java.lang.LinkageError: loader constraint violation

I am getting following exception while deploying application on jetty server using maven.(mvn -o jetty:run -u)

java.lang.LinkageError: loader constraint violation: loader (instance of org/mortbay/jetty/webapp/WebAppClassLoader) previously initiated loading for a different type with name "javax/management/MBeanServer"

How to resolve this.?
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that means two classes of the same name are loaded inconsistently.

great explanation of it here
ManishLeadAuthor Commented:
Sorry I am not able to open above link.
Some imp part can you paste?
typically same class being loaded by different classloaders

check the jars that are part of your war are not already supplied by jetty

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Check if you have a jmx.jar within your application as well as in Jetty. Remove yours and test...
ManishLeadAuthor Commented:
No, I didnt find jmx jar in our application.
ManishLeadAuthor Commented:
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