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java.lang.IllegalStateException: Detected both log4j-over-slf4j.jar AND bound slf4j-log4j12.jar on the class path, preempting StackOverflowError. See also http://www.slf4j.org/codes.html#log4jDelegationLoop for more details.	at org.slf4j.impl.Log4jLoggerFactory.(Log4jLoggerFactory.java:54)	at org.slf4j.impl.StaticLoggerBinder.(StaticLoggerBinder.java:72)	at org.slf4j.impl.StaticLoggerBinder.(StaticLoggerBinder.java:45)	at org.slf4j.LoggerFactory.bind(LoggerFactory.java:150)	at org.slf4j.LoggerFactory.performInitialization(LoggerFactory.java:124)	at org.slf4j.LoggerFactory.getILoggerFactory(LoggerFactory.java:412)	at org.slf4j.LoggerFactory.getLogger(LoggerFactory.java:357)	at org.slf4j.LoggerFactory.getLogger(LoggerFactory.java:383)	at sso.HomePageServlet.(HomePageServlet.java:23)	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)	at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)	at java.lang.reflect.Constructor.newInstance(Constructor.java:422)	at java.lang.Class.newInstance(Class.java:442)	at org.mortbay.jetty.servlet.Holder.newInstance(Holder.java:153)	at org.mortbay.jetty.servlet.ServletHolder.initServlet(ServletHolder.java:428)	at org.mortbay.jetty.servlet.ServletHolder.getServlet(ServletHolder.java:339)	at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:487)	at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:390)	at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)	at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:182)	at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:765)	at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:440)	at org.mortbay.jetty.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:230)	at org.mortbay.jetty.handler.HandlerCollection.handle(HandlerCollection.java:114)	at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)	at org.mortbay.jetty.Server.handle(Server.java:326)	at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:542)	at org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:926)	at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:549)	at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:212)	at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404)	at org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:410)	at org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.java:582)