight,
-J
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13 years, 9 months
Need assistance: Guvnor 5.3.1 throws null pointer exception when importing repository.xml
by Nancy Henggeler
Need assistance: Guvnor 5.3.1 throws null pointer exception when importing
repository.xml. Below is the stack trace.
I am running this on glassfish server 3.1.2
Any assistance would be greatly appreciated. Thanks.
[#|2012-08-22T10:30:49.785-0500|WARNING|oracle-glassfish3.1.2|javax.enterprise.system.container.web.com.sun.enterprise.web|_ThreadID=34;_ThreadName=Thread-2;|StandardWrapperValve[RepositoryBackupServlet]:
PWC1406: Servlet.service() for servlet RepositoryBackupServlet threw
exception
java.lang.NullPointerException
at
org.drools.guvnor.server.files.RepositoryBackupServlet$1.execute(RepositoryBackupServlet.java:84)
at
org.drools.guvnor.server.files.RepositoryServlet.doAuthorizedAction(RepositoryServlet.java:75)
at
org.drools.guvnor.server.files.RepositoryBackupServlet.doPost(RepositoryBackupServlet.java:68)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:688)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:770)
at
org.apache.catalina.core.StandardWrapper.service(StandardWrapper.java:1542)
at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:343)
at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:217)
at org.jboss.seam.web.ContextFilter$1.process(ContextFilter.java:42)
at
org.jboss.seam.servlet.ContextualHttpServletRequest.run(ContextualHttpServletRequest.java:65)
at org.jboss.seam.web.ContextFilter.doFilter(ContextFilter.java:37)
at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:256)
at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:217)
at
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:279)
at
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
at
org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:655)
at
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:595)
at
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:161)
at
org.apache.catalina.connector.CoyoteAdapter.doService(CoyoteAdapter.java:331)
at
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:231)
at
com.sun.enterprise.v3.services.impl.ContainerMapper$AdapterCallable.call(ContainerMapper.java:317)
at
com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:195)
at com.sun.grizzly.http.ProcessorTask.invokeAdapter(ProcessorTask.java:849)
at com.sun.grizzly.http.ProcessorTask.doProcess(ProcessorTask.java:746)
at com.sun.grizzly.http.ProcessorTask.process(ProcessorTask.java:1045)
at
com.sun.grizzly.http.DefaultProtocolFilter.execute(DefaultProtocolFilter.java:228)
at
com.sun.grizzly.DefaultProtocolChain.executeProtocolFilter(DefaultProtocolChain.java:137)
at
com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:104)
at
com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:90)
at
com.sun.grizzly.http.HttpProtocolChain.execute(HttpProtocolChain.java:79)
at
com.sun.grizzly.ProtocolChainContextTask.doCall(ProtocolChainContextTask.java:54)
at
com.sun.grizzly.SelectionKeyContextTask.call(SelectionKeyContextTask.java:59)
at com.sun.grizzly.ContextTask.run(ContextTask.java:71)
at
com.sun.grizzly.util.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:532)
at
com.sun.grizzly.util.AbstractThreadPool$Worker.run(AbstractThreadPool.java:513)
at java.lang.Thread.run(Thread.java:722)
|#]
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13 years, 9 months
java.lang.LinkageError
by David Minor
Hi,
We're in the process of moving our web apps from Java 5 to Java 7 and
Drools 3 to Drools 5.4.0. Our rule base is compiled and serialized to
the db by one app, and read from the db and fired by another.
Everything went fine during testing, but when we tried to switch to
production we got this when firing the rule base:
Caused by: java.lang.LinkageError:
ShoppingCart/Rule_CSMEGBUL_b996907c25e3495a94b6b041c1c08c50
at ShoppingCart.Rule_CSMEGBUL_b996907c25e3495a94b6b041c1c08c50Eval0InvokerGenerated.evaluate(Unknown
Source)
at ShoppingCart.Rule_CSMEGBUL_b996907c25e3495a94b6b041c1c08c50Eval0Invoker.evaluate(Unknown
Source)
at org.drools.rule.EvalCondition.isAllowed(EvalCondition.java:114)
at org.drools.reteoo.EvalConditionNode.assertLeftTuple(EvalConditionNode.java:178)
[snip]
Does anyone have any ideas as to what might cause this?
Here is the rule in question if that helps:
rule "CSMEGBUL"
salience -1
agenda-group "SubtotalDependent"
when
delegate: PromotionRuleDelegate ( )
cart: ShoppingCart ( )
eval (
delegate.checkDateRange("1181718000000","1497337200000") )
eval ( delegate.checkEnabled("false") )
eval ( delegate.cartHasPromoCode(cart, "CSMEGBUL") )
eval ( delegate.checkUsage(1,100027) )
then
delegate.applyOrderDiscountAmount(cart, 100027, "10.0");
delegate.promoCodeApplied(cart, "CSMEGBUL");
end
--
_____________
David Minor
13 years, 9 months
Drools Guvnor 5.2 Issue on Websphere AS 7
by Ravikiran
Hi Drools gurus,
I am back again. As most of you know that i had many 'weld' related issues
for deploying Drools Guvnor 5.4 in Webspere 7. After all my trails, i have
decided to go for Guvnor 5.2 (which doesn't have weld+seam dependancies)
deployment on Websphere As7.
This time, I was able to deploy Guvnor 5.2.0 Final on Websphere AS7
successfully without any errors. I have changed the repository to my own
file path. When i launch the guvnor for the first it had asked me to load
the sample packages, i have chosen YES. It was succeffully loaded all sample
packages into my given file path. That's it, after the loading, my browser
window was completely blank except "Drools" logo on top left and
guest[signout] on top right.
Any Idea what was wrong with my setup. What should i do to get the guvnor
web...Please help.
http://localhost:9080/drools-guvnor/org.drools.guvnor.Guvnor/Guvnor.html
I saw view source,
----
----
<link rel="stylesheet" href="css/Guvnor.css">
<link rel="stylesheet" href="css/Guvnor_DecoratedPopupPanel.css">
<link rel="stylesheet" href="css/ruleflow.css">
</head>
<body>
<iframe id="__gwt_historyFrame" style="width: 0; height: 0; border:
0"></iframe>
<div id="loading">
<div class="loading-indicator">
images/loading-icon.gif
Please wait<br />
Loading application...
</div>
</div>
</body>
</html>
-----------------------------------------------------------------------------------------------
Is it something to do with 'org.drools.guvnor.Guvnor.nocache.js'?
thanks a lot in advance.
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13 years, 9 months
Question about the Nature of Ruleflows
by BenjaminWolfe
I'm trying to wrap my mind around the nature of ruleflows -- and I think this
question sums up a bit of my confusion.
I have a stateful knowledge session. The stateful knowledge session has a
ruleflow associated with it. That ruleflow diverges into two branches --
branch A and branch B -- based on a rule constraint. It's an XOR, and the
mvel rule constraints are something like this:
to branch A
$u : User( $i : userId )
exists ( Dog( owner == $i, hasDogTag == false) )
to branch B
$u : User( $i : userId )
not ( Dog( owner == $i, hasDogTag == false) )
Then the two branches converge again. I insert two facts: user 1, whose
dogs all have dog tags, and user 2 whose third dog is missing a tag. Then,
after I insert both facts, I fire all rules.
Should the flow be like this?
user 1: start --> diverge --> branch A (tell him to buy dog tags) -->
converge --> end
user 2: start --> diverge --> branch B (leave him alone) --> converge -->
end
Or does a ruleflow look at the whole session rather than each fact -- in
which case either both users would pass through branch A, or both would pass
through branch B?
If I want the first case to happen, is there something I'm missing in the
implementation? And are there any more details I can add to make my post
more specific? Thank you for your help.
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13 years, 9 months
