[rules-users] Class Cast Exception
Mark Proctor
mproctor at codehaus.org
Thu Nov 1 23:05:56 EDT 2007
Doesn't Seam have it's over version of Drools, maybe thats on a
different version?
Robert Morse wrote:
> This has come up before, but I think my circumstances may be different.
> I'm using Seam 2.0.0.CR2, Drool 4.0.3, and JBoss AS 4.2.1 along with
> all of the relevant support jars.
> I have a Java Application that uses the JBoss server for entity beans,
> etc. It uses Drools PackageBuilder, loads the drl file and fires the
> rules without any problems.
>
> I'm now moving that same functionality to a stateful Seam bean. When
> a user clicks on a button, I invoke an action which executes the same
> code as in the stand alone java application. However, when it
> attempts to create a new PackageBuilder via new PackageBuilder() it
> throws:
>
> 18:05:18,610 ERROR [STDERR] org.drools.RuntimeDroolsException: Unable
> to load dialect
> 'org.drools.rule.builder.dialect.java.JavaDialectConfiguration:java'
> followed by:
>
> 18:05:18,621 ERROR [STDERR] Caused by: java.lang.ClassCastException:
> org.drools.rule.builder.dialect.java.JavaDialectConfiguration
> 18:05:18,621 ERROR [STDERR] at
> org.drools.compiler.PackageBuilderConfiguration.addDialect(PackageBuilderConfiguration.java:147)
>
>
> I've seen this posted several times, and the suggested cause is
> missing jars in the classpath. However, I have all of the 4.0.3
> Drools jars, mvel14, and jdt-core jars in place.
> Obviously, it's some configuration problem since I have the exact
> thing working as a java application.
>
> Any suggestions?
>
> Thanks.
>
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