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
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    Column        data-type        size
    --------------------------------------------
    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.
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  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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