the key to the problem is this line in the error listing: "Caused by: java.lang.RuntimeException: The Eclipse JDT Core jar is not in the classpath"

This reference is to the library "core-3.4.2.v_883_R34x.jar" which is installed by the Eclipse Drools plugin

If you add core-3.4.2.v_883_R34x.jar to your libraries then you won't get the runtime exception.



On Tue, Mar 26, 2013 at 12:59 PM, Peach Wyss <peach_wyss@yahoo.com> wrote:
Hy

I get the following error:
...
   Caused by: org.drools.RuntimeDroolsException: Unable to load dialect 'org.drools.rule.builder.dialect.mvel.MVELDialectConfiguration:mvel:org.drools.rule.builder.dialect.mvel.MVELDialectConfiguration'
        at org.drools.compiler.PackageBuilderConfiguration.addDialect(PackageBuilderConfiguration.java:313)
        ...
        ... 42 more
    Caused by: java.lang.ClassCastException: org.drools.rule.builder.dialect.mvel.MVELDialectConfiguration cannot be cast to org.drools.compiler.DialectConfiguration
        at org.drools.compiler.PackageBuilderConfiguration.addDialect(PackageBuilderConfiguration.java:308)
        ... 51 more

I'm using drools in a maven project, pom.xml:
...
    <dependency>
        <groupId>org.drools</groupId>
        <artifactId>drools-compiler</artifactId>
        <version>5.5.0.Final</version>
    </dependency>
    <dependency>
        <groupId>org.drools</groupId>
        <artifactId>drools-core</artifactId>
        <version>5.5.0.Final</version>
    </dependency>
...

What could cause this error?

Thanks for your help.

Kind regards,
Peter

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