[rules-users] Drools command line tools?

[Wolfgang Laun]

You can compile DRL and display all the errors using a simple Java program.
(In fact, many apps compile their DRL on the fly.) To run such a program
from the command line, use a simple shell script (or .bat file) that
establishes the Java environment (JAVA_HOME) and the classpath, according
to your application, and the essential Drools jars. Below is a shell script
doing this on my Linux box; Windows should be similar. Note that the exact
names of the jars need not be the same as given here.


export JAVA_HOME=/extra/JDK6u23/jdk1.6.0_23
javac=$JAVA_HOME/bin/javac
java=$JAVA_HOME/bin/java

export
CLASSPATH=.:/extra/drools/droolsjbpm/drools/drools-core/target/drools-core-5.3.0-SNAPSHOT.jar:/extra/drools/droolsjbpm/droolsjbpm-knowledge/knowledge-api/target/knowledge-api-5.3.0-SNAPSHOT.jar:/extra/drools/droolsjbpm/drools/drools-compiler/target/drools-compiler-5.3.0-SNAPSHOT.jar:/home/wlaun/.m2/repository/org/eclipse/jdt/core/compiler/ecj/3.5.1/ecj-3.5.1.jar:/extra/antlr/antlrworks-1.4.jar:/extra/drools/droolsjbpm/droolsjbpm-build-distribution/osgi-bundles/plugins/mvel2-2.1.0.drools1.jar

j="$(find $sub -name \*.java) $(find drools -name \*.java) $(find cc -name
\*.java)"
echo "compiling $j."

$javac $j
$java DroolsMain

=============================================

Here's the Java code I use for compiling with the above shell script:

import org.drools.KnowledgeBase;
import org.drools.KnowledgeBaseConfiguration;
import org.drools.KnowledgeBaseFactory;
import org.drools.builder.KnowledgeBuilder;
import org.drools.builder.KnowledgeBuilderError;
import org.drools.builder.KnowledgeBuilderErrors;
import org.drools.builder.KnowledgeBuilderFactory;
import org.drools.conf.ConsequenceExceptionHandlerOption;
import org.drools.definition.KnowledgePackage;
import org.drools.io.Resource;
import org.drools.io.ResourceFactory;
import org.drools.builder.ResourceType;
import org.drools.runtime.StatefulKnowledgeSession;

        KnowledgeBaseConfiguration kBaseConfig =
            KnowledgeBaseFactory.newKnowledgeBaseConfiguration();
        @SuppressWarnings("unchecked")
            ConsequenceExceptionHandlerOption cehOption =
            ConsequenceExceptionHandlerOption.get( (Class<? extends
ConsequenceExceptionHandler>)MyConsExHandler.class );
        kBaseConfig.setOption( cehOption );
        kBase = KnowledgeBaseFactory.newKnowledgeBase( kBaseConfig );

        KnowledgeBuilder kBuilder =
KnowledgeBuilderFactory.newKnowledgeBuilder();
        String drlPath = ...;
        if( drlPath != null ){
            Resource drl = ResourceFactory.newClassPathResource( drlPath,
getClass() );
            kBuilder.add( drl, ResourceType.DRL );
        }

        if( kBuilder.hasErrors() ){
            System.err.println( "### compilation errors ###" );
            KnowledgeBuilderErrors errors = kBuilder.getErrors();
            for( KnowledgeBuilderError err: errors ){
                System.err.println( err.toString() );
            }
            return;
        }

        kBase.addKnowledgePackages( kBuilder.getKnowledgePackages() );
        session = kBase.newStatefulKnowledgeSession();


Cheers
-W



On 30 October 2011 17:32, arrehman <arrehman73 at yahoo.com> wrote:

> Hi,
>
> I am using Drools 5.2 (direclty, not via grails plugins) in a grails
> 2.0.0.M2 web application. I use IntelliJ IDEA for development which does
> not
> support Drools inherently. (I know eclipse has better support) I am
> struggling with the compilations, syntax erros of .DRL file I have in my
> app. Are there any command line tools that will help me point out the exact
> syntax errors of the DRL file? Currently I am struggling, and doing a adhoc
> approach. I know there must be a better way.
>
> Thanks,
> Abdul
>
> --
> View this message in context:
> http://drools.46999.n3.nabble.com/Drools-command-line-tools-tp3465973p3465973.html
> Sent from the Drools: User forum mailing list archive at Nabble.com.
> _______________________________________________
> rules-users mailing list
> rules-users at lists.jboss.org
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