*Hi I am trying to learn drools. Please help me with this problem. I am using the HelloWorldExample from drools5.0 examples. I have converted the HelloWorld.drl to HelloWorld.xml using the XmlDumper class as follows: * final Reader source = new InputStreamReader( HelloWorldExample.class.getResourceAsStream( "HelloWorld.drl" ) ); Reader source = new InputStreamReader(fis ); final DrlParser drlp= new DrlParser(); final PackageDescr astx = drlp.parse(source); String hope = new String(); XmlDumper xmldumper = new XmlDumper(); hope = xmldumper.dump(astx); System.out.print(hope); try { FileWriter fw = new FileWriter(new File("d://HelloWorld.xml")); fw.write(hope); fw.flush(); fw.close(); } catch (IOException e){ } *Then i am trying to load it as follows: * final KnowledgeBuilder kbuilder = KnowledgeBuilderFactory .newKnowledgeBuilder(); // this will parse and compile in one step kbuilder.add(ResourceFactory.newClassPathResource("HelloWorld.xml", HelloWorldExample.class), ResourceType.XDRL); // Check the builder for errors if (kbuilder.hasErrors()) { System.out.println(kbuilder.getErrors().toString()); throw new RuntimeException("Unable to compile \"HelloWorld.drl\"."); } // get the compiled packages (which are serializable) final Collection<KnowledgePackage> pkgs = kbuilder .getKnowledgePackages(); // add the packages to a knowledgebase (deploy the knowledge packages). final KnowledgeBase kbase = KnowledgeBaseFactory.newKnowledgeBase(); kbase.addKnowledgePackages(pkgs); *When i try to run this example, i am getting the error* null: 5, 77): schema_reference.4: Failed to read schema document ' drools.org/drools-5.0.xsd';, because 1) could not find the document; 2) the document could not be read; 3) the root element of the document is not <xsd:schema>. (null: 5, 77): cvc-elt.1: Cannot find the declaration of element 'package'. (null: 6, 64): schema_reference.4: Failed to read schema document ' drools.org/drools-5.0.xsd';, because 1) could not find the document; 2) the document could not be read; 3) the root element of the document is not <xsd:schema>. (null: 8, 51): schema_reference.4: Failed to read schema document ' drools.org/drools-5.0.xsd';, because 1) could not find the document; 2) the document could not be read; 3) the root element of the document is not <xsd:schema>. (null: 12, 26): schema_reference.4: Failed to read schema document ' drools.org/drools-5.0.xsd';, because 1) could not find the document; 2) the document could not be read; 3) the root element of the document is not <xsd:schema>. (null: 13, 47): schema_reference.4: Failed to read schema document ' drools.org/drools-5.0.xsd';, because 1) could not find the document; 2) the document could not be read; 3) the root element of the document is not <xsd:schema>. (null: 15, 6): schema_reference.4: Failed to read schema document ' drools.org/drools-5.0.xsd';, because 1) could not find the document; 2) the document could not be read; 3) the root element of the document is not <xsd:schema>. (null: 15, 53): schema_reference.4: Failed to read schema document ' drools.org/drools-5.0.xsd';, because 1) could not find the document; 2) the document could not be read; 3) the root element of the document is not <xsd:schema>. (null: 16, 39): schema_reference.4: Failed to read schema document ' drools.org/drools-5.0.xsd';, because 1) could not find the document; 2) the document could not be read; 3) the root element of the document is not <xsd:schema>. (null: 17, 50): schema_reference.4: Failed to read schema document ' drools.org/drools-5.0.xsd';, because 1) could not find the document; 2) the document could not be read; 3) the root element of the document is not <xsd:schema>. (null: 20, 60): schema_reference.4: Failed to read schema document ' drools.org/drools-5.0.xsd';, because 1) could not find the document; 2) the document could not be read; 3) the root element of the document is not <xsd:schema>. (null: 27, 12): schema_reference.4: Failed to read schema document ' drools.org/drools-5.0.xsd';, because 1) could not find the document; 2) the document could not be read; 3) the root element of the document is not <xsd:schema>. (null: 31, 30): schema_reference.4: Failed to read schema document ' drools.org/drools-5.0.xsd';, because 1) could not find the document; 2) the document could not be read; 3) the root element of the document is not <xsd:schema>. (null: 32, 47): schema_reference.4: Failed to read schema document ' drools.org/drools-5.0.xsd';, because 1) could not find the document; 2) the document could not be read; 3) the root element of the document is not <xsd:schema>. (null: 34, 6): schema_reference.4: Failed to read schema document ' drools.org/drools-5.0.xsd';, because 1) could not find the document; 2) the document could not be read; 3) the root element of the document is not <xsd:schema>. (null: 34, 38): schema_reference.4: Failed to read schema document ' drools.org/drools-5.0.xsd';, because 1) could not find the document; 2) the document could not be read; 3) the root element of the document is not <xsd:schema>. (null: 35, 39): schema_reference.4: Failed to read schema document ' drools.org/drools-5.0.xsd';, because 1) could not find the document; 2) the document could not be read; 3) the root element of the document is not <xsd:schema>. (null: 36, 50): schema_reference.4: Failed to read schema document ' drools.org/drools-5.0.xsd';, because 1) could not find the document; 2) the document could not be read; 3) the root element of the document is not <xsd:schema>. (null: 39, 60): schema_reference.4: Failed to read schema document ' drools.org/drools-5.0.xsd';, because 1) could not find the document; 2) the document could not be read; 3) the root element of the document is not <xsd:schema>. (null: 46, 12): schema_reference.4: Failed to read schema document ' drools.org/drools-5.0.xsd';, because 1) could not find the document; 2) the document could not be read; 3) the root element of the document is not <xsd:schema>. Unable to create a Field value of type 'ValueType = 'int'' and value 'Message.HELLO ' : [Rule name='Hello World'] java.lang.NoSuchFieldException: HELLO Unable to create restriction '[QualifiedIndentifierRestr: == Message.HELLO ]' for field 'status' in the rule 'Hello World' : [Rule name='Hello World'] Unable to create a Field value of type 'ValueType = 'int'' and value 'Message.GOODBYE ' : [Rule name='Good Bye'] java.lang.NoSuchFieldException: GOODBYE Unable to create restriction '[QualifiedIndentifierRestr: == Message.GOODBYE ]' for field 'status' in the rule 'Good Bye' : [Rule name='Good Bye'] Exception in thread "main" java.lang.RuntimeException: Unable to compile "HelloWorld.drl". at org.drools.examples.HelloWorldExample.main(HelloWorldExample.java:36) *I have included the drools5.0 runtime in the classpath of the project and workspace. Am i missing something? Is it the right way to load the rules in xml format to KnowledgeBuilder? Is there an alternate way? Please HELP! thanks Abarna*