NullpointerException

[pradeep84]

Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
wat does it mean...
how to debug this runtime error..
Help me.. plz....

Regards
pradeep

[Nepomuk]

Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
wat does it mean...
how to debug this runtime error..
Help me.. plz....

Regards
pradeep

A NullPointerException means, that it can't find something, that should be there. However, without the code, which throws this Exception, we'll hardly be able to help you.

Greetings,
nepomuk

[r035198x]

Do not flood the forum with the same question.
NullPointerException means that you derefenced a null value. One of your variables was pointing to the null reference (nothing) and you dereferenced it.

[pradeep84]

hi ...
this is the program .. where i got runtime error.., can u say me where i hav done a mistake....

import java.applet.*;
import java.awt.*;
import java.sql.*;
import java.awt.event.*;
import sun.jdbc.odbc.*;
public class SPlanting extends Frame implements ActionListener
{
TextField date,nom,tb,tl,st,ft,pc,on;
Label l1,l2,l3,l4,l5,l6,l7,l8;
Button save,exit;
Connection con;
ResultSet rs;
Statement stmt;
String s1,s2,s8;
int s3,s4,s5,s6,s7;
public SPlanting()
{
super("SPlanting ");
setSize(800,800);
setLayout(new GridLayout(7,2,45,45));
l1=new Label("Date");
l2=new Label("Noofmixes");
l3=new Label("TotalBentomikused");
l4=new Label("TotalLusformused");
l5=new Label("starttime");
l6=new Label("Offtime");
l7=new Label("PowerConsumed");
l8=new Label("Opertorname");


add(l1);
add(date);
add(l2);
add(nom);
add(l3);
add(tb);
add(l4);
add(tl);
add(l5);
add(st);
add(l6);
add(ft);
add(l7);
add(pc);
add(l8);
add(on);

save.addActionListener(this);
exit.addActionListener(this);
setVisible(true);

try
{
Class.forName("sun.jdbc.odbc.Jdbc.OdbcDriver");
con=DriverManager.getConnection("jdbc.odbc.prism") ;
stmt=con.createStatement();
rs=stmt.executeQuery("select * from SPlanting ");
}
catch(ClassNotFoundException e)
{
System.out.println(e);
}
catch(SQLException e)
{
System.out.println(e);
}
addWindowListener(new WindowAdapter(){
public void WindowClosing(WindowEvent w) {System.exit(0);}});
}
public void actionPerformed(ActionEvent ae)
{
if(ae.getSource()==save)
{
s1=date.getText();
s2=nom.getText();
s3=Integer.parseInt(tb.getText());
s4=Integer.parseInt(tl.getText());
s5=Integer.parseInt(st.getText());
s6=Integer.parseInt(ft.getText());
s7=Integer.parseInt(pc.getText());
s8=on.getText();
try
{
String query ="insert into SPlanting(Date,Noofmixes,TotalBentomikused,TotalLu sformused,starttime,Offtime,PowerConsumed,Opertorn ame,Offtime,Shortage,Cycles/day)"+ "values('"+s1+"','"+s2+"','"+s3+"','"+s4+"','"+s5+ "','"+s6+"','"+s7+"','"+s8+"')";
Class.forName("sun.jdbc.odbc.Jdbc.OdbcDriver");
con=DriverManager.getConnection("jdbc:odbc:prism") ;
stmt=con.createStatement();
rs=stmt.executeQuery(query);
stmt.close();
}
catch(ClassNotFoundException e)
{
System.out.println(e);
}
catch(SQLException e)
{
System.out.println(e);
}
}
if(ae.getSource()==exit)
{
System.exit(0);
}
}
public static void main(String args[])
{
SPlanting sp=new SPlanting();
}
}


regards
pradeep

[r035198x]

hi ...
this is the program .. where i got runtime error.., can u say me where i hav done a mistake....

import java.applet.*;
import java.awt.*;
import java.sql.*;
import java.awt.event.*;
import sun.jdbc.odbc.*;
public class SPlanting extends Frame implements ActionListener
{
TextField date,nom,tb,tl,st,ft,pc,on;
Label l1,l2,l3,l4,l5,l6,l7,l8;
Button save,exit;
Connection con;
ResultSet rs;
Statement stmt;
String s1,s2,s8;
int s3,s4,s5,s6,s7;
public SPlanting()
{
super("SPlanting ");
setSize(800,800);
setLayout(new GridLayout(7,2,45,45));
l1=new Label("Date");
l2=new Label("Noofmixes");
l3=new Label("TotalBentomikused");
l4=new Label("TotalLusformused");
l5=new Label("starttime");
l6=new Label("Offtime");
l7=new Label("PowerConsumed");
l8=new Label("Opertorname");


add(l1);
add(date);
add(l2);
add(nom);
add(l3);
add(tb);
add(l4);
add(tl);
add(l5);
add(st);
add(l6);
add(ft);
add(l7);
add(pc);
add(l8);
add(on);

save.addActionListener(this);
exit.addActionListener(this);
setVisible(true);

try
{
Class.forName("sun.jdbc.odbc.Jdbc.OdbcDriver");
con=DriverManager.getConnection("jdbc.odbc.prism") ;
stmt=con.createStatement();
rs=stmt.executeQuery("select * from SPlanting ");
}
catch(ClassNotFoundException e)
{
System.out.println(e);
}
catch(SQLException e)
{
System.out.println(e);
}
addWindowListener(new WindowAdapter(){
public void WindowClosing(WindowEvent w) {System.exit(0);}});
}
public void actionPerformed(ActionEvent ae)
{
if(ae.getSource()==save)
{
s1=date.getText();
s2=nom.getText();
s3=Integer.parseInt(tb.getText());
s4=Integer.parseInt(tl.getText());
s5=Integer.parseInt(st.getText());
s6=Integer.parseInt(ft.getText());
s7=Integer.parseInt(pc.getText());
s8=on.getText();
try
{
String query ="insert into SPlanting(Date,Noofmixes,TotalBentomikused,TotalLu sformused,starttime,Offtime,PowerConsumed,Opertorn ame,Offtime,Shortage,Cycles/day)"+ "values('"+s1+"','"+s2+"','"+s3+"','"+s4+"','"+s5+ "','"+s6+"','"+s7+"','"+s8+"')";
Class.forName("sun.jdbc.odbc.Jdbc.OdbcDriver");
con=DriverManager.getConnection("jdbc:odbc:prism") ;
stmt=con.createStatement();
rs=stmt.executeQuery(query);
stmt.close();
}
catch(ClassNotFoundException e)
{
System.out.println(e);
}
catch(SQLException e)
{
System.out.println(e);
}
}
if(ae.getSource()==exit)
{
System.exit(0);
}
}
public static void main(String args[])
{
SPlanting sp=new SPlanting();
}
}


regards
pradeep

This is the second time I'm telling you to use code tags when posting code. (that's not a good thing on your part).
Keep this problem in this original thread. Double posting is also against site rules.

This thread will now be closed.