I am trying to set a Spring Boot applications context root programmatically. The reason for the context root is we want the app to be accessed from localhost:port/{app_name} and have all the controller paths append to it. Here is the application configuration file for the web-app. Here is the index controller for the main page. The new root of the
Removing user login credentials from session when user logout in spring-security
I am new to Spring and Spring-Security. I have been going through the tutorials here The user are not allowed to hit add employee page without login. So if you hit add employee page, you will be directed to the login page and when login succeeded you are directed to the add employee page automatically. But once the user logged
How to assign a text file’s lines of integers into 2D tables in Java?
I have the sample.txt which contains 100 Integers (range 0-9) in every line formatted like this: I want to scan the file and put every line into a 10×10 table. So: Answer How about something like this?
How to run certain task every day at a particular time using ScheduledExecutorService?
I am trying to run a certain task everyday at 5 AM in the morning. So I decided to use ScheduledExecutorService for this but so far I have seen examples which shows how to run task every few minutes. And I am not able to find any example which shows how to run a task every day at a particular
Calling equals on string literal
I just was tidying my code a bit and there was this piece: Then I thought of doing it the other way around to get rid of the checking for null: It definitely works, but is this safe to do so? I mean string literals are stored in a common pool, while string object create by new are on the
Java fade in and out of images
I am trying to learn how to fade in and out images into another image or from another image. So, if I have 2 images, and 1 is being displayed at the moment, I want to display another image in the background and fade the first image out into the 2nd image. OR, I want to set the focus on
Opening CSV with UTF-8 BOM via Excel
I create csv file with data by the means of java. And I faced the following well-known issue: the letters in Portuguese were displayed by the wrong way in Excel (when opening by double click). I solved this by UTF-16LE+BOM, but excel started to recognize tabs as columns separators instead of commas. So I looked up for another solution and
Simplest way to print an `IntStream` as a `String`
With Java-8 I can easily treat a String (or any CharSequence) as an IntStream using either the chars or the codePoints method. IntStream chars = “Hello world.”.codePoints(); I can then manipulate …
(int) Math.sqrt(n) much slower than (int) Math.floor(Math.sqrt(n))
I was looking at my code, hoping to improve its performance and then i saw this: Oh, ok, i don’t really need the call to Math.floor, as casting the double returned from Math.sqrt(n) will be effectively flooring the number too (as sqrt will never return a negative number). So i went and dropped the call to Math.floor: sat back and
regex certain character can exist or not but nothing after that
I’m new to regex and I’m trying to do a search on a couple of string. I wanted to check if a certain character, in this case its “:” (without the quote) exist on the strings. If : does not exist in the string it would still match, but if : exist there should be nothing after that only space