Servlets :: Possible To Use Annotations?

Aug 10, 2014

Is it permitted or possible to use annotations on classic servlets?

E.g.:

import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
import java.util.*;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;

[Code] ....

I tried to visit my webapp with /appinfo appended after the context url but I get a 404 and I see no errors in the GlassFish4 log.

My project is using JSF 2.x with the viewservlet mapped on *.xhtml and it is using Spring Beans as well (using the Spring Context Loader), mapped to /rest/*. Do I need to map something else?

I can only get this servlet working without annotations but only using the old web.xml way.

I don't know what I need to do to get my servlet working with annotations.

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Custom Annotations And Spring MVC

Jan 23, 2015

I'm running spring MVC on a tomcat server and am fiddling around with beans and annotations.

First, I have a class Library, with a registerBook(<T> Book) method. This one is annotated with @BookRegistry

Next, I have an Interface Book, which basically is a bean with some custom methods.

I will create different types of books that implement my Book interface and annotate them with @LibraryBook

Now, I want to have spring to check for all beans with @LibraryBook at server startup and run registerBook for each and every one.

How do I accomplish this?

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How To Use Annotations - Limitations And Possibilities

Jun 20, 2015

I was just programming, when I discovered that you can create custom annotations. So I was wondering: what can I use these for? I a m also curious about what the limitations and possibilities are and what to put in the program.

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EJB / EE :: Bean Annotations And Unit Testing?

Mar 6, 2014

I have a bean that represents data been collected from a form on a jsp page. Currently I would like to validate my fields and write some test cases for them. As you can see from my test case example I test a string in the hope that it fails because it contains only one letter. My problem is my unit test is passing. The reason this is from what I can tell is that at runtime it fails when I try to persist my object using my entity manager. During my unit test I just I don’t call my entity manager I just try and set the field.

What I thought would happen was that when I use my bean fields set method the annotations would be checked and fail at that point. Hence why I expected my unit test in this case to fail.

What I would like to know is

1.Are annotations specifically designed to validate when I persist my object and am I using them incorrectly at this point?

2.Is this the best method to use to validate fields, is there a better way, should I write my own code to validate for me when I set my value?

a. Should I throw an exception from the set method of each bean field?

Unit Test:

@Test
public void testName(){
Human h=new Human();
try {
h.setFname("a");
} catch (Exception e) {
// TODO Auto-generated catch block
fail("failed");
e.printStackTrace();

[code]....

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Servlets :: How To Get URL Of JSP Page

May 20, 2014

I am trying to use iText to create a PDF document. I found a nice tutorial online but one thing stumps me. How do I get the URL of the JSP page that contains the content? Since this will not be static, I don't want to hard code this. I am sure this is something simple but I am fairly new to servlets and JSP.

String File_To_Convert = "test.htm";

How do I get the url of the JSP page?

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Servlets :: Not Mapping To URL

Feb 4, 2015

I have a servlet that is not mapping to my URL:

<servlet-mapping>
<servlet-name>view</servlet-name>
<url-pattern>/View/*</url-pattern>
</servlet-mapping>

When I try to call the Servlet from a JSP:

<a href="/View/viewFlow?V1">V1</a>

The resulting link is [URL].... It's bypassing the project name. The link should be [URL]...

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Servlets :: How To Map Website URL

Nov 25, 2014

I have my mapping as below

<servlet>
<servlet-name>main</servlet-name>
<servlet-class>co.edureka.controllers.MainController</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>main</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>

So that I can map the first request coming say www.xyz.net to my first page , it does the work but some of my css and images is not getting displayed .

So I did as below

<servlet>
<servlet-name>main</servlet-name>
<servlet-class>co.edureka.controllers.MainController</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>main</servlet-name>
<url-pattern>/first</url-pattern>
</servlet-mapping>

By doing this my css and images get displayed and everything works fine.

But the problem is I want to display my first page as user puts the url.

I am putting my jsp pages in WEB-INF/jsps , I am not putting it directly under WEB-CONTENT directory.

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Servlets :: Need To Set Up A Server

Dec 20, 2014

I am new to Servlets and came across it in Head First Java 2nd Edition. I wrote the servlet code. I don't know how to run it. Do I need to set up a server?

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Servlets :: Sessions Within Same War

Aug 14, 2014

Suppose we have two servlets runing inside same war on same server. When user access servlet A and create a session, he then open another tab or browser to access servlet B (session created by servlet A still exist). Inside servlet B, does

request.getSession()

return the session created by servlet A ?

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Servlets :: How To Use Session

Apr 16, 2014

I'm trying to go back to basic and strengthen some of my foundation. I'm wondering what kind of data would be appropriate to be stored inside a session? My app is a web app where all the users are the employee of a company. So it's an web-based app that keeps track of stock movements, purchasing and sales order (standard distributor company). The web app interacts strictly with employees, so no public facing app (yes, that's right, no shopping cart). So, in this kind of web app, what kind of data that by storing it to session.

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Servlets :: Calling JSP Page

Mar 25, 2014

I am calling a jsp page from my servlet using the requestdispatcher.forward(myjsp.jsp) method. myjsp.jsp is creating a new thread which is parallely processing along with the servlet. The issue is that the jsp page is not displayed until the servlet finishes its execution, although the new thread is created by jsp and is executing in parallel. How do we have the jsp page displayed even when the servlet is executing.

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Servlets :: Redirect After Login

Jan 30, 2014

I have a secured Struts application in WebSphere that uses FORM j_security_check for authentication.There is also a Post Logon "filter" defined which runs some code after a login is processed.The extract from web.xml showing the login configuration and filter is as follows:

<login-config>
<auth-method>FORM</auth-method>
<realm-name>MyRealm</realm-name>
<form-login-config>
<form-login-page>/login.html</form-login-page>
<form-error-page>/error.html</form-error-page>

[code]....

If a user isn't logged into the application and they try to access one of the secured servlets, for example quotes.do, they are directed to the login page to enter their information.If they login successfully, they are then directed to quotes.do, rather than the default "welcome" page. Is there a setting in the web.xml or the post logon filter where I can force j_security_check to ALWAYS go to the default welcome page after a successful login?

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Servlets :: URL Encoding And Decoding

Jan 29, 2015

I need to encode the URL in order to prevent XSS security threat. I don't have to encode the complete URL, I just have to encode the values for query string. How to encode only the values of query string parameters and change it in the URL itself using java. I am planning to do this in a filter.

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Servlets :: Checkbox Not Working Right

Jan 22, 2014

I am trying to finish this servlet that adds a new course to my courses display. im using a check box so the user can pick what the prerequisite are for the new course they want to add. so if they check cs201 , it will add cs201 as a prerequisite for that new course.

for some reason my checkbox will only add the first checkbox that is clicked. like if i add a subject , and click the check boxs for cs203 , cs202, and cs201. it will only grab cs201 and add it to my course display. it wont grab all 3. how can i grab the other info thats checked?

package cs320Homework1.servlet;
 import java.io.IOException;
import java.io.PrintWriter;
import java.util.List;
 import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;

[Code] .....

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Servlets :: URL Routing Without Using A Framework

Feb 18, 2015

I am seen that ASP.NET apps have a handy feature called URL Routing. How will one implement this in Java without the use of heavy frameworks like Spring MVC ? How do you even begin writing a URL Router if there isn't anything available?

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Servlets :: How To Convert Into Jsp Page

May 22, 2014

I have to convert servlet into jsp. but i dnt know how to convert servlet into jsp.This is my Servlet

package com.example.imagecalculation;
import java.awt.List;
import java.awt.image.BufferedImage;
import java.util.ArrayList;
import java.util.Iterator;
import java.io.File;

[code]....

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Servlets :: Requests Interfere With Each Other

Jun 17, 2014

I did a Servlet and a JSP with a combobox. I called the JSP on one browser and selected value n1 from the combobox. From another computer, I called the (same URL) and selected value n2. I expected the Servlet to handled both requests separately, however when I select value n2 on the 2nd browser, the jsp on the 1st browser that initially had value 1, now changes into value 2 as well.

Why cant the servlet handle requests separately? users actions on different browsers should not interfere with each other..!

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Servlets :: Reload Particular Div Tag Of JSP File?

Jul 9, 2014

Can I reload a particular div tag of jsp file from servlet?

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Servlets :: Online Examination App

Jun 30, 2014

I am trying to build a basic online exam app.But not able to find out how to do that.So user will log in , click on start exam That will be handled by servlet , servlet should call Model class that will fetch questions from database and make a list of those questions and return it to servlet.Than servlet will set that list as an attribute.

and redirect to jsp , which will have three buttons previous ,next ,finish.on clicking on finish I will call servlet wichich will calla model class which returns users score and then servlet redirects to result.jsp.Is this way is right ?

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Servlets :: Which Framework To Choose

Aug 11, 2014

I have good knowledge of servlet,jsp. I've also worked on mvc pattern and now looking to learn a web framework but i'm not sure which to choose between spring mvc OR struts.Should i first do struts and then go for spring or can i choose spring directly?

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Servlets :: How To Obtain Contents Of Td

Mar 19, 2014

i have created a table in jsp, i want to obtain the contents of a td at the servlet.For example, here's one td of table:

<td align="center" title="tdun" id="cat"> <%= categoryname %> </td>

I want to get this value in my servlet .

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Servlets :: Getting Path Of The Base URL?

Feb 5, 2014

I have a data.json in my J2EE web app.I need to load it either from local path when unit testing or from url when the server starts up.

so I've set it to get the local path by default and what I'm trying to do is that it is is running on a server, I'd like to change the path to a url.

Here is my code:

public String getUrlBase(HttpServletRequest request) {
URL requestUrl;
try {
requestUrl = new URL(request.getRequestURL().toString());
String portString = requestUrl.getPort() == -1 ? "" : ":" + requestUrl.getPort();
return requestUrl.getProtocol() + "://" + requestUrl.getHost() + portString + request.getContextPath() + "/";
} catch (MalformedURLException e) {
e.printStackTrace();
}
return null;
}

which works fine. The only issue is that I had to place this in the login page. Is there a way I can only set the path to the base url upon server start up?

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Servlets :: Front End JSP Conforming To SQL

Sep 24, 2014

A data entry form is on the front end. This allows one to enter say emails, addresses, etc. It utilizes a jsp, jstl, servlets, and beans. The backend sql has say a size of 50 for email. If more than 50 char are entered on the form, w/o any intervention, a truncation error is thrown. A static class was set up to hold the input element names and max sizes. It seems to work well keeping all in check, names and sizes on form, names in servlets, size of sql.

servlet
req.setAttribute(elementname, elementobject)
jsp
maxlength="${date.maxLength}"
name="${date.inputName}" //setattribute objects

servlet
.getInputElement("date").getInputName() //static map...shared with above objects

Is there any other system of keeping everything in sync. I am building it all, but I was wondering how this is parsed out if there are separate sql, middle-tier, and front-end developer? It seems better just to have good documentation that would be shared between the different implementers.

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Servlets :: Filter Not Being Called

Nov 10, 2014

I have Filter that is randomly being called and randomly not being called without any logical reason...The mapping is very simple:

<filter>
<filter-name>MyFilter</filter-name>
<filter-class>com.me.MyFilter</filter-class>
<init-param>
<param-name>ignorePaths</param-name>
<param-value>res/</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>MyFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>

[code]....

So, init is called, so it works... but most of the time the doFilter method is not being called at all... what am I doing wrong?

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Servlets :: What Is Need Of Response Object

Feb 19, 2015

Inspite of not returning anything, what is the purpose of response object in servlet? I have typically used or heard of only response.sendRedirect()

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Servlets :: How To Move To Another JSP Page

Mar 27, 2014

I have created a authentication servlet as follows :

protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

// TODO Auto-generated method stub
/* Connexion la base de donnees */
try {
Class.forName("org.postgresql.Driver");
System.out.println("Driver O.K.");

[code]...

I just want to know how can i move to another jsp page from my servlet.

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