Trouble about Element

Question

I was doing something with SOAP JAVA, and ODBC. I want to send the information selected from database back to client, use Element. but the element transmit back is null, seems the information couldnt add to the Element.
public class checkData{
public Element GetStudentPInfo(String arg1) throws IllegalArgumentException{
     Element result=null;
     if (arg1 == null)
throw new IllegalArgumentException("Parameter wrong");
String url="jdbc:odbc:Registry";
String cs="select * from student where ID = '" arg1 "'";
Connection con;
Statement stmt;
try {
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
} catch(java.lang.ClassNotFoundException e) {
System.err.print("ClassNotFoundException:");
System.err.println(e.getMessage());
try {
con=DriverManager.getConnection(url);
stmt=con.createStatement();
ResultSet rs=stmt.executeQuery(cs);
result.setAttribute("name",rs.getString("Name"));
result.setAttribute("id",arg1);
result.setAttribute("telephone",rs.getString("Telephone"));
result.setAttribute("address",rs.getString("Address"));
result.setAttribute("email",rs.getString("EMAIL"));
stmt.close();
con.close();
} catch(SQLException ex) {
System.err.println("SQLException: "+ex.getMessage());
return result;
}

Answer 1

the element transmit back is nullThat's because you created it that way, in this line of code:Element result=null;That code later, where you do "result.setAttribute(...)", will throw a NullPointerException if it is ever executed, because result is a null reference. You need to create an Element object. I don't know anything about your Element class but maybeElement result=new Element();would work.