java.lang.LinkageError loader constraint violation ELResover

java.lang.LinkageError due to constraint violation loader will prevent the server startup and will throw Exception sending context destroyed event to listener instance of class org.apache.myfaces.webapp.StartupServletContextListener and says "SEVERE: Error listenerStart"

In detail you might see following error in your console:

Oct 8, 2013 11:24:36 AM org.apache.catalina.core.StandardContext start
SEVERE: Error listenerStart
Oct 8, 2013 11:24:36 AM org.apache.catalina.core.StandardContext start
SEVERE: Context [/ACTS] startup failed due to previous errors
Oct 8, 2013 11:24:36 AM org.apache.catalina.core.ApplicationContext log
INFO: Closing Spring root WebApplicationContext
Oct 8, 2013 11:24:36 AM org.apache.catalina.core.ApplicationContext log
INFO: Shutting down log4j
Oct 8, 2013 11:24:36 AM org.apache.catalina.core.StandardContext listenerStop
SEVERE: Exception sending context destroyed event to listener instance of class org.apache.myfaces.webapp.StartupServletContextListener
java.lang.LinkageError: loader constraint violation: loader (instance of org/apache/catalina/loader/WebappClassLoader) previously initiated loading for a different type with name "javax/el/ExpressionFactory"
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClassCond(ClassLoader.java:631)
at java.lang.ClassLoader.defineClass(ClassLoader.java:615)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:141)
at org.apache.catalina.loader.WebappClassLoader.findClassInternal(WebappClassLoader.java:1847)
at org.apache.catalina.loader.WebappClassLoader.findClass(WebappClassLoader.java:890)
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1354)
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1233)
at java.lang.Class.getDeclaredMethods0(Native Method)
at java.lang.Class.privateGetDeclaredMethods(Class.java:2427)
at java.lang.Class.getDeclaredMethods(Class.java:1791)
at org.apache.myfaces.config.annotation.NoInjectionAnnotationLifecycleProvider.destroyInstance(NoInjectionAnnotationLifecycleProvider.java:94)
at org.apache.myfaces.webapp.AbstractMyFacesListener.doPreDestroy(AbstractMyFacesListener.java:61)
at org.apache.myfaces.webapp.StartupServletContextListener.doPredestroy(StartupServletContextListener.java:213)
at org.apache.myfaces.webapp.StartupServletContextListener.contextDestroyed(StartupServletContextListener.java:190)
at org.apache.catalina.core.StandardContext.listenerStop(StandardContext.java:3882)
at org.apache.catalina.core.StandardContext.stop(StandardContext.java:4523)
at org.apache.catalina.core.StandardContext.start(StandardContext.java:4387)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1045)
at org.apache.catalina.core.StandardHost.start(StandardHost.java:719)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1045)
at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:443)
at org.apache.catalina.core.StandardService.start(StandardService.java:516)
at org.apache.catalina.core.StandardServer.start(StandardServer.java:710)
at org.apache.catalina.startup.Catalina.start(Catalina.java:578)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:288)
at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:413)
Oct 8, 2013 11:24:37 AM org.apache.coyote.http11.Http11Protocol start

This error is mainly due to the ELResolver has multiple interfaces and hence the conflict.

If your using eclipse, try to search for ELResolver class by using Open Type (Ctrl + Shift + t) and check those are declared in your POM file with scope "provided"
Mostly if you see any jar file having ELResolver which is not used in any POM file, remove them or try hard refresh your project

Hope that solves the problem.

If you find any other ways to solve the problem, please post in the comments, so atleast that helps others.