[rules-users] Problem : Run Drool Application From Command Prompt

[Pankaj.Jain at lntinfotech.com]

Hi

I Have put all the required jar files including eclipse's 
core-3.4.2.v_883_R34x.jar.  Without overriding the "setCompiler" method 
code runs perfectly from eclipse but gives exception when try to run from 
command prompt

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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Internal Use Only   L&T Infotech General Business 

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"nesta.fdb" <nesta.fdb at 163.com> 
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07/21/2009 09:42 AM
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Re: [rules-users] Problem : Run Drool Application From Command Prompt






I think that you need to put java compiler to your classpath.
try eclipse's core-3.4.2.v_883_R34x.jar.


在2009-07-21，Pankaj.Jain at lntinfotech.com 写道：

Hi 

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

This Document is classified as: 

L&T Infotech Proprietary   L&T Infotech Confidential   L&T Infotech 
Internal Use Only   L&T Infotech General Business 

This Email may contain confidential or privileged information for the 
intended recipient (s) If you are not the intended recipient, please do 
not use or disseminate the information, notify the sender and delete it 
from your system. 
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