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Created attachment 269706 [details] Patch to speedup weaving with Java 9 Actually a matching class file is searched by iterating through all modules. This makes weaving very slow as the module tree is scanned over and over again. The attached patch builds a TOC of all class files once to speedup the search which greatly improves the speed of the weaving process.
Thanks Mario - I took your patch and further changed things somewhat. I hadn't done anything about this sooner as I was waiting for the actual JDK to settle down and see where we ended up. In my changes I didn't want a cache of all classes, too expensive, so I created a package cache with a soft hashmap for individual files. The package cache has about 1600 entries in (for a standard Java9) whilst a full file map had 40000 entries (many of which we'd never use). I think further improvements are possible (for example a timer that clears the cache if unused for a few mins, that would benefit LTW) but this is a good first start and performance is back to where it needs to be.
