Problem with serialization

[Alejandro Barrero]

I am having a problem with serialization. I am serializing to a string a CachedRowSetImpl object in a server.

	private String serialize(CachedRowSetImpl cachedRowSet) {
		MyOutputStream myOutputStream = new MyOutputStream();
		try {
			ObjectOutputStream serializer = new ObjectOutputStream(myOutputStream);
			serializer.writeObject(cachedRowSet);
		} catch (IOException e) {
			return null;
		}
		return myOutputStream.getString();
	}
	private static class MyOutputStream extends OutputStream {
		private StringBuilder stringBuilder = new StringBuilder();
		@Override
		public void write(byte[] bytes, int off, int len) throws IOException {
			for (int i = off; i < off + bytes.length; i++) {
				char nextChar = (char) bytes[i];
				this.stringBuilder.append(nextChar);
			}
		}
		@Override
		public void write(byte[] bytes) throws IOException {
			for (int i = 0; i < bytes.length; i++) {
				char nextChar = (char) bytes[i];
				this.stringBuilder.append(nextChar);
			}
		}
		@Override
		public void write(int theByte) throws IOException {
			char nextChar = (char) theByte;
			this.stringBuilder.append(nextChar);
		}
		public String getString() {
			return this.stringBuilder.toString();
		}
	}

and I return the string in an HTTP request. I am getting the error "java.io.StreamCorruptedException: invalid stream header:EFBFDEF" trying to deserialize the object in the line "cachedRowSet = (CachedRowSet) objectInputStream.readObject(); "

	public CachedRowSet getObjectsRowSet(String selectStatement)
			throws ORMException {
		String remoteCommand = GET_OBJECTS_ROW_SET + "&Arguments=" + selectStatement;
		String cachedRowSetImplString = remoteResults(remoteCommand);
		System.out.println(cachedRowSetImplString);
		if (cachedRowSetImplString.startsWith("SQL")) { throw new ORMException(
				ORMException.ExceptionType.REMOTE_EXCEPTION); }
		ByteArrayInputStream byteArrayInputStream = new ByteArrayInputStream(cachedRowSetImplString.getBytes());
		CachedRowSet cachedRowSet = null;
		try {
			ObjectInputStream objectInputStream = new ObjectInputStream(byteArrayInputStream);
			cachedRowSet = (CachedRowSet) objectInputStream.readObject();
		} catch (Exception e1) {
			throw new ORMException(ORMException.ExceptionType.REMOTE_EXCEPTION);
		}
		return cachedRowSet;
	}

[Alejandro Barrero]

I am also having problem with XML serialization. On the server I have

	private String serialize(CachedRowSetImpl cachedRowSet) {
		MyOutputStream myOutputStream = new MyOutputStream();
		XMLEncoder encoder = new XMLEncoder(myOutputStream);
		encoder.writeObject(cachedRowSet);
		encoder.close();
		return myOutputStream.getString();
	}

In the client I have

	public CachedRowSet getObjectsRowSet(String selectStatement)
			throws ORMException {
		String remoteCommand = GET_OBJECTS_ROW_SET + "&Arguments=" + selectStatement;
		String xcachedRowSetImplString = remoteResults(remoteCommand);
		System.out.println(xcachedRowSetImplString);
		if (xcachedRowSetImplString.startsWith("SQL")) { throw new ORMException(
				ORMException.ExceptionType.REMOTE_EXCEPTION); }
		ByteArrayInputStream byteArrayInputStream = new ByteArrayInputStream(xcachedRowSetImplString.getBytes());
		CachedRowSet cachedRowSet = null;
		try {
			XMLDecoder decoder = new XMLDecoder(byteArrayInputStream);
			cachedRowSet = (CachedRowSetImpl) decoder.readObject();
		} catch (Exception e1) {
			throw new ORMException(ORMException.ExceptionType.REMOTE_EXCEPTION);
		}
		return cachedRowSet;
	}

But the text that I am getting is only "<?xml version="1.0" encoding="UTF-8"?> <java version="1.6.0_20" class="java.beans.XMLDecoder"> <object class="com.sun.rowset.CachedRowSetImpl"/> </java>"; there is no data!

Also, I was trying originally to transer the CachedRowSetImpl object constructing a JSON string (Google JSON ) but I was getting an error that the object had a circular reference.

What I really want to do is to serialize and transfer a JDBC ResultSet. Can anybody tell me how to do that?

[Alejandro Barrero]

RESOLVED. I am using Java serialization and I use URL encode to send and URL decode to receive.