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java-help

❓︱qotw-answers

Konna

2/22/2025

What is wrong with this code?

I need help with my code

robin9944

2/21/2025

Javafx issue

I have been working on a java fx project, but to launch it I have to call it from a secondary main function. Now the issue is it gives me an error that I can ignore but it just is triggering seeing it pop up in the background. I believe it has to do with a missing folder/file but I can't find it

Jordan σ_σ

2/20/2025

Output Characters

Currently confused as to why there are actual "character" blocks being printed out with my String input result. ```java public static void main() { String turtles = convertToWhale("Normal Classes and Turtles be Turtling");...

burritohunterz

2/20/2025

Query with SSM

Hi im trying to write a compiler and initially im focusing on building a simple stack machine code from its corresponding LPL programs. If needed dm me so i can show u my AST classes in my package. There is an error in the terminal but im unsure on how to rectify it pls help.

SidKid

2/20/2025

please clarify this question

is what the first part of this question asking basically to create a few files and then be able to call them up? so maybe following a tutorial like this https://www.youtube.com/watch?v=7fC9nL3_AQQ to create a few files and store them in a List and then be able to call them up from the List?

TGamerboy_02

2/20/2025

Problems in a Cryptography assignment problem

I've shared 3 files which I'm using for the assignment, which are Client.java, Server.java & RSAKeyGen.java. Upon running the command for Client, I get this persistent error: java Client.java localhost 6800 Harish Harish Enter command (ls, get filename, bye): ls...

Lab_06_1.pdf

rangry

2/19/2025

Java

How can java work with syntax and concepts

i hate SQL so much its unreal

2/19/2025

whats the point of OOP encapsulation?

hey guys. i was wondering if smb could help me out? im tired of reading countless articles that are copy pasted from each other so maybe a person and not a bot can explain stuff to me. in all the textbooks its said that "muh encapsulashun" is data hiding (whatever that means), using private fields, getters and setters. so now i have some questions: 1. who are we hiding the data from? lets say i have this: ```java class Book { public String author;...

F4F

2/19/2025

How to combine Left Join Fetch with specification

`public interface PersonRepository extends JpaRepository<Person, Integer>, JpaSpecificationExecutor<Person> { @Lock(LockModeType.PESSIMISTIC_WRITE) Optional<Person> findWithLockingById(Integer id); @Query("SELECT p FROM Person p LEFT JOIN FETCH p.positions")...

i hate SQL so much its unreal

2/19/2025

how does open-closed principle really work?

hey guys. i have a question an id like to hear other opinions. lets say i have this.: ``` public class MyService{ //class fields, getters, setters public myServiceMethod(Car car){...

Suika

2/18/2025

Spring Boot, JavaScript fetching Endpoint

Hi, my method getSeconds() is not invoked. `@PostMapping("/get-seconds") public ResponseEntity<Integer> getSeconds(@RequestBody ModulUpdateRequest request) { log.info("called get-seconds");...

Franscis123$#

2/18/2025

Cannot invoke "jakarta.persistence.EntityManagerFactory.createEntityManager()" "this.emf" is null

I mapped my classes and transformed it in tables for my database. When I try to create a register I get this error. How I should to initialize emf? ``` Exception in thread "main" java.lang.NullPointerException: Cannot invoke "jakarta.persistence.EntityManagerFactory.createEntityManager()" because "this.emf" is null at org.persistence.RolJpaController.getEntityManager(RolJpaController.java:30)...

userexit

2/18/2025

SpringBoot Is it possible to add a Object with it's attributes into another Object using forms ?

To understand better the question imagine ur trying to add a product, u choose it's category and name and description, now u want to add it's productVariants too, is it possible to do this within the same form or should just I use a different one

SidKid

2/18/2025

could you explain what this code is doing in terms of implementing the problem in the picture?

like what is the logic is

Phoenix

2/18/2025

Best Java IDE

I am gonna to learn java, and my current OS is Ubuntu 22.04. What is the best tool or kit for java development?...

SaVage

2/17/2025

Java processing

Im struggling to export this code as svg

Owais123

2/17/2025

Java+Spring VS NodeJs VS GoLang Vs Laravel

Hello to everyone,, great to see a wonderful community totally focused towards JAVA... I had some questions, thought to ask... The question is related to...

DarK

2/17/2025

java language as backend developer

It is sufficient language for backend developer or i have to add multiple languages

alex

2/17/2025

Combine multiple images into a grid format with Java

I am trying to make a 2 x 4 grid view and i need to start arranging images from left to right. i have the paths inside a List<String>

cerealfour39491

2/17/2025

help my code wont run

im useing intellij and cant get this to run

Gaming

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Java Community | Help. Code. Learn.

With more than 25,000 members, join one of the biggest and most active Java Communities on Discord! ☕

Java Community | Help. Code. Learn.

With more than 25,000 members, join one of the biggest and most active Java Communities on Discord! ☕