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Re: WebObjects classloader fun.

Does anyone know much about how webobjects uses the classloader and how the _NSUtilities class cache is initialized and used?

[snip] it appears that _NSUtilities has a static initialiser that pulls in and caches classes rather than asking the current thread context classloader for them when needed [snip]
You are correct ... Frameworks (and your app) are loaded by NSBundle, which traverses all of the classpath and loads the reachable classes into the NSUtilities cache (so you can do things like looking up a component by name -- _NSUtilities.classWithName(..)). You can also override these class names by calling _NSUtilities.setClassForName. If the name was not in the cache, it will Class.forName it and then put the result into the cache. This behavior makes packageless WOComponent name lookups (for instance) very fast in exchange for some kind of weird behavior (like cross-your-fingers-if-you-have-two- classes-with-the-same-name).

Unfortunately, I don't know of any way to REMOVE an entry from the cache. You can't setClassForName(null, "ClassName") because that tries to put a null key into the cache. If you specifically know the class name, you can replace it yourself -- ERXPatcher is generally just calling setClassForName with classes it replaces.

ms

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 >WebObjects classloader fun. (From: Q <email@hidden>)



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