Thanks Ceki for your input...unfortunately It didn't work for me. Jars added in lib for logback:- - groovy-all-1.6.5 - logback-core-0.9.24 - logback-classic-0.9.24 - slf4j-api-1.6.0 As suggested by you, replaced logback-classic with "slf4j-nop-1.3.0", then I got an error saying SLF4J: slf4j-api 1.6.x (or later) is incompatible with this binding. SLF4J: Your binding is version 1.5.5 or earlier. SLF4J: Upgrade your binding to version 1.6.x. or 2.0.x java.lang.NoSuchMethodError: org.slf4j.impl.StaticLoggerBinder.getSingleton()Lor g/slf4j/impl/StaticLoggerBinder; at org.slf4j.LoggerFactory.bind(LoggerFactory.java:121) at org.slf4j.LoggerFactory.performInitialization(LoggerFactory.java:111) at org.slf4j.LoggerFactory.getILoggerFactory(LoggerFactory.java:268) at org.slf4j.LoggerFactory.getLogger(LoggerFactory.java:241) at org.slf4j.LoggerFactory.getLogger(LoggerFactory.java:254) So I replaced slf4j-api-1.6.0 with lower version(i.e. slf4j-api-1.5.5), error gone but no logging in my system! Interestingly, no errors, no warnings and no logging though I jars and groovy file is in the classpath. Did I do anything wrong? - Any light on this ~Nikhil