servlet-spec | Issue Tracker for the JCP Standard Java Servlet | REST library

I'm making an application that has two values and it returns a lot of different function answers (addition, subtraction, div, multiplication, etc). It's made using JSP and I have an Index and an error JSPs. When I try to run the app with the error.jsp enabled, it always returns that page no matter what I try, because there's something wrong in my code but I don't understand what. The application also has a prime number section, in which you can enter a number, pressing ok and if the number is a prime nothing happens, but if it isnt then you will get an error message. Next prime and previous prime just returns next and previous prime numbers from the number you entered.

index.jsp

Just a note, this is for class. I would go to the class material, but it doesn't address this(the school is kinda garbage). And when i ask the teacher, he says to google it. I've tried googling it, but my understanding is not good enough yet sadly.

My setup is as follows. Its a web application that uses DerbyDB, Glassfish 5, Java and javascript servlets.

I know this is answered 100000 times on here, but being as dense as i am... i am not getting it. i have a java web application (without maven). The login uses login.jsp and authenticates through authenticate.java of course there is no escaping so its vulnerable to xss. I am just not sure how to implement this. If someone could guide me there. If there is a library or something to load and if so how to use it.

login.jsp

Just a note, this is for class. I would go to the class material, but it doesn't address this(the school is kinda garbage). And when i ask the teacher, he says to google it. I've tried googling it, but my understanding is not good enough yet sadly.

My setup is as follows. Its a web application that uses DerbyDB, Glassfish 5, Java and javascript servlets.

I am a bit lost on using Prepared Statements. My Authentication java code has an sql inject vulnerability and i am trying to solve it. Everyone says to use PreparedStatements, so i am trying. My code is below. This is how it works though. It checks the usernames(an email)that was input to the user_id from thesdev_users table. then it takes the user_id and checks it in user_info table to the password stored under the user_id to see if it matches.

The prepared statements are at the bottom, but i figured yall would like to see the full thing, just in case! Authenticate.java

I can't figure out why my jsp page won't display a list I created in a servlet and added to the session. Any help would be greatly appreciated. I've looked at a lot of answers but I can't find one to fix this.

The output I'm getting is;

Summary of artist information

So the table headings are being displayed but not the actual values.

Artist Class

I can't get my index.html file to call my getEmployees.java servlet and I don't know why it's not working because im using the servlets url pattern. The getEmployees method is then supposed to forward control to the listEmployees.jsp file.

The error occurs when I click the hyperlink in the html page;

HTTP Status 404 - /getEmployees

type Status report

message /getEmployees

description The requested resource is not available.

Apache Tomcat/8.0.3

And the code;