Java Programming Forums - The Java Community - Exceptions

null pointer exception in "rs.next()"

Nimisha — Wed, 12 Jun 2013 07:42:28 GMT

Plz.................. help, hv gt null pointr exception in rs.next()

//This is my code

po=con.prepareCall("{call Add_Customer_Ref(?)}");
po.registerOutParameter(1,Types.VARCHAR);
po.execute();
rs = po.getResultSet();

while(rs.next()){
System.out.println(rs.getString(1));
}
po.getMoreResults();
rs=po.getResultSet();
while(rs.next()){
System.out.println(rs1.getString(1));
}
rs.close();
rs1.close();

//StoredProcedure code:

ALTER PROCEDURE [dbo].[Add_Customer_Ref]

@customer_ref_no varchar(50)=null OUTPUT

AS
BEGIN

SET NOCOUNT ON;

SELECT @customer_ref_no=customer_ref_no from Table_Customers
END

:((

Security exception

Nimisha — Thu, 06 Jun 2013 13:25:22 GMT

Exception in thread "AWT-EventQueue-0" java.lang.SecurityException: Prohibited package name: java.awt

interface - public void method() throws SomeException;

JavaOwl — Thu, 06 Jun 2013 07:07:56 GMT

I need to write the implementation for the following interface. I noticed that "throws SomeException" are marked in the method declaration header. Does it mean I must specify the particular precondition and construct that particular exception object for a throw statement in the method?

public interface MinHeap {

public void insert(E item) throws HeapOverflowException;
public E findMin() throws NoSuchElementException;
public E deleteMin() throws NoSuchElementException;
}

[SOLVED] exception use array (help me)

young216 — Sat, 01 Jun 2013 04:37:10 GMT

Please make a simulation program of Student Mark List with these following descriptions:
1. The program consists of 4 menu:
• 1. Input Student
• 2. See All Data
• 3. Edit Data
• 4. Exit
2. If user choose menu 1, then user will be asked to input number of student in the list. Validate the number of student must be between 1 and 5.
3. Then the program will be asked user to input Student Id, Student Name and Student Mark as many as the number of student that user input before. Validate:

Student Id must be 10 characters long.
Student Name must be filled.
Student Mark must be between 0 and 100.

4. If user choose menu 2, then:

Show the student data from the list include student number.
Then user will be asked to choose the student number of the student to showing the completed student data.

5. If user choose menu 3, then:

Show the student data from the list include student number.
Then user will be asked to choose the student number of the student to showing the completed student data which user wants to

edit.
 Then user will be asked to input Student Id, Student Name and Student mark with the validation same as before.

please, check my coding

[/COLOR]

Code :

import java.util.*;
import java.io.*;
 
public class J1601226535_07{
	public static void main (String[]args){
		Scanner in = new Scanner(System.in);
		int number = 5;//0-4
		int choice;
		int student, ID, Name;
		boolean flag;
 
		do{
			flag = false; // untuk nilai yg minus atau salah
				try{
				number = in.nextInt();
				}catch(InputMismatchException e){
						flag=true;
						System.out.println("Inputan harus bilangan bulat");
						in.nextLine();
				}
	}while(flag);
 
 
			System.out.println("\t\t Student Mark List \t\t");
			System.out.println ("1. Input Student");
			System.out.println("2. See All Data");
			System.out.println("3. Edit Data");
			System.out.println("4. Exit");
 
			do{
				System.out.print("Input Your Choice [1-4]: ");
				choice = in.nextInt();
			}while(menu < 1 || menu > 4);
				switch(menu){
					case 1 : System.out.println(How many student[1-5] ? ); break;
					case 2 : System.out.println(See All Data); break;
					case 3 : System.out.println(Edit Data); break;
						}
			}while(menu != 4);
 
 
					System.out.println("Please input data of 5 people");
					System.out.print("1 \t Please input Student ID [10]= ");
					ID = in.nextInt();
					System.out.print("\t Please input Student Name\t= ");
					Name = in.nextInt();
					System.out.print("\t Please input Student Mark [0-100]= ");
					System.out.print("2 \t Please input Student ID [10]= ");
					ID = in.nextInt();
					System.out.print("\t Please input Student Name\t= ");
					Name = in.nextInt();
					System.out.print("\t Please input Student Mark [0-100]= ");
					System.out.print("3 \t Please input Student ID [10]= ");
					ID = in.nextInt();
					System.out.print("\t Please input Student Name\t= ");
					Name = in.nextInt();
					System.out.print("\t Please input Student Mark [0-100]= ");
					System.out.print("4 \t Please input Student ID [10]= ");
					ID = in.nextInt();
					System.out.print("\t Please input Student Name\t= ");
					Name = in.nextInt();
					System.out.print("\t Please input Student Mark [0-100]= ");
					System.out.print("5 \t Please input Student ID [10]= ");
					ID = in.nextInt();
					System.out.print("\t Please input Student Name\t= ");
					Name = in.nextInt();
					System.out.print("\t Please input Student Mark [0-100]= ");
 
		}
	}

Finally Block

AbbasAlasgarov — Fri, 31 May 2013 18:41:01 GMT

What is the purpose of using Finally Block?
I write code without Finally Block and with Finally Block. The result is same.

CODE with FinallyBlock:

Code java:

public class Exception{
public static void main(String[] args){
int x = 4, y = 0;
try{
System.out.println(x/y);
} catch(ArithmeticException e){
System.out.println(e.toString());
}
finally{
System.out.println("CODE with FinallyBlock");
}
}
}

CODE without FinallyBlock:

Code java:

public class Exception{
public static void main(String[] args){
int x = 4, y = 0;
try{
System.out.println(x/y);
} catch(ArithmeticException e){
System.out.println(e.toString());
}
 
System.out.println("CODE without FinallyBlock");
 
}
}

I'm waiting for your helps, friends. Thanks

java.rmi.unknownhostexception :unknown host: pc error

hgauravnayak — Wed, 22 May 2013 20:58:23 GMT

Hello everyone,

I am beginner in java programming,when i try to run the program on the server side it is running fine but on the client side when i execute the code i get the error message java.rmi.unknownhostexception :unknown host: pc error. Program contains 4 files. I will post the code below.

ForExServerIntf.java

Code :

import java.rmi.*;
public interface ForExServerIntf extends Remote
{
  float currency(float f1) throws RemoteException;
}

ForExServerImpl.java

Code :

import java.rmi.*;
import java.rmi.server.*;
public class ForExServerImpl extends
UnicastRemoteObject implements ForExServerIntf
{
  public ForExServerImpl() throws RemoteException{}
  public float currency(float f1)
  throws RemoteException
  {
    return f1/49;
  }
}

ForExServer.java

Code :

import java.rmi.*;
import java.net.*;
public class ForExServer
{
  public static void main(String args[])
  {
    try
    {
      ForExServerImpl ForExImpl=new ForExServerImpl();
      Naming.rebind("ForExServer",ForExImpl);
      System.out.println("Server is running");
    }
    catch(Exception e)
    {
      System.out.println(e);
    }
  }
}

ForExClient.java

Code :

import java.io.*;
import java.rmi.*;
public class ForExClient
{
  public static void main(String args[])
  {
    try
    {
      String ForExURL="rmi://"+args[0]+"/ForExServer";
      ForExServerIntf ForExServerIntf=(ForExServerIntf)Naming.lookup(ForExURL);
      System.out.println("Enter value in rupees:"+args[1]);
      float f1=Float.valueOf(args[1]).floatValue();
      double d=ForExServerIntf.currency(f1);
      System.out.println("Converted value from rupees to dollar:"+d);
      double r=((int)((d*100.0)+0.5))/100.0;
      System.out.println("\nRounded value is:"+r);
    }
    catch(Exception e)
    {
      e.printStackTrace();
      System.out.println("Error");
    }
  }
}

Attachment of client side is given below
rmiregistry1.JPG

Please can anyone help me to solve the error.

Attached Images

rmiregistry1.JPG (216.0 KB)