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，[email protected] 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 : [email protected]
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.
"nesta.fdb" <[email protected]>
Sent by: [email protected]
07/21/2009 09:42 AM
Please respond to
Rules Users List <[email protected]>
To
"Rules Users List" <[email protected]>
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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，[email protected] 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 : [email protected]
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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