[rules-users] Drools 5.0 - can't make it use Janino compiler - always wants eclipse jar

[Olli Knuuttila]

I had the same problem and solved it like this after going through the
source code:

        Properties props = new Properties();
        props.setProperty("drools.dialect.java.compiler", "JANINO");
        KnowledgeBuilderConfiguration config =
KnowledgeBuilderFactory.newKnowledgeBuilderConfiguration(props, null);
        KnowledgeBuilder kbuilder =
KnowledgeBuilderFactory.newKnowledgeBuilder(config);

Yours,
Olli


On Thu, Dec 31, 2009 at 5:57 PM, Martin Smith <msmith999999 at gmail.com>wrote:

> Hi folks,
>
> I'm doing some very basic evaluation of Drools and can't get past the
> first hurdle - the hello world example. I get this:
>
> ......
> Caused by: java.lang.RuntimeException: The Eclipse JDT Core jar is not
> in the classpath
>       at
> org.drools.rule.builder.dialect.java.JavaDialectConfiguration.setCompiler(JavaDialectConfiguration.java:94)
>       at
> org.drools.rule.builder.dialect.java.JavaDialectConfiguration.init(JavaDialectConfiguration.java:55)
>       at
> org.drools.compiler.PackageBuilderConfiguration.addDialect(PackageBuilderConfiguration.java:270)
>
> I'm not using Eclipse, my IDE is netbeans 6.8. I get the same error
> running the compiled jar from outside netbeans as well so I don't
> think it's related to the IDE.
>
> I modified the example by adding a knowledge builder config and then this:
>
> kconfig.setProperty("drools.dialect.java.compiler", "JANINO");
>
> This had no effect. I rewrote the example to use a package builder and
> set the compiler property on it to JANINO. Again, it didn't work. I
> also tried passing a -Dproperty with the same thing. Again, no effect.
>
> I have the janino jar from the download on the classpath along with
> the other jars it says are necessary.
>
> It works if I download and add the eclipse jar to the classpath but I
> don't want to do this as I don't want my runtime app to depend on
> pieces of eclipse.
>
> I'm out of time and ideas now so asking for help here. These are the
> drools related jars I have in the project:
>
> antlr-runtime-3.1.1.jar
> drools-api-5.0.1.jar
> drools-compiler-5.0.1.jar
> drools-core-5.0.1.jar
> joda-time-1.6.jar
> mvel2-2.0.10.jar
> janino-2.5.15.jar
> xstream-1.3.1.jar
>
> Thanks,
>
> Martin
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>
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