Hello, I faced with the same problem. Breakpoints are not being hit by debugger. I have Eclipse SDK version: 4.2.1 and went through the reference manual of Drools and followed each step carefully. -Installed GEF - Downloaded drools-distribution-5.4.0.Final.zip -Unzipped it into Eclipse main folder -Restarted Eclipse -Defined run time based on the latest Drools project jars included in the plugin itself. -Created Drools Project -Created new launch configuration for Drools Application. -Put a breakpoint in the helloworld simple project on the first line of the section "then". When I debug it as Drools Application, debugger stops in Java breakpoints but doesn't stop in drl rule. Any solutions, how can I fix it? Thanks in advance. -- View this message in context: http://drools.46999.n3.nabble.com/Eclipse-Debugging-Drl-file-tp3870257p40... Sent from the Drools: User forum mailing list archive at Nabble.com.