Re: [rules-users] Running Drools 4 examples
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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