http://opensource.atlassian.com/projects/hibernate/browse/HHH-5453
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Although it is unlikely that a class will have more than 409600 bytes, ByteCodeHelper.readByteCode() will fail in this case.
The programmer's intention was clear: handle any file size; but he or she forgot to add a call to inputStream.read() at the end of the loop

...
r = inputStream.read( buffer );
while ( r >= buffer.length )

{ byte[] temp = new byte[ classBytes.length + buffer.length ]; System.arraycopy( classBytes, 0, temp, 0, classBytes.length ); System.arraycopy( buffer, 0, temp, classBytes.length, buffer.length ); classBytes = temp; // THERE SHOULD BE A "r = inputStream.read( buffer )" HERE }