Drools Planner: what if possible values of a PlanningVariable are dependent of another one?
by Willem van Asperen
Hi All,
I have a PlanningEntity that has several planning variables, say A and
B. Now, if A is O then B can be X or Y and when A is P then B can be Y or Z.
I see two routes:
* create a solution property that generates X, Y and Z as alternatives
for B and rely on the score rules to dismiss improper values,
depending on the value of A
* create an entity property that only generates the possible values
for B (i.e. X,Y for A=O and Y,Z for A=P)
What is the best route?
(Alternatively I do not use the constructionHeuristic and just start of
my solution with a randomly (but correct) generated solution)
Regards,
Willem
11 years, 11 months
Spring, KnowledgeAgent, and Guvnor
by paulB
I'm having a problem connecting my KnowledgeAgent to a package in Guvnor.
I'm using Spring to instantiate the KnowledgeAgent. The agent initializes
perfectly well when I point to a local change-set that in-turn points to a
local rule. However, even though I have the same rule in a package in
Guvnor, the KnowledgeAgent fails with the following exception when I point
to the package's change-set in Guvnor:
The code at KnowledgeBaseImpl.java:148 is (using 5.3.0.Final):
Here is the simple rule in the Guvnor as returned by the URL for the package
source URL:
Here is the local change-set definition. The line that is commented is the
failing resource, whereas the local file resource works fine:
Guvnor is residing on a Tomcat server.
I could not find anything related to this on the forum. Thank you for any
hints.
-Paul
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11 years, 12 months
named query TasksAssignedAsPotentialOwner doesn't work with MySql db
by Frank Knoll
Hi,
When I add a task (having two potential owners) by calling the method
addTask followed by calling the method getTasksAssignedAsPotentialOwner of
org.jbpm.task.service.TaskClient I expect to receive a list of TaskSummaries
containing at least the previously added task. But I actually get an empty
list!
Here is my setup and possible solution:
I am using the trunk version of
./jbpm-human-task/src/main/resources/META-INF/orm.xml and a MYSQL database.
When calling addTask the Task table will be populated with a NULL
actualOwner_id.
The named query TasksAssignedAsPotentialOwner
"select new org.jbpm.task.query.TaskSummary(...t.taskData.actualOwner...)
from ... left join t.taskData.actualOwner ..." of orm.xml generates SQL
consisting of an inner join "inner join OrganizationalEntity user7_ on
task0_.actualOwner_id=user7_.id" which doesn't take the NULL actualOwner_id
correctly into account.
When I replace the named query TasksAssignedAsPotentialOwner with
"select new org.jbpm.task.query.TaskSummary(...actualOwner...) from ...left
join t.taskData.actualOwner as actualOwner ...", then the generated SQL
consists of an "left outer join OrganizationalEntity user2_ on
task0_.actualOwner_id=user2_.id" which takes the NULL actualOwner_id
correctly into account. So I get a List of TaskSummaries containing the
added task.
Is this a correct fix?
Cheers, Frank
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12 years, 1 month
Error Inserting events into drools fusion stream
by Ayush
Hi All,
I'm trying to implement drools fusion into my app. The scenario of my app is
as follows:
- Facts will be received continuosly.
- On receving fact I'm generating a new event and adding it into a new
working memory entry point stream. Also I'm adding facts into session coz
I'll be updating them.
- I need to apply rules on continuous stream of events.
- I've not used any camel + spring or pipeline. Are these mandatory to use?
For 1st fact everything works fine but when I receive 2nd fact I'm getting
Now when I'm trying to get entry point on receive of 2nd alarm I'm getting
org.drools.RuntimeDroolsException: Unexpected exception executing action
org.drools.reteoo.PropagationQueuingNode$PropagateAction@9ff411 Caused by:
java.util.concurrent.RejectedExecutionException.
On debug I found that the above exception is coming when I'm calling
session.getWorkingMemoryEntryPoint("MyStream"); Can anyone please help me
that how should I insert facts and events into working memory?
I'd invested ample amount of time searching for this but I'm empty handed.
Guys please help this is very urgent for me. Thanks in anticipation
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12 years, 2 months
Upgrade from drools 5.4 to 6.0.0-Beta3 - Legacy API Adapter JAR
by MaverickDrools
Hi,
There is not enough documentation on drools v6.0.0-Beta3, but this is what
I'm trying to do.
Our system was designed with 5.3 but then we encountered the issue with
synchronization (https://issues.jboss.org/browse/JBRULES-3283), so we
upgraded to v 5.4.
Things worked fine until we multithreaded the client code due to which we
faced another issue (https://issues.jboss.org/browse/JBRULES-3675)
So finally now, I'm trying to upgrade to 6.0.0-Beta3 since both those issues
should've been fixed with 6.0.0-Alpha1. The problem I'm facing is, I do not
have enough documentation to look at to see how to convert those things. I
went through the slides etc that were posted on the mailing list for the
conferences, but I'm still unable to figure it out correctly..
So, can someone point me to a JUnit or something that I can look at to
figure this thing out?
static {
KieServices ks = KieServices.Factory.get();
KieRepository kr = ks.getRepository();
Resource res = ks.getResources().newFileSystemResource(
"src/main/resources/rules/abc.drl");
KieModule kModule = kr.addKieModule(res);
kc = ks.newKieContainer(kModule.getReleaseId());
}
throws an exception on kr.addKieModule(res) which says Error in opening zip
file.. I assume we are now expecting a jar instead of a plain drl file. Is
there a way to convert this drl into a jar that the 6.0 code can understand
(for compatibility purposes with the existing system)?
Another thought was to make use of the Legacy API Adapter JAR, but I
couldn't find any examples of the same. Can you point me to a code
sample/JUnit that could explain how this works?
Thanks
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12 years, 2 months
Guvnor enumerations
by Stephen Masters
Hi folks,
I don't suppose anything notable changed between 5.3 and 5.5 in the way Guvnor loads data enumerations?
I have a number of enumerations similar to the following:
'MyFact.currencies' : (new com.myapp.guvnor.enums.CurrencyEnum()).isoCodes()
But I see the exception in Guvnor:
Unable to load enumeration data.
[Error: unable to invoke method: isoCodes] [Near :{... 'MyFact.': ….}] ^ [Line: 1, Column: 1]
Error type: org.mvel2.PropertyAccessException
The jar is in the lib directory, there is a method called "isoCodes()", and when I run the main class inside it then the various enumerations are returned. And yes, it did (does) work absolutely fine in 5.3 with this same configuration.
Steve
12 years, 3 months
Planner with a list of planning variables
by Justin Case
Hello all,
can I use as planning variable a list of values?
Here's a test use case: planning a food recipe, where the recipe can have say maximally 5 ingredients (taken from the solution property, I guess). So far I could find in the examples and documentation, it's all about ONE planning variable in the solution, but here I'd need a LIST of such... is it actually doable this way?
I cannot do it the other way around, as an ingredient may be found in more recipes...
Many thanks,
JC
12 years, 3 months
