From: Pankaj.Jain(a)lntinfotech.com <Pankaj.Jain(a)lntinfotech.com&gt; Subject: Re: [rules-users] Run Drool Application From Command Prompt To: "Rules Users List" <rules-users(a)lists.jboss.org&gt; Date: Tuesday, July 28, 2009, 1:23 AM Hi you r right, When I run the application (integrated with OFBiz) from command prompt  I get the NPE: in line getClass().getClassLoader().loadClass( "org.eclipse.jdt.internal.compiler.Compiler" ); When I run the application (ofcourse integrated with OFBiz)  from eclipse I don't get NPE exception. In ofbiz we have a batch file named startofbiz.bat to run the application, inside this I configured the classpath by this set VMARGS=-Xbootclasspath/p:applications\order\lib\antlr-runtime.jar set VMARGS=-Xbootclasspath/p:applications\order\lib\drools-api.jar %VMARGS% set VMARGS=-Xbootclasspath/p:applications\order\lib\drools-compiler.jar %VMARGS% set VMARGS=-Xbootclasspath/p:applications\order\lib\drools-core.jar %VMARGS% set VMARGS=-Xbootclasspath/p:applications\order\lib\drools-decisiontables.jar %VMARGS% set VMARGS=-Xbootclasspath/p:applications\order\lib\drools-jsr94.jar %VMARGS% set VMARGS=-Xbootclasspath/p:applications\order\lib\drools-templates.jar %VMARGS% set VMARGS=-Xbootclasspath/p:applications\order\lib\joda-time.jar %VMARGS% set VMARGS=-Xbootclasspath/p:applications\order\lib\jsr94.jar %VMARGS% set VMARGS=-Xbootclasspath/p:applications\order\lib\jxl.jar %VMARGS% set VMARGS=-Xbootclasspath/p:applications\order\lib\mvel2.jar %VMARGS% set VMARGS=-Xbootclasspath/p:applications\order\lib\org.eclipse.jdt.core_3.4.4.v_894_R34x.jar %VMARGS% set VMARGS=-Xbootclasspath/p:applications\order\lib\xpp3.jar %VMARGS% set VMARGS=-Xbootclasspath/p:applications\order\lib\xpp3_min.jar %VMARGS% set VMARGS=-Xbootclasspath/p:applications\order\lib\xstream.jar %VMARGS% If i don't do this I get the class not found exception 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. Greg Barton <greg_barton(a)yahoo.com&gt; Sent by: rules-users-bounces(a)lists.jboss.org 07/28/2009 11:29 AM Please respond to Rules Users List <rules-users(a)lists.jboss.org&gt; To Rules Users List <rules-users(a)lists.jboss.org&gt; cc Subject Re: [rules-users] Run Drool Application >From Command Prompt It's unclear from your post when you get the NPE: from the command line, from eclipse, or when integrated with OFBiz. (I assume you're referring to http://ofbiz.apache.org/) It's undoubtedly a classpath issue.  Just peek at the source a bit.  I'm not sure what version you're using, but if you look at the source in the svn repo you'll see that line 92 of JavaDialectConfiguration is this: getClass().getClassLoader().loadClass( "org.eclipse.jdt.internal.compiler.Compiler" ); See the javadoc for Class.getClassLoader() that says "Returns the class loader for the class. Some implementations may use null to represent the bootstrap class loader. This method will return null in such implementations if this class was loaded by the bootstrap class loader." So, it looks probable that in the environment that's having problems, the JavaDialectConfiguration class is loaded by the bootstrap classloader.  What is the VM implementation you're using? It might be best if Thread.currentThread().getContextClassLoader() was used instead of getClass().getClassLoader() in JavaDialectConfiguration and elsewhere.  Devs, have an opinion on that? --- On Mon, 7/27/09, Pankaj.Jain(a)lntinfotech.com <Pankaj.Jain(a)lntinfotech.com&gt; wrote: > From: Pankaj.Jain(a)lntinfotech.com <Pankaj.Jain(a)lntinfotech.com&gt; > Subject: Re: [rules-users] Run Drool Application From Command Prompt > To: rules-users(a)lists.jboss.org > Date: Monday, July 27, 2009, 11:50 PM > > > 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(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. > > > > ______________________________________________________________________ > > > -----Inline Attachment Follows----- > > _______________________________________________ > rules-users mailing list > rules-users(a)lists.jboss.org > https://lists.jboss.org/mailman/listinfo/rules-users >       _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users ______________________________________________________________________ ______________________________________________________________________ -----Inline Attachment Follows----- _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users