StatefulKnowledgeSession.startProcess not thread-safe ?
by OptimusPrime
Hello,
I wrote a micro benchmark in order to test the performance of Drools Flow
5.1.0 in single and multi-threaded environments.
And I noticed that, when 2 threads call startProcess() at the same time
(Intel Core 2 Duo CPU), the returned process instance IDs are the same.
I checked the code and it seems there is no locking mechanism in the
org.drools.process.instance.impl.DefaultProcessInstanceManager class for the
id creation.
Is this a bug or am I missing something ?
Thanks
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15 years, 7 months
Exception while loading session from JPA store
by jawa
Hi,
I've got a drools application running with EJB3 and JBoss 5.1. It works fine
but most of the times it throws exception while trying to load drools
session from JPA. My flow has got user tasks so it stops at places and get
stored in db using JPA. Then I try to load it by providing the session id
which does exist in database but it fails to load with following exception:
Caused by: Could not commit session
2010-12-21 00:47:16,453 ERROR [STDERR] (pool-37-thread-1)
java.lang.IllegalStateException: Wrong tx on thread: expected
TransactionImple < ac, BasicAction: a64360d:8184:4d0ff52a:18d status:
ActionStatus.ABOR
TED >, actual null
2010-12-21 00:47:16,453 ERROR [STDERR] (pool-37-thread-1) at
org.jboss.aspects.tx.TxPolicy.endTransaction(TxPolicy.java:157)
2010-12-21 00:47:16,453 ERROR [STDERR] (pool-37-thread-1) at
org.jboss.aspects.tx.TxPolicy.invokeInOurTx(TxPolicy.java:87)
2010-12-21 00:47:16,454 ERROR [STDERR] (pool-37-thread-1) at
org.jboss.aspects.tx.TxInterceptor$Required.invoke(TxInterceptor.java:190)
2010-12-21 00:47:16,454 ERROR [STDERR] (pool-37-thread-1) at
org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
2010-12-21 00:47:16,454 ERROR [STDERR] (pool-37-thread-1) at
org.jboss.aspects.tx.TxPropagationInterceptor.invoke(TxPropagationInterceptor.java:76)
2010-12-21 00:47:16,454 ERROR [STDERR] (pool-37-thread-1) at
org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
2010-12-21 00:47:16,454 ERROR [STDERR] (pool-37-thread-1) at
org.jboss.ejb3.tx.NullInterceptor.invoke(NullInterceptor.java:42)
2010-12-21 00:47:16,454 ERROR [STDERR] (pool-37-thread-1) at
org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
2010-12-21 00:47:16,454 ERROR [STDERR] (pool-37-thread-1) at
org.jboss.ejb3.security.Ejb3AuthenticationInterceptorv2.invoke(Ejb3AuthenticationInterceptorv2.java:186)
2010-12-21 00:47:16,454 ERROR [STDERR] (pool-37-thread-1) at
org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
2010-12-21 00:47:16,454 ERROR [STDERR] (pool-37-thread-1) at
org.jboss.ejb3.ENCPropagationInterceptor.invoke(ENCPropagationInterceptor.java:41)
2010-12-21 00:47:16,454 ERROR [STDERR] (pool-37-thread-1) at
org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
2010-12-21 00:47:16,454 ERROR [STDERR] (pool-37-thread-1) at
org.jboss.ejb3.BlockContainerShutdownInterceptor.invoke(BlockContainerShutdownInterceptor.java:67)
2010-12-21 00:47:16,454 ERROR [STDERR] (pool-37-thread-1) at
org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
2010-12-21 00:47:16,454 ERROR [STDERR] (pool-37-thread-1) at
org.jboss.aspects.currentinvocation.CurrentInvocationInterceptor.invoke(CurrentInvocationInterceptor.java:67)
2010-12-21 00:47:16,454 ERROR [STDERR] (pool-37-thread-1) at
org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
2010-12-21 00:47:16,454 ERROR [STDERR] (pool-37-thread-1) at
org.jboss.ejb3.stateless.StatelessContainer.dynamicInvoke(StatelessContainer.java:421)
2010-12-21 00:47:16,454 ERROR [STDERR] (pool-37-thread-1) at
org.jboss.ejb3.remoting.IsLocalInterceptor.invokeLocal(IsLocalInterceptor.java:85)
2010-12-21 00:47:16,454 ERROR [STDERR] (pool-37-thread-1) at
org.jboss.ejb3.remoting.IsLocalInterceptor.invoke(IsLocalInterceptor.java:72)
2010-12-21 00:47:16,454 ERROR [STDERR] (pool-37-thread-1) at
org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
2010-12-21 00:47:16,454 ERROR [STDERR] (pool-37-thread-1) at
org.jboss.aspects.remoting.PojiProxy.invoke(PojiProxy.java:62)
2010-12-21 00:47:16,454 ERROR [STDERR] (pool-37-thread-1) at
$Proxy678.invoke(Unknown Source)
Does anyone know how to get around this issue?
Thanks
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15 years, 7 months
DataBase Configuration for Drools
by wasim.khan318
Hi every body i am new to Drools section . What i want to achive in drool
let me axplain with example.
When
Price==$price
then
// some code
what we are trying to do is some how value of $price comes from
database.rather hard coding it
what i have did
1. Using jboss developer studio for developing Drool Application
2. Using MySql DataBase
3. My Class File
public static class Applicant {
//public static final int HELLO = 0;
//public static final int GOODBYE = 1;
private String Name;
private int Price;
//private String message;
//private int status;
public String getName()
{
return this.Name;
}
public void setName( String name)
{
this.Name=name;
}
public int getPrice()
{
return this.Price;
}
public void setPrice(int price)
{
this.Price=price;
}
public String GetData()
{
String p=null;
Connection con = null;
try {
Class.forName("com.mysql.jdbc.Driver").newInstance();
con = DriverManager.getConnection("my connection info ");
if(!con.isClosed())
System.out.println("Successfully connected to " +
"MySQL server using TCP/IP...");
} catch(Exception e) {
System.err.println("Exception: " + e.getMessage());
} finally {
}
try{
Statement smt=con.createStatement();
ResultSet rs=smt.executeQuery("select ItenPrice from Item Where
ItemId= 1");
while(rs.next())
{
p=rs.getString("ItenPrice");
}
}
catch(Exception a)
{
System.err.println("Exception: " + a.getMessage());
}
return p;
}
public void GetNewdata(Applicant Ap)
{
Ap.GetData();
}
/*
public String getMessage() {
return this.message;
}
public void setMessage(String message) {
this.message = message;
}
public int getStatus() {
return this.status;
}
public void setStatus(int status) {
this.status = status;
}*/
}
4. My drools File
package com.sample
import com.sample.DroolsTest.Applicant;
rule "Hello World"
when
A:Applicant( price<20 )
then
String a=A.GetData();
System.out.println( a );
end
5. what i want in when section insted of writing 20 i can write GetData()
which is returning value from data base, it is working fine in then section
but firing error in when section
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15 years, 7 months
Deploying Guvnor 5.1 on Glassfish v3
by alim
Hello,
I downloaded Guvnor, web based BRMS (WAR) Version 5.1 and tried to deploy it
on Glassfish v3.
Unfortunately without success.
To be more specific:
I put "drools-5.1.1-guvnor.war" into
{glassfish_home}\domains\{configuration}\autodeploy and started Glassfish
within Eclipse 3.5, using Java 6.
I get following error:
Exception while invoking class org.glassfish.ejb.startup.EjbDeployer load
method
java.lang.RuntimeException: Unable to load EJB module. DeploymentContext
does not contain any EJB Check archive to ensure correct packaging for
C:\glassfishv3\glassfish\domains\domain1\applications\drools-5.1.1-guvnor
at org.glassfish.ejb.startup.EjbDeployer.load(EjbDeployer.java:133)
at org.glassfish.ejb.startup.EjbDeployer.load(EjbDeployer.java:63)
at org.glassfish.internal.data.ModuleInfo.load(ModuleInfo.java:175)
at
org.glassfish.internal.data.ApplicationInfo.load(ApplicationInfo.java:216)
at
com.sun.enterprise.v3.server.ApplicationLifecycle.deploy(ApplicationLifecycle.java:338)
at
com.sun.enterprise.v3.server.ApplicationLifecycle.deploy(ApplicationLifecycle.java:183)
at
org.glassfish.deployment.admin.DeployCommand.execute(DeployCommand.java:272)
at
com.sun.enterprise.v3.admin.CommandRunnerImpl$1.execute(CommandRunnerImpl.java:310)
at
com.sun.enterprise.v3.admin.CommandRunnerImpl.doCommand(CommandRunnerImpl.java:320)
at
com.sun.enterprise.v3.admin.CommandRunnerImpl.doCommand(CommandRunnerImpl.java:1176)
at
com.sun.enterprise.v3.admin.CommandRunnerImpl.access$900(CommandRunnerImpl.java:83)
at
com.sun.enterprise.v3.admin.CommandRunnerImpl$ExecutionContext.execute(CommandRunnerImpl.java:1235)
at
org.glassfish.deployment.autodeploy.AutoOperation.run(AutoOperation.java:141)
at
org.glassfish.deployment.autodeploy.AutoDeployer.deploy(AutoDeployer.java:573)
at
org.glassfish.deployment.autodeploy.AutoDeployer.deployAll(AutoDeployer.java:459)
at
org.glassfish.deployment.autodeploy.AutoDeployer.run(AutoDeployer.java:391)
at
org.glassfish.deployment.autodeploy.AutoDeployer.run(AutoDeployer.java:376)
at
org.glassfish.deployment.autodeploy.AutoDeployService$1.run(AutoDeployService.java:195)
at java.util.TimerThread.mainLoop(Timer.java:512)
at java.util.TimerThread.run(Timer.java:462)
Exception while loading the app
java.lang.RuntimeException: Unable to load EJB module. DeploymentContext
does not contain any EJB Check archive to ensure correct packaging for
C:\glassfishv3\glassfish\domains\domain1\applications\drools-5.1.1-guvnor
at org.glassfish.ejb.startup.EjbDeployer.load(EjbDeployer.java:133)
at org.glassfish.ejb.startup.EjbDeployer.load(EjbDeployer.java:63)
at org.glassfish.internal.data.ModuleInfo.load(ModuleInfo.java:175)
at
org.glassfish.internal.data.ApplicationInfo.load(ApplicationInfo.java:216)
at
com.sun.enterprise.v3.server.ApplicationLifecycle.deploy(ApplicationLifecycle.java:338)
at
com.sun.enterprise.v3.server.ApplicationLifecycle.deploy(ApplicationLifecycle.java:183)
at
org.glassfish.deployment.admin.DeployCommand.execute(DeployCommand.java:272)
at
com.sun.enterprise.v3.admin.CommandRunnerImpl$1.execute(CommandRunnerImpl.java:310)
at
com.sun.enterprise.v3.admin.CommandRunnerImpl.doCommand(CommandRunnerImpl.java:320)
at
com.sun.enterprise.v3.admin.CommandRunnerImpl.doCommand(CommandRunnerImpl.java:1176)
at
com.sun.enterprise.v3.admin.CommandRunnerImpl.access$900(CommandRunnerImpl.java:83)
at
com.sun.enterprise.v3.admin.CommandRunnerImpl$ExecutionContext.execute(CommandRunnerImpl.java:1235)
at
org.glassfish.deployment.autodeploy.AutoOperation.run(AutoOperation.java:141)
at
org.glassfish.deployment.autodeploy.AutoDeployer.deploy(AutoDeployer.java:573)
at
org.glassfish.deployment.autodeploy.AutoDeployer.deployAll(AutoDeployer.java:459)
at
org.glassfish.deployment.autodeploy.AutoDeployer.run(AutoDeployer.java:391)
at
org.glassfish.deployment.autodeploy.AutoDeployer.run(AutoDeployer.java:376)
at
org.glassfish.deployment.autodeploy.AutoDeployService$1.run(AutoDeployService.java:195)
at java.util.TimerThread.mainLoop(Timer.java:512)
at java.util.TimerThread.run(Timer.java:462)
WARNING: [AutoDeploy] Autodeploy failed :
C:\glassfishv3\glassfish\domains\domain1\autodeploy\drools-5.1.1-guvnor.war.
INFO: [AutoDeploy] Selecting file
C:\glassfishv3\glassfish\domains\domain1\autodeploy\drools-5.1.1-guvnor.war
for autodeployment.
I've already tried the hints I found on Google such as changing the web.xml
to reference 2.5 schema. Didn't work.
Hope someone can help me.
Thanks a lot!
Audrey
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15 years, 7 months
Re: [rules-users] champion challenger
by priyag
Hi,
I have heard about champion challenger concept in many BRMS now a days. Do
we have something like this in DROOLS also ?
Rgds
Priya
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15 years, 7 months
Guvnor with JBoss AS on Ubuntu
by alim
Hello,
I downloaded the Standalone Guvnor with JBoss AS Version 5.1 and tried
running it on Ubuntu 8.04.4 LTS with Java 1.6.0_22.
It seems to start up well, no exceptions/errors. And at the end it even
states that it has started:
15:52:50,957 INFO [Http11Protocol] Starting Coyote HTTP/1.1 on
http-127.0.0.1-9080
15:52:51,054 INFO [AjpProtocol] Starting Coyote AJP/1.3 on
ajp-127.0.0.1-8009
15:52:51,148 INFO [Server] JBoss (MX MicroKernel) [4.2.3.GA (build:
SVNTag=JBoss_4_2_3_GA date=200807181417)] Started in 35s:83ms
However, when I try to go to http://<host>:9080/drools-guvnor remotly I
always get "Connection Failed"!
But when I use "telnet localhost 9080" locally then it says:
"Trying 127.0.0.1...
Connected to localhost."
What am I doing wrong? Any help is much appreciated.
Thanks,
Audrey
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15 years, 7 months
Possible to enforce a unique salience?
by barnabyg
Hi,
Is it possible in Drools to enforce a unique salience?
Ideally this would be done at the point of entering a new rule.
For example, if a rule existed with salience of 17 and a user tried to add a
new rule of salience 17, an error message would be generated saying
'salience level already in use'.
Even better would be the ability to enforce a unique salience for rules
belonging to a particular ruleflow-group.
The reason for wanting to achieve this is to prevent indeterminate behaviour
when two or more rules exist with the same salience level.
Any help would be much appreciated.
Regards,
Barnaby
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15 years, 7 months
