process-designer deserialization error
by AlfredoLatini
Hi,
i have a problem with oryx process-designer and drools guvnor. I have
created a process with process-designer and i saved it. Then i have opened
this file with eclipse and i uploaded this file in guvnor repository.
I have opened the process in drools guvnor and the following exception
occurred:
The server encountered an internal error () that prevented it from
fulfilling this request.</u></p><p>exception
<pre>javax.servlet.ServletException:
http://localhost:8080/designer/bpmn2_0deserialization
org.drools.guvnor.server.GuvnorAPIServlet.service(GuvnorAPIServlet.java:73)
javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
org.jboss.seam.web.ContextFilter$1.process(ContextFilter.java:42)
How can i fix this problem?
My jboss installation runs on port 8580 because 8080 is busy (oracleXE).
Thanks in advance
Alfredo.
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15 years, 5 months
Integration of Drools with Hadoop
by Roger Smith
We are working on a project to integrate Drools with Apache Hadoop,
http://hadoop.apache.org/, and run into some road blocks. We would very much
appreciate any suggestions/help from this list.
We have an app where we call drools rule engine inside the reducer task of a
Hadoop map reduce job. It throws a NullPointerException when we the rule
package resource to the knowledge builder. The same code works fine when
run as part of a stand alone app.
Code:
private static Map<String, StatefulKnowledgeSession> sessions =
new HashMap<String, StatefulKnowledgeSession>();
private static final String RULE_PACK_DIR = "
file:///home/roger/Projects/gridx/ <file:///\\home\pranab\Projects\gridx\>";
private static final String RULE_PACK_EXT = ".drl";
public int process(String rulePackage, String dateTime, String type)
throws TException {
int rate = 0;
StatefulKnowledgeSession session = sessions.get(rulePackage);
if (null == session){
KnowledgeBuilder kbuilder =
KnowledgeBuilderFactory.newKnowledgeBuilder();
String rulePackPath = RULE_PACK_DIR + rulePackage +
RULE_PACK_EXT;
kbuilder.add( ResourceFactory.newFileResource(rulePackPath ),
ResourceType.DRL);
if ( kbuilder.hasErrors() ) {
System.err.println( kbuilder.getErrors().toString() );
}
KnowledgeBase kbase = KnowledgeBaseFactory.newKnowledgeBase();
kbase.addKnowledgePackages(kbuilder.getKnowledgePackages());
session = kbase.newStatefulKnowledgeSession();
sessions.put(rulePackage, session);
}
ContractRule contractRule = new ContractRule();
contractRule.prepare(dateTime, type);;
FactHandle ruleHandle = session.insert(contractRule);
session.fireAllRules();
System.out.println("" + contractRule);
rate = contractRule.getRate();
session.retract(ruleHandle);
return rate;
}
This line throws the exception:
kbuilder.add( ResourceFactory.newFileResource(rulePackPath ),
ResourceType.DRL);
It works fine as a stand alone app, outside hadoop
Roger Smith
15 years, 5 months
Re: [rules-users] Guvnor and oryx designer problems (melc)
by Mahler, Björn
>Can someone please tell me a version of the oryx designer that works
>correctly with guvnor version 5.1 or 5.2.0-snapshot?
>Did anyone else have problems when trying to view on guvnor oryx designer a
>bpmn diagram created in eclipse?? Any solution??
Hi there,
i've the same or similar problem. In guvnor I cannot access uploaded bpmn2 diagrams... if I upload a classic rule-flow diagram I'm able to see it in guvnor.. but the link to the oryx-editor with bpmn2 ones wouldn't work...
I also have no clue, whether to define rule-flow groups in the oryx-designer... any suggestions on that?
Ciao
Björn
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15 years, 5 months
Upload an existing .drl for the Guvnor dynamically
by Vandewilly
Is there any api available that allows me to load an existing file drl for
the Guvnor repository. In my case, I can not upload through the web
interface, only in a dynamic way through a java class.
--
Vandewilly Oliveira
15 years, 6 months
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, 6 months
Drools 4.0, Support for multiple pattern in accumulate source pattern
by Juergen
It appears as if accumulate does support only a single pattern CE as
source pattern, e.g.:
Number() from accumulate(
Cheese(
price : price
),
sum( price )
)
Is it possible to have more than one pattern in the source pattern, e.g.:
Number() from accumulate(
Cheese(
price : price,
type : type
)
Person(
favouriteCheese == type,
age > 30
),
sum( price )
)
The same could be said for collect, but there the problem to specify
which item of a matching tuple is to be collected, but this could be
handled recreating collect via accumulate, e.g.:
Collection() from accumulate(
cheese : Cheese(
type : type
)
Person(
favouriteCheese == type,
age > 30
),
collect( cheese )
)
15 years, 6 months
Task Server as Jboss Service
by Cristiano Nicolai
Hi guys,
I think that would be great if we could deploy the TaskServer
(MinaTaskServer) as a JbossMC bean, making possible to administer it using
admin-console.
There's any work in this way or other plans to deploy this component?
Thanks.
--
Best regards,
Cristiano Nicolai
15 years, 6 months
"==" not work for big int value
by Zeke
Hi,
I'm using Drools 4.0.7. I find "==" operator does not work for big int
value (like 2147483647). The condition is like "sec.fir.i == 2147483647". I
attach my test code. With my simple testing, it seems that it does not work
for comparsion with int constant from 1000000001 to 2147483647. Is it a bug
of drools? I have already tested long and BigInteger do not have this kind
of problem.
Thanks!
15 years, 6 months
Weird Problem: WorkItemManager seems to loose WorkItems
by helo
Hello everyone,
I am encountering weird issues with the DefaultWorkItemManager. It seems to
somehow "loose" WorkItems occasionally. I haven't completely figured out
what is happening exactly which also means I can't provide a testcase that
reliably reproduces my error.
Let me give you a short description of my usage scenario: I'm using Drools
5.1.1 on a Win7-x64 PC with a JDK1.6.0_22-x64 VM. I'm trying to run lots of
process instances at the same time, lets say 100 for now. These are either
started right after each other (for-loop calling startProcess() each time,
always in a new thread) or with a random delay of up to 2000ms. The ksession
is running in a separate thread with fireUntilHalt().
In the processes I use, I try to implement some rule-based runtime process
modifications. The idea is that the process stops at a certain node, inserts
a special event containing process instance information into the
WorkingMemory, the rule engine evaluates the event and decides what
modifications to execute. Once those modifications are finished, the process
instance is notified and continues.
To realise this functionality, I created a class that implements
ProcessEventListener, AgendaEventListener and WorkItemHandler interfaces at
the same time. An instance of that class is registered for those three types
at startup of my Drools application.
I use the beforeNodeTriggered() event to create my own special event, in
executeWorkItem() I save the WorkItem and corresponding WorkItemManager and
insert my special event into WorkingMemory, triggering the drools rule
engine to evaluate it and execute modifications accordingly.
I use afterActivationFired() to get notified about the rule engine finishing
the modifications (I listen for a certain rule being fired, because that
rule is always fired last, no matter if there were modifications or not). In
afterActivationFired() I complete the WorkItem I saved before, thus letting
the process instance continue.
And that's the point where something goes wrong from time to time. Every now
and then, the call of completeWorkItem() has no effect. I investigated using
the debugger and the WorkItem in question is not registered with the
WorkItemHandler right before the call of completeWorkItem(), so that this
call can't do anything. This causes the process instance that created the
"lost" WorkItem to hang at the WorkItemNode with no way to have it continue
execution. The "lost" WorkItem has status 0 even after calling
completeWorkItem().
I tried tracing the path of the WorkItem, but so far, all I can say is that
WorkItems are always registered with the WorkItemManager at
executeWorkItem(), but at afterActivationFired() sometimes they are not. So
it has to happen between those two points in the code. However, I could not
find any way to remove a WorkItem from the WorkItemManager without changing
its status, so I have no idea what could cause this.
Initially I suspected concurrency issues because I had some
ConcurrentModificationExceptions as well. But since then I synchronized all
crucial parts (i.e. all parts using WorkItems or changing the process in any
way) on the RuleFlowProcess object and on the ProcessInctance object. This
fixed the CMEs but the "lost" WorkItems still occur from time to time.
I've really run out of ideas by now. Since this bug only occurs seldomly, it
is really hard to reconstruct what's going on. I've tried to strip away as
much of my coding as possible to see if this also happens in standard
drools, but I couldn't reproduce it so far. I guess it may have something to
do with the amount of work I perform in the rule engine for my modifications
because "dummy" WorkItemHandlers that just complete a WorkItem right away
don't seem to cause errors like the one I'm encountering.
If anyone has any idea what could cause this, any help would be hugely
appreciated. Also, feel free to ask questions if you need further
information. However, I can't really share my code publicly for various
reasons, but I will try to extract meaningful parts if necessary.
Regards
Henning Losert
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15 years, 6 months
Reference a declared FactType from another rule file?
by Gerret Hansper
Hi all,
does anybody know whether it's possible to reference a FactType declared
in one rule file from another one? I'm developing rules with Eclipse
(using Drools 5.0.1) and the rules are spread over a couple of .drl
files. It would be nice to be able to declare a FactType in one file,
have a rule insert instances of it into working memory and have another
rule in another file (but the same package) use it in its LHS.
I've tried various import statements but the compiler doesn't seem to be
able to resolve the reference.
Thanks,
Gerret
15 years, 6 months
