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Build from Nov 10, JDK1.5.0. org.netbeans.modules.vcscore.cache.impl.VcsCacheFile$VcsPersistentData has field of type java.io.File that refers to netbeans.cmd.cache file. These objects are often big as they keep absolute path to these files and have a lot of duplicates. For my project that is stored in /usr/local/home/radim/fakeNetbeans every File object retains at least 160 bytes (path ending with CVS/netbeans.cmd.cache, array, String and File overhead).
This is being reimplemented into 4.1.
Redesigned cache does not keep any io.File.