the only Eclipe jar drools depends on is Eclipse JDT Compiler, which is available separately and is up on ibiblio.

Justin Case wrote:

Thanks a lot for the answer. The problem is exactly that one: how could I know what the dependencies for the DRools compiler are?! I thought this list would know :)) Anyway, I'll print out the Eclipse runtime classpath and compare them two to see what stands out. 

The Ant task is mentioned here and there in the documentation (albeit without examples) so I kinda thought more people are using it. An older thread of this same list talks about adding (only) the drools-ant to the classpath, which of course solves the ant task itself but none of its dependencies... I find it difficult to believe that the compiler depends on some Eclipse stuff, especially after I added ALL the jars existing in the Eclipse configuration. The only thing I cannot directly rule out is the classloader issue, but that's also the only thing I have no idea how to debug/solve :(

Thank you,
M

--- On Sun, 9/21/08, Edson Tirelli <tirelli@post.com> wrote:

This is always related to classpath problems. Make sure you have all
dependencies set in your classpath and if that does not work, maybe 
make an> example project with the error available somewhere that
another person can take a look at it. (don't think you can send zip
attachements to the list, but not sure).

   Eclipse-plugin embeds a series of dependency jars that are 
transparently added to the classpath. That is the major reason you may
see the problem outside of eclipse, but not inside. Classloader
configuration is also another reason.

   []s
   Edson

2008/9/18 Soterro <send_lotsa_spam_here@yahoo.com>

Hi all,

I have a perfectly running Eclipse 3.3 with DRools

4.0.4 and JDK 1.5.14.

The rules are compiled with a post build Ant task

which uses Janino (need

it for Tomcat compatibility).
Now OUTSIDE Eclipse it seems I cannot use that Ant

task to save my life :(

I tried switching from Janino to the default compiler,

same thing. I always

get this infamous error:

 BUILD FAILED
 E:\buildRules-hudson.xml:30: RuleBaseTask failed:

Unable to load dialect

'org.drools.rule.builder.dialect.java.JavaDialectConfiguration:java'

at

com.csc.ezbook.eztarif.rules.DroolsCompilerAntTaskStandalone.execute

       (DroolsCompilerAntTaskStandalone.java:163)
       at

org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:288)

at

sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

at

sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.

       java:39)
       at

sun.reflect.DelegatingMethodAccessorImpl.invoke(

       DelegatingMethodAccessorImpl.java:25)
       at

java.lang.reflect.Method.invoke(Method.java:585)

at

org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java

       :105)
       at

org.apache.tools.ant.Task.perform(Task.java:348)

 [...]
 Caused by: org.drools.RuntimeDroolsException: Unable

to load dialect

'org.drools.rule.builder.dialect.java.JavaDialectConfiguration:java'

at

org.drools.compiler.PackageBuilderConfiguration.addDialect(

       PackageBuilderConfiguration.java:152)
       at

org.drools.compiler.PackageBuilderConfiguration.

      
      

buildDialectConfigurationMap(PackageBuilderConfiguration.java:140)

at

org.drools.compiler.PackageBuilderConfiguration.init(

       PackageBuilderConfiguration.java:117)
       at

org.drools.compiler.PackageBuilderConfiguration.<init>(

       PackageBuilderConfiguration.java:94)
       at

com.my.app.rules.DroolsCompilerAntTaskStandalone.getPackageBuilder(

       DroolsCompilerAntTaskStandalone.java:257)
       at

com.my.app.rules.DroolsCompilerAntTaskStandalone.execute(

       DroolsCompilerAntTaskStandalone.java:136)

That "DroolsCompilerAntTaskStandalone" is my

task using the default

compiler like this:
   PackageBuilderConfiguration conf = new

PackageBuilderConfiguration();

   conf.setClassLoader( loader );
   PackageBuilder builder = new PackageBuilder( conf

);

If I use Janino like below the error is exactly the

same...

   PackageBuilderConfiguration pkgBuilderCfg = new
   PackageBuilderConfiguration();
   pkgBuilderCfg.setClassLoader( loader );
   JavaDialectConfiguration javaConf =

(JavaDialectConfiguration)

   pkgBuilderCfg.getDialectConfiguration(

"java" );

   javaConf.setCompiler(

JavaDialectConfiguration.JANINO );

   PackageBuilder builder = new PackageBuilder(

pkgBuilderCfg );

Again, in Eclipse all is working fine. I checked

Ant's classpath, here it

is:

E:\apache-ant-1.7.0\bin\..\lib\ant-launcher.jar

 E:\apache-ant-1.7.0\lib\*.jar
 C:\Program

Files\Java\jdk1.5.0_14\lib\tools.jar

Here is how I provide a classpath:
       <taskdef name="rulescompiler"

classname="com.my.app.rules.

       DroolsCompilerAntTaskStandalone"
classpathref="droolsutils.classpath" />

       <target depends="newfilesarethere"

name="build"

unless="rulesCompile.
       notRequired">
               <rulescompiler

srcdir="${THIS_PROJ}/src/com/my/app/rules"

      

tofile="${THIS_PROJ}/build/classes/com/my/app/rules/

                              packaged.rules"

classpathref="droolsutils.classpath" >

                   <include name="*.drl"

/>

               </rulescompiler>
       </target>

The classpath I provide contains pretty much all

libraries I use normally

in the project, but I tried even to add ALL jar's

from the Eclipse 3.3

install directory (that would include all DRools 4.0.4

libraries, with antlr

and whatnot)

I tried also with DRools 4.0.7, same behaviour...

What does that mean and where is it coming from? Could

it have issues with

the tools.jar from Java 1.5.0_14?

Thank you for any input,
M



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-- 
Edson Tirelli
JBoss Drools Core Development
JBoss, a division of Red Hat @ www.jboss.com



      
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