java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException: 	at java.lang.Class.isAssignableFrom(Native Method)	at org.mortbay.jetty.servlet.ServletHolder.doStart(ServletHolder.java:256)	at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:50)	at org.mortbay.jetty.servlet.ServletHandler.initialize(ServletHandler.java:685)	at org.mortbay.jetty.servlet.Context.startContext(Context.java:140)	at org.mortbay.jetty.webapp.WebAppContext.startContext(WebAppContext.java:1250)	at org.mortbay.jetty.handler.ContextHandler.doStart(ContextHandler.java:517)	at org.mortbay.jetty.webapp.WebAppContext.doStart(WebAppContext.java:467)	at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:50)	at org.mortbay.jetty.handler.HandlerWrapper.doStart(HandlerWrapper.java:130)	at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:50)	at org.mortbay.jetty.handler.HandlerWrapper.doStart(HandlerWrapper.java:130)	at org.mortbay.jetty.Server.doStart(Server.java:224)	at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:50)