StreamCorruptedException using readObject()
I wrote a object to .ser file using writeObject().
and then again opened the file for writing in append mode,
and wrote again a object to the .ser file.
now the problem is using readObject() for the first time retrieve the first object added.
but again doing a readObject() does not return the second object added.instead it throws
java.io.StreamCorruptedException.folowing is the sample code
File file =new File("/home/dhans/travelcache/test.ser");
ObjectOutputStream os =new ObjectOutputStream(
new BufferedOutputStream(new FileOutputStream(file)));
HashMap hm =new HashMap();
hm.put("cd","1001");
os.writeObject(hm);
os.flush();
os.close();
ObjectOutputStream os1 =new ObjectOutputStream(
new BufferedOutputStream(new FileOutputStream(file,true)));
// OPENED FILE FOR append mode
HashMap hm1 =new HashMap();
hm1.put("cd1","1002");
os1.writeObject(hm1);
os1.flush();
os1.close();
ObjectInputStream is =new ObjectInputStream(
new BufferedInputStream(new FileInputStream(file)));
HashMap hm2 = (HashMap)is.readObject();
HashMap hm3 = (HashMap)is.readObject();// exception occurs HERE
is.close();
but if i add the two objects at a time like
ObjectOutputStream os =new ObjectOutputStream(
new BufferedOutputStream(new FileOutputStream(file)));
HashMap hm =new HashMap();
hm.put("cd","1001");
os.writeObject(hm);
HashMap hm1 =new HashMap();
hm1.put("cd1","1002");
os.writeObject(hm1);
using the readObject() two times does not throw any exception.
but my requirement is i have to open the file for append mode again to write the second and successive objects .
any help would be helpful.
thanks,
dhanasekaran
