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How to make ops4j logging work with logback?

I am working in ServiceMix 4.3.0 (using OPS4j 1.5.3 to provide slf4j). I am trying to make logback library working with ops4j but it looks like logback is not able to work with slf4j (proveded by ops4j) .I installed Logback Core Module (0.9.20), Logback Classic Module (0.9.20), jcl-over-slf4j (1.5.11) in order to make slf4j and logback working together. The installation was fine, no error. In my application, i have a code snippet to read logback.xml from external folder.

fis = new FileInputStream(System.getProperty("./logconf") + "/logback.xml");
LoggerContext lc = (LoggerContext) LoggerFactory.getILoggerFactory();
JoranConfigurator configurator = new JoranConfigurator();
configurator.setContext(lc);
lc.reset();
configurator.doConfigure(fis);

I always get this error when above code is executed  

java.lang.ClassCastException: org.ops4j.pax.logging.slf4j.Slf4jLoggerFactory cannot be cast to ch.qos.logback.classic.LoggerContext.