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Posted to dev@commons.apache.org by bu...@apache.org on 2005/07/16 13:24:53 UTC

DO NOT REPLY [Bug 35763] New: - [collections] UnboundedFifoBuffer deserialization is broken

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http://issues.apache.org/bugzilla/show_bug.cgi?id=35763

           Summary: [collections] UnboundedFifoBuffer deserialization is
                    broken
           Product: Commons
           Version: 3.1
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Collections
        AssignedTo: commons-dev@jakarta.apache.org
        ReportedBy: scolebourne@joda.org


The patch should be:

private void readObject(ObjectInputStream in) throws IOException,
ClassNotFoundException {
	in.defaultReadObject();
	int size = in.readInt();
-	buffer = new Object[size];     
+	buffer = new Object[size + 1];     
	for (int i = 0; i < size; i++) {
		buffer[i] = in.readObject();
	}
	head = 0;
	tail = size;
}

Setting tail = size - 1; just caused another bug (ie you couldn't get the last
element in the buffer). This is because tail is supposed to point to the next
unused cell in the buffer array. By creating the buffer to be size + 1, tail
will be set to a valid cell within buffer that is empty (but the cell before it
has an element in it), and the class works properly. 

Thomas Knych, Jordan Krey & Citigroup Analytics Dev team

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