code login

[kevN]

hey guys!
here is the code for logging in that keeps giving a null pointer exception.
Can u guys figure out the problem 4 me?
Class.forName("com.mysql.jdbc.Driver");
conn = (Connection) DriverManager.getConnection("jdbc:mysql://localhost:3306/project","root","");
ps = (PreparedStatement) conn.prepareStatement("SELECT UserName,Password,Domain FROM user_details WHERE UserName=?");
ps.setString(1,CurrentUser);
ResultSet rset = ps.executeQuery();
rseto = rset.getMetaData().getColumnCount();

while(rset.next()){
for(int i=0;i<=3;i++)
carer[0] = (String)rset.getObject(i);
}

if(carer[1].equals(CurrentUser) && carer[2].equals(password) && carer[3].equals(selectDomain)){
JOptionPane.showMessageDialog(null,"Welcome to Express Fleet Management.");
firstInterface f = new firstInterface();
f.setVisible(true);
this.dispose();
}else
JOptionPane.showMessageDialog(null,"Either your user name,password or domain is incorrect.Please try again.");
conn.close();

[serjant]

What is the full error or exception output?

[Deepa]

Hi,
If u pass null value in sql means,u will get the NullPointerException.

[Eranga]

NullPointerException means you found a null value at runtime in your application. Did you try to debug and see what happen there?

[Deepa]

Hi,
Ya,Null Pointer Exception means found null value at runtime.

[Eranga]

Hi,
Ya,Null Pointer Exception means found null value at runtime.

Are you looking to pass total number of posts of 20? Few times I've seen that you are just posting the same things.

[serjant]

He wants to become a star hero of the forum.

[Eranga]

He wants to become a star hero of the forum.

Not in a good way. Did you see his posts? Some of them are completely wrong, and some of them are useless.

[serjant]

Sure and some of them are similar to yours ones.

[Eranga]

Those are things useless actually, saying the same thing. I have to keep eye on him ;)