Blocker-Issue when upgrading to drools 5.5

[Ajay Garg]

Hi all.

We have been trying to upgrade to drools-5.5, and have been doing a run-debug-install-run-cycle upgrades of jars.
Unfortunately, this time we are stuck at a position, wherein there is absolutely no information as to what we need next.

On compiling the rules, we get the following stacktrace ::

java.lang.IncompatibleClassChangeError: Implementing class
  at java.lang.ClassLoader.defineClass1(Native Method)
  at java.lang.ClassLoader.defineClass(ClassLoader.java:643)
  at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
  at org.apache.catalina.loader.WebappClassLoader.findClassInternal(WebappClassLoader.java:2836)
  at org.apache.catalina.loader.WebappClassLoader.findClass(WebappClassLoader.java:1160)
  at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1668)
  at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1546)
  at org.drools.rule.builder.RuleBuildContext.<init>(RuleBuildContext.java:73)
  at org.drools.compiler.PackageBuilder.addRule(PackageBuilder.java:2825)
  at org.drools.compiler.PackageBuilder.compileRules(PackageBuilder.java:970)
  at org.drools.compiler.PackageBuilder.compileAllRules(PackageBuilder.java:879)
  at org.drools.compiler.PackageBuilder.addPackage(PackageBuilder.java:871)
  at org.drools.compiler.PackageBuilder.addPackageFromDecisionTable(PackageBuilder.java:447)
  at org.drools.compiler.PackageBuilder.addKnowledgeResource(PackageBuilder.java:711)
  at org.drools.builder.impl.KnowledgeBuilderImpl.add(KnowledgeBuilderImpl.java:51)

Note that we have already ,

1)
Upgraded to mvel2-2.2.0.Final.jar

2)
Removed "drools-api.jar" altogether, and instead deployed "knowledge-api.jar".

3)
Upgraded drools-core, drools-compiler, drools-jsr94, drools-decisiontables, drools-templates to 5.5.




We will be grateful if some of the experts might lead us to know as to what we should upgrade/replace next :)

Looking earnestly for a reply.



Thanks and Regards,
Ajay

[Ajay Garg]

Any ideas anyone, please ...  ?

[Mark Proctor]

Somehow it's picking up the wrong jar, that will be on a different version. It will be almost impossible for someone not onsite to debug this.

The stack trace exits at line 73 on this class, where it tried to load the Rule class. Indicating either api, core or compiler has a miss matched version.

https://github.com/droolsjbpm/drools/blob/5.5.0.Final/drools-compiler/src/main/java/org/drools/rule/builder/RuleBuildContext.java#L73

Can you first get this running outside of a web container?

Also you should be trying 5.6 not 5.5.

Mark

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[Davide Sottara]

Also, drools 5.5 did not use mvel 2.2.2, which is almost certainly incompatible due
to the upgrade in some key internal components (ASM just to cite one)

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[Ajay Garg]

Thanks Mark and Davide for the helpful replies.

I will retry with 5.6 binaries.

@Davide, @All,

I will be really grateful if you guys could let me know what mvel/mvel2 version to use with 5.6?

This would save a lot of head-banging for me :)

Thanks and Regards,
Ajay

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Regards,
Ajay

[Mark Proctor]

All this information is in the maven pom

https://github.com/droolsjbpm/droolsjbpm-build-bootstrap/blob/5.6.0.Final/pom.xml

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[Ajay Garg]

Thanks guys ... I could move forward by leaps and bounds...

Seems all jar-version-mismatches have gone (I hope so) :)

Now, it seems that there is some change required in defining the rules in the XLS file, as I am getting ::

############################################################################
Unable to resolve ObjectType 'Eval' : [Rule name='xx-yyy-zzzz']
############################################################################

Will be grateful to know the procedure to resolve this :)

Thanks and Regards,
Ajay

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Regards,
Ajay

[Davide Sottara]

Something may have changed in the way "free-form" expressions are handled.

You may have an "eval(...)" expression in your DT and the "eval" may no longer be necessary,
just use the expression.

@Michael, any idea/confirmation?

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[Michael Anstis]

I suspect the spreadsheet application has "kindly" capitalized "eval" to "Eval".

Dumping the DRL generated from the decision table would probably furnish "Eval(..)" and Drools is then trying to resolve this to a type.

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[Ajay Garg]

Hi all.

I removed all occurrences of "eval" and "Eval" keywords (along with their corresponding parenthesis of course), and now I get the error ::

############################################################################
[ERR 102] Line 45:45 mismatched input '>=' in rule "xxxx-yyyy-zzzz"
[0,0]: Parser returned a null Package
############################################################################

I'll now try retaining all occurrences of "eval" and "Eval", but converting all "eval" to "Eval".

Keeping my fingers crossed for tasting success !!!

Thanks and Regards,
Ajay

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Regards,
Ajay

[Ajay Garg]

Hi all.

I re-tried, this time replacing all occurrences of "eval" with "Eval".

I get

##########################################################################
Unable to resolve ObjectType 'Eval' : [Rule name='xxxxx-yyyyy-zzzzzzz']

Unable to resolve ObjectType 'Eval' : [Rule name='xxxxx-yyyyy-zzzzzzz']

Unable to resolve ObjectType 'Eval' : [Rule name=''xxxxx-yyyyy-zzzzzzz]

Unable to resolve ObjectType 'Eval' : [Rule name='xxxxx-yyyyy-zzzzzzz']

##########################################################################

I am at loss of ideas :(

Has anyone managed to get rules-compilation working with drools-5.6?

Thanks and Regards,

Ajay

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Regards,
Ajay

[Davide Sottara]

There was probably a misunderstanding here.. "eval" should be lowercase.

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[Mark Proctor]

You misread. eval is correct, Eval is not. But Also you may no longer need eval at all any more.

Mark

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[Ajay Garg]

Thanks everyone.
Replacing all occurrences of "Eval" with "eval" caused the rules to be compiled successfully.

Thanks and Regards,
Ajay

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Regards,
Ajay