How to compress a datastream using gzip?

[Arkie]

Hi,
 
I'm trying to compress an object using gzip but i get this error when i want to read in the data:

java.io.EOFException
        at java.io.ObjectInputStream$PeekInputStream.readFully(Unknown Source)
        at java.io.ObjectInputStream$BlockDataInputStream.readShort(Unknown Source)
        at java.io.ObjectInputStream.readStreamHeader(Unknown Source)
        at java.io.ObjectInputStream.<init>(Unknown Source)
 
this is the code:

Code

GeSHi (java):
	ObjectInputStream ois=new ObjectInputStream(new ObjectInputStream(
						new GZIPInputStream(
								new FileInputStream("image.gz"))));				
				System.out.println(ois.readObject());
Created by GeSHI 1.0.7.20

 
And this is how i write out the data

Code

GeSHi (java):
				ObjectOutputStream out =
							new ObjectOutputStream(
									new GZIPOutputStream(
											new FileOutputStream("image.gz")));
						out.writeObject(img);
 
						out.close();
						System.out.println(out);
Created by GeSHI 1.0.7.20

output:
java.io.ObjectOutputStream@ef22f8
java.io.ObjectOutputStream@1ffb8dc
java.io.ObjectOutputStream@54172f

writing seems to work but i don't know how to read it back in. Gzip seems to be the best solution to compress an single object but if  there is a better way let me know.