1 Reply Latest reply on Jun 2, 2004 9:43 AM by zhangj

    not woking at first time

    zhangj Newbie

      I defined a class:
      import com.sun.rowset.*;
      import java.sql.*;
      public class RowSetAdaptor extends java.lang.Object implements java.io.Serializable
      {
      private String s;
      private CachedRowSetImpl rowset;

      public RowSetAdaptor()
      {
      try{

      rowset = new CachedRowSetImpl();

      }catch(Exception e){System.out.println("constructor:"+e);}


      }

      I put this class file in a jar and put this jar in the C:\jboss-3.2.3\server\default\lib
      in my code,I use this class:
      RowSetAdaptor rs = new RowSetAdaptor();
      or
      RowSetAdaptor rs = null;
      rs = new RowSetAdaptor();

      the first time after start jboss,I get error:
      constructor:java.lang.NullPointerException
      but this only happen on first time,if I run it again,no errors,why?looks like something not been populate in the memory for the first time.by the com.sun.rowset.* classes are in th rowset.jar which is also in C:\jboss-3.2.3\server\default\lib folder