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It seems to me that StorableClass.clAttrValues and StorableClass.clAttrDesc is always empty. Each empty HashMap takes 40(HashMap)+80(table with 16 elements) bytes and there are 30-100 instances of this class.
Fixed. Checking in src/org/netbeans/mdr/storagemodel/StorableClass.java; /cvs/mdr/src/org/netbeans/mdr/storagemodel/StorableClass.java,v <-- StorableClass.java new revision: 1.39; previous revision: 1.38 done