current i am working to my school project using android studio, it is an attendance system where I store my data to Firestore and the user are able to download/export the data to become Excel file. What I am trying to do is how can I get the all data in a single document of a Collection in firestore here̵…
Tag: java
Change the mouse cursor when shift key is pressed
I have a subclass PointPanel of JPanel, where I want to implement the following behavior: If the mouse hovers the instance and the shift key is pressed, the mouse cursor changes to the hand cursor; if the shift key is released, the mouse cursor changes back to the default cursor. In order to achieve this, I t…
Java servlet request working correctly only for first of multiple auto generated html elements
unfortunately this is a project for school and most of the variables are in my native language, i’ll translate any if needed, but leave the code as is, just in case that’s somehow the problem. I’m making a web app for a Catering Service, using Java servlets for my backend and JSP for my fron…
Get key and IV values using Bouncy castle
With the below code i am using to do get the parameters required for AES encryption: s_key is the file provided which contains the key that will be used to encrypt and decrypt How to segragate the Key and other parameters (IV and Salt) from ParametersWithIV and print to console?? Answer Passphrase and salt ca…
Filter Key from a hashmap Map<String, List> when a string matches one of the elements in the list
I’m fairly new to java in general so help is very appreciated. I have a structure like this: This hashmap has values like this: I’m trying to filter the key of this hashMap when one of the elements matches an element of the list. I’ve tried this so far based on similar solutions I found: I e…
Handle java.lang.NullPointerException in scala when accessing nested fields
I have a use case where Person.getSister().getname() gives java.lang.NullPointerException since Person.getSister() is java null What is the right way to do this in scala. I am able to achieve with below code. But looking for more scala way of doing it. Edit: I changed the code in the following way Answer Chec…
Java JSONArray appending elements again after JSP page reload
Folks, I think I am doing something wrong here. My purpose is to get info from DB into a JSON array that will later be used inside a JS calendar to show some events on a daily basis. The problem I am facing is: When I first log in to the app and see the calendar, all is good, I
Planets won’t render when using for-loop in libgdx
I am running an N-body simulation (testing with three planets at first) and it appears when I use a for-loop to do so, all of the planets don’t render and while debugging i found out they don’t even have an address. However, if I manually type in the movement of all three planets it works. Here…
Where is the parameter in this spring bean comming from
I am new to Spring and need to use the circuit breaker pattern, so I looked at the Spring Cloud Circuit Breaker project and saw this code where is the factory coming from? is it injected? The project where this code came from is here demo cheers, es Answer There is nothing injected. The methods return a new i…
Order between @ControllerAdvice and custom Aspect
tl;dr How can I define the order of custom aspects and the @ControllerAdvice? Detailed description I want to decorate various methods (like normal REST-Calls or a @JmsListener) with MDC information on controller-level. The idea is: I, as a developer, don’t have to think about the MDC data in my controll…