Servlet is a Java application programming interface (API) running on the server machine which can intercept on the requests made by the client and can generate/send a response accordingly.

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8
votes
3answers
138 views

Sending a file in servlet response, using a class inside a method

I am processing file inside my method - basically preparing it for the download. But I decided to split actions for setting headers and reading bytes. As Java does not support method declaration ...
3
votes
1answer
52 views

Filter to block duplicate POST submission on server side

I am working on a JSF 1.1 webapp. Lots of POST request take some time and users have the bad habit of clicking again when it takes too long. I am planning to target all the long running processes and ...
3
votes
1answer
136 views

Servlet responses to upload/download requests

My task is to write a program to store files in object store. One of the subtasks requires to send json or xml format response to the file uploader/downloader as requested by client. The following ...
2
votes
0answers
172 views

Authorization token from servlet filter stores user name

I'm having some difficulty with servlet and filter lifecycles. The intention here is to use the front controller pattern with a simple login; authentication is accomplished with the filter. Am I ...
2
votes
1answer
90 views

Open source Pastebin tool made in JSP and servlet

I'm a student and still studying. I just made my own Pastebin tool to generate source code. I've also contributed this project as an open source. You could see this project from here. If you wish to ...
3
votes
0answers
149 views

Exception logger for servlets and JSPs

I hate using unnecessary catch blocks and I like to see my code look beautiful. In most of the cases in my project, which is a web application, I can't declare many ...
6
votes
1answer
98 views

Entering information about a business and finding matches

I'm writing a Java Servlet application where the users must enter information about a business. I'd like to prevent as many duplicate entries in the MySQL database as possible and I'd appreciate ...
0
votes
2answers
692 views

Elegant way to handle errors with JSP and Servlets (Model 2)

I have a form that submits to a registration Servlet, which inserts a new user to the database when they sign up to the web application. Depending on the erroneous user input, the Servlet will ...
4
votes
1answer
298 views

Error Handling in Servlets and JSPs

I have an HTML login form that is processed by a servlet, which then redirects the user to a result page. login.jsp: ...
5
votes
3answers
1k views

Catching NullPointerException in Servlets

I have a servlet that processes user registration to a website. It takes inputs from an HTML form like username, password, email, etc. MySQL Table: ...
2
votes
1answer
51 views

Servlet WebClient: How do I best solve for multiple servlet requests?

This is working code presently visible here. Basically, this is still a work in process, but I do not want to go much further down the road without peer review. I've limited the source to the servlet. ...
4
votes
3answers
829 views

Unit testing a servlet in a meaningful way

I have to write a unit test for the method processRequest in the servlet below and I'm wondering if: It just shouldn't be done. The class should be rewritten / ...
5
votes
1answer
1k views

Single Sign On - SAML Response generation

I am trying to implement a IDP initiated Single Sign On Solution (service similar to onelogin's) to Cloud based Service providers such as Google Apps, Salesforce etc. The project is a Maven eclipse ...
2
votes
1answer
264 views

Mutualising multi-threaded calls to EJB from Servlet

I have a Servlet that makes an EJB call to a backing server which takes about a second to return some data that changes reasonably regularly. I can't cache the data on the servlet-side, so I have ...
10
votes
2answers
728 views

Simple servlet code to sum digits

This servlet takes an input from the user and Stores the number inside the bean but with spaces in between each digit then stores the bean in the request scope. If the last digit is even, sums the ...
8
votes
2answers
566 views

MVC controller code

Please review my servlet. ...
6
votes
2answers
2k views

Implement HTTP Server with persistent connection

I am trying to implement a HTTP Server in Java, I want the server to use a persistent connection per thread for request and response. After some research on Google, this is how my program looks like. ...
8
votes
2answers
373 views

Servlet for querying database on some high-loaded system

What should the code do: Process client HTML requests, query database and return the answer in XML. Working with a high load. I need to know how can it be optimized. Is something terribly wrong with ...
0
votes
1answer
430 views

Please check my example about jquery autocomple with servlet [closed]

Please check my code, did i get some things wrong I'm a newbie in jquery and ajax, please check and show me how to fix this In jsp page : ...
-2
votes
1answer
2k views

file downloading using jsp but not readable [closed]

I am trying to download files using jsp but then downloaded files are not readable. Suppose if i download pdf files then it can not opened,if i download jpg files then it can not opened and similarily ...
1
vote
1answer
205 views

How can I tidy up this servlet parameter check code?

One of the servlet in my web app takes parameters in the form www.service.com/servletname/parameter1/parameter2. The first parameter is required and the second ...
2
votes
1answer
429 views

Am I using appropriate methods in this login system?

I have had to do a crash course in JSP, Servlets, and JDBC. I decided to attempt a Login System. I'm unsure if my use of try/catch is appropriate and if I am closing database connections correctly. ...
1
vote
2answers
839 views

Correct implementation for background task execution in web application?

I have a simple servlet which merely serves some cached data back to the user. I also have a background thread which runs at fixed intervals to refresh the cached data. Is this a reasonable ...
2
votes
1answer
753 views

Tomcat/JSP/servlets web-project refactoring advices needed

I am a newbie to JSP/servlets/java, studying it atm. So I've made my first project. It's a simple sort of array. Array (in fact I used ArrayList) is stored in ...
1
vote
2answers
297 views

Is there a more efficient way of loading views within my java app?

I'm building a web application in Java. I'm new to Java, so before I get too far into this... I'm hoping to take advantage of all the experience here and learn the problems with this setup. My ...
6
votes
2answers
211 views

Handling optional parameters in a servlet

I have a form that submits to a servlet that has optional parameters. If they are empty they are just ignored. This is the template I am using: ...