5:51 p.m.
When you run from command prompt, make sure the classloader can find the class definition
of org.drools.rule.builder.dialect.java.JavaDialectConfiguration.
FYI:
RuleBaseConfiguration.java
if ( classLoader != null ) {
this.classLoader = classLoader;
} else if ( Thread.currentThread().getContextClassLoader() != null ) {
this.classLoader = Thread.currentThread().getContextClassLoader();
} else {
this.classLoader = this.getClass().getClassLoader();
}
在2009-07-21，Pankaj.Jain(a)lntinfotech.com 写道：
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(a)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
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07/21/2009 09:42 AM
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Subject
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(a)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(a)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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