Fetching binary data from database

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Java

Hi
i was writing a code to fetch binary data from database into a byte array.My code snippet is as follows

public byte[] getRecord(String query, String[] expValues) throws SQLException, Exception 
{
			
//expvalues is the column names i pass while calling  a function
    byte tempResult =0 ;
    byte[] result = null;

    Connection con = openConnection();
    Statement stmt = con.createStatement();
    ResultSet rs = stmt.executeQuery(query);
    int size = 0;
    int i = 0;
    
    // Loop through the result set
    while (rs.next()) 
    {
        size++;
        for (i = 0; i < expValues.length; i++)
        {
            result = rs.getBytes(1);
        }
    }
    // Close the result set, statement and the connection
    rs.close();
    stmt.close();
    con.close();
    return result;
}
 // eof getRecordSet

when i run the code i get the following error

sqle  java.sql.SQLException: Unable to convert between java.lang.Integer and BINARY.
Exception  java.lang.NullPointerException

anybody plz can help on why i am geeting the error OR how to fetch binary data from database in java?