JSF :: Passing Argument Parameters Between Pages

Jul 19, 2014

So I have an application where the user logs in (using j_security_check). User is taken to a welcome page where user's name is displayed as a link. When clicking that link I would like to take the user to a page where the user is able to update the credentials (password, address, etc). In this way the user only has access to the link related to that specific user's credentials. I am trying the following structure:

The welcome page (adminindex.xhtml) is:

<h:form>
Welcome to admin <h:commandLink value="#{userb.loggedUser}" action="#{userb.selectedUser}"/>
<f:param name="userName" value="#{userb.userName}"/>
</h:form>

The user backing bean:

public String selectedUser() {
userName = FacesContext.getCurrentInstance().getExternalContext().getRequestParameterMap().get(userName);
selUser=uServ.findByName(userName);
return "UpdateUser";

[Code] ....

The last line of the stack suggests that a null PK value is being picked up by the FacesContext method in the backing bean. I'm confused because the userName string IS the primary key of the user table which is structured like this:

CREATE TABLE sha_users
( username VARCHAR(255) NOT NULL
, password VARCHAR(255) NULL
, PRIMARY KEY ( username ) );

I'm sure I'm getting the concept of how to pass query parameters...

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Passing Object Argument To A Method - Unable To Call Methods On Argument

Feb 7, 2015

I am trying to pass an object of type Product p to my editProduct method, however trying to call p.getName(); doesn't work and throws a NullPointerException. The same kind of thing works for my displayRecord method (in a different class) and I can call .getName() on Product p, also passed as an argument to that method. Below is my editProduct class. The NullPointerExcepion is being thrown at line 61 (i.e., nameField.setText(p.getName());).

I don't know if I explained right, so here's a line thing of how the classes relate:

Search >>>(field.getText())>>> displayRecord(Product p) >>>editProduct(p)>>> EditProduct

And as a side note: adding the line p = new Product(); fixes it and successfully runs the class (including the Save and Quit parts) but obviously I want it to specifically refer to the Product I pass to the method.

Java Code:

import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.FocusEvent;
import java.awt.event.FocusListener;
import java.util.ArrayList;
import javax.swing.BorderFactory;

[Code] ....

I'm asking a question because I don't understand how Product p could possibly be null, because the argument is passed through my DisplayRecord class, which also takes a Product p argument and works. In that class, I have declared Product prod = p; and prod is what I am passing to editProduct.

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Mar 10, 2014

Can we pass array as a cmd line argument as follows ?

>java TestRun file[], number
if yes, in the main(), how do we capture this array ?
public static void main(String [] args){
String [] files = args1 ;
// or will it be String [] files = args1[];
}

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May 24, 2015

I am trying to create a class to read data from the JOptionPane. I am trying to create a general procedure and then be able to overload it using the rest. Basically I just want to call the procedure readString with options and without options while verifying that the user entered the correct information.

Java Code:
public class BankIO {
public static final Object[] mainMenu = {"1. Create Account", "2. Delete Account", "3. Update Account", "4. Display Information", "5. Quit"};
public static final String APPLICATION_NAME = "Banking Pro";

[Code].....

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JSF :: Passing Selected Hyperlink Value As Where Clause Argument In Query

Dec 28, 2013

I have a mySql table of PROJECTS, which I am displaying as a list in the index.xhtml. The projectid column contains hyperlinks. When they're clicked I would like the specific projectid row selected to be passed as the query argument into another jsf file (ListProjects.xhtml) which displays all the project values referring to the projectid selected in the index.xhtml. The named query is:

@NamedQuery(name = "Projects.findByProjectid", query = "SELECT p FROM Projects p WHERE p.projectid = :projectid")
index.xhtml
<?xml version='1.0' encoding='UTF-8' ?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml"

[Code] ....

I get the following stack trace. How to correctly pass the hyperlink parameters.

org.jboss.weld.exceptions.WeldException: WELD-000049 Unable to invoke public void com.manaar.beans.SelProjectMgtBean.init() on com.manaar.beans.SelProjectMgtBean@681859ae
at org.jboss.weld.injection.producer.DefaultLifecycleCallbackInvoker.invokeMethods(DefaultLifecycleCallbackInvoker.java:91)

[Code] ....

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JSF :: Passing Parameters From Servlet

Sep 12, 2014

I'm trying to pass a parmeter to a jsf page from a servlet(i.e. associated with paypal adaptive api), but I keep getting the following error, even though the productType on ProductDetailsVO is a String.

INFO: WARNING: FacesMessage(s) have been enqueued, but may not have been displayed.

sourceId=j_idt2[severity=(ERROR 2), summary=(j_idt2: '45;productType=Sport'

must be a number consisting of one or more digits.), detail=(j_idt2: '45;productType=Sport' must be a number between -2147483648 and 2147483647 Example: 9346)]

Calling JSF page contains:-

returnURL = new URL(new URL(request.getRequestURL().toString()),"pages/paypalpaymentapproved.xhtml?paypalID="+paypalID+";productType=Sport");
response.sendRedirect(returnURL.toString());

[Code] ....

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Mar 7, 2015

Using Eclipse. I have this line of code:

BufferedReader br = new BufferedReader(new InputStreamReader(in));

I want to do something with br in a method that I defined. But Eclipse is complaining about br declared as

public static void Get_Next(String next_line, BufferedReader br) {

How do I make this work?

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JSP :: Passing Dynamic Parameters Through Href Tag

Aug 3, 2011

I am trying to pass additional information through <a href> tag

<a href="welcome.jsp & param=<%=add.getID()%>">Welcome </a>

The error is : HTTP Status 404 - /WebApp/welcome.jsp & param=6

The id obtained from add.getID() is displayed in address bar on the browser.

I want to use this id on the next page. I try to use :

request.getParameter("param");

But could not get the ID....

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JSP :: Passing Parameters To Custom Tag Error

May 14, 2014

I am not able to pass parameters to custom tag. This is my tag file header.tag under web-in/tags folder

<img ><br>
<b><i>${subTitle}</i></b>

And This is my jsp page that use that tag.

<%@ taglib prefix="myTags" tagdir="/WEB-INF/tags" %>
<html>
<body>
<myTags:header subTitle="We make sure our clients dont have to do that" />

</body>
</html>

It says attribute subTitle invalid for tag header according to TLD.

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Passing Parameters And Return Statement

Apr 27, 2014

My task is to make a mortgage calculator where the user selects which calculation they want the program to do via a menu. I got the menu to work and it keeps on looping until terminated so that's good. The starts when I want the user's choice (P, I or T) to be used in another method which will then execute another set of code (the calculation that needs to be done). I think passing parameters and return statements are what I need to use, but after reading and watching videos, I'm still not sure how to implement it into my program. For now, I want the user to input the letter "P" and then I want that information to be passed to the method, loanCalculator() where the if statement will make a decision to call the method, calcPayment and display the number 0 via the console. Once it can do that, I'll fill in the calculation methods with the proper code since I can at least navigate the user input to its associated calculator. It just keeps on looping the menu without going through the other methods.

import java.util.Scanner;
//Example of "big loop" in main to repeat using a No Trip (0,N) test first
public class Mortgage {
// constants
static double loanAmount;
static double interestRate;
static int term;

[code]....

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Oct 9, 2014

How to use the id parameter in my documents entity to download documents from a list of documents. Normally I use ListDataModel and the getRowData method. I would like to know how to achieve the same thing using an ordinary List object.

My list of documents is called List<CountryDocs> selectedDocs;

<h:form>
<p:dataTable value="#{countryDocBean.selectedDocs}" var="docs">
<p:commandLink id="download" value="Download" ajax="false">
<p:fileDownload value="#{countryDocBean.downloadedFile}"
contentDisposition="attachment"/>

[Code] ....

Clicking on the download link calls the following method in my managed bean:

@ManagedBean(name = "countryDocBean")
@SessionScoped
public class CountryDocBean {
private List<CountryDocs> selectedDocs;
public StreamedContent getDownloadedFile() {

[Code] ....

Debugging shows the value for the id is 0 and this results in a NullPointerException. I've tried several methods for grabbing the document id in my backing bean, but no luck yet. I also read about the the ViewParams and ViewAction method but they caused validation errors to do with the <f:metadata> tags. I don't know how to obtain this value using a normal List object.

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Dec 14, 2014

For some reason, when I test out my code, my randomly generated numbers don't appear. Here is a sample result:

> What do you want to generate, integer, double, or character?

>integer

>What is the upper limit and lower limit of the integers you want to generate?

>1

>10

>How many integers do you want to generate?

>10

>BUILD SUCCESSFUL (total time: 9 seconds)

Is this because my code is not passing my parameters correctly? I'm not sure how to fix this either.

Here is my code for reference (it's not completed at the moment)

import java.util.Scanner;
public class NewNumberCharacter {
/** Main method
* @param args */
public static void main(String[] args) {
int return_int;
double return_double;

[Code] ....

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when url-pattern is the following, .jsp extension is shown, eg: FileName.jsp

<servlet-mapping>
<servlet-name>Faces Servlet</servlet-name>
<url-pattern>/faces/*</url-pattern>
</servlet-mapping>

but when I change the url-pattern as per following, .jsf extention is shown , eg: FileName.jsf

<servlet-mapping>
<servlet-name>Faces Servlet</servlet-name>
<url-pattern>*.jsf</url-pattern>
</servlet-mapping>

even if I change the url-pattern to abc or xyz, the webpage url is shown in that format. eg: FileName.abc this is the actual scenario to specify extension of a jsf page, or is this an error.

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run:
Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: -256
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at .MemoryProcess.callMemory(MemoryProcess.java:39)
at .main(Lab3.java:29)
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Java Result: 1
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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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<ul>
<%
Random random=new Random();
TreeSet<Integer> ts=new TreeSet<Integer>();
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[Code] ....

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