Description Ernest Pasour 2005-08-05 15:16:11 EDT

We are working with the classpath container extension point and found that if we
add a lot of jars to our container, the JDT starts thrashing the garbage
collector.  Upon further investigation, we found that there is a limit of 2000
packages in the package cache in the JavaModelCache.  Every time I delete and
readd a semicolon and resave the file, the model cache appears to go rebuild the
cache data for all of those jars (even though I'm not actually referencing all
of them from my code) and this makes the garbage collector thrash.  Looking at
the code, it appears that 2000 is a hardcoded limit.  There is a setSpaceLimit()
method on LRUCache, but the class is internal, and I don't see a public way to
get the cache pointer anyway.  

So even though I'm running with -Xmx512m, I'm thrashing memory at a much lower
level than that, and I don't see a workaround other than to not add so many jars
to my classpath.