JSF :: Language Support And Error Handling
Mar 3, 2014
I am new at JSF and i want to do some things.
->When the user request for a file that is not exists i want to redirect to a valid url where i can inform him that the file does not exists.
->I am trying to use the properties messages for the language that the user has. I want to use it cause i want to reuse some of the message and it is easier to translate the page to other languages. How when the browser has a default page English to let user change the language to Italian for example but for all page.
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Mar 7, 2014
I have studied about the hierarchy of exception classes in which Throwable class comes at the top and two of its direct subclasses are Error and Exception..I just want to ask if in some code snippet we throw an instance of Error or its subclass within the try catch block then will that be also called "exception handling" ? I am asking this because Error class is not a child class of Exception therefore cant be said an Exception, therefore handling the same should not be called exception handling
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Feb 19, 2014
On click of the ok button from a JSF page, a servlet is called on a new window. Servlet creates a CSV file , which will be streamed back for a download. Now if there is a error in the servlet, how can this be shown in the parent JSF?
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Feb 10, 2014
I have a GUI that prompts the user for information. When they click 'submit', a new customer gets created from a class like so ...
Java Code:
public void actionPerformed(ActionEvent arg0) {
Customer customer = new Customer(); // New customer object
customer.name = view.getName();
customer.age = Integer.parseInt(view.getAge());
customer.ccn = view.getCCNumber(); mh_sh_highlight_all('java');
I am having difficulties validating my variables for nulls. For instance ...
Java Code:
// METHOD TO RETRIEVE TEXTBOX INPUT -- NAME
public String getName() {
String name = null;
if (jtfFirstName.getText() == null || jtfLastName.getText() == null || !jtfFirstName.getText().matches("[a-zA-Z]+") || jtfLastName.getText().matches("[a-zA-Z]+")){ // Validate name fields
JOptionPane.showMessageDialog(null, "<html><i>Improper Input Detected.</i>
[code]...
I can't seem to win with this. Whether the fields are filled in properly or not, I get the error message and the program continues to completion using the name "null".
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May 8, 2014
I'm making a program that finds the maximum, minimum, and average values in an integer input ended with a negative number. For example, 4 5 6 -1 is min:4, max:6, and average:5.
It's supposed to handle faulty input in two situations:
1.When an input other than integers is given, the user is given a second chance to give a proper input.
2.When no numbers are given (which is only possible by giving nothing but the negative number end mark), an error message is given because diving by zero integers is impossible.
All the math works fine, but for some reason a proper input in the second chance doesn't. Failing the second chance works, and giving proper input all the way through works. If I fail the first input and then give a proper integer input on the second chance, the program skips over the calculation and gives the divide by zero error. All I could understand from the debugger is that the program is recognizing whatever the first number in that input is, but still keeps the number of numbers as zero (so it's not looping to compare all the numbers in the line either).
import java.util.Scanner;
public class FindNumbers implements FindNumbersInterface
{
double average;
double sum;
int numberOfNumbers;
int total;
[Code] .....
I have a few bits of //old stuff that I've been keeping in case I want to go back.
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Jun 23, 2014
On p.176 of EBJ 3 in Action (2nd edition),
MDS don't support all six transaction attributes. MDBs support only REQUIRE or NOT_SUPPORT.... There is no existing transaction to suspend or join when a message is delivered, The two options you have available are REQUIRE if you want a transaction.....
there is no existing transaction when a message is delivered from a queue to an MDB. Why we still need a transaction as it says " REQUIRE if you want a transaction"? When a message is delivered from the queue to the MDB, is this a transaction?
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Nov 11, 2014
I am building an application which needs to be able to get the user's location. In JavaScript I would use navigator.geolocation.getCurrentPosition()
Does WebEngine support this function? Obviously it will only work if the device has GPS. I am targeting windows tablets and phones which will have it.
Can I use the webEngine.executeJavascript() to call the javascript if it is supported.
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Jun 18, 2015
When a JavaScript client attempts to open a socket, instead of the connection opening it immediately closes. The client is using:
webSocket = new WebSocket("ws://localhost/example");
The same thing happens for com.sun.net.httpserver.HttpsServer where client is using:
webSocket = new WebSocket("wss://localhost/example");
How can I enable websocket support?
If it's not possible, how can I request for it to be added as a new feature?
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Oct 20, 2014
I am working on this experiment code, I keep getting an exception:
run:
Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: -256
at .MemoryManager.read(MemoryManager.java:68)
at .MemoryProcess.callMemory(MemoryProcess.java:39)
at .main(Lab3.java:29)
Picked up JAVA_TOOL_OPTIONS: -Dfile.encoding=UTF8
Java Result: 1
BUILD SUCCESSFUL (total time: 0 seconds)
The offending line is data=RAM[physicalAddress]; inside MemoryManager.java.
why this is exactly happening and thus correct my piece of code.
The code:
main.java
package experiment;
public class Main{
/**
* @param args the command line arguments
[Code].....
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Aug 16, 2014
I studied that java does not support multiple inheritance using classes. It is fine practically, but I have still a question in mind:Lets see the below code.
class Test{
------
------
}
class MyTest extends Test{
---------
---------
}
Here, as we know that that Object is Super class for every class in java. and I have already extends a Test class in MyTest.My question is: How is it possible to extend features of two class at the same time?
Theoretically,
MyTest extends Object &
MyTest extends Test.
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Feb 7, 2015
why Java does not support return type in method overloading. I coded following and it compiles and runs without any errors.
class Ideone
{
public static void main (String[] args) {
sum(3,5);
[code]....
If Java did not support overloading based on return type, this program should not work, right?
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Dec 26, 2013
I need to port asynchronous bean (provided by websphere) support in App servers like weblogic and jboss. Is this feature already part of J2EE specification? Or should I use some other external package to get this feature?If so what are those async bean like features for weblogic and jboss?
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Mar 29, 2014
I want to use google translate api to translate language from one language to another...
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May 12, 2014
Which of these is not a real differentiator for programming languages:
a) Object-oriented / Process-Oriented
b) Interactive / Automated
c) Interpreted / Compiled
d) Strongly-Typed / Weakly-Typed
e) All of the above
f) B and C
g) B and D
Almost all support OOP, Interactive/Automated, Interpreted/Compiled but not sure about Strongly typed/Weakly typed.
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Apr 4, 2015
I have a class called "HelloController" and it extends SimpleFormController. I have the following method inside of HelloController.java:
protected Map referenceData(HttpServletRequest request) throws Exception {
Map<String,String> language = new dHashMap<String,String>();
language.put("Spanish", "Buenos Dias");
language.put("French", "Bonjour");
return language;
}
How would I create a JSP file that would accept a language as its input and return a greeting in that language? For example, if the user enters "Spanish", then the user should see "Buenos Dias." If the user enters "French", then the user should a see "Bonjour".
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May 21, 2014
In my Icefaces 3 application I have a ManagedBean ancestor that defines common attributes to those they spread it. Including CSS styles to be apply at the menu as icons depending on whether they are selected or not. Classes that extend the CommonMBean class define styles. My question is what do I have to put in the language experssion styleClass to tell him that the getter to use is that of the parent class.
CommonMBean.java
package com.omb.view;
public class CommonMBean
private String menu1Css = "";
private String menu2Css = "";
[code]....
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Mar 19, 2014
In the servlet class I have:
String name = "James Bond";
Session.setAttribute("name", name);
Why is the attribute name and attribute value the same in all the books I've read. I know one is a string literal and one is an object but must it be the same?
Second thing I'm confused about... let's say I change the servlet code to
String name = "James Bond";
Session.setAttribute("hisname", name);
When I try to access it using JSP:
${sessionScope.name}
it works fine. So what is the point of the first argument in Session.setAttribute() ?
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Jan 18, 2014
I want a java program to find the language of a given text in a program
For Example: If user enters Hello World it should say its english language
And if he enters a spanish language as a input it should say its spanish language and so on....
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Oct 26, 2014
Is there any way to add duplicate keywords (for all java keywords) maybe in a different language such that we can program java in a different language.
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May 12, 2015
I am trying to use a for loop for getting hours for an employee for five days. how to convert my pesodocode into java language so that it will compile. This is what my pesodocode looks like:
begin getHours()
for(index=0; index <5; index++)
get hours **System.out.println()
**inputString = input.readLine()
**plumbersHours[index] = plumbersHours [index] = integer.parseint(inputString)
endfor
index = 0
while (index < 5)
totalHours + = plumbersHours[index]
index++
end while
return
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May 31, 2014
PHP Code:
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%@page import="Javabean.Articolo"%>
<%@page import="java.util.ArrayList"%>
<%@page contentType="text/html" pageEncoding="UTF-8"%>
[Code] .....
I'm using Netbeans with glassfish server 4. When i try to launche the web page, i see that "nome" is not printed... Why? My older projects that uses EL, still works fine, while this wont' parse the syntax... why??
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Oct 30, 2014
Below is my code
<%--
Document : closeAc
--%>
<%@page import="javax.swing.JOptionPane"%>
<%@page contentType="text/html; charset=UTF-8" pageEncoding="UTF-8" import="java.sql.*, java.util.Date;"%>
<%
try {
request.setCharacterEncoding("UTF-8");
response.setCharacterEncoding("UTF-8");
[code]....
All I'm trying to do is to search the data from the database and is doesn't show up!
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May 25, 2014
Looking for some simple use cases for servlet filters other than tracking requests ? I was thinking of using a filter to filter out offensive language from entered text. Would that be a good use case ?
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Jun 6, 2014
import java.util.Scanner;
public class Exercise1{
public static void main(String[] args) {
String employeeName, employeeNumber, position, department ;
double otpay, salary, deduction, hrs, rate ;
Scanner input = new Scanner (System.in);
[Code] ....
That's my codes but its wrong according to our prof. it should be in frame form. i don't know how to do it since i did not encountered framing since i was started in java.
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Apr 28, 2014
I created a GUI using Java with Buttons, Pictures and labels.When one of the buttons is pressed it increases the price, which can be seen by the labels increasing the necessary amount.What I would like to be able to do in my GUI is allow the user to record details of the sale and be able to display the sales of past customers to date, by this I mean when I click one of the buttons it will record the amount of that item into a file and when I press the another button, not the same button as the items, it will show the user the existing orders that have been taken in the past.
Here is my Code:
//Importing needed classes
import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
[code]....
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Sep 16, 2014
I have a class (WriteExcel) which writes to an excel file. For those who don't know, Excel doesn't handle multiple access well (or at all).
I then have another class (WriteManager) which creates a new thread for each write command, and then calls a method from the WriteExcel class.
Other classes in my project calls methods from WriteManager to send their requests. My situation looks like this:
1) Thread 1: Someclass -> WriteManager.write1stPage(write) -> Creates Thread 2 -> WriteExcel.write1stPage(write) -> Start Excel Write
2) Thread 1: Someclass -> WriteManager.write2ndPage(write) -> Creates Thread 3 -> WriteExcel.write2ndPage(write) -> Start Excel Write
3) Thread 1: Someclass -> WriteManager.write3rdPage(write) -> Creates Thread 4 -> WriteExcel.write3rdPage(write) -> Start Excel Write
4) Thread 2: Finished writing and ready to save -> Throws exception due to multiple Excel access
5) Thread 3: Finished writing and ready to save -> Throws exception due to multiple Excel access
6) Thread 4: Finished writing and ready to save -> Throws exception due to multiple Excel access
I need to figure out a way to restrict access to WriteExcel until the writing is finished. So I need something like this:
1) Thread 1: Someclass -> WriteManager.write1stPage(write) -> Creates Thread 2 -> WriteExcel.write1stPage(write) -> Start Excel Write
2) Thread 1: Someclass -> WriteManager.write2ndPage(write) -> Creates Thread 3 -> Waits Until WriteExcel is free
3) Thread 1: Someclass -> WriteManager.write3rdPage(write) -> Creates Thread 4 -> Waits Until WriteExcel is free
4) Thread 2: Finished writing and ready to save -> Saves and frees WriteExcel
5) Thread 3: WriteExcel is free -> WriteExcel.write2ndPage(write) -> Start Excel Write
6) Thread 3: Finished writing and ready to save -> Saves and frees WriteExcel
7) Thread 4: WriteExcel is free -> WriteExcel.write3rdPage(write) -> Start Excel Write
8) Thread 4: Finished writing and ready to save -> Saves and frees WriteExcel
What is currently the best approach in java for handling this sort of situation?
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