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The Commons Jexl library is an implementation of the JSTL Expression Language with extensions.

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        Package Documentation for org.apache.commons.jexl2.introspection Package
    
    
        Provides low-level introspective services.
        
            This internal package is not intended for public usage and there is no
            guarantee that its public classes or methods will remain as is in subsequent
            versions.
        
        
            The IntrospectorBase, ClassMap, MethodKey, MethodMap form the
            base of the introspection service. They allow to describe classes and their
            methods, keeping them in a cache (@see IntrospectorBase) to speed up property
            getters/setters and method discovery used during expression evaluation.
        
        
            The cache materialized in Introspector creates one entry per class containing a map of all
            accessible public methods keyed by name and signature.