[rules-users] Rules compilation error with OSGi integration (6.1.0.Beta3)
Ephemeris Lappis
ephemeris.lappis at gmail.com
Tue May 20 11:10:47 EDT 2014
In this case it's not a global, but a temporary variable in the rule
consequence. Indeed, the problem is not only about generics, but impacts
all the syntax elements that may have changed since Java 1.5, and make the
rules Java compiler fails when running in ServiceMix.
As I said before, the workaround is quite easy, changing all the Java code
to be compliant with the compilation level. The question is just about a
confirmation of the Felix's class loader (org/apache/felix/framework/
ModuleImpl$ModuleClassLoaderJava5) in the compiler's behavior, and a better
solution to be able to write RHS with a 'modern' syntax.
Thanks.
2014-05-20 16:56 GMT+02:00 Charles Moulliard [via Drools] <
ml-node+s46999n4029628h78 at n3.nabble.com>:
> Is it a list that you would like to use as global param ? If this is the
> case, maybe change your rule & code like that
>
> //GET A KSESSION
> StatefulKnowledgeSession ksession =
> kbase.newStatefulKnowledgeSession();
>
> //now create some test data
> ksession.insert( new Cheese( "stilton",
> 42 ) );
> ksession.insert( new Person( "michael",
> "stilton",
> 42 ) );
> final List<String> list = new ArrayList<String>();
> ksession.setGlobal( "list",
> list );
>
> ksession.fireAllRules();
>
> System.out.println(list);
>
> ksession.dispose();
>
> Rule
>
> template header
> age
> type
> log
>
> package org.drools.examples.templates;
>
> global java.util.List list;
>
> template "cheesefans"
>
> rule "Cheese fans_@{row.rowNumber}"
> when
> Person(age == @{age})
> Cheese(type == "@{type}")
> then
> list.add("@{log}");
> end
> end template
>
>
>
> On Tue, May 20, 2014 at 4:40 PM, Ephemeris Lappis <[hidden email]<http://user/SendEmail.jtp?type=node&node=4029628&i=0>
> > wrote:
>
>> Hello.
>>
>> I have no such kind test with Pax Exam. Should you send me a simple maven
>> project example using a Karaf container ?
>>
>> Back to the problem, a very simple rule with something like that in the
>> RHS always fails when deployed in a bundle whose class loader is the felix
>> one :
>>
>> List<String> l = new ArrayList<>();
>> that must be fixed with :
>> List<String> l = new ArrayList<String>();
>>
>> or
>>
>> int n = 1_000;
>> that fails instead of :
>> int n = 1000;
>>
>> FYI, I use ServiceMix 4.5.3.
>>
>> Thanks again.
>> Regards.
>>
>>
>>
>> 2014-05-20 15:41 GMT+02:00 Charles Moulliard <[hidden email]<http://user/SendEmail.jtp?type=node&node=4029628&i=1>
>> >:
>>
>> A test case will be required to reproduce your problem. Do you have a
>>> pax-exam test ?
>>>
>>>
>>> On Tue, May 20, 2014 at 1:03 PM, Ephemeris Lappis <[hidden email]<http://user/SendEmail.jtp?type=node&node=4029628&i=2>
>>> > wrote:
>>>
>>>> Hello.
>>>>
>>>> Here is the first lines of the error message :
>>>>
>>>>
>>>> 14:58:57,457 | ERROR | tp1946301910-151 | AbstractKieModule
>>>> |
>>>> 239 - org.drools.compiler - 6.1.0.20140429-1643 | Unable to build
>>>> KieBaseModel:MyKBase
>>>> Rule Compilation error : [Rule name='Main Rule']
>>>> my/tests/drools/osgi/expert/rules/Rule_Main_Rule1409557233.java
>>>> (8:649) :
>>>> Incorrect number of arguments for type HashMap<K,V>; it cannot be
>>>> parameterized with arguments <?>
>>>> my/tests/drools/osgi/expert/rules/Rule_Main_Rule1409557233.java
>>>> (8:666) :
>>>> Syntax error on token "<", ? expected after this token
>>>>
>>>>
>>>> I have found the explanation and a workaround : put it all with a strict
>>>> "1.5" syntax in the RHS ! In this current case, do not use <> to infere
>>>> the
>>>> generic type, but use the expected declared types instead.
>>>>
>>>> After a rather touchy remote debug of the ServiceMix runtime to inspect
>>>> what
>>>> is different from the Junit tests, I think that the problem comes from
>>>> the
>>>> classloader that is associated with the Kie container. Before
>>>> compilation
>>>> the language source and target level is set with version 1.7 as
>>>> expected,
>>>> but in the nameEnvironment that is passed to the JavaCompiler (indeed,
>>>> ecj
>>>> compiler), the droolsClassloader is of type
>>>> "org/apache/felix/framework/ModuleImpl$ModuleClassLoaderJava5". As its
>>>> name
>>>> seems to incidate, I'm afraid that the Karaf/Felix loader is originally
>>>> built in 1.5.
>>>>
>>>> I've read some posts about the eclipse compiler that perhaps takes into
>>>> account the caller compliance to adapt its compilation language level.
>>>>
>>>> Class loaders seem to be a serious problem when using Drools in complex
>>>> environment such as a OSGi one...
>>>>
>>>> Please, could you confirm my analysis, and, if you have one, propose any
>>>> better solution ? I don't know, for example, if it's possible to
>>>> influence
>>>> Karaf to use different levels of bundle class loaders...
>>>>
>>>> Thanks a lot.
>>>>
>>>> Regards.
>>>>
>>>>
>>>>
>>>> --
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>>>
>>>
>>>
>>> --
>>> Charles Moulliard
>>> Apache Committer / Architect @RedHat
>>> Twitter : @cmoulliard | Blog : http://cmoulliard.github.io
>>>
>>>
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>>
>>
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>
>
>
> --
> Charles Moulliard
> Apache Committer / Architect @RedHat
> Twitter : @cmoulliard | Blog : http://cmoulliard.github.io
>
>
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