Drools multithreading query
by jayadevan.m＠gmail.com
Hi,
I was trying out some multithreading scenarios for improving the rule
execution time in Drools5. I found two methods for enabling and specifying
the number of threads in RuleBaseConfiguration - setMaxThreads() and
setMultiThreadEvaluation() respectively. But, didn't find multiple threads
being spawned during rule execution. I had set the latter to true and set
the max to 4 before firing the rules using stateless session.
Can someone verify if this is the proper way for implementing
multithreading in Drools? If not, please provide me with links/examples for
implementing this.
Thanks in advance.
Jayadevan
16 years, 7 months
Efficiency of using inline evals in Drools 5
by Nancy Dougherty
Hello!
I have a question about how an inline eval function is or isn’t
efficient in the algorithm- I have many User objects that I am
inserting into Working Memory (in a stateful session), and each User
object has as ArrayList of Messages
The message class has 2 String fields: text and logid
I have custom boolean function user.containsText(String keyword)
function that takes in a string, and searches to see if that keyword
contained in the text field of one of the message entries in the User
message arraylist. If I use an inline eval statement to implement
this:
$user: User( eval (containsText ( “sample text”) ) )
Will it re-evaluate each time? Or will Drools cache the result and
remember it/ create a node based on it so the node will have every
user this is true for, and it doesn’t re-evaluate when the users or
rules are modified? Will it create a "node" in the algorithm for all
the users that this function is true for?
On a similar note, if I use the “matches” comparator in a rule
creation, does it create a node and cache the result? Will it
automatically re-evaluate each time the field its matched against is
modified?
Thanks so much!
Nancy
16 years, 7 months
Re: [rules-users] Using eval in LHS
by Greg Barton
See the attached project. You can run it using maven with this command:
mvn package exec:java -Dexec.mainClass="com.sample.DroolsTest"
There are three basic rules:
MakeCollision: Detect that a collision has happened
MatchCollision: Match vehicles to collisions
IdentifyLargeCollision: Find collisions that are "large"
rule "MakeCollision"
salience 10
when
s : Sighting( collision == null )
not Collision( direction == s.direction, position == s.position, lane == s.lane )
then
Collision c = new Collision( s.direction, s.position, s.lane );
c.getSightings().add( s );
s.setCollision( c );
System.out.println("Creating " + c);
update( s );
insert( c );
end
rule "MatchCollision"
salience 10
when
s : Sighting( collision == null )
c : Collision( direction == s.direction, position == s.position, lane == s.lane )
then
c.getSightings().add( s );
s.setCollision( c );
System.out.println("Matching " + s);
update( s );
update( c );
end
rule "IdentifyLargeCollision"
salience 5
when
num : Number ( intValue > 1 )
from accumulate (
Collision( sightings.size > 2 ),
init( int count = 0; ),
action( count++; ),
reverse( count--; ),
result( count )
);
then
System.out.println("Found " + num);
end
--- On Fri, 7/24/09, nash.8103(a)gmail.com <nash.8103(a)gmail.com> wrote:
> From: nash.8103(a)gmail.com <nash.8103(a)gmail.com>
> Subject: Re: [rules-users] Using eval in LHS
> To: "Rules Users List" <rules-users(a)lists.jboss.org>
> Date: Friday, July 24, 2009, 2:16 PM
> Thanks Greg.....
>
> The reason I chose HashMap is that an accident is said to
> occur if and only if more than 1 vehicle contains four
> consecutive position report as same. So in my hashmap key is
> vehicle id and value is the no. Of times same position
> report received... Can you suggest me a way to
> 1. Collect all vehicles stopped at some point and the
> occurance of that event is reported more than thrice
> 2. Report accident if there are more than one vehicle found
> in step 1
>
> ---Priya
> -original message-
> Subject: Re: [rules-users] Using eval in LHS
> From: Greg Barton <greg_barton(a)yahoo.com>
> Date: 24/07/2009 10:36 pm
>
>
> Try this:
>
> rule "Create Collision Location"
> salience 90
> no-loop true
> when
> vehLoc : VehicleLocation()
> not CollisionLocation(xway == vehLoc.xway,
> pos ==
> vehLoc.pos, dir == vehLoc.dir, lane == vehLoc.lane)
> then
> CollisionLocation collisionLoc = new
> CollisionLocation(vehLoc.getXway(),
> vehLoc.getPos(), vehLoc.getDir(), vehLoc.getLane());
> insert(collisionLoc);
> end
>
> rule "Collect Collided Vehicles"
> salience 90
> no-loop true
> when
> vehLoc : VehicleLocation()
> $collisionLoc : CollisionLocation(xway ==
> vehLoc.xway, pos ==
> vehLoc.pos, dir == vehLoc.dir, lane == vehLoc.lane)
> then
>
> collisionLoc.getVehicleLocations().add(vehLoc);
> update(collisionLoc);
> end
>
> And now, the rule that detects more than three coinciding
> vehicle locations is simple:
>
> rule "Detect Too Many"
> when
> CollisionLocation(vehicleLocations.size >
> 2)
> then
> ...foo...
> end
>
> And, if you want to make the execution a bit more
> efficient, put a reference in VehicleLocation to it's
> associated CollisionLocation. That way you can have
> "vehLoc : VehicleLocation(collisionLocation == null)" to
> reduce partial matches.
>
> --- On Fri, 7/24/09, PriyaSha <nash.8103(a)gmail.com>
> wrote:
>
> > From: PriyaSha <nash.8103(a)gmail.com>
> > Subject: [rules-users] Using eval in LHS
> > To: rules-users(a)lists.jboss.org
> > Date: Friday, July 24, 2009, 10:45 AM
> >
> > Input:
> > 0,0,107,32,0,0,0,10,53320,-1,-1,-1,-1,-1,-1
> > 0,0,107,32,0,0,0,10,53320,-1,-1,-1,-1,-1,-1
> > 0,0,107,32,0,0,0,10,53320,-1,-1,-1,-1,-1,-1
> > 0,0,107,32,0,0,0,10,53320,-1,-1,-1,-1,-1,-1
> > 0,0,109,20,0,0,0,19,100644,-1,-1,-1,-1,-1,-1
> > 0,0,109,20,0,0,0,19,100644,-1,-1,-1,-1,-1,-1
> > 0,0,106,28,0,0,0,26,137745,-1,-1,-1,-1,-1,-1
> > 0,0,108,32,0,0,0,67,354281,-1,-1,-1,-1,-1,-1
> > 0,0,105,30,0,0,1,94,501089,-1,-1,-1,-1,-1,-1
> >
> > Problem:
> >
> > Should find vehicles with same data (if it occurs more
> than
> > thrice).
> >
> > Though eval in rule 'Detect Accident' results in
> true,
> > consequence is not
> > fired.
> >
> > Output:
> >
> > Added
> > Not Found -- 107---2
> > test---2----107
> > Not Found -- 107---3
> > test---3----107
> > Not Found -- 107---4
> > test---4----107
> > no of veh : 1
> > no of veh : 1
> > no of veh : 1
> > Not Found -- 109---5
> > test---1----109
> > Not Found -- 109---6
> > test---2----109
> > Not Found -- 106---7
> >
> > Please find the DRL below.
> >
> >
> > package com.hp.hpl.CHAOS.LR;
> >
> > # importing classes
> > import java.lang.Integer;
> >
> > import java.util.ArrayList;
> > import java.util.HashMap;
> > import java.util.Iterator;
> >
> > import com.hp.hpl.CHAOS.Rules.VehicleLocation;
> >
> > global java.lang.String output
> >
> > declare VehicleLocation
> > @role ( event )
> > @expires ( 1m )
> > end
> >
> > declare Statistics
> > smashedcars : ArrayList
> > stopped_cars : ArrayList
> > accidents :
> ArrayList
> > collided_at : HashMap
> > end
> >
> > rule "Setup statistics"
> > salience 110
> > no-loop true
> > when
> > not( Statistics( ) )
> > vehLoc : VehicleLocation()
> > then
> > Statistics s = new Statistics();
> > s.setSmashedcars (new ArrayList());
> > s.setStopped_cars (new ArrayList());
> > s.getStopped_cars().add(vehLoc);
> > s.setCollided_at(new HashMap());
> > insert( s );
> >
> > System.out.println("Added");
> > end
> >
> > rule "Add to stopped cars"
> > salience 100
> > no-loop true
> > when
> > vehLoc : VehicleLocation()
> > $stat : Statistics ()
> > ((not( VehicleLocation(vid ==
> > vehLoc.vid) from $stat.getSmashedcars())))
> > then
> > modify($stat) {
> >
> > getStopped_cars().add(vehLoc);
> > }
> > System.out.println("Not Found
> -- " +
> > vehLoc.getVid() + "---" +
> > $stat.getStopped_cars().size());
> > end
> >
> >
> > rule "Identify Collided Vehicles"
> > salience 90
> > no-loop true
> > when
> > vehLoc : VehicleLocation()
> > $stat : Statistics ()
> > $allStoppedcars : ArrayList(
> size > 0
> > )
> > from
> > collect ( VehicleLocation(xway == vehLoc.xway, pos ==
> > vehLoc.pos, dir == vehLoc.dir, lane == vehLoc.lane)
> from
> > $stat.stopped_cars)
> > then
> > System.out.println("test" +
> "---" +
> > $allStoppedcars.size() + "----" +
> > vehLoc.getVid());
> >
> > modify($stat) {
> >
> > setCollided_at(collided_at($allStoppedcars,
> > vehLoc.getXway(),
> > vehLoc.getPos(), vehLoc.getDir(), vehLoc.getLane()));
> > }
> > retract (vehLoc);
> > end
> >
> > rule "Detect Accident"
> > salience 80
> > no-loop true
> > when
> > vehLoc : VehicleLocation()
> > $stat : Statistics ()
> >
> > eval(collision_occured($stat.getCollided_at()))
> > then
> > System.out.println("Detect
> Accident");
> > end
> >
> > function HashMap collided_at(ArrayList stopped_cars,
> int x,
> > int pos, int
> > dir, int lane) {
> > HashMap collided_at = new
> HashMap();
> > for (Iterator iterator =
> > stopped_cars.iterator(); iterator.hasNext(); )
> > {
> > VehicleLocation
> vehLoc =
> > (VehicleLocation) iterator.next();
> > if
> (vehLoc.getXway() == x
> >
> &&
> > vehLoc.getPos() == pos
> >
> &&
> > vehLoc.getDir() == dir
> >
> &&
> > vehLoc.getLane() == lane) {
> >
> >
> int key =
> > vehLoc.getVid();
> >
> if
> > (!collided_at.containsKey(key)) {
> >
>
> > collided_at.put (key, new Integer(1));
> >
>
> > continue;
> > }
> >
> collided_at.put
> > (key,
> > ((Integer)collided_at.get(key)).intValue()+1);
> > }
> > }
> > return collided_at;
> > }
> >
> > function boolean collision_occured(HashMap
> > collided_vehicles) {
> > java.util.Set entries =
> > collided_vehicles.entrySet();
> > int noOfCollidedVehicles = 0;
> > java.util.Iterator iterator =
> > entries.iterator();
> >
> > while ( iterator.hasNext() )
> {
> >
> java.util.Map.Entry object =
> > (java.util.Map.Entry) iterator.next();
> > if
> ((Integer)object.getValue()
> > > 3) {
> >
> > noOfCollidedVehicles += 1;
> > }
> > }
> >
> > if (noOfCollidedVehicles >
> 0) {
> >
> System.out.println("no of veh :
> > " + noOfCollidedVehicles);
> > return true;
> > }
> > return false;
> > }
> >
> > Please let me know what should I correct here.
> > --
> > View this message in context: http://www.nabble.com/Using-eval-in-LHS-tp24646946p24646946.html
> > Sent from the drools - user mailing list archive at
> > Nabble.com.
> >
> > _______________________________________________
> > rules-users mailing list
> > rules-users(a)lists.jboss.org
> > https://lists.jboss.org/mailman/listinfo/rules-users
> >
>
>
>
>
> _______________________________________________
> rules-users mailing list
> rules-users(a)lists.jboss.org
> https://lists.jboss.org/mailman/listinfo/rules-users
>
>
> _______________________________________________
> rules-users mailing list
> rules-users(a)lists.jboss.org
> https://lists.jboss.org/mailman/listinfo/rules-users
>
16 years, 7 months
Integrating Drools5.0 into J2EE APP
by Sumant Kumar
Hi,
Can somebody describe in a high level how the Drools components ( Guvnor,Expert, etc) are integrated into J2EE app.
I am looking for these items as part of Drools deployment configuration
1) How are rules saved ( File system or DB )
2) How is rule versioning enabled ( with Subversion )
3) Rules and RuleSet granularity . How many rules should go in one DRL.
4) Facts: Are facts defined as POJOs and uploaded to Drools or Declarative FACTs are defined in Drools Guvnor
Any links over the web will be great too.
thanks
Sam
16 years, 7 months
Re: [rules-users] Run Drool Application From Command Prompt
by Pankaj.Jain＠lntinfotech.com
Hi
I still have not got any solution of my problem that I posted previously.
I have included all required jar files and set proper class path .. Please
do help ?
problem:
I am trying to integrate Drool with ofbiz and run application from command
prompt. In one way I have integrated it properly and I am able to run it
successfully.
Code : Which I was using initially
KnowledgeBuilder kbuilder = KnowledgeBuilderFactory.newKnowledgeBuilder();
or
PackageBuilderConfiguration cfg = new PackageBuilderConfiguration();
KnowledgeBuilder kbuilder = KnowledgeBuilderFactory.newKnowledgeBuilder();
Exception I got :
org.drools.RuntimeDroolsException: Unable to load dialect
'org.drools.rule.builder.dialect.java.JavaDialectConfiguration:java
:org.drools.rule.builder.dialect.java.JavaDialectConfiguration'
at
org.drools.compiler.PackageBuilderConfiguration.addDialect(PackageBuilderConfiguration.java:274)
at
org.drools.compiler.PackageBuilderConfiguration.buildDialectConfigurationMap(PackageBuilderConfiguration.java:259)
at
org.drools.compiler.PackageBuilderConfiguration.init(PackageBuilderConfiguration.java:176)
at
org.drools.compiler.PackageBuilderConfiguration.<init>(PackageBuilderConfiguration.java:153)
at org.drools.compiler.PackageBuilder.<init>(PackageBuilder.java:242)
.
.
.
Caused by: java.lang.NullPointerException
at
org.drools.rule.builder.dialect.java.JavaDialectConfiguration.setCompiler(JavaDialectConfiguration.java:92)
at
org.drools.rule.builder.dialect.java.JavaDialectConfiguration.init(JavaDialectConfiguration.java:55)
at
org.drools.compiler.PackageBuilderConfiguration.addDialect(PackageBuilderConfiguration.java:270
Problem I found :
In the class JavaDialectConfiguration in jar file drools-compiler.jar
there is a method named "setCompliler", in this method Null Pointer
Exception was coming.
Solution I provided :
In my application I created my custom class CustomJavaDialectConfiguration
by extending to class JavaDialectConfiguration, In this class I overrided
the method setCompiler. My method was exactly same as that of method
setCompiler in JavaDialectConfiguration . To call my dialect class I also
overrided the method "addDialect" of PackageBuilderConfiguration class .
For that I created class CustomPackageBuilderConfiguration by extending to
PackageBuilderConfiguration.
after that I wrote the code:
PackageBuilderConfiguration cfg = new CustomPackageBuilderConfiguration();
KnowledgeBuilder kbuilder =
KnowledgeBuilderFactory.newKnowledgeBuilder(cfg);
Now application is running perfectly fine from both eclipse and command
prompt without any exception.
I want to know as my overrided method "setCompiler" was exactly same then
why I had to override method, and In original code (ie in
drools-compiler.jar file) why it was giving exception ??? Was that due
to class lader or something else ?? Please do help in this regard ....
Thanks & Regards:
Pankaj Jain | L&T infotech |Navi Mumbai
Mobile: +91 9920218945
Email : pankaj.jain(a)lntinfotech.com
www.Lntinfotech.com
"Whatever the mind of man can conceive & believe, it can achieve."
Larsen & Toubro Infotech Ltd.
www.Lntinfotech.com
This Document is classified as:
L&T Infotech Proprietary L&T Infotech Confidential L&T Infotech
Internal Use Only L&T Infotech General Business
This Email may contain confidential or privileged information for the
intended recipient (s) If you are not the intended recipient, please do
not use or disseminate the information, notify the sender and delete it
from your system.
______________________________________________________________________
16 years, 7 months
Re: [rules-users] Run Drool Application From Command Prompt
by Greg Barton
Well, there you go. :) Just put drools into the regular classpath and not the bootstrap classpath. Is that possible?
--- On Tue, 7/28/09, Pankaj.Jain(a)lntinfotech.com <Pankaj.Jain(a)lntinfotech.com> wrote:
> From: Pankaj.Jain(a)lntinfotech.com <Pankaj.Jain(a)lntinfotech.com>
> Subject: Re: [rules-users] Run Drool Application From Command Prompt
> To: "Rules Users List" <rules-users(a)lists.jboss.org>
> Date: Tuesday, July 28, 2009, 1:23 AM
>
>
> Hi
>
>
>
> you r right, When I run
> the application
> (integrated with OFBiz) from command prompt I get the
> NPE: in line
>
>
>
> getClass().getClassLoader().loadClass(
> "org.eclipse.jdt.internal.compiler.Compiler"
> );
>
>
>
> When I run the
> application (ofcourse
> integrated with OFBiz) from eclipse I don't get
> NPE exception.
>
>
>
>
>
> In ofbiz we have a batch
> file named
> startofbiz.bat to run the application, inside this I
> configured the classpath
> by this
>
>
>
>
>
> set
> VMARGS=-Xbootclasspath/p:applications\order\lib\antlr-runtime.jar
>
> set
> VMARGS=-Xbootclasspath/p:applications\order\lib\drools-api.jar
> %VMARGS%
>
> set
> VMARGS=-Xbootclasspath/p:applications\order\lib\drools-compiler.jar
> %VMARGS%
>
> set
> VMARGS=-Xbootclasspath/p:applications\order\lib\drools-core.jar
> %VMARGS%
>
> set
> VMARGS=-Xbootclasspath/p:applications\order\lib\drools-decisiontables.jar
> %VMARGS%
>
> set
> VMARGS=-Xbootclasspath/p:applications\order\lib\drools-jsr94.jar
> %VMARGS%
>
> set
> VMARGS=-Xbootclasspath/p:applications\order\lib\drools-templates.jar
> %VMARGS%
>
> set
> VMARGS=-Xbootclasspath/p:applications\order\lib\joda-time.jar
> %VMARGS%
>
> set
> VMARGS=-Xbootclasspath/p:applications\order\lib\jsr94.jar
> %VMARGS%
>
> set
> VMARGS=-Xbootclasspath/p:applications\order\lib\jxl.jar
> %VMARGS%
>
> set
> VMARGS=-Xbootclasspath/p:applications\order\lib\mvel2.jar
> %VMARGS%
>
> set
> VMARGS=-Xbootclasspath/p:applications\order\lib\org.eclipse.jdt.core_3.4.4.v_894_R34x.jar
> %VMARGS%
>
> set
> VMARGS=-Xbootclasspath/p:applications\order\lib\xpp3.jar
> %VMARGS%
>
> set
> VMARGS=-Xbootclasspath/p:applications\order\lib\xpp3_min.jar
> %VMARGS%
>
> set
> VMARGS=-Xbootclasspath/p:applications\order\lib\xstream.jar
> %VMARGS%
>
>
>
>
>
>
>
> If i don't do this I
> get the class
> not found exception
>
>
>
> Thanks & Regards:
>
>
>
> Pankaj Jain | L&T infotech |Navi Mumbai
>
> Mobile: +91 9920218945
>
> Email : pankaj.jain(a)lntinfotech.com
>
> www.Lntinfotech.com
>
>
>
> "Whatever the mind of man can conceive & believe,
> it can achieve."
>
>
>
> Larsen & Toubro Infotech Ltd.
>
> www.Lntinfotech.com
>
>
>
> This Document is classified as:
>
>
>
> L&T
> Infotech Proprietary L&T
> Infotech Confidential L&T
> Infotech Internal Use Only L&T
> Infotech General Business
>
>
>
> This Email may contain confidential or privileged
> information for the intended
> recipient (s) If you are not the intended recipient, please
> do not use
> or disseminate the information, notify the sender and
> delete it from your
> system.
>
>
>
>
>
>
>
>
> Greg
> Barton <greg_barton(a)yahoo.com>
>
>
> Sent by:
> rules-users-bounces(a)lists.jboss.org
> 07/28/2009 11:29
> AM
>
>
>
> Please respond to
>
> Rules Users List
> <rules-users(a)lists.jboss.org>
>
>
>
>
>
>
> To
> Rules Users List
> <rules-users(a)lists.jboss.org>
>
>
> cc
>
>
>
> Subject
> Re: [rules-users]
> Run Drool Application
> >From Command Prompt
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
> It's unclear from your post when you get the NPE: from
> the command line,
> from eclipse, or when integrated with OFBiz. (I assume
> you're referring
> to http://ofbiz.apache.org/)
>
>
>
> It's undoubtedly a classpath issue. Just peek at
> the source a bit.
> I'm not sure what version you're using, but
> if you look at the source
> in the svn repo you'll see that line 92 of
> JavaDialectConfiguration is
> this:
>
>
>
> getClass().getClassLoader().loadClass(
> "org.eclipse.jdt.internal.compiler.Compiler"
> );
>
>
>
> See the javadoc for Class.getClassLoader() that says
> "Returns the
> class loader for the class. Some implementations may use
> null to represent
> the bootstrap class loader. This method will return null in
> such implementations
> if this class was loaded by the bootstrap class
> loader."
>
>
>
> So, it looks probable that in the environment that's
> having problems, the
> JavaDialectConfiguration class is loaded by the bootstrap
> classloader.
> What is the VM implementation you're using?
>
>
>
> It might be best if
> Thread.currentThread().getContextClassLoader() was
> used instead of getClass().getClassLoader() in
> JavaDialectConfiguration
> and elsewhere. Devs, have an opinion on that?
>
>
>
> --- On Mon, 7/27/09, Pankaj.Jain(a)lntinfotech.com
> <Pankaj.Jain(a)lntinfotech.com>
> wrote:
>
>
>
> > From: Pankaj.Jain(a)lntinfotech.com
> <Pankaj.Jain(a)lntinfotech.com>
>
> > Subject: Re: [rules-users] Run Drool Application From
> Command Prompt
>
> > To: rules-users(a)lists.jboss.org
>
> > Date: Monday, July 27, 2009, 11:50 PM
>
> >
>
> >
>
> > Hi
>
> >
>
> >
>
> >
>
> > I still have not got any
>
> > solution
>
> > of my problem that I posted previously. I have
> included all
>
> > required jar
>
> > files and set proper class path .. Please do help ?
>
> >
>
> >
>
> >
>
> > problem:
>
> >
>
> >
>
> >
>
> >
>
> > I am trying to
>
> > integrate Drool with
>
> > ofbiz and run application from command prompt. In one
> way I
>
> > have integrated
>
> > it properly and I am able to run it
>
> > successfully.
>
> >
>
> >
>
> >
>
> >
>
> > Code : Which I was using initially
>
> >
>
> >
>
> >
>
> > KnowledgeBuilder kbuilder =
>
> > KnowledgeBuilderFactory.newKnowledgeBuilder();
>
> >
>
> >
>
> >
>
> >
>
> > or
>
> >
>
> >
>
> >
>
> > PackageBuilderConfiguration cfg = new
>
> > PackageBuilderConfiguration();
>
> >
>
> >
>
> > KnowledgeBuilder kbuilder =
>
> > KnowledgeBuilderFactory.newKnowledgeBuilder();
>
> >
>
> >
>
> >
>
> >
>
> > Exception I got :
>
> >
>
> >
>
> >
>
> > org.drools.RuntimeDroolsException: Unable to load
> dialect
>
> >
> 'org.drools.rule.builder.dialect.java.JavaDialectConfiguration:java
>
> >
>
> >
>
> >
> :org.drools.rule.builder.dialect.java.JavaDialectConfiguration'
>
> >
>
> >
>
> > at
>
> >
> org.drools.compiler.PackageBuilderConfiguration.addDialect(PackageBuilderConfiguration.java:274)
>
> > at
>
> >
> org.drools.compiler.PackageBuilderConfiguration.buildDialectConfigurationMap(PackageBuilderConfiguration.java:259)
>
> >
>
> >
>
> >
>
> >
>
> > at
>
> >
> org.drools.compiler.PackageBuilderConfiguration.init(PackageBuilderConfiguration.java:176)
>
> > at
>
> >
> org.drools.compiler.PackageBuilderConfiguration.<init>(PackageBuilderConfiguration.java:153)
>
> > at
>
> >
> org.drools.compiler.PackageBuilder.<init>(PackageBuilder.java:242)
>
> >
>
> >
>
> > .
>
> >
>
> > .
>
> >
>
> > .
>
> >
>
> > Caused by: java.lang.NullPointerException
>
> >
>
> > at
>
> >
> org.drools.rule.builder.dialect.java.JavaDialectConfiguration.setCompiler(JavaDialectConfiguration.java:92)
>
> > at
>
> >
> org.drools.rule.builder.dialect.java.JavaDialectConfiguration.init(JavaDialectConfiguration.java:55)
>
> > at
>
> >
> org.drools.compiler.PackageBuilderConfiguration.addDialect(PackageBuilderConfiguration.java:270
>
> >
>
> >
>
> >
>
> >
>
> > Problem I found :
>
> >
>
> > In the class JavaDialectConfiguration in jar file
>
> > drools-compiler.jar there
>
> > is a method named "setCompliler", in
> this
>
> > method Null Pointer
>
> > Exception was coming.
>
> >
>
> >
>
> >
>
> > Solution I provided :
>
> >
>
> >
>
> > In my application I created my custom class
>
> > CustomJavaDialectConfiguration
>
> > by extending to class JavaDialectConfiguration, In
> this
>
> > class I overrided
>
> > the method setCompiler. My method was exactly same as
> that
>
> > of method setCompiler
>
> > in JavaDialectConfiguration . To call my dialect class
> I
>
> > also overrided
>
> > the method "addDialect" of
>
> > PackageBuilderConfiguration class
>
> > . For that I created class
>
> > CustomPackageBuilderConfiguration by extending
>
> > to PackageBuilderConfiguration.
>
> >
>
> > after that I wrote the code:
>
> >
>
> >
>
> >
>
> > PackageBuilderConfiguration cfg = new
>
> > CustomPackageBuilderConfiguration();
>
> >
>
> >
>
> > KnowledgeBuilder kbuilder =
>
> > KnowledgeBuilderFactory.newKnowledgeBuilder(cfg);
>
> >
>
> >
>
> >
>
> >
>
> >
>
> >
>
> > Now application is running perfectly fine from both
> eclipse
>
> > and command
>
> > prompt without any exception.
>
> >
>
> >
>
> >
>
> > I want to know as my overrided method
>
> > "setCompiler" was exactly
>
> > same then why I had to override method, and In
> original
>
> > code (ie in drools-compiler.jar
>
> > file) why it was giving exception ??? Was
> that
>
> > due to class
>
> > lader or something else ?? Please do help in
> this
>
> > regard ....
>
> >
>
> >
>
> >
>
> >
>
> >
>
> >
>
> >
>
> >
>
> > Thanks & Regards:
>
> >
>
> >
>
> >
>
> > Pankaj Jain | L&T infotech |Navi Mumbai
>
> >
>
> > Mobile: +91 9920218945
>
> >
>
> > Email : pankaj.jain(a)lntinfotech.com
>
> >
>
> > www.Lntinfotech.com
>
> >
>
> >
>
> >
>
> > "Whatever the mind of man can conceive &
> believe,
>
> > it can achieve."
>
> >
>
> >
>
> >
>
> > Larsen & Toubro Infotech Ltd.
>
> >
>
> > www.Lntinfotech.com
>
> >
>
> >
>
> >
>
> > This Document is classified as:
>
> >
>
> >
>
> >
>
> > L&T
>
> > Infotech Proprietary L&T
>
> > Infotech Confidential L&T
>
> > Infotech Internal Use Only L&T
>
> > Infotech General Business
>
> >
>
> >
>
> >
>
> > This Email may contain confidential or privileged
>
> > information for the intended
>
> > recipient (s) If you are not the intended recipient,
> please
>
> > do not use
>
> > or disseminate the information, notify the sender and
>
> > delete it from your
>
> > system.
>
> >
>
> >
>
> >
>
> >
> ______________________________________________________________________
>
> >
>
> >
>
> > -----Inline Attachment Follows-----
>
> >
>
> > _______________________________________________
>
> > rules-users mailing list
>
> > rules-users(a)lists.jboss.org
>
> > https://lists.jboss.org/mailman/listinfo/rules-users
>
> >
>
>
>
>
>
>
>
>
>
> _______________________________________________
>
> rules-users mailing list
>
> rules-users(a)lists.jboss.org
>
> https://lists.jboss.org/mailman/listinfo/rules-users
>
>
>
> ______________________________________________________________________
>
>
>
>
>
>
>
> ______________________________________________________________________
>
>
> -----Inline Attachment Follows-----
>
> _______________________________________________
> rules-users mailing list
> rules-users(a)lists.jboss.org
> https://lists.jboss.org/mailman/listinfo/rules-users
>
16 years, 7 months
NPE exception in MarshallerReaderContext
by NKeating＠decaresystems.ie
Hi,
I'm getting a NPE exception when using drools-persistence-jpa with Drools Flow
(I'm working with the trunk version 28274). It occurs in
MarshallerReaderContext (line 78, see link below) and seems to be a result of
JBRULES-2149. When loading a WorkItemInfo from the database a
MarshallerReaderContext is created without the ruleBase set. For the moment I
have added another catch block for the NPE and call super.resolveClass(desc).
This seems to be working correctly and would have been the behaviour before
JBRULES-2149.
Should I go ahead and create a JIRA issue for this, or what is the prefered way
to get the fixed in the trunk?
http://fisheye.jboss.org/browse/JBossRules/trunk/drools-core/src/main/jav...
http://fisheye.jboss.org/browse/JBossRules/trunk/drools-persistence-jpa/s...
https://jira.jboss.org/jira/browse/JBRULES-2149
Regards,
Noel Keating
Senior Developer
DeCare Systems Ireland
+353 21 492-5188
nkeating(a)decaresystems.ie
blog.decaresystems.ie
This e-mail and any files transmitted with it are intended solely for the individual or entity to whom they are addressed.
This communication may contain material that is privileged, confidential and protected from disclosure under the law.
If you are not the intended recipient, any disclosure, distribution, copying, or use of this information is strictly prohibited and may be unlawful.
If you have received this e-mail in error, please reply immediately to the sender and delete it.
Registered Address:
DeCare Systems Ireland Ltd,
Building 1,
University Technology Centre,
Curraheen Road,
Cork,
Ireland.
Company Registration Number: 278462
16 years, 7 months
guvnor analysis question/error and scenarios
by phil went
Am running drools 5.0.1 ga using the drools/jboss standalone package.
When I run the analysis from within guvnor, no error comes up in guvnor and
it happily lists the models and attribs, but the following comes up in the
server output:
>>
15:06:15,122 ERROR [STDERR] org.drools.RuntimeDroolsException:
org.drools.verifier.opposites.Rule_Opposite_LiteralRestrictions_0Eval1Invoker@90c73ecd:
java.util.zip.DataFormatException: Value types did not match. Value
type
boolean was compared to boolean
15:06:15,123 ERROR [STDERR] at
org.drools.rule.EvalCondition.isAllowed(EvalCondition.java:122)
15:06:15,123 ERROR [STDERR]
>>
The rules all fire as expected, the scenarios all execute, and the rules
file (in guvnor) all validates OK.
Am a complete java noob, so do not know if it is just something obvious I
have missed about boolean defintions?
Also, when the "run all scenarios" is run from within guvnor, scenarios are
not updated in the same way as when the scenario is run individually. eg I
ran the tests individually when setting up, and subsequently only ran all
scenarios in batch. Only found out when I ran an xlst on the scenarios to
show off how cool this stuff is to the managers, showing last run and last
results.
Phil
16 years, 7 months
Re: [rules-users] Run Drool Application From Command Prompt
by Greg Barton
It's unclear from your post when you get the NPE: from the command line, from eclipse, or when integrated with OFBiz. (I assume you're referring to http://ofbiz.apache.org/)
It's undoubtedly a classpath issue. Just peek at the source a bit. I'm not sure what version you're using, but if you look at the source in the svn repo you'll see that line 92 of JavaDialectConfiguration is this:
getClass().getClassLoader().loadClass( "org.eclipse.jdt.internal.compiler.Compiler" );
See the javadoc for Class.getClassLoader() that says "Returns the class loader for the class. Some implementations may use null to represent the bootstrap class loader. This method will return null in such implementations if this class was loaded by the bootstrap class loader."
So, it looks probable that in the environment that's having problems, the JavaDialectConfiguration class is loaded by the bootstrap classloader. What is the VM implementation you're using?
It might be best if Thread.currentThread().getContextClassLoader() was used instead of getClass().getClassLoader() in JavaDialectConfiguration and elsewhere. Devs, have an opinion on that?
--- On Mon, 7/27/09, Pankaj.Jain(a)lntinfotech.com <Pankaj.Jain(a)lntinfotech.com> wrote:
> From: Pankaj.Jain(a)lntinfotech.com <Pankaj.Jain(a)lntinfotech.com>
> Subject: Re: [rules-users] Run Drool Application From Command Prompt
> To: rules-users(a)lists.jboss.org
> Date: Monday, July 27, 2009, 11:50 PM
>
>
> Hi
>
>
>
> I still have not got any
> solution
> of my problem that I posted previously. I have included all
> required jar
> files and set proper class path .. Please do help ?
>
>
>
> problem:
>
>
>
>
> I am trying to
> integrate Drool with
> ofbiz and run application from command prompt. In one way I
> have integrated
> it properly and I am able to run it
> successfully.
>
>
>
>
> Code : Which I was using initially
>
>
>
> KnowledgeBuilder kbuilder =
> KnowledgeBuilderFactory.newKnowledgeBuilder();
>
>
>
>
> or
>
>
>
> PackageBuilderConfiguration cfg = new
> PackageBuilderConfiguration();
>
>
> KnowledgeBuilder kbuilder =
> KnowledgeBuilderFactory.newKnowledgeBuilder();
>
>
>
>
> Exception I got :
>
>
>
> org.drools.RuntimeDroolsException: Unable to load dialect
> 'org.drools.rule.builder.dialect.java.JavaDialectConfiguration:java
>
>
> :org.drools.rule.builder.dialect.java.JavaDialectConfiguration'
>
>
> at
> org.drools.compiler.PackageBuilderConfiguration.addDialect(PackageBuilderConfiguration.java:274)
> at
> org.drools.compiler.PackageBuilderConfiguration.buildDialectConfigurationMap(PackageBuilderConfiguration.java:259)
>
>
>
>
> at
> org.drools.compiler.PackageBuilderConfiguration.init(PackageBuilderConfiguration.java:176)
> at
> org.drools.compiler.PackageBuilderConfiguration.<init>(PackageBuilderConfiguration.java:153)
> at
> org.drools.compiler.PackageBuilder.<init>(PackageBuilder.java:242)
>
>
> .
>
> .
>
> .
>
> Caused by: java.lang.NullPointerException
>
> at
> org.drools.rule.builder.dialect.java.JavaDialectConfiguration.setCompiler(JavaDialectConfiguration.java:92)
> at
> org.drools.rule.builder.dialect.java.JavaDialectConfiguration.init(JavaDialectConfiguration.java:55)
> at
> org.drools.compiler.PackageBuilderConfiguration.addDialect(PackageBuilderConfiguration.java:270
>
>
>
>
> Problem I found :
>
> In the class JavaDialectConfiguration in jar file
> drools-compiler.jar there
> is a method named "setCompliler", in this
> method Null Pointer
> Exception was coming.
>
>
>
> Solution I provided :
>
>
> In my application I created my custom class
> CustomJavaDialectConfiguration
> by extending to class JavaDialectConfiguration, In this
> class I overrided
> the method setCompiler. My method was exactly same as that
> of method setCompiler
> in JavaDialectConfiguration . To call my dialect class I
> also overrided
> the method "addDialect" of
> PackageBuilderConfiguration class
> . For that I created class
> CustomPackageBuilderConfiguration by extending
> to PackageBuilderConfiguration.
>
> after that I wrote the code:
>
>
>
> PackageBuilderConfiguration cfg = new
> CustomPackageBuilderConfiguration();
>
>
> KnowledgeBuilder kbuilder =
> KnowledgeBuilderFactory.newKnowledgeBuilder(cfg);
>
>
>
>
>
>
> Now application is running perfectly fine from both eclipse
> and command
> prompt without any exception.
>
>
>
> I want to know as my overrided method
> "setCompiler" was exactly
> same then why I had to override method, and In original
> code (ie in drools-compiler.jar
> file) why it was giving exception ??? Was that
> due to class
> lader or something else ?? Please do help in this
> regard ....
>
>
>
>
>
>
>
>
> Thanks & Regards:
>
>
>
> Pankaj Jain | L&T infotech |Navi Mumbai
>
> Mobile: +91 9920218945
>
> Email : pankaj.jain(a)lntinfotech.com
>
> www.Lntinfotech.com
>
>
>
> "Whatever the mind of man can conceive & believe,
> it can achieve."
>
>
>
> Larsen & Toubro Infotech Ltd.
>
> www.Lntinfotech.com
>
>
>
> This Document is classified as:
>
>
>
> L&T
> Infotech Proprietary L&T
> Infotech Confidential L&T
> Infotech Internal Use Only L&T
> Infotech General Business
>
>
>
> This Email may contain confidential or privileged
> information for the intended
> recipient (s) If you are not the intended recipient, please
> do not use
> or disseminate the information, notify the sender and
> delete it from your
> system.
>
>
>
> ______________________________________________________________________
>
>
> -----Inline Attachment Follows-----
>
> _______________________________________________
> rules-users mailing list
> rules-users(a)lists.jboss.org
> https://lists.jboss.org/mailman/listinfo/rules-users
>
16 years, 7 months
Re: [rules-users] Run Drool Application From Command Prompt
by Greg Barton
heh. I just remembered that Thread.currentThread().getContextClassLoader() can return null as well. :) A good thing to do is have a utility function like the attached class loading utility class. Rearrange the class loading order to suit your taste.
--- On Tue, 7/28/09, Greg Barton <greg_barton(a)yahoo.com> wrote:
> From: Greg Barton <greg_barton(a)yahoo.com>
> Subject: Re: [rules-users] Run Drool Application From Command Prompt
> To: "Rules Users List" <rules-users(a)lists.jboss.org>
> Date: Tuesday, July 28, 2009, 12:59 AM
>
> It's unclear from your post when you get the NPE: from the
> command line, from eclipse, or when integrated with OFBiz.
> (I assume you're referring to http://ofbiz.apache.org/)
>
> It's undoubtedly a classpath issue. Just peek at the
> source a bit. I'm not sure what version you're using,
> but if you look at the source in the svn repo you'll see
> that line 92 of JavaDialectConfiguration is this:
>
> getClass().getClassLoader().loadClass(
> "org.eclipse.jdt.internal.compiler.Compiler" );
>
> See the javadoc for Class.getClassLoader() that says
> "Returns the class loader for the class. Some
> implementations may use null to represent the bootstrap
> class loader. This method will return null in such
> implementations if this class was loaded by the bootstrap
> class loader."
>
> So, it looks probable that in the environment that's having
> problems, the JavaDialectConfiguration class is loaded by
> the bootstrap classloader. What is the VM
> implementation you're using?
>
> It might be best if
> Thread.currentThread().getContextClassLoader() was used
> instead of getClass().getClassLoader() in
> JavaDialectConfiguration and elsewhere. Devs, have an
> opinion on that?
>
> --- On Mon, 7/27/09, Pankaj.Jain(a)lntinfotech.com
> <Pankaj.Jain(a)lntinfotech.com>
> wrote:
>
> > From: Pankaj.Jain(a)lntinfotech.com
> <Pankaj.Jain(a)lntinfotech.com>
> > Subject: Re: [rules-users] Run Drool Application From
> Command Prompt
> > To: rules-users(a)lists.jboss.org
> > Date: Monday, July 27, 2009, 11:50 PM
> >
> >
> > Hi
> >
> >
> >
> > I still have not got any
> > solution
> > of my problem that I posted previously. I have
> included all
> > required jar
> > files and set proper class path .. Please do help ?
> >
> >
> >
> > problem:
> >
> >
> >
> >
> > I am trying to
> > integrate Drool with
> > ofbiz and run application from command prompt. In one
> way I
> > have integrated
> > it properly and I am able to run it
> > successfully.
> >
> >
> >
> >
> > Code : Which I was using initially
> >
> >
> >
> > KnowledgeBuilder kbuilder =
> > KnowledgeBuilderFactory.newKnowledgeBuilder();
> >
> >
> >
> >
> > or
> >
> >
> >
> > PackageBuilderConfiguration cfg = new
> > PackageBuilderConfiguration();
> >
> >
> > KnowledgeBuilder kbuilder =
> > KnowledgeBuilderFactory.newKnowledgeBuilder();
> >
> >
> >
> >
> > Exception I got :
> >
> >
> >
> > org.drools.RuntimeDroolsException: Unable to load
> dialect
> >
> 'org.drools.rule.builder.dialect.java.JavaDialectConfiguration:java
> >
> >
> >
> :org.drools.rule.builder.dialect.java.JavaDialectConfiguration'
> >
> >
> > at
> >
> org.drools.compiler.PackageBuilderConfiguration.addDialect(PackageBuilderConfiguration.java:274)
> > at
> >
> org.drools.compiler.PackageBuilderConfiguration.buildDialectConfigurationMap(PackageBuilderConfiguration.java:259)
> >
> >
> >
> >
> > at
> >
> org.drools.compiler.PackageBuilderConfiguration.init(PackageBuilderConfiguration.java:176)
> > at
> >
> org.drools.compiler.PackageBuilderConfiguration.<init>(PackageBuilderConfiguration.java:153)
> > at
> >
> org.drools.compiler.PackageBuilder.<init>(PackageBuilder.java:242)
> >
> >
> > .
> >
> > .
> >
> > .
> >
> > Caused by: java.lang.NullPointerException
> >
> > at
> >
> org.drools.rule.builder.dialect.java.JavaDialectConfiguration.setCompiler(JavaDialectConfiguration.java:92)
> > at
> >
> org.drools.rule.builder.dialect.java.JavaDialectConfiguration.init(JavaDialectConfiguration.java:55)
> > at
> >
> org.drools.compiler.PackageBuilderConfiguration.addDialect(PackageBuilderConfiguration.java:270
> >
> >
> >
> >
> > Problem I found :
> >
> > In the class JavaDialectConfiguration in jar file
> > drools-compiler.jar there
> > is a method named "setCompliler", in this
> > method Null Pointer
> > Exception was coming.
> >
> >
> >
> > Solution I provided :
> >
> >
> > In my application I created my custom class
> > CustomJavaDialectConfiguration
> > by extending to class JavaDialectConfiguration, In
> this
> > class I overrided
> > the method setCompiler. My method was exactly same as
> that
> > of method setCompiler
> > in JavaDialectConfiguration . To call my dialect class
> I
> > also overrided
> > the method "addDialect" of
> > PackageBuilderConfiguration class
> > . For that I created class
> > CustomPackageBuilderConfiguration by extending
> > to PackageBuilderConfiguration.
> >
> > after that I wrote the code:
> >
> >
> >
> > PackageBuilderConfiguration cfg = new
> > CustomPackageBuilderConfiguration();
> >
> >
> > KnowledgeBuilder kbuilder =
> > KnowledgeBuilderFactory.newKnowledgeBuilder(cfg);
> >
> >
> >
> >
> >
> >
> > Now application is running perfectly fine from both
> eclipse
> > and command
> > prompt without any exception.
> >
> >
> >
> > I want to know as my overrided method
> > "setCompiler" was exactly
> > same then why I had to override method, and In
> original
> > code (ie in drools-compiler.jar
> > file) why it was giving exception ??? Was that
> > due to class
> > lader or something else ?? Please do help in this
> > regard ....
> >
> >
> >
> >
> >
> >
> >
> >
> > Thanks & Regards:
> >
> >
> >
> > Pankaj Jain | L&T infotech |Navi Mumbai
> >
> > Mobile: +91 9920218945
> >
> > Email : pankaj.jain(a)lntinfotech.com
> >
> > www.Lntinfotech.com
> >
> >
> >
> > "Whatever the mind of man can conceive & believe,
> > it can achieve."
> >
> >
> >
> > Larsen & Toubro Infotech Ltd.
> >
> > www.Lntinfotech.com
> >
> >
> >
> > This Document is classified as:
> >
> >
> >
> > L&T
> > Infotech Proprietary L&T
> > Infotech Confidential L&T
> > Infotech Internal Use Only L&T
> > Infotech General Business
> >
> >
> >
> > This Email may contain confidential or privileged
> > information for the intended
> > recipient (s) If you are not the intended recipient,
> please
> > do not use
> > or disseminate the information, notify the sender and
> > delete it from your
> > system.
> >
> >
> >
> >
> ______________________________________________________________________
> >
> >
> > -----Inline Attachment Follows-----
> >
> > _______________________________________________
> > rules-users mailing list
> > rules-users(a)lists.jboss.org
> > https://lists.jboss.org/mailman/listinfo/rules-users
> >
>
>
>
>
> _______________________________________________
> rules-users mailing list
> rules-users(a)lists.jboss.org
> https://lists.jboss.org/mailman/listinfo/rules-users
>
16 years, 7 months
