JBRULES-2796 - NullPointerException in FromNode.destroyCreatedHandles
by Gareth Evans
Hello,
I think I am getting the same/similar problem as described in
JBRULES-2796. I am using Drools 5.1.1 with Expert and Flow, here is
the stack trace:
Caused by: java.lang.NullPointerException
at org.drools.reteoo.FromNode.destroyCreatedHandles(FromNode.java:336)
at org.drools.reteoo.FromNode.retractLeftTuple(FromNode.java:326)
at
org
.drools
.reteoo
.CompositeLeftTupleSinkAdapter
.doPropagateRetractLeftTuple(CompositeLeftTupleSinkAdapter.java:238)
at
org
.drools
.reteoo
.CompositeLeftTupleSinkAdapter
.propagateRetractRightTuple(CompositeLeftTupleSinkAdapter.java:155)
at org.drools.reteoo.JoinNode.retractRightTuple(JoinNode.java:151)
at org.drools.reteoo.ObjectTypeNode.retractObject(ObjectTypeNode.java:
232)
at org.drools.reteoo.EntryPointNode.retractObject(EntryPointNode.java:
231)
at
org
.drools
.common.AbstractWorkingMemory.retract(AbstractWorkingMemory.java:1288)
at
org
.drools
.base.DefaultKnowledgeHelper.retract(DefaultKnowledgeHelper.java:201)
at
org
.drools
.base.DefaultKnowledgeHelper.retract(DefaultKnowledgeHelper.java:214)
at
procs
.Rule_my_business_rule_0
.defaultConsequence(Rule_my_business_rule_0.java:8)
at
procs
.Rule_my_business_rule_0DefaultConsequenceInvoker
.evaluate(Rule_my_business_rule_0DefaultConsequenceInvoker.java:29)
at org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:
917)
The stack trace is different to the one in JBRULES-2796 in that mine
is caused by a retract rather than an update.
We've created several Flows and associated rules and this issue has
only just come up with a recently created one.
Firstly, is this the same issue?
If it is, where could I find previous releases of Drools so that I may
try to downgrade? Alternatively is there some 5.1 -> 5.2 migration
documentation?
I have tried rewriting the rule that triggers this as there was a
comment on rules-dev that this made the error go away though I am
having trouble coming up with different ways to write it as it is
quite a simple rule. Is there something specific I should try to avoid?
--
Gareth Evans
Application Developer
Geneoz Pty Ltd
http://www.geneoz.com
gevans(a)geneoz.com
+61 8 9212 2200 (Phone)
+61 8 9212 2299 (Fax)
PO Box 1128
Bentley DC, WA 6983
AUSTRALIA
Now Introducing...
geneoz VMS
The Vivarium Management Solution
http://www.geneoz.com
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14 years, 11 months
Problems with Drools 5.2.0.M1 and IE7?
by John Peterson
Has anyone experienced problems running with the graphic layout of Guvnor with Drools 5.2.0.M1 on Internet Explorer 7? It appears to be okay with IE8.
Thanks.
14 years, 11 months
addpackagefromdrl removed and multiple DSL functionality lost?
by drdaveg
Several posts refer to a pre-5.0 addpackagefromdrl method that builds a rule
file for an associated DSL file. This let multiple DRL files be associated
to a specific DSL file for compilation.
KnowledgeBuilder.add(...) lets you add multiple DRL and DSL files, but it
seems as if the "expander" keyword (as noted in the list) is used by Eclipse
- not KnowledgeBuilder - to compile the DRL with the correct DSL. Also the
DSL file used to compile the DRL is now dependent on the .add statement
sequence with DSL's "hiding" other DSL's.
Is there an equivalent API call to addpackagefromdrl?
While one could have mutiple KnowledgeBuilder's, each with a
StatefulKnowledgeSession, this would push orchestra of many applications
(like my BPM application) to Java - instead of Drools.
--
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14 years, 11 months
configuring drools timers (and persistence)
by Jordi Alvarez
Hello, I am involved in a project in which we are using Drools Flow 5.1.1.
as the underlying BPM.
We have drools integration with Spring. We are using JPA+Spring+Drools
integration, and have setup the knowledge base and stateful session as
indicated in the drools spring integration documentation. Our BPM has
external clients that call adaptor methods for Drools. That is, drools is
never used in a direct way from an external client. We use this strategy in
order to provide some additional behaviour and also in order to provide
transactional behaviour as it is usually made with Spring.
We needed to partially apply the patch reported at the end of:
http://drools.46999.n3.nabble.com/5-1-0-CR1-Drools-Spring-Configuration-C...
"3. Interesting thing is that I have to recreate "Environment" now every
time before reloading the Session, otherwise the entityManager is closed,
and it does not respond to a simple Spring AOP TM wrapping... But that is
another issue.. "
We still have some persistence problems when using drools Timers. The
problems arise when drools creates the transaction itself (the timers
execution is the only situation in our scenario where this happens). We do
have some listeners which persist some information in our own tables. These
listeners are not prepared to use drools-created transaction (a different
entity manager is used). For this reason and also some others (as reported
in
http://drools.46999.n3.nabble.com/Drools-5-1-Flow-in-a-quot-Clustered-quo...),
we would like to configure the timer service used
internally by Drools.
Looking at drools source code, it seems that it should be possible, since a
defult implementation is provided by drools (
JDKTimerService and JpaJDKTimerService if persistence is used). For example,
class KnowledgeStoreServiceImpl seems to define a set of default services
(which could pressumably be overriden someway). Nevertheless, after looking
to that for a while we have found no specific documentation and no clear way
to do that for our Spring integration.
Is there a way to change the TimerService implementation provided by Drools?
Any help is appreciated.
Thanks very much in advance!
Jordi Alvarez
14 years, 11 months
How do I validate my DRL file
by Vijeth Raj
Hi ,
I am working on a Grails project where I have a web UI where the user
can define rules with all the conditions and the .DRL file will be
generated. Finally when the user clicks on a validate button ,my
application should validate the defined rules (which is in .DRL file) to
check for errors.
So now my question is :How do I validate my DRL file?
Can any one please guide me how can I achieve this?
Thanks in advance.
Vijeth Raj K
vijethrajk(a)gmail.com
14 years, 11 months
5.2.0.M2 issue using import functions
by wendy
Hi,
I've been using Drools 5.1 and I'm in the process of switching over to
5.2.0.M2. I have a file containing many custom public static functions that
our rules use. With 5.1 I could just "import function MyRuleFunction.*;"
and then use them in the 'when' part of the rule:
$example: ArrayList(size>3) from collect ($p: Person( eval (
exampleImportedFunction( name, "Bob")))
but with 5.2.0.M2 I'm getting an "unable to resolve method using
strict-mode: Person.exampleImportedFunction(java.lang.String,
java.lang.String)
which makes it look like it is only searching for functions on Person but
not in the 'import functions'.
If I add "import function MyRuleFunction.exampleImportedFunction;" it works
fine but I don't want to have to do that for every function in my file.
Functions used in the consequent don't seem to need to be imported
specifically (* works fine).
Has something changed between 5.1 and 5.2.0.M2 that effects this?
Thank you,
Wendy
--
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14 years, 11 months
Turning off mvel strict-mode evaluation in within Eclipse/Drools?
by drdaveg
A common problem in using Drools DSL is MVEL's "Unable to build
expression.....unqualified type in strict mode...." Many posts mention
error, I have looked at drools-compiler.jar, drools-core.jar, drools-api.jar
but I haven't found a real solution to the problem yet, i.e., a way to
unset strict mode compilation within the Eclipse editor/plug-in.
I have worked around this issue many times, but have an expression that
ignores my typing cues.
Can strict mode evaluation be unset via a property like one I might expect
in drools.default.rulebase.conf?
--
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14 years, 11 months
Simple Rule Flow
by sdinoo
I am new to drools
All I want to do is create a simple rule flow with a rule task that executes
a particular Rule-flow group
Here is what my rule looks like
rule "rule1" ruleflow-group "group1"
when
eval(true)
then
System.out.println("Bingo");
end
in my Rule flow i have
Start->hello world(sysouts Helo world) ->Rule Task->End
Rule Task attributes are configured with the rf group as "group1"
my calling program ProcessTest.java does have these two lines
kbuilder.add(ResourceFactory.newClassPathResource("ruleflow.rf"),
ResourceType.DRF);
kbuilder.add(ResourceFactory.newClassPathResource("Sample.drl"),
ResourceType.DRL);
BUT
When I run the program I only to see "Hello World" I expect to see "Hello
World" followed by "Bingo"
Iam certianly doing something wrong - Can you please help?
--
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14 years, 11 months
Regarding Drools - Expert and Fusion
by Sumeet Karawal
Hi,
Could somebody please let me know about any link or document for Best
Practices regarding JBoss Rules(Expert) and Fusion.
Also any link or document regarding Technical Architecture of JBoss Rules
(Expert) and JBoss Fusion Stack.
Thanks & Regards,
Sumeet Karawal
Mailto: sumeet.karawal(a)tcs.com
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14 years, 11 months
