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StreamCorruptedException vs InvalidClassException  RSS feed

seema mani
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I'm opening a URLConnection and writing some objects(String,Vector etc) to a servlet using ObjectOutputStream.In the servlet when I try to read it using readObject, I get
Version Mismatch,
Expected 5 and got 2
Now someone had suggested that this could be happening because of different JDK versions on the client and server. In my previous experiences with streams, I have got the error " Version; Local class not compatible " whenever class versions were not matching. Could anyone tell me the difference between these 2 exceptions? Which are the causes for InvalidClassException vs. StreamCorruptedException ? How do we handle StreamCorruptedException in the case of built-in classes like String and Hashtable ?
Thanks in advance
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