java - Apache Mina Exception -

i have followed link example program using apache mina.

these lib files used code.

1. mina-core-2.0.7.jar
2. slf4j-api-1.7.5.jar
3. slf4j-jdk14-1.7.5.jar

i getting following error:

exception in thread "main" java.lang.classcastexception: org.slf4j.impl.jdk14loggeradapter cannot cast java.util.logging.logger     @ minafiletrans.minaserverhandler.<init>(minaserverhandler.java:12)     @ minafiletrans.minafiletrans.main(minafiletrans.java:23) java result: 1 

here code:

    package minafiletrans;  import java.util.logging.logger; import org.apache.mina.core.service.iohandleradapter; import org.apache.mina.core.session.idlestatus; import org.apache.mina.core.session.iosession; import org.slf4j.loggerfactory;  public class minaserverhandler extends iohandleradapter  {     @suppresswarnings("nonconstantlogger")     private final logger logger = (logger) loggerfactory.getlogger(getclass()); @override public void sessionopened(iosession session) { // set idle time 10 seconds session.getconfig().setidletime(idlestatus.both_idle, 10); session.setattribute("values: "); } @override     @suppresswarnings("loggerstringconcat") public void messagereceived(iosession session, object message) { logger.info("message received in server.."); logger.info("message is: " + message.tostring()); } @override public void sessionidle(iosession session, idlestatus status) { logger.info("disconnecting idle."); // disconnect idle client session.close(true); } @override public void exceptioncaught(iosession session, throwable cause) { // close connection on exceptional situation session.close(true); }  } 

i have added required lib files. why error occurs me. suggestions solve error.

you should not : import java.util.logging.logger; import org.slf4j.logger;