You have not setup your classpath correctly, this question has been asked and answered dozens of times. Try using a mailing list archive search tool, such as gmane or nabble, to find previous answers.

Mark wrote:

I am newbie to drools. I am facing the below exception when I m trying to run my code through
Command Prompt.
I have set the all the jars in the xbootclasspath of my application , but still I am getting the same exception.

I am able to run my application in eclipse , but the same when i run from Command Prompt give me this exception.

Please help to get through the situation.

My exception is :

org.drools.RuntimeDroolsException: Unable to load dialect ''
        at org.drools.compiler.PackageBuilderConfiguration.addDialect(
        at org.drools.compiler.PackageBuilderConfiguration.buildDialectConfigurationMap(

        at org.drools.compiler.PackageBuilderConfiguration.init(
        at org.drools.compiler.PackageBuilderConfiguration.<init>(
        at org.drools.compiler.PackageBuilder.<init>(
Caused by: java.lang.NullPointerException
        at org.drools.compiler.PackageBuilderConfiguration.addDialect(

Thanks & Regards

Pardeep Ruhil
L&T Infotech Ltd
Ph: +919820283884

Larsen & Toubro Infotech Ltd.

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