On Unix platforms we would like to add the dependent classes for the Preferences
API into the class data sharing archive. These include roughly 300 XML parsing classes; adding them to the archive saves a significant fraction of some small
applications' startup time. Currently, attempts to add these classes result in
an overflow of the permanent generation because the sharing code can not
currently expand the heap during the preload phase. The initial PermSize should
be increased to 12 MB from 8 MB on 32-bit platforms to compensate for this.