Re: [rules-users] Importing existing drl into Guvnor
by droolist
I noticed that as well... when you export and import the repository using
Guvnor the versions are lost. That may not be a big deal if you are
versioning your rules in some source control system.
If your Guvnor repository is a DB, you can do a DB import/export with the
tools your DB provides. You will have to play with it a bit to make it work.
One way I think for your multiple DRLs... connect to Guvnor using WebDav and
then copy them into Guvnor
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13 years
Expert Systems and Functional programming?
by Matteo Mortari
Ciao everybody, I have a question I would like to submit to this community,
given Drools is my preferred choice for Expert Systems :)
A quick background: I'm not an Expert Systems / Rule engines expert, but
I'm a happy power user "of Rules" since my CS Engineering thesis, a paper
published, and used it with happy results at work and hobby projects.
Currently boarded on a new project with Rules+Processes at work, and still
very happy, so happy, I'm using Drools again in a new hobby project.
[semi-brag-mode off]
Now, in recent times, I cannot ignore what (apparently) is a strong
renaissance of Functional Programming, specifically all this momentum which
Scala and Java 8's Lambda's are getting.
The Question I'm asking myself: is there a specific, or few, areas where
Functional Programming could actually benefit Expert Systems so much to
actually spawn new paradigms of writing Rules? Or benefit in a new
generation of the Rete algorithm?
Or actually, Functional Programming will spawn a completely different
paradigm of system which will go beyond Expert Systems the way are designed
today?
Ignore my rant if you feel it's too generic, but I really wanted to seize a
chance to ask the question to this community :)
Thank you for your feedback,
Ciao,
Matteo
13 years
Webservice application execution error ( CompositeKnowledgeBuilder)
by Kudos S
Dear All,
I created an axis2 project in WSO2 Carbon studio. This application basically running a Drools CEP application.I added drools 5.5.0 in the build path. In the eclipse console the program is running as standalone . But when I deploy this it into the WSO2 AS and execute the service I am getting the error in eclipse console rather than displaying the results.Please help me this is so important from me to resolve. I deployed the drools jar file inside wso2 application server (\wso2as-4.1.2\repository\lib) then also it showing the error.
Here is my error when I execute the service.
ERROR {org.apache.axis2.rpc.receivers.RPCInOnlyMessageReceiver} - org/drools/builder/CompositeKnowledgeBuilder
java.lang.NoClassDefFoundError: org/drools/builder/CompositeKnowledgeBuilder
at org.drools.builder.impl.KnowledgeBuilderFactoryServiceImpl.newKnowledgeBuilder(KnowledgeBuilderFactoryServiceImpl.java:38)
at org.drools.builder.KnowledgeBuilderFactory.newKnowledgeBuilder(KnowledgeBuilderFactory.java:56)
at Stream.MyTestCep.main(MyTestCep.java:25)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.apache.axis2.rpc.receivers.RPCUtil.invokeServiceClass(RPCUtil.java:212)
at org.apache.axis2.rpc.receivers.RPCInOnlyMessageReceiver.invokeBusinessLogic(RPCInOnlyMessageReceiver.java:66)
at org.apache.axis2.receivers.AbstractMessageReceiver.receive(AbstractMessageReceiver.java:110)
at org.apache.axis2.engine.AxisEngine.receive(AxisEngine.java:181)
at org.apache.axis2.transport.http.HTTPTransportUtils.processHTTPPostRequest(HTTPTransportUtils.java:172)
at org.apache.axis2.transport.http.AxisServlet.doPost(AxisServlet.java:146)
at org.wso2.carbon.core.transports.CarbonServlet.doPost(CarbonServlet.java:199)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:641)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
at org.eclipse.equinox.http.servlet.internal.ServletRegistration.handleRequest(ServletRegistration.java:90)
at org.eclipse.equinox.http.servlet.internal.ProxyServlet.processAlias(ProxyServlet.java:111)
at org.eclipse.equinox.http.servlet.internal.ProxyServlet.service(ProxyServlet.java:67)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
at org.wso2.carbon.bridge.BridgeServlet.service(BridgeServlet.java:164)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:304)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:240)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:164)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:462)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:164)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:100)
at org.wso2.carbon.server.CarbonStuckThreadDetectionValve.invoke(CarbonStuckThreadDetectionValve.java:154)
at org.wso2.carbon.server.TomcatServer$1.invoke(TomcatServer.java:254)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:563)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:399)
at org.apache.coyote.http11.Http11NioProcessor.process(Http11NioProcessor.java:396)
at org.apache.coyote.http11.Http11NioProtocol$Http11ConnectionHandler.process(Http11NioProtocol.java:356)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1534)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
Caused by: java.lang.ClassNotFoundException: org.drools.builder.CompositeKnowledgeBuilder
at org.eclipse.osgi.internal.loader.BundleLoader.findClassInternal(BundleLoader.java:443)
at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:405)
at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:393)
at org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.loadClass(DefaultClassLoader.java:105)
at java.lang.ClassLoader.loadClass(Unknown Source)
... 40 more
[2013-03-15 10:03:42,384] ERROR {org.apache.axis2.receivers.AbstractMessageReceiver} - org.apache.axis2.AxisFault: org/drools/builder/CompositeKnowledgeBuilder
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Here is my POM.XML
<?xml version="1.0" encoding="UTF-8"?>
<project xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd" xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<modelVersion>4.0.0</modelVersion>
<groupId>Stream.MyTestCep</groupId>
<artifactId>MyTestCep</artifactId>
<version>1.0.0</version>
<packaging>service/axis2</packaging>
<name>MyTestCep</name>
<description>MyTestCep</description>
<build>
<plugins>
<plugin>
<groupId>org.wso2.maven</groupId>
<artifactId>maven-axis2-plugin</artifactId>
<version>2.0.3</version>
<extensions>true</extensions>
<executions>
<execution>
<id>aar</id>
<phase>package</phase>
<goals>
<goal>aar</goal>
</goals>
</execution>
</executions>
<configuration />
</plugin>
<plugin>
<artifactId>maven-eclipse-plugin</artifactId>
<version>2.9</version>
<configuration>
<buildcommands>
<buildcommand>org.eclipse.jdt.core.javabuilder</buildcommand>
</buildcommands>
<projectnatures>
<projectnature>org.wso2.developerstudio.eclipse.axis2.project.nature</projectnature>
<projectnature>org.eclipse.jdt.core.javanature</projectnature>
</projectnatures>
</configuration>
</plugin>
</plugins>
</build>
<repositories>
<repository>
<releases>
<updatePolicy>daily</updatePolicy>
<checksumPolicy>ignore</checksumPolicy>
</releases>
<id>wso2-nexus</id>
<url>http://maven.wso2.org/nexus/content/groups/wso2-public/</url>
</repository>
</repositories>
<pluginRepositories>
<pluginRepository>
<releases>
<updatePolicy>daily</updatePolicy>
<checksumPolicy>ignore</checksumPolicy>
</releases>
<id>wso2-nexus</id>
<url>http://maven.wso2.org/nexus/content/groups/wso2-public/</url>
</pluginRepository>
</pluginRepositories>
<dependencies>
<dependency>
<groupId>org.drools</groupId>
<artifactId>drools-core</artifactId>
<version>5.5.0.Final</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>org.drools</groupId>
<artifactId>drools-compiler</artifactId>
<version>5.5.0.Final</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>org.drools</groupId>
<artifactId>knowledge-api</artifactId>
<version>5.5.0.Final</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-nop</artifactId>
<version>1.7.2</version>
</dependency>
</dependencies>
</project>
13 years
Unexpected Accumulate Collect behavior
by rymy8564
I'm using Spring AMQP to read messages from RabbitMQ. After a message is
read it's deserialized into one header (parent) object and multiple detail
(child) objects. Those facts are then inserted into a stateless rule
session. Finally, the updated facts are inserted into a database.
I have several rules that will aggregate the detail facts using either the
collect or accumulate functions. Here's an example.
rule "Header.TotalDuration"
when
h : BresHeader()
n : Number()
from accumulate( d : BresDetail(willSendToInvoice==true, uniqueConfID ==
h.uniqueConfID), sum(d.Duration) )
then
h.TotalDuration = new Integer(n.longValue());
System.out.println("[TotalDuration] rule ran");
end
If I run this once (reading in one message) in jUnit, the TotalDuration is
calculated correctly. If I run it in tomcat (continuously reading messages)
the values for TotalDuration are not correct and increase after each each
pass (message is grabbed, rules ran, facts persisted, repeat) and I can't
figure out why.
Can anyone shed light on this behavior?
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13 years
configuring timings for event expiry
by rule_dev
Hi ,
I was wondering if it is possible to write a rule in such a way that you are
able to set the 'this after' for events using an attribute from a class.
rule "correlate orders"
when
$bo : BuyOrderEvent( $id : id )
$ae : AckEvent( id == $id, this after[0,10s] $bo )
then
// do something
end
in the above rule template I would like to set the "this after [0,10]" part
using a custom value from say a date attribute of the BuyOrderEvent class.
Thanks for your time.
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13 years
