java.lang.ArrayIndexOutOfBoundsException thrown in mvel2's compiler when running drools5.3 final.
by Miles Wen
hi all,
the exception below is usually thrown when the system is busy(usually 9-10
am everyday);
The rules runs perfectly when unit test or any other time when the system
is not very busy(like 22:00 - 4:00 every day);
Our system processes 13000000 pieces of data each day, with
4-5 java.lang.ArrayIndexOutOfBoundsException thrown on average.It's not
very often but doubtful.
The logs are shown below:
2012-03-07 10:10:33,683 [] ERROR ruleservice.RuleServiceImpl - Error
occurred while invoking business filter!
java.lang.reflect.InvocationTargetException
at
com.alibaba.china.avatar.offer.rulematch.OfferMatchFilter$$FastClassByCGLIB$$18f6f037.invoke(<generated>)
at net.sf.cglib.reflect.FastMethod.invoke(FastMethod.java:53)
at
com.alibaba.china.ruleservice.RuleServiceImpl.bindParamAndInvoke(RuleServiceImpl.java:264)
at
com.alibaba.china.ruleservice.RuleServiceImpl.match(RuleServiceImpl.java:82)
at sun.reflect.GeneratedMethodAccessor248.invoke(Unknown Source)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at
org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:310)
at
org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:182)
at
org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:149)
at
com.alibaba.china.avatar.interceptor.KeyDataLoggingAfterThrowingInterceptor.invoke(KeyDataLoggingAfterThrowingInterceptor.java:24)
at
org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
at
com.alibaba.dragoon.patrol.spring.DragoonMethodInterceptor.invoke(DragoonMethodInterceptor.java:106)
at
org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
at
org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:204)
at $Proxy16.match(Unknown Source)
at
com.alibaba.china.avatar.offer.decode.OfferMessageAction.run(OfferMessageAction.java:39)
at
com.alibaba.china.rialto.core.module.DefaultActionModule.doWork(DefaultActionModule.java:375)
at
com.alibaba.china.rialto.core.module.DefaultActionModule.runModule(DefaultActionModule.java:252)
at
com.alibaba.china.rialto.core.module.ModuleRunner.run(ModuleRunner.java:31)
at
java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:662)
Caused by: org.drools.RuntimeDroolsException: Exception executing predicate
Helper.containsAny(offerSubject, ((Set)colMap.get("_set_212")))
at
org.drools.rule.PredicateConstraint.isAllowed(PredicateConstraint.java:298)
at org.drools.reteoo.AlphaNode.assertObject(AlphaNode.java:130)
at
org.drools.reteoo.CompositeObjectSinkAdapter.doPropagateAssertObject(CompositeObjectSinkAdapter.java:458)
at
org.drools.reteoo.CompositeObjectSinkAdapter.propagateAssertObject(CompositeObjectSinkAdapter.java:386)
at org.drools.reteoo.ObjectTypeNode.assertObject(ObjectTypeNode.java:215)
at org.drools.reteoo.EntryPointNode.assertObject(EntryPointNode.java:244)
at org.drools.common.NamedEntryPoint.insert(NamedEntryPoint.java:330)
at org.drools.common.NamedEntryPoint.insert(NamedEntryPoint.java:291)
at
org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:886)
at
org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:845)
at
org.drools.impl.StatefulKnowledgeSessionImpl.insert(StatefulKnowledgeSessionImpl.java:255)
at
com.alibaba.china.ruleservice.session.impl.drools5.TransientDrools5Session.insertFact(TransientDrools5Session.java:100)
at
com.alibaba.china.avatar.offer.rulematch.OfferMatchFilter.doFilter(OfferMatchFilter.java:57)
... 23 more
Caused by: [Error: unexpected end of statement]
[Near : {... Helper.containsAny(offerSubject,
((Set)colMap.get("_set_212"))) ....}]
^
[Line: 1, Column: 39]
at org.mvel2.compiler.AbstractParser.nextToken(AbstractParser.java:1215)
at
org.mvel2.compiler.ExpressionCompiler._compile(ExpressionCompiler.java:128)
at org.mvel2.util.ParseTools.subCompileExpression(ParseTools.java:2090)
at org.mvel2.ast.Substatement.<init>(Substatement.java:37)
at org.mvel2.compiler.AbstractParser.nextToken(AbstractParser.java:1062)
at
org.mvel2.compiler.ExpressionCompiler._compile(ExpressionCompiler.java:128)
at org.mvel2.util.ParseTools.subCompileExpression(ParseTools.java:2079)
at
org.mvel2.optimizers.impl.refl.ReflectiveAccessorOptimizer.getMethod(ReflectiveAccessorOptimizer.java:953)
at
org.mvel2.optimizers.impl.refl.ReflectiveAccessorOptimizer.compileGetChain(ReflectiveAccessorOptimizer.java:375)
at
org.mvel2.optimizers.impl.refl.ReflectiveAccessorOptimizer.optimizeAccessor(ReflectiveAccessorOptimizer.java:141)
at org.mvel2.ast.ASTNode.optimize(ASTNode.java:157)
at org.mvel2.ast.ASTNode.getReducedValueAccelerated(ASTNode.java:113)
at org.mvel2.MVELRuntime.execute(MVELRuntime.java:87)
at
org.mvel2.compiler.CompiledExpression.getValue(CompiledExpression.java:122)
at
org.mvel2.compiler.CompiledExpression.getValue(CompiledExpression.java:115)
at org.mvel2.MVEL.executeExpression(MVEL.java:930)
at
org.drools.base.mvel.MVELPredicateExpression.evaluate(MVELPredicateExpression.java:100)
at
org.drools.rule.PredicateConstraint.isAllowed(PredicateConstraint.java:291)
... 35 more
Caused by: java.lang.ArrayIndexOutOfBoundsException
I looks like there's some issue in mvel2's parser.The problem occurs when
dynamic compiling mvel2 code.
And every ArrayIndexOutOfBoundsException is thrown around here:
'Helper.containsAny(offerSubject, ((Set)colMap.get("_set_212")))' .This is
a custom static function call which implements come sort of operation not
supported by drools5.
Is this a bug about mvel2?Or any one encountered this problem also? How
could I avoid it?
Thnaks!
--
Regards.
Miles. Wen
14 years, 3 months
load precompiled rule/ruleflow file in 5.3.0
by womuji
We are upgrading from Drools 5.1 to 5.3.0.Final, and running into issues with
loading precompiled rule/ruleflow files.
Previously, we precompiled our drl files using ant task
"org.drools.contrib.DroolsCompilerAntTask", e.g. rule1.drl to
rule1.drl.rules. We did the similar thing for ruleflow files, i.e.
precompiled all of our rf files to a single ruleflow.flow file. In our java
code, in 5.1, we load them as following:
DroolsObjectInputStream ruleFlowStream = null;
try
{
ruleFlowStream = new DroolsObjectInputStream(
new BufferedInputStream(
resourceLoader.getResource(
"classpath:ruleflow.flow"
).getInputStream()
)
);
org.drools.rule.Package ruleFlow =
(org.drools.rule.Package)ruleFlowStream.readObject();
ruleBase.addPackage(ruleFlow);
}
...
Same thing for the rule files.
My question is:
How do we load the precompiled file in 5.3 (we switch to the KnowledgeBase
API ) so that we can save the compiling time when loading?
Thanks.
--
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14 years, 3 months
how to invoke java method with variable arguments from drl file
by womuji
We are upgrading Drools from 5.1 to 5.3, and running into some issue when
invoking a Java method with
String variable arguments:
methodA(String... params)
how do we invoke this in a drl file? We used to call it in 5.1 as:
objA.methodA({"string1"});
and it works fine. Now in 5.3, it complains that
"unable to resolve method using strict-mode:
objA.methodA([Ljava.lang.Object;)]"
If we tried objA.methodA(new String[]{"string1"});
it complains that
"unable to resolve method using strict-mode:
objA.methodA([Ljava.lang.String;)]"
It passes the rule loading if we change to :
objA.methodA("string1");
but when actually running the rule, we are getting error saying
" unable to resolve method methodA(java.lang.String)"
--
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14 years, 4 months
Raising event signal from work item handler
by Swindells, Thomas
Within a work item, if you need to signal an event how would you do it?
>From a rules task you have access to the kcontext but generically this isn't available.
Thanks,
Thomas
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14 years, 4 months
Drools 5.3 partitioned rule base
by gboro54
I am trying to run a partitioned rule base as we have a need to evaluate a
large number of facts. We have around 160 rules which are coordinated using
jBPM rule-flow groups(intermingled with some lightweight business logic).
The business logic in the process executed quickly(80ms for 10,000 facts)
but the rules take sometime to evaluate(thus why I thought a partitioned
rule base would work). However when I try to run it I get the stack trace
below. Do I need to do something to the session as well?
java.lang.IllegalStateException: Error launching test
com.nasdaq.backoffice.billing.process.PhlxCoreProcessTest public void
com.nasdaq.backoffice.billing.process.PhlxCoreProcessTest.testPhlxCoreProcess()
at
org.jboss.arquillian.protocol.servlet.ServletMethodExecutor.invoke(ServletMethodExecutor.java:122)
at
org.jboss.arquillian.container.test.impl.execution.RemoteTestExecuter.execute(RemoteTestExecuter.java:120)
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.jboss.arquillian.core.impl.ObserverImpl.invoke(ObserverImpl.java:90)
at
org.jboss.arquillian.core.impl.EventContextImpl.invokeObservers(EventContextImpl.java:99)
at
org.jboss.arquillian.core.impl.EventContextImpl.proceed(EventContextImpl.java:81)
at org.jboss.arquillian.core.impl.ManagerImpl.fire(ManagerImpl.java:134)
at org.jboss.arquillian.core.impl.ManagerImpl.fire(ManagerImpl.java:114)
at org.jboss.arquillian.core.impl.EventImpl.fire(EventImpl.java:67)
at
org.jboss.arquillian.container.test.impl.execution.ClientTestExecuter.execute(ClientTestExecuter.java:57)
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.jboss.arquillian.core.impl.ObserverImpl.invoke(ObserverImpl.java:90)
at
org.jboss.arquillian.core.impl.EventContextImpl.invokeObservers(EventContextImpl.java:99)
at
org.jboss.arquillian.core.impl.EventContextImpl.proceed(EventContextImpl.java:81)
at
org.jboss.arquillian.container.test.impl.client.ContainerEventController.createContext(ContainerEventController.java:142)
at
org.jboss.arquillian.container.test.impl.client.ContainerEventController.createTestContext(ContainerEventController.java:129)
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.jboss.arquillian.core.impl.ObserverImpl.invoke(ObserverImpl.java:90)
at
org.jboss.arquillian.core.impl.EventContextImpl.proceed(EventContextImpl.java:88)
at
org.jboss.arquillian.test.impl.TestContextHandler.createTestContext(TestContextHandler.java:89)
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.jboss.arquillian.core.impl.ObserverImpl.invoke(ObserverImpl.java:90)
at
org.jboss.arquillian.core.impl.EventContextImpl.proceed(EventContextImpl.java:88)
at
org.jboss.arquillian.test.impl.TestContextHandler.createClassContext(TestContextHandler.java:75)
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.jboss.arquillian.core.impl.ObserverImpl.invoke(ObserverImpl.java:90)
at
org.jboss.arquillian.core.impl.EventContextImpl.proceed(EventContextImpl.java:88)
at
org.jboss.arquillian.test.impl.TestContextHandler.createSuiteContext(TestContextHandler.java:60)
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.jboss.arquillian.core.impl.ObserverImpl.invoke(ObserverImpl.java:90)
at
org.jboss.arquillian.core.impl.EventContextImpl.proceed(EventContextImpl.java:88)
at org.jboss.arquillian.core.impl.ManagerImpl.fire(ManagerImpl.java:134)
at
org.jboss.arquillian.test.impl.EventTestRunnerAdaptor.test(EventTestRunnerAdaptor.java:111)
at org.jboss.arquillian.junit.Arquillian$6.evaluate(Arquillian.java:263)
at org.jboss.arquillian.junit.Arquillian$4.evaluate(Arquillian.java:226)
at org.jboss.arquillian.junit.Arquillian.multiExecute(Arquillian.java:314)
at org.jboss.arquillian.junit.Arquillian.access$100(Arquillian.java:46)
at org.jboss.arquillian.junit.Arquillian$5.evaluate(Arquillian.java:240)
at
org.junit.runners.BlockJUnit4ClassRunner.runNotIgnored(BlockJUnit4ClassRunner.java:79)
at
org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:71)
at
org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:49)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:193)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:52)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:191)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:42)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:184)
at org.jboss.arquillian.junit.Arquillian$2.evaluate(Arquillian.java:185)
at org.jboss.arquillian.junit.Arquillian.multiExecute(Arquillian.java:314)
at org.jboss.arquillian.junit.Arquillian.access$100(Arquillian.java:46)
at org.jboss.arquillian.junit.Arquillian$3.evaluate(Arquillian.java:199)
at org.junit.runners.ParentRunner.run(ParentRunner.java:236)
at org.jboss.arquillian.junit.Arquillian.run(Arquillian.java:147)
at
org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50)
at
org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
at
org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)
at
org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
at
org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
at
org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)
Caused by: java.io.WriteAbortedException: writing aborted;
java.io.NotSerializableException:
org.drools.impl.StatefulKnowledgeSessionImpl
at java.io.ObjectInputStream.readObject0(Unknown Source)
at java.io.ObjectInputStream.readObject(Unknown Source)
at
org.jboss.arquillian.test.spi.ExceptionProxy.readExternal(ExceptionProxy.java:177)
at java.io.ObjectInputStream.readExternalData(Unknown Source)
at java.io.ObjectInputStream.readOrdinaryObject(Unknown Source)
at java.io.ObjectInputStream.readObject0(Unknown Source)
at java.io.ObjectInputStream.defaultReadFields(Unknown Source)
at java.io.ObjectInputStream.readSerialData(Unknown Source)
at java.io.ObjectInputStream.readOrdinaryObject(Unknown Source)
at java.io.ObjectInputStream.readObject0(Unknown Source)
at java.io.ObjectInputStream.readObject(Unknown Source)
at
org.jboss.arquillian.protocol.servlet.ServletMethodExecutor.execute(ServletMethodExecutor.java:214)
at
org.jboss.arquillian.protocol.servlet.ServletMethodExecutor.executeWithRetry(ServletMethodExecutor.java:140)
at
org.jboss.arquillian.protocol.servlet.ServletMethodExecutor.invoke(ServletMethodExecutor.java:118)
... 75 more
Caused by: java.io.NotSerializableException:
org.drools.impl.StatefulKnowledgeSessionImpl
at java.io.ObjectOutputStream.writeObject0(Unknown Source)
at java.io.ObjectOutputStream.defaultWriteFields(Unknown Source)
at java.io.ObjectOutputStream.writeSerialData(Unknown Source)
at java.io.ObjectOutputStream.writeOrdinaryObject(Unknown Source)
at java.io.ObjectOutputStream.writeObject0(Unknown Source)
at java.io.ObjectOutputStream.writeObject(Unknown Source)
at
org.jboss.arquillian.test.spi.ExceptionProxy.writeExternal(ExceptionProxy.java:227)
at java.io.ObjectOutputStream.writeExternalData(Unknown Source)
at java.io.ObjectOutputStream.writeOrdinaryObject(Unknown Source)
at java.io.ObjectOutputStream.writeObject0(Unknown Source)
at java.io.ObjectOutputStream.defaultWriteFields(Unknown Source)
at java.io.ObjectOutputStream.writeSerialData(Unknown Source)
at java.io.ObjectOutputStream.writeOrdinaryObject(Unknown Source)
at java.io.ObjectOutputStream.writeObject0(Unknown Source)
at java.io.ObjectOutputStream.writeObject(Unknown Source)
at
org.jboss.arquillian.protocol.servlet.runner.ServletTestRunner.writeObject(ServletTestRunner.java:229)
at
org.jboss.arquillian.protocol.servlet.runner.ServletTestRunner.executeTest(ServletTestRunner.java:163)
at
org.jboss.arquillian.protocol.servlet.runner.ServletTestRunner.execute(ServletTestRunner.java:126)
at
org.jboss.arquillian.protocol.servlet.runner.ServletTestRunner.doGet(ServletTestRunner.java:90)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:734)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:847)
at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:329)
at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:248)
at
org.jboss.weld.servlet.ConversationPropagationFilter.doFilter(ConversationPropagationFilter.java:62)
at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:280)
at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:248)
at
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:275)
at
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:161)
at
org.jboss.as.jpa.interceptor.WebNonTxEmCloserValve.invoke(WebNonTxEmCloserValve.java:50)
at
org.jboss.as.web.security.SecurityContextAssociationValve.invoke(SecurityContextAssociationValve.java:154)
at
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:155)
at
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:368)
at
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:877)
at
org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:671)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:930)
at java.lang.Thread.run(Unknown Source)
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14 years, 4 months
facing problems while adding a Rule to DROOLS using java client?
by PC
Hi,
i am using Guvnor-5.2.0 . Through a simple java client class i wanted to
add
a rule at runtime.
below is the snippet of java code i am using to add a rule.
KnowledgeBase knowledgeBase = createKnowledgeBase();
session = knowledgeBase.newStatefulKnowledgeSession();
logger = KnowledgeRuntimeLoggerFactory.newFileLogger(session,
"log/DroolsSample");
KnowledgeRuntimeLoggerFactory.newConsoleLogger(session);
String ruleDescription = "package com.tcube.atyaf.dto;"+
"import
com.tcube.atyaf.dto.EmployeeDataDTO;" +
"rule \"SimpleDRLRule\""+
" @ID(11003588)"+
" lock-on-active true"+
" salience -11"+
" dialect 'mvel'"+
" when m :
EmployeeDataDTO(empName==\"PC\");"+
" then System.out.println(
\"*************rule executed\");" +
" m.setDesignation( \"Manager
,Additional Duties & Additional hike
!!!\" );"+
" update( m );"+
" end";
byte[] data = ruleDescription.getBytes();
KnowledgeBuilder kbuilder =
KnowledgeBuilderFactory.newKnowledgeBuilder(knowledgeBase);
kbuilder.add( ResourceFactory.newClassPathResource("ChangeSet.xml"),
ResourceType.CHANGE_SET );
kbuilder.add( ResourceFactory.newClassPathResource("TestRule.drl"),
ResourceType.DRL);
kbuilder.add(ResourceFactory.newByteArrayResource(data),
ResourceType.DRL);
if(kbuilder.hasErrors()) {
System.out.println( kbuilder.getErrors() );
return;
}
Collection<KnowledgePackage> kpkgs = kbuilder.getKnowledgePackages();
knowledgeBase.addKnowledgePackages( kpkgs );
emp = new EmployeeDataDTO();
emp.setEmpNo(1);
emp.setEmpName("PC");
emp.setAge(29);
emp.setSalary(new BigDecimal("6500"));
session.insert(emp);
session.fireAllRules();
I am getting all the rules executed as per exceptation since it is in the
same session, however the new rules that i have added are not reflected in
Drools-Guvnor UI....
please help me on code for deploying the knowldgeBase/Package(kpkgs) to
Drools-Guvnor UI..
-----
PC
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14 years, 4 months
Fact Instance "lifetime" in knowledge session
by Anne Fiore
Hi,
I'm very new to drools and am trying to understand how "facts" are managed
by the knowledge session. I've been experimenting with a simple example
using drools 5.3.0. I created a simple Account class that has a single
"balance" attribute. My rule tests the balance and prints a message if it
is less than 100. I am creating a new instance of Account in my main method
and inserting it into a stateful knowledge session. I put this into a
loop that runs 3 times and never dispose of the session. Each of my
Account instances has a balance less that 100. Here is a portion of the
code:
public static final void main(String[] args) throws InterruptedException
{
KnowledgeBase knowledgeBase = createKnowledgeBase();
StatefulKnowledgeSession session =
knowledgeBase.newStatefulKnowledgeSession();
for (int i = 0; i < 3; i++)
{
try
{
Account account = new Account();
switch (i)
{
case 0: account.setBalance(95);
break;
case 1: account.setBalance(85);
break;
case 2: account.setBalance(80);
break;
default: account.setBalance(80);
}
session.insert(account);
session.fireAllRules();
}
catch (Exception e)
{
System.out.println("Exception: " + e.toString());
}
Thread.sleep(1000);
}
}
My rule is:
rule "basic rule"
when $a : Account (balance < 100) // condition
then System.out.println("Account balance " + $a.getBalance() + " is less
than 100"); // consequence
end
What I see is that each time the loop executes only the last instance of
Account seems to get triggered. I expected that each time I call
"fireAllRules" it would examine all the facts in the session and execute
them. So I thought the first time the loop runs I would get 1 activation,
the second time the loop runs I get 2 activations, etc.
Are all 3 instances of Account still in the working memory or is the latest
instance replacing the existing one? Or, once a fact triggers the rules
engine, does it not trigger it again?
Thanks for any insights,
Anne
14 years, 4 months
Drools & jBPM Event : London 8th March 2012
by Mark Proctor
http://blog.athico.com/2012/02/drools-jbpm-event-london-8th-march-2012.html
-----
Register now to join us for the free Drools & jBPM London 2012 event,
hurry limited spaces :)
http://redhat-mail.com/t/XRU-OE4J-824IMOYW1D/cr.aspx
When Thursday 8th March
Where Stationers Hall, London
Agenda trans
trans trans trans
trans
trans
09:00 trans Registration, tea and coffee
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09:30 trans Introduction/ Welcome
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09:45 trans Rules, Events & Processes: the Open Source way
Mark Proctor - Worldwide Technical Lead for BRMS & BPMS, Red Hat
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10:45 trans Decision Tables
Michael Anstis, JBoss Core Developer, Red Hat
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11:15 trans Tea/Coffee Break
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11:30 trans BPMN2 and jBPM5
Kris Verlaenen, JBoss Core Developer, Red Hat
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12:15 trans Solving Planning Problems
Geoffrey de Smet, JBoss Core Developer, Red Hat
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12:45 trans Case Studies
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13:00 trans Lunch and Networking
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14 years, 4 months
