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This exception has no message.
java.lang.NullPointerException at java.lang.Class.isAssignableFrom(Native Method) at org.mortbay.jetty.servlet.ServletHolder.doStart( at org.mortbay.component.AbstractLifeCycle.start( at org.mortbay.jetty.servlet.ServletHandler.initialize( at org.mortbay.jetty.servlet.Context.startContext( at org.mortbay.jetty.webapp.WebAppContext.startContext( at org.mortbay.jetty.handler.ContextHandler.doStart(