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Apache FreeMarker plugin

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()));
}