Problem while inserting a byte array into a bytea column

This is the statement initilization---------------------------------------------------------------------------------------------
PreparedStatement newFile = dbConnection.prepareStatement("insert into gm_files values (?,?,?,?)");
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This is the database table struct --------------------------------------------------------------------------------------------
Column data-type size
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reference text N/A
nome text N/A
date datetime N/A
content bytea N/A
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This is the code i am using to insert the file into the database. -------------------------------------------------------
public synchronized boolean createFile (String reference, String name, Date index, byte[] content) {
try {
newFile.getConnection().setAutoCommit(false);
content = ZipUtils.compress(content);
System.out.println("After compression file is " + content.length);
java.io.ByteArrayInputStream bytes = new java.io.ByteArrayInputStream(content);
newFile.setString(1, reference);
newFile.setString(2, name);
newFile.setTimestamp(3, AbstractDB.getTimeStamp(index));
newFile.setBinaryStream(4, bytes, content.length);
newFile.executeUpdate();
newFile.getConnection().commit();
newFile.getConnection().setAutoCommit(true);
return true;
} catch (Exception ex) {
ex.printStackTrace();
return false;
}
}
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When it gets to the executeUpdate() it returns the following error----------------------------------------------------

java.sql.SQLException: ERROR: column "content" is of type 'bytea' but expression is of type 'integer'
You will need to rewrite or cast the expression
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