bytea problem

Hello, this is my problem :
I use java + postgres and I want to store image files into a table

my table : (id int, image bytea)

the code :
byte bytes[] = new byte[(int)file.length()];

sqlq ="UPDATE table set image= ? where id=?";
ps = .....prepareStatement(sqlq);
ps.setBytes(2,bytes);
ps.setString(2,id);

put the file into my table, stream of 41054 bytes, OK.

but when I retrieve it from the database resultSet.getBytes("image") gives
an array of 82108 bytes!!
worst of all those bytes I get have no sense at all, like 00 00 00 or 11
11....

thanks for the help!

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