[rules-users] Is it a limitation in Drools, can not add PKG and ChangeSet in Webapplication

[srinivasasanda]

Hi All,

Please can any one help me, or Say is it a limitation or if Possible how to
do it in web applications.
I had written a peace of code in java that works fine & perfectly in simple
java class,
when i tried to copy same piece of code into servlet program and run, then
it throws an error, 
even i included same jar files to both the applications --> drool5.2 jars
when tried to uncomment  the commented line and run then it throws error, (
in adding the package, and changeSet) 


KnowledgeAgent ka = KnowledgeAgentFactory.newKnowledgeAgent("MyAgent");
KnowledgeBuilder _kbuilder = KnowledgeBuilderFactory.newKnowledgeBuilder();
KnowledgeBase _kbase = KnowledgeBaseFactory.newKnowledgeBase();
    String
urlString="http://localhost:8080/guvnor-5.2.0.Final-jboss-as-5.1/rest/packages/sample/source";
  //String urlString =
"http://localhost:8080/guvnor-5.2.0.Final-jboss-as-5.1/org.drools.guvnor.Guvnor/package/sample/LATEST";
//String
urlString="http://localhost:8080/guvnor-5.2.0.Final-jboss-as-5.1/org.drools.guvnor.Guvnor/package/sample/LATEST/ChangeSet.xml"

	        URL url = new URL(urlString);
	        UrlResource urlResource =
(UrlResource)ResourceFactory.newUrlResource(url);
	        urlResource.setBasicAuthentication("enabled");
	        urlResource.setUsername("admin");
	        urlResource.setPassword("admin");
	        System.out.print("\n\n\n\n before adding package Sasi Sasi ");
	       
_kbuilder.add(ResourceFactory.newUrlResource(url),ResourceType.DRL);
	       
//_kbuilder.add(ResourceFactory.newUrlResource(url),ResourceType.PKG);
	        _kbase.addKnowledgePackages(_kbuilder.getKnowledgePackages());
	        System.out.print("\n\n\n\n added package Sasi Sasi");
	       
// ka.applyChangeSet(urlResource);
	        /*KnowledgeBase kb = ka.getKnowledgeBase();
	 */       
     FactType appType = _kbase.getFactType("sample", "person");
     Object application = appType.newInstance();
     appType.set(application, "age", 25);
     appType.set(application, "income", 1500);
     appType.set(application, "result", "");
 StatelessKnowledgeSession ks = _kbase.newStatelessKnowledgeSession();
 ks.execute(application);
 System.out.println(application);
 System.out.println("Result is "+appType.get(application, "result"));
	


if add resource type other than the DRL, like PKG,CHANGE_SET then it throws
error specified error
root cause

java.lang.NoSuchFieldError: DESCR

org.drools.compiler.PackageBuilder.addKnowledgeResource(PackageBuilder.java:539)

org.drools.builder.impl.KnowledgeBuilderImpl.add(KnowledgeBuilderImpl.java:28)
	RuleEngine.doGet(RuleEngine.java:85)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:617)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:717)

org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96)




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