RMI :: Find / Create A Registry And Binding Object

Jul 30, 2013

My program TestBind0 (code below) tries to find/create a registry and bind an object.

Find/create: it first tests if there is already a registry on that port; if not, then it tries to create one.

The program tries to find/create the registry on ports 40654, 50876, 30321, 33445, 1099, in this order, until it succeeds in both creating the registry and binding the object. Why does TestBind0 throw for each attempt

java.rmi.ConnectException: Connection refused to host: 192.168.1.64; nested exception is:
     java.net.ConnectException: Connection refused: connect
     at sun.rmi.transport.tcp.TCPEndpoint.newSocket(TCPEndpoint.java:601)
     at sun.rmi.transport.tcp.TCPChannel.createConnection(TCPChannel.java:198)
     at sun.rmi.transport.tcp.TCPChannel.newConnection(TCPChannel.java:184)
     at sun.rmi.server.UnicastRef.newCall(UnicastRef.java:322)

[Code] ...

In reg.rebind("TestBind0", obj);even when I have specified -Djava.security.policy==all.policy, with file all.policy in the current dir, containing

grant {
  permission java.security.AllPermission;
};

The program is run using command

java -cp bin -Djava.security.policy==all.policy TestBind0

The code:

import java.rmi.*;
import java.rmi.registry.*;
import java.rmi.server.*;
import java.util.*;
public class TestBind0 extends UnicastRemoteObject implements Counter {
  private static final long serialVersionUID = 1L;
  protected int count;

[Code] ....

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Task:The main method of the class Things below creates an object called printer deriving from the class PrintingClass and uses that object to print text. Your task is to write the PrintingClass class.

Program to complete:
import java.util.Scanner;
public class Things {
public static void main(String args[]) {
String characterString;
Scanner reader = new Scanner(System.in);
PrintingClass printer = new PrintingClass();
System.out.print("Type in the character string for printing: ");
characterString = reader.nextLine();
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// Write the missing class here

Note: In this exercise the solution is part of a conversion unit where many classes have been declared. Because of this the classes are not declared as public using the public attribute.

Example output

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My Class:
class PrintingClass {
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I changed this to 1.7, and deleted some following entries such as
 
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here is my code:

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[code]....

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[code]...

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[Code] ....

Matched expression found by findInLine: 34

ef56

is new line? right?

The java.util.Scanner.nextLine() method advances this scanner past the current line and returns the input that was skipped. This method returns the rest of the current line, excluding any line separator at the end.

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[Code] ....

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2.Create a second Balloon object with a name of your own choosing, and specify an initial altitude of -100 meters.

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5.Call the adjustAltitude method to increase the altitude of the object you created in step 2 by 150 meters.

6.Call the accessor methods of the Balloon class to get the name and altitude of each object. Print the data, one object per line.

7.Call the adjustAltitude method to decrease the altitude of the object you created in step 1 by 150 meters.

8.Make the object you created in step 2 descend to the same altitude as the other object. You may assume that the other object is at a lower altitude.

To get credit for step 8., the statement(s) you write must always work, regardless of the actual altitude of the second object. It cannot depend on you knowing the altitude of the second object, but must utilize the fact that the object knows its own altitude. In other words, if you use a literal in any way to set the altitude, it is not correct.

9.Call the accessor methods to get the name and altitude of each object. Print the data, one object per line.

10.Move the object you created in step 1 to an altitude that is four times its current altitude. As in step 8, the statement(s) you write must work for any altitude and may not depend on you figuring out the new altitude beforehand.

11.Attempt to move the object you created in step 2 to an altitude that is 150 meters below its current altitude.

12.Call the accessor methods to get the name and altitude of each object. Print the data, one object per line.

and this is the Balloon.java given:

// File: Balloon2.java
 // Modified Balloon class has overloaded constructors
 
/**
* A class to represent a hot-air balloon. Balloon objects have a name and an altitude.
*/
public class Balloon2
{
// instance variables
private String name ; // name of the balloon
private int altitude; // altitude (height) of balloon in meters
 
[Code] ....

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[code]....

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// Access the Scanner and ArrayList class by importing the java.util package.
import java.util.Scanner;

/** Project - A Country Object
* The purpose of this program is for the user to enter some information at most 10 countries. After the user has entered information about all the countries, the program should print out which countries in the list have the smallest and largest area and population density.
*/

public class Country
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private String countryName;
private int theArea;
private int thePopulation;
public Country(String countryName, int thePopulation, int theArea)

[Code] ....

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-----------
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[Code] .....

1) a.eat(); // Prints Animal eating ---> Static Binding 2) a.eat(); // Prints Dog eating ----> Dynamic Binding

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