Persisting raw file data using XMLEncoder

Question

Guys
I am trying to persist the 'Buffer' object which has a 'fileName' property. I dont want my object to be dependent on the machine containing the file 'fileName'. So I want to persist the data for 'fileName' file when XMLEncoder is used to persist 'Buffer' object. So I extended DefaultPersistenceDelegate. However I get OutOfMemoryError inside the initialize method. It seems that even though I am setting byTmp array to null after out.writeStatement the array byTmp is not garbage collected. Apparently the encoder is holding a reference to the byTmp array. Also note that the file is huge and cannot be loaded into a single byte array completely.
Can anyone think of a work around for this problem?
Thanks
Rahul
public class Buffer() {
private String fileName;
//These methods will be invoked by the XMLDecoder
public void startWritingBytes(String fileName) {
//open tmp file for writing
public void writeBytes(byte[] b) {
//write to tmp file
public void doneWritingBytes() {
//close file.
//uncompress tmp file and write to file 'fileName'
public static class BufferPersistenceDelegate extends
DefaultPersistenceDelegate {
public UnlimitedBufferPersistenceDelegate() {
super();
protected void initialize(Class<? > type, Object oldInstance, Object
newInstance, Encoder out) {
// Note, the "fileName" property will be set here.
super.initialize(type, oldInstance, newInstance, out);
try {
//First compress the file.
//Persist compressed data
try {
java.beans.Statement sm = null;
sm = new java.beans.Statement(oldInstance, "startWritingBytes",
new Object[] {fileName});
out.writeStatement(sm);
byte[] byTmp = null;
byte b = 0;
//Get OutOfMemoryError here
while ( (bytesRead = fin.read(buffer)) > 0) {
byTmp = new byte[bytesRead];
System.arraycopy(buffer, 0, byTmp, 0, bytesRead);
sm = new java.beans.Statement(oldInstance, "writeBytes",
new Object[] {byTmp});
out.writeStatement(sm);
byTmp = null;
sm = new java.beans.Statement(oldInstance, "doneWritingBytes",
null);
out.writeStatement(sm);
finally {
//close compressed file
//delete compressed file
catch (Throwable ex) {       
}

Answer 1

Sorry guys, I think I had the answer to the question in the question itself!!
I was not freeing the statement object. The problem disappears when I set sm to null.