[rules-users] mvel strict-mode not applied in drools 5.3.1.Final

[korgen]

Hi folks,
In the process of upgrading from Java 1.6 to Java 1.7 (1.7.0_03 to be
precise) we updated Drools from 5.1.1 to 5.3.1 (as in 5.1.1 language level
1.7 is not supported).

However with Drools 5.3.1 the system property "drools.dialect.mvel.strict"
seems not to be applied all the time. I know this sounds fishy, but this is
the behaviour:

In a (junit based) test we create the knowledgebase by loading multiple drl
files. Each of them has the dialect 'mvel' set in its beginning. 
In our @BeforeClass of the test we do a:
System.setProperty("drools.dialect.mvel.strict", "false");

and I also tried using a KnowledgeBuilderConfiguration with the appropriate
settings.
But still sometimes the test fails with a "unable to resolve method using
strict-mode..." message. I say sometime because running the test multiple
times via maven "mvn -Dtest=ClassicDroolsTest test" sometimes produces
failure, sometimes produces success. 
It might by noteworthy that the method called in the test expects two
parameters of type Double, but as it seems Drools is not seeing the
covariant return type of the class which is actually used (the abstract base
method has return type Object, the concrete method has return type Double).

I tried to reproduce the issue with a simpler test setup to be able to post
it here but did not succeed.

I also applied the patch
https://github.com/droolsjbpm/drools/commit/1c20018abeef8bee86f896ffff7945404cebb18f
(comming from https://issues.jboss.org/browse/JBRULES-3163) to the Drools
5.1.1 sources, compiled them myself and everything works like a charm with
it. However I cannot use this unofficial work around as I can't (and don't
want) use a patched version of Drools in my environment.
Also when I compile & run my sources with jdk 1.6.0_31 everything is fine.

I'd really appreciate any help on this topic as I couldn't find any hints on
this behaviour in the release notes from Drools versions > 5.1.1

Thanks

Joerg

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