[rules-users] Running Drools 4 examples

[Jaroslaw Kijanowski]

Ron Kneusel wrote:
> Greetings!
> 
> I am attempting to run the HelloWorld example for Drools 4.  I have Eclipse 3.3 setup on Windows with the Drools plugin.  I have created a project with the Drools examples and added all the Drools .jar files to the project.  Everything compiles.  When I initially ran HelloWorldExample.java it appeared that it could not find the HelloWorld.drl file.  

Try to add src/main/rules to your source folders on build path.

 > So, I moved that file into the same directory as 
HelloWorldExample.java and ran again.  This time I am getting an error 
that the JDT compiler is not found even though it appears that there are 
JDT jar files in the Eclipse plugins.

Try to add org.eclipse.jdt.core_xxx as an external jar to your project's 
libraries.

BTW, both steps are performed by the drools plug-in when you create a 
Drools Project.

> 
> I also attempted to run this example under Linux from the command line.  In this case I placed all the Drools .jar files into the JRE ext folder and changed the source code to use the Janino compiler by adding:

It should be sufficient to have drools-compiler.jar, drools-core.jar, 
antlr-runtime.jar, mvel.jar and janino.jar in your classpath.

> 
> //  Set up for the Janino compiler, not Eclipse
> System.setProperty("drools.dialect.java.compiler", "JANINO");
> PackageBuilderConfiguration cfg = new PackageBuilderConfiguration();
> JavaDialectConfiguration javaConf = (JavaDialectConfiguration)cfg.getDialectConfiguration("java");
> 
> This version compiles with javac and runs with java -cp . HelloWorldExample but gives me an error within the compiler while compiling the .drl file:
> 
> Exception in thread "main" java.lang.StringIndexOutOfBoundsException: String index out of range: -1
>         at java.lang.String.substring(String.java:1938)
>         at org.drools.base.ClassTypeResolver.importClass(ClassTypeResolver.java:242)
>         at org.drools.base.ClassTypeResolver.resolveType(ClassTypeResolver.java:158)
>         at org.drools.rule.builder.dialect.mvel.MVELDialect.addImport(MVELDialect.java:257)
>         at org.drools.compiler.DialectRegistry.addImport(DialectRegistry.java:98)
>         at org.drools.compiler.PackageBuilder.mergePackage(PackageBuilder.java:377)
>         at org.drools.compiler.PackageBuilder.newPackage(PackageBuilder.java:350)
>         at org.drools.compiler.PackageBuilder.addPackage(PackageBuilder.java:267)
>         at org.drools.compiler.PackageBuilder.addPackageFromDrl(PackageBuilder.java:167)
>         at HelloWorldExample.main(HelloWorldExample.java:39)
> 
> It is dying on this line:
> 
> builder.addPackageFromDrl( source );
> 
> My version of HelloWorldExample.java the same as the given example except for the addition of the lines above for Janino.  My ultimate goal is to run this all under Linux, I am not an Eclipse user.
> 
> Any help getting this working would be greatly appreciated!
> 
> Ron
> 
> 
> 
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