FreeMarker Plugin

Support for Apache FreeMarker. Clear the class introspection cache when classes are redefined

Implementation notes

• Plugin initialization is triggered after FreeMarkerServer.init() in servlet classloader
• FreeMarker 2.3.28 has a typo in method ‘clearClassIntrospecitonCache’, used method name as-is
• Any class redefinition triggers the introspection cache to be cleared. events within 500ms are merged

TODO

• Improve performance by only removing the changed classes from the cache. Code snippet:

    Object classIntrospector = ReflectionHelper.get(objectWrapper, "classIntrospector");
    Object cacheClassNames = ReflectionHelper.get(classIntrospector, "cacheClassNames");
    Boolean inCache = (Boolean)ReflectionHelper.invoke(cacheClassNames, cacheClassNames.getClass(), "contains",new Class[] {Object.class}, ctClass.getName());
    if(inCache) {
        ReflectionHelper.invoke(classIntrospector, classIntrospector.getClass(), "remove", new Class[] {Class.class}, appClassLoader.loadClass(ctClass.getName()));
    }