Retrieving bytes error!!

Hello! i have problem when retrieving a byte array
from postgres.

I'm saving a file (open office) with the following
code...

FileInputStream fis = new
FileInputStream(doc.getFile());
length = (doc.getFile()).length();
PreparedStatement ps = connection.prepareStatement
("INSERT INTO
documents VALUES (?, ?, ?, ?)");
ps.setInt(1, doc.getDocumentId());
ps.setString(2, doc.getFileName());
ps.setDate(3, new
java.sql.Date(System.currentTimeMillis()));
ps.setBinaryStream(4, fis, (int) length);
ps.close();


int insertado=ps.executeUpdate();

=====
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