Hi, 
i have this exception every time i'm used drools 5.2 final wiht jdk 1.6, eclipse 3.4. I configured correctly the classpath.

java.lang.RuntimeException: org.drools.compiler.DroolsParserException: java.lang.IllegalArgumentException: Unable to instantiate service for Class 'org.drools.compiler.BusinessRuleProvider'
at org.drools.compiler.PackageBuilder.addKnowledgeResource(PackageBuilder.java:638)
at org.drools.builder.impl.KnowledgeBuilderImpl.add(KnowledgeBuilderImpl.java:28) 
 anybody can help !!
tk's in advance