[rules-users] Unable to load dialect java from Ant task

[Mark Proctor]

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 at 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 at 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
>>>
>>>
>>>
>>> _______________________________________________
>>> rules-users mailing list
>>> rules-users at lists.jboss.org
>>> https://lists.jboss.org/mailman/listinfo/rules-users
>>>
>>>       
>>
>> -- 
>> Edson Tirelli
>> JBoss Drools Core Development
>> JBoss, a division of Red Hat @ www.jboss.com
>>     
>
>
>       
> _______________________________________________
> rules-users mailing list
> rules-users at lists.jboss.org
> https://lists.jboss.org/mailman/listinfo/rules-users
>
>   

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