Error in Activator.java
by Mallory
Hi All,
I am new to drools and I am looking forward to receive help from experts out
here. I have created a new drools project where I will be using
drools-distribution-5.4.0.Final.
I have created three Source folders for drools-compiler-5.4.0.Final-sources,
drools-core-5.4.0.Final-sources and knowledge-api-5.4.0.Final-sources.
I have imported all the other binaries/JAR's available from the same
drools-distribution-5.4.0.Final folder using Java Build path.
I have been getting errors in all the three source folders and the errors
are related to Activator.java.
In all the import statements I am getting an error called The import
org.osgi cannot be resolved.
import org.osgi.framework.BundleActivator;
import org.osgi.framework.BundleContext;
import org.osgi.framework.ServiceReference;
import org.osgi.framework.ServiceRegistration;
import org.osgi.util.tracker.ServiceTracker;
import org.osgi.util.tracker.ServiceTrackerCustomizer;
I am not sure where to find org.osgi. Any help related to this is greatly
appreciated.
Thanks in advance,
Mallory
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12 years, 10 months
Drools upgrade
by erolagnab
Hi,
After upgrading from 5.0.1 to 5.4.0, i've experienced some unresolvable
issue
(http://drools.46999.n3.nabble.com/UnsupportedOperationException-intermite...).
As reproducing the issue is totally not trivial and i can't prove if
upgrading to 5.5 or even 5.6 would warantee fixing it 100%. Hence i'm
thinking of going back to 5.0.1 which serves us okie despite the fact that
each rule update will cost lots of GC as it refreshes the whole rule
instance.
For that, the only reason we wanted to ugprade to 5.4.0 was the
KnowledgeBase incremental build feature which was introduced from 5.1.M1.
Before i spend time on figuring out whether it's possible to patch 5.0.1
with incremental build feature from 5.1.M1, i would like to seek for
suggestions and ideas in this forum.
My concerns are:
1. How big is the refactoring required to patch 5.0.1 with incremental build
feature? What side effects would i expect to have if patching successfully?
2. Was there any other option that i can take to: no intermittent issue with
my rules and GC is in a good level?
Many thanks,
Trung
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12 years, 10 months
Archive option for package snapshot
by IPatel
Hi,
I see that there is an "Archive Selected" tab for the assets under the
package snapshot and i have following questions.
When i select an asset (business rules or from a techinical rule) and click
on the Archive Selected, the system archives it (meaning the asset is
removed from the current view of the package snapshot)
1) how can i restore the archived asset? i was not able to see the list of
the assets archived from the snapshot under Administration ->archive tab.
2) i can archive Package Snapshot itself?
3) When i use compare option when comparing 2 snapshot packages, i see a
list of the assets that are archieved with Type = Restore. Can someone
please explain what does this mean when comparing 2 snapshot packages and
why it is saying "restored". Shouldn't it say "archived"?
Also does any one has any good link that provides complete explaination on
Package Snapshot and Archive for Guvnor tool.
Thank you again for all your help
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12 years, 10 months
Hashing in JoinNode and CompositeObjectAdapter
by Philipp Herzig
Dear developers,
I have a question regarding the current implementation within reteoo.
In both cases, the JoinNode and CompositeObjectAdapter is doing a linear
search for Joins and "Splits" respectively.
For the BetaNodes the decision using lists or maps is done in
SingleBetaContraints() (line 82)
this.indexed = depth >= 1 && DefaultBetaConstraints.isIndexable( constraint
);
However, the MVELContraint (constraint) always returns false for an
equijoin predicate (always the MVELContraint constructor without index flag
is called). Consequently, createBetaMemory() creates lists rather than
maps. These are finally joined in assertLeftTuple and assertObject of the
JoinNode with complexity 2n-1.
(Note: Of course, IndexLeftBetaMemoryOption.YES
and IndexRightBetaMemoryOption.YES are set but ignored according to the
SingleBetaContraints' constructor).
Relatively similar the CompositeObjectAdapter:
While propagating objects (CompositeObjectAdapter.propagateAssertObject)
the method asks if a fieldIndex is hashed which always returns false.
However, I cannot find any possibility to set this flag to true.
Interestingly the fields are added to a collection called
hashedFieldIndexes in FieldIndex.registerFieldIndex. Moreover the code for
dispatching to the right sink via hashcode is there, but is not reachable
anyway.
Are there any design related reasons for not supporting this or am I
missing something? If not, I would love to open a FR for that. If someone
helps me in setting up the mvn stuff I could do that myself.
(Version 5.4.0.Final)
Thanks,
Philipp
12 years, 10 months
Re: [rules-users] How to deploy drools 5.5 on weblogic in eclipse
by droolist
The trace indicates there is an attempt to connect to a DB running on your
local.
I doubt Drools is trying to connect to a DB, unless you have objects in your
rules that access DB.
It looks like you are getting this error while deploying a webservice that
happens to use Drools Expert jars.
it is possible that this is coming from your application code and not
Drools.
I see you have another post on Guvnor 5.5 and Weblogic 11. I had no success
with that either. I had a similar post and didnt get any response. so, I
doubt anybody has done that succesfully. WLS 11 is jee5 and does not support
CDI. Even with WLS 12 (jee6), I couldnt as there seems to be conflicts with
wls and weld cdi implementations. I'll watch your other post to see if
anybody responds as I am curious as well.
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12 years, 10 months
Cannot invoke method because of ArrayIndexOutOfBoundsException
by Bojan Janisch
Hello Guys,
sorry to bother you with this problem, but I'm out of ideas.
I'm using Drools in textmining-context and in basic I have
a function that checks 2 named entites for equality to
ensure that the entities are all different and that the rules
do work only on different named entity objects:
public static boolean isEqual(Annotation a, Annotation b){
if(a.equals(b)){
return true;
}
return false;
}
Sometimes there are conditions that need tests of more than
2 named entites. For this I've written a super method that
calls the isEqual method in a loop:
public static boolean isEqual(Annotation... a){
ArrayList<Annotation> outLoop = new ArrayList<Annotation>(Arrays.asList(a));
ArrayList<Annotation> inLoop = new ArrayList<Annotation>(Arrays.asList(a));
for (Annotation anno1 : outLoop) {
inLoop.remove(anno1);
for (Annotation anno2 : inLoop) {
if(isEqual(anno1,anno2)){
return true;
}
}
}
return false;
}
My rules could (theoretically) now call the function
eval(isEqual($ne1,$ne2)) or
eval(isEqual($ne1,$ne2,$ne3) or even
eval(isEqual($ne1,$ne2,$ne3,$ne4,$ne5)) and so on.
So there starts my problem:
Each time I'm getting an ArrayIndexOutOfBounds Exception from the second
method that looks like this:
java.lang.RuntimeException: cannot invoke method: isEqual
...
at java.lang.Thread.dispatchUncaughtException(Thread.java:1888)
Caused by: java.lang.ArrayIndexOutOfBoundsException: 3
at org.mvel2.optimizers.impl.refl.nodes.MethodAccessor.executeAll(MethodAccessor.java:149)
at org.mvel2.optimizers.impl.refl.nodes.MethodAccessor.getValue(MethodAccessor.java:48)
at org.mvel2.ast.ASTNode.getReducedValueAccelerated(ASTNode.java:108)
at org.mvel2.compiler.ExecutableAccessor.getValue(ExecutableAccessor.java:38)
...
Could someone explain me what's wrong with my code? Thanks for any help.
Greetings
JB
12 years, 10 months
Working on the complete solution set on Drools Planner
by lbrito
Hi,
I am thinking about using Drools Planner for an internal project related to
order scheduling. It would in essence be a jobshop where we have 3 main
machines which are always followed on the same specific order (and we have
release dates for each task).
I thought about a solution that would shuffle the job sequences on each
machine looking for the best combination. However, the problem is that when
applying the rules on the drl to the score calculation I would need to
"pre-process" the solution in order to determine start-dates and end-dates
for all tasks/jobs.
Is there a way to access the complete solution from the drl, mash-up the
information and use it in the score calculation?
Kind Regards,
Luis
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12 years, 10 months
