hello, i use drools 5.0 and i have a big problem while i try to write a rule in xml format. my example rule is the follow: --------------------------------------------------------------------------- <rule-set name="cheese rules" xmlns="http://drools.org/rules" xmlns:java="http://drools.org/semantics/java" xmlns:xs="http://www.w3.org/2001/XMLSchema-instance" xs:schemaLocation="http://drools.org/rules rules.xsd http://drools.org/semantics/java java.xsd"> <rule name="Bob Likes Cheese"> <parameter identifier="bob"> <class>org.drools.examples.simple.Bob</class> </parameter> <java:condition>bob.likesCheese() == true</java:condition> <java:consequence> System.out.println( "Bob likes cheese." ); </java:consequence> </rule> </rule-set> ----------------------------------------------------------- and editor (eclipse) show me this error and im unable to run program: [1,0]: [ERR 101] Line 1:0 no viable alternative at input '<' java.lang.IllegalArgumentException: Could not parse knowledge. at com.sample.DroolsTest.readKnowledgeBase(DroolsTest.java:67) at com.sample.DroolsTest.main(DroolsTest.java:24) someone know how to fix it? is this cause eclipse see the '<' as a boolean operator and not as xml opening tag? thanks in advice.