NullpointerException

**Nepomuk** · Sep 10 '07, 09:16 AM

Originally posted by pradeep84

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

Regards
pradeep

A NullPointerExce ption 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** · Sep 10 '07, 09:23 AM

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

**pradeep84** · Sep 10 '07, 09:26 AM

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("SPlantin g ");
setSize(800,800 );
setLayout(new GridLayout(7,2, 45,45));
l1=new Label("Date");
l2=new Label("Noofmixe s");
l3=new Label("TotalBen tomikused");
l4=new Label("TotalLus formused");
l5=new Label("starttim e");
l6=new Label("Offtime" );
l7=new Label("PowerCon sumed");
l8=new Label("Opertorn ame");

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.addActionL istener(this);
exit.addActionL istener(this);
setVisible(true );

try
{
Class.forName(" sun.jdbc.odbc.J dbc.OdbcDriver" );
con=DriverManag er.getConnectio n("jdbc.odbc.pr ism");
stmt=con.create Statement();
rs=stmt.execute Query("select * from SPlanting ");
}
catch(ClassNotF oundException e)
{
System.out.prin tln(e);
}
catch(SQLExcept ion e)
{
System.out.prin tln(e);
}
addWindowListen er(new WindowAdapter() {
public void WindowClosing(W indowEvent w) {System.exit(0) ;}});
}
public void actionPerformed (ActionEvent ae)
{
if(ae.getSource ()==save)
{
s1=date.getText ();
s2=nom.getText( );
s3=Integer.pars eInt(tb.getText ());
s4=Integer.pars eInt(tl.getText ());
s5=Integer.pars eInt(st.getText ());
s6=Integer.pars eInt(ft.getText ());
s7=Integer.pars eInt(pc.getText ());
s8=on.getText() ;
try
{
String query ="insert into SPlanting(Date, Noofmixes,Total Bentomikused,To talLusformused, starttime,Offti me,PowerConsume d,Opertorname,O fftime,Shortage ,Cycles/day)"+ "values('"+s1+" ','"+s2+"','"+s 3+"','"+s4+"',' "+s5+"','"+s6+" ','"+s7+"','"+s 8+"')";
Class.forName(" sun.jdbc.odbc.J dbc.OdbcDriver" );
con=DriverManag er.getConnectio n("jdbc:odbc:pr ism");
stmt=con.create Statement();
rs=stmt.execute Query(query);
stmt.close();
}
catch(ClassNotF oundException e)
{
System.out.prin tln(e);
}
catch(SQLExcept ion e)
{
System.out.prin tln(e);
}
}
if(ae.getSource ()==exit)
{
System.exit(0);
}
}
public static void main(String args[])
{
SPlanting sp=new SPlanting();
}
}

regards
pradeep

**r035198x** · Sep 10 '07, 09:34 AM

Originally posted by 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("SPlantin g ");
setSize(800,800 );
setLayout(new GridLayout(7,2, 45,45));
l1=new Label("Date");
l2=new Label("Noofmixe s");
l3=new Label("TotalBen tomikused");
l4=new Label("TotalLus formused");
l5=new Label("starttim e");
l6=new Label("Offtime" );
l7=new Label("PowerCon sumed");
l8=new Label("Opertorn ame");

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.addActionL istener(this);
exit.addActionL istener(this);
setVisible(true );

try
{
Class.forName(" sun.jdbc.odbc.J dbc.OdbcDriver" );
con=DriverManag er.getConnectio n("jdbc.odbc.pr ism");
stmt=con.create Statement();
rs=stmt.execute Query("select * from SPlanting ");
}
catch(ClassNotF oundException e)
{
System.out.prin tln(e);
}
catch(SQLExcept ion e)
{
System.out.prin tln(e);
}
addWindowListen er(new WindowAdapter() {
public void WindowClosing(W indowEvent w) {System.exit(0) ;}});
}
public void actionPerformed (ActionEvent ae)
{
if(ae.getSource ()==save)
{
s1=date.getText ();
s2=nom.getText( );
s3=Integer.pars eInt(tb.getText ());
s4=Integer.pars eInt(tl.getText ());
s5=Integer.pars eInt(st.getText ());
s6=Integer.pars eInt(ft.getText ());
s7=Integer.pars eInt(pc.getText ());
s8=on.getText() ;
try
{
String query ="insert into SPlanting(Date, Noofmixes,Total Bentomikused,To talLusformused, starttime,Offti me,PowerConsume d,Opertorname,O fftime,Shortage ,Cycles/day)"+ "values('"+s1+" ','"+s2+"','"+s 3+"','"+s4+"',' "+s5+"','"+s6+" ','"+s7+"','"+s 8+"')";
Class.forName(" sun.jdbc.odbc.J dbc.OdbcDriver" );
con=DriverManag er.getConnectio n("jdbc:odbc:pr ism");
stmt=con.create Statement();
rs=stmt.execute Query(query);
stmt.close();
}
catch(ClassNotF oundException e)
{
System.out.prin tln(e);
}
catch(SQLExcept ion e)
{
System.out.prin tln(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.

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