Hello, I am trying of integrate Drools Guvnor with an java web application. I am using KnowledgeAgent, but occurs the next exception when execute the code: java.lang.RuntimeException: java.io.IOException: Server returned HTTP response code: 401 for URL: http://localhost:8383/drools-guvnor/org.drools.guvnor.Guvnor/package/org.... at org.drools.compiler.PackageBuilder.addKnowledgeResource(PackageBuilder.java:559) at org.drools.builder.impl.KnowledgeBuilderImpl.add(KnowledgeBuilderImpl.java:25) at org.examples.test.TestKnowledgeAgent.getKnowledgeBase(TestKnowledgeAgent.java:63) at org.examples.test.TestKnowledgeAgent.main(TestKnowledgeAgent.java:28) Caused by: java.io.IOException: Server returned HTTP response code: 401 for URL: http://localhost:8383/drools-guvnor/org.drools.guvnor.Guvnor/package/org.... at sun.net.www.protocol.http.HttpURLConnection.getInputStream(Unknown Source) at org.drools.io.impl.UrlResource.getInputStream(UrlResource.java:76) at org.drools.compiler.PackageBuilder.addKnowledgeResource(PackageBuilder.java:512) ... 3 more Exception in thread "main" java.lang.NullPointerException at org.examples.test.TestKnowledgeAgent.main(TestKnowledgeAgent.java:37) What is the cause of this exception? How can I solved it? Any help is welcome. Regards, -- View this message in context: http://drools-java-rules-engine.46999.n3.nabble.com/Use-Knowledge-Agent-t... Sent from the Drools - Dev mailing list archive at Nabble.com.