[rules-users] How to set JANINO compiler with Drools5 M5

Hi. I'm kind of new to Drools5.0. Could I ask you guys how to set JANINO compiler with recent API? I just run the sample drl with EclipseIDE, which is download from drools site, and then the error occured- The Eclipse JDT Core jar is not in the classpath. So, I just want to know why this happens and how to set another compiler to retry. Thanks in advance. waki