javax.servlet.ServletException: This exception has no message.

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javax.servlet.ServletException:
at sun.reflect.generics.reflectiveObjects.ParameterizedTypeImpl.validateConstructorArguments(ParameterizedTypeImpl.java:72)
at sun.reflect.generics.reflectiveObjects.ParameterizedTypeImpl.(ParameterizedTypeImpl.java:65)
at sun.reflect.generics.reflectiveObjects.ParameterizedTypeImpl.make(ParameterizedTypeImpl.java:107)
at sun.reflect.generics.factory.CoreReflectionFactory.makeParameterizedType(CoreReflectionFactory.java:117)
at sun.reflect.generics.visitor.Reifier.visitClassTypeSignature(Reifier.java:152)
at sun.reflect.generics.tree.ClassTypeSignature.accept(ClassTypeSignature.java:61)
at sun.reflect.generics.repository.MethodRepository.getReturnType(MethodRepository.java:80)
at java.lang.reflect.Method.getGenericReturnType(Method.java:256)
at java.beans.FeatureDescriptor.getReturnType(FeatureDescriptor.java:381)
at java.beans.Introspector.getTargetEventInfo(Introspector.java:965)
at java.beans.Introspector.getBeanInfo(Introspector.java:426)
at java.beans.Introspector.getBeanInfo(Introspector.java:172)
at javax.el.BeanELResolver$BeanProperties.(BeanELResolver.java:218)
at javax.el.BeanELResolver.property(BeanELResolver.java:315)
at javax.el.BeanELResolver.getValue(BeanELResolver.java:89)
at javax.el.CompositeELResolver.getValue(CompositeELResolver.java:55)
at com.sun.faces.el.FacesCompositeELResolver.getValue(FacesCompositeELResolver.java:73)
at org.apache.el.parser.AstValue.getValue(AstValue.java:174)

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