[rules-users] Run Drool Application From Command Prompt

[Pankaj.Jain at lntinfotech.com]

Hi

I still have not got any solution of my problem that I posted previously. 
I have included all required jar files and set proper class path .. Please 
do help ?

problem: 

I am trying to integrate Drool with ofbiz and run application from command 
prompt. In one way I have integrated it properly and I am able to run it 
successfully. 

Code : Which I was using initially 

KnowledgeBuilder kbuilder = KnowledgeBuilderFactory.newKnowledgeBuilder(); 


or 

PackageBuilderConfiguration cfg = new PackageBuilderConfiguration(); 
KnowledgeBuilder kbuilder = KnowledgeBuilderFactory.newKnowledgeBuilder(); 


Exception I got : 

org.drools.RuntimeDroolsException: Unable to load dialect 
'org.drools.rule.builder.dialect.java.JavaDialectConfiguration:java 
:org.drools.rule.builder.dialect.java.JavaDialectConfiguration' 
at 
org.drools.compiler.PackageBuilderConfiguration.addDialect(PackageBuilderConfiguration.java:274) 
at 
org.drools.compiler.PackageBuilderConfiguration.buildDialectConfigurationMap(PackageBuilderConfiguration.java:259) 


at 
org.drools.compiler.PackageBuilderConfiguration.init(PackageBuilderConfiguration.java:176) 
at 
org.drools.compiler.PackageBuilderConfiguration.<init>(PackageBuilderConfiguration.java:153) 
at org.drools.compiler.PackageBuilder.<init>(PackageBuilder.java:242) 
. 
. 
. 
Caused by: java.lang.NullPointerException 
at 
org.drools.rule.builder.dialect.java.JavaDialectConfiguration.setCompiler(JavaDialectConfiguration.java:92) 
at 
org.drools.rule.builder.dialect.java.JavaDialectConfiguration.init(JavaDialectConfiguration.java:55) 
at 
org.drools.compiler.PackageBuilderConfiguration.addDialect(PackageBuilderConfiguration.java:270 


Problem I found : 
In the class JavaDialectConfiguration in jar file drools-compiler.jar 
there is a method named "setCompliler",  in this method Null Pointer 
Exception was coming. 

Solution I provided : 
In my application I created my custom class CustomJavaDialectConfiguration 
by extending to class JavaDialectConfiguration, In this class I overrided 
the method setCompiler. My method was exactly same as that of method 
setCompiler in JavaDialectConfiguration . To call my dialect class I also 
overrided the method "addDialect" of PackageBuilderConfiguration class . 
For that I created class CustomPackageBuilderConfiguration by extending to 
PackageBuilderConfiguration. 
after that I wrote the code: 

PackageBuilderConfiguration cfg = new CustomPackageBuilderConfiguration(); 

KnowledgeBuilder kbuilder = 
KnowledgeBuilderFactory.newKnowledgeBuilder(cfg); 


Now application is running perfectly fine from both eclipse and command 
prompt without any exception. 

I want to know as my overrided method "setCompiler" was exactly same then 
why I had to override method, and In original code (ie in 
drools-compiler.jar file) why it was giving exception  ???  Was that due 
to class lader or something else ??  Please do help in this regard .... 

 

Thanks & Regards:

Pankaj Jain | L&T infotech |Navi Mumbai
Mobile: +91 9920218945
Email : pankaj.jain at lntinfotech.com
www.Lntinfotech.com

"Whatever the mind of man can conceive & believe, it can achieve."

Larsen & Toubro Infotech Ltd.
www.Lntinfotech.com

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