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❓︱qotw-answers

asdru

9/16/2024

keeping track of clients connected to server

i have a server class that implements the runnable method, and i want to keep track of the clients connected to it so i can disconnect all of them via server class method. I've seen that a common practise is to use clientHandlers that are Runnable so that each client can run concurrently with the others, but i still dont get how to store the connected client object to the server (if its even possible)...

bambyzas

9/16/2024

how to test my scheduled methods locally?

hey guys. so i have java spring app. in the app i have a 2 methods annotated with @Scheduled and each method has 2 cron expressions (one for work days, one for weekend). i deploy my app to the server. and on the same server i have cron jobs and thats how my code is being scheduled. but my question is how to locally test if my cron jobs for these two methods work fine?

bambyzas

9/16/2024

how to properly update spring version?

hi guys. i have java project and current spring version is 2.2.6. i need to update the version to the newest. as i understand its 3.3.3. so i have a couple of questions; 1. since i use gradle, i just need to change the version here? ``` plugins { id 'org.springframework.boot' version '2.2.6.RELEASE'...

Milk Packet

9/15/2024

Spring Boot Oauth Login error

Im getting a

java.lang.IllegalArgumentException: Invalid character found in the request target [/login?error=[authorization_request_not_found] ]. The valid characters are defined in RFC 7230 and RFC 3986

error when I try to login with google oauth setup on my spring backend. Here is my security config and oauthsuccess handler https://pastebin.com/raw/wKCKjxnN any help, please?...

Milk Packet

9/15/2024

Spring Boot Google OAuth error

Im getting a

java.lang.IllegalArgumentException: Invalid character found in the request target [/login?error=[authorization_request_not_found] ]. The valid characters are defined in RFC 7230 and RFC 3986

error when I try to login with google oauth setup on my spring backend. Here is my security config and oauthsuccess handler https://pastebin.com/raw/wKCKjxnN any help, please?...

rainymc_

9/15/2024

No response.

I'm currently working on a simple program that takes user input to create a gorcery list with prices and item names. It's not giving me any error codes when I run but rather nothing is appearing. I'll attach a photo below.

CJ__47

9/15/2024

I want to understand the need of keys in JPA (beginner)

Hi , Jpa entity in java to me is an interface for Database operations for classes . But , I don't understand need of defining primary key/foreign key in entities. It could be managed by database engines. To me , it seems like Database is a Data at rest concept while Entity is a data in transit concept...

blue

9/14/2024

Why do I need the abs method

deleted-user

9/14/2024

Rock paper scissor

So I made a rock paper scissor game (im a beginner) and tried making it as simple to read, clean and professional as possible using methods (i didn't make classes because its a simple program) The program handles almost every type of error that can occur (I think) What else can I improve in my program? or is it good ...

Bhuvi

9/13/2024

Kerberos, SSO authentication doubt

I have an internal Java 17 spring-boot application with SSO validation using Kerberos and SPNEGO. Our setup includes the following: AD: Azure AD KDC: Multiple (Local) Application Host Server: Azure cloud...

frink5714

9/13/2024

What is inherited from ?

how do I find out which class is inherited from this I don't have anything

Tomasm21

9/13/2024

I try to write JUnit integration test and to test whether service method works well. It isn't.

This is the service class:

stapps

9/13/2024

Cants seem to get java to recognize a text file.

I cant seem to get java to recognize a text file

rainymc_

9/13/2024

Total price program

I've been trying to code a program that takes in user input to input it into an arraylist. I'm not sure what is going on here or why there are errors.

CJ__47

9/12/2024

Beginners doubt on JPA entity foreign mapping

Hi I am new to jpa's and am learning of foreign key mappings between two table. I need resources to learn on Jakarta JPA manytoone mappings. ...

bambyzas

9/12/2024

how to return multiple objects in SOAP webservice?

hey guys. im developing SOAP webservice in java and i have a question. there are two operations checkId and createSale. and there are CheckIdRequestDTO, CheckIdResponseDTO, CreateSaleRequestDTO, CreateSaleResponseDTO. when validating checkId request and there are some errors, i set needed CheckIdResponseDTO fields to needed values and return the DTO and everything is fine. so my endpoint returns CheckIdResponseDTO in both cases: if its ok, or theres an error. But now im having trouble with createSale request. im validating CreateSaleRequestDTO, and if theres an error i dont have anything to return. I was thinking about constructing something like CreateSaleRequestErrorDTO. but then my endpoint cant return it. this is my endpoint so far: ```java @Endpoint @Validated public class PerlasEndpoint {...

bambyzas

9/12/2024

what data type to use for storing ids?

hi guys. in java code i will need to use/store ids, that look like 11000000035. what data type to use? long or just String? because int in my case doesnt have enough storage for symbols. thanks

bambyzas

8/16/2024

exception handling in SOAP webservices

hey guys. i have a question about SOAP webservice. i have this piece of code in my service layer: ```java Optional<Customer> customer=customerRepository.findById(Long.valueOf(perlasIdCheckRequestDTO.getUserId())); if (customer.isEmpty()) {...

bambyzas

8/16/2024

SOAP service returns 404

hi guys. im developing SOAP web service. but when i call it with SOAP UI, i get ``` HTTP/1.1 404 X-Content-Type-Options: nosniff X-XSS-Protection: 1; mode=block...

Tusya <3

8/16/2024

Any ideas how to render images in console?

Im writing cli application and was kinda inspired of super file It can preview images in fs (example is bellow) So, i decided to implement smth similar Any libs for that?...

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Java Community | Help. Code. Learn.

With more than 20,000 members, join one of the biggest and most active Java Communities on Discord! ☕

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With more than 20,000 members, join one of the biggest and most active Java Communities on Discord! ☕