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Java: Arraylist of Array

I want to make an arraylist of an array of 2 elements. So, I have unknown rows and known columns (i.e. 2). E.g. [{name1, ID1}, {name2, ID2}, …] I also have to return this arraylist. I tried using but don’t know how to proceed. Please advise. Answer When you define a ArrayList must use a class. In …

Android app client Mutual TLS with java server

I’m trying to send https requests to my server using mutual TLS. The server I got working successfully with TLS. But I can’t figure out how to do this on the client-side (Android app). I use spring on the java server. Requests from android app are made using HttpsUrlConnection(). I managed to be a…

How to fix “javax.net.ssl.SSLHandshakeException: TLS Server certificate issued after 2019-04-16 and anchored by a distrusted legacy Symantec root CA”

I got the exception below while connecting to a MQTT Server with Java and self signed certificates. I used VeriSign-Class 3-Public-Primary-Certification-Authority-G5.pem as cacert.pem. The code is for an Linux server but currently I’m programming it on IntelliJ IDEA. The output is: I tried to connect to…

Insert data when selecting a dropdown option, MySQL, JAVA, JSP

well my english is not so good, but i will try to explain me, I have a question about how to make an INSERT query when selecting an option from my dropdown, I explain myself, I have a section to insert a user on my website, and an option to select a profile enter image description here It should be

java.lang.IllegalArgumentException: fromIndex(x) > toIndex(y)

I convert list to Page for display table of candidates with pagination, but I am getting error java.lang.IllegalArgumentException: fromIndex(5) > toIndex(1) How to solve this issue? Answer This exception happens because when computing start of your slice you don’t take into consideration how many obj…

Online Compiler won’t run more than one class

I am using the online compiler “onlinegdp” to run java and I am unable to use multiple files in my programming. The exact same code works on eclipse so I am unsure where the problem is. I don’t know …