[rules-users] unable to resolve method using strict-mode

[cdelgado]

Hi all,

I am getting the same problem reported by vladperl. I've got rules and
rulesflows using MVEL2 scripts that work fine in Windows running in JBoss
and junit tests. I've inserted a map into StatefulKnowledgeSession and I am
successfully invoking myMap.myObject.myValue without any casting. However I
am now deploying the application in RedHat with Websphere 7 and I am getting
everywhere errors like:
unqualified type in strict mode for: myObject
unqualified type in strict mode for: myValue
unable to resolve method using strict-mode:
java.lang.Object.get(java.lang.String)]

It seems that somehow the MVEL's Strong Typing Mode has been setup in this
env. This doesn't make sense to me. I rather prefer to believe the error is
misleading and something else is bothering MVEL when parsing my rules and
ruleflow files.

Any help will be much appreciated!



vladperl wrote:
> 
> 
> Hi Wolfgang,
> Please take a look at attached new example.
> This time the example can demonstrate when strict mode is false we don't
> have to put class cast.
> Beside I finally figured out how to switch strict mode for MVEL dialect.
> 
> Best regards,
> Vladimir
> 
> Date: Sat, 3 Oct 2009 14:36:10 +0200
> From: wolfgang.laun at gmail.com
> To: rules-users at lists.jboss.org
> Subject: Re: [rules-users] unable to resolve method using strict-mode
> 
> The Java code in the archive just compiles a .drl file, and there's no
> reason this should fail. The class cast would only appear to be missing
> after a Map object is inserted into WM, and the session is run so that the
> rule fires.
> 
> -W
> 
> 2009/10/2 Vladimir Perlov <vladperl at hotmail.com>
> 
> 
> 
> 
> 
> 
> It's compiled and working on Windows without any casting :)
> Check out the test project I attached. 
> You will see that the rule  will compile  from web application (Windows
> only) or with Java SE application. The  web application using JSF so in
> case to run it use application server with included JSF library.
> 
> 
> http://download.java.net/glassfish/v3/promoted/
> 
> 
> Date: Fri, 2 Oct 2009 19:48:17 +0200
> From: wolfgang.laun at gmail.com
> 
> To: rules-users at lists.jboss.org
> Subject: Re: [rules-users] unable to resolve method using strict-mode
> 
> Map() in the .drl file is bound to be interpreted as Map<Object,Object> so
> that a Map.get() returns an Object. To be able to call method
> getSomeMethod() you'd have to cast this result, according to
> 
> 
>  ((SomeClass)$map.get("x")).getSomeMethod()
> 
> 
> I fail to understand how this could ever be avoided - strict or no strict,
> MVEL or not MVEL.
> 
> -W 
> 
> 2009/10/2 Vladimir Perlov <vladperl at hotmail.com>
> 
> 
> 
> 
> 
> 
> 
> Hi Wolfgang,
> Thank you very much for quick response!
> 
> I tried your suggestion and still getting the following error:
> 
> Unable to build expression for 'consequence': Failed to compile: 1
> compilation error(s): - (1,29) unable to resolve method using
> strict-mode: java.lang.Object.getSomeMethod() '
> System.out.println($map.get("x").getSomeMethod());
> ' : [Rule name='TEST']
> At least now I have only 1 compilation error comparing to the previous
> variant.
> 
> modified rule:
> 
> rule "TEST"
> 
> 
>     dialect "mvel"
>     when
>             $map : Map()
> 
> 
>     then
>             System.out.println($map.get("x").getSomeMethod());
> end
> 
> 
> 
> I believe that problem is related to strict-mode that somehow enforced on
> Linux but not on Windows.
> I tried to remove the strict mode using the the following approach but it
> seems don't have any effect.
> We have web application with many drools rules and it's working on Windows
> but when we deployed the same application to   Linux we are getting failed
> compile errors ;) 
> 
> 
> 
> KnowledgeBuilderConfiguration config =
> KnowledgeBuilderFactory.newKnowledgeBuilderConfiguration();     
> config.setProperty("drools.dialect.mvel.strict", "false");
> 
> 
> kbuilder = KnowledgeBuilderFactory.newKnowledgeBuilder(config);
> 
> Please advise me.
> 
> By the way I'm using drools 5.0.1
> 
> 
> Date: Fri, 2 Oct 2009 18:30:25 +0200
> 
> 
> From: wolfgang.laun at gmail.com
> To: rules-users at lists.jboss.org
> Subject: Re: [rules-users] unable to resolve method using strict-mode
> 
> 
> 
> 2009/10/2 Vladimir Perlov <vladperl at hotmail.com>
> 
> 
> 
> 
> 
> 
> 
> 
> Here is the rule that failed to compile on Linux:
> 
> rule "TEST"
>     dialect "mvel"
>     Send
>     when
>             map : Map()
> 
> $map : Map()
> 
> or omit '$' in the consequence.
> -W
>  
>     then
>             System.out.println($map.get("x").getSomeMethod());
> end
> 
> 
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> 
> 
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