Re: Out of memory with file streams

So I am on the lookout for a memory leak, however, I can2"t find it. The
preprocessing method basically does the following (suppose the inFile
and the treeFile are given Files):

final BufferedReader corpus = new BufferedReader(new FileReader(inFile));
final ObjectOutputStream treeOut = new ObjectOutputStream(new
BufferedOutputStream(new FileOutputStream(treeFile)));
final int nbTrees = TreebankConverter.parseNegraTrees(corpus, treeOut);
try {
    treeOut.close();
} catch (final IOException e) {
    // if it cannot be closed, it wasn2"t open
}
try {
    corpus.close();
} catch (final IOException e) {
    // if it cannot be closed, it wasn2"t open
}
...
This is also done one by one:

TreebankConverter.skipHeader(corpus);
String bosLine;
while ((bosLine = corpus.readLine()) != null) {
 final StringTokenizer tokens = new StringTokenizer(bosLine);
 final String treeIdLine = tokens.nextToken();
 if (!treeIdLine.equals("%%")) {
  final String treeId = tokens.nextToken();
  final NodeSet forest = parseSentenceNodes(corpus);
  final Node root = forest.toTree();
  final BinaryNode binRoot = root.toBinaryTree(new ArrayList<Node>(), 0);
  final BinaryTree binTree = new BinaryTree(binRoot, treeId);
  treeOut.writeObject(binTree);
 }
}

I see no reason in the above code why the GC wouldn2"t discard the trees
that have been constructed before.

So the only place for memory problems I see here is the file access.
However, as I grasp from the Javadocs, both FileReader and
FileOutputStream are, indeed streams, that do not have to remember what
came before. Is the buffering the problem, maybe?