Java – Page 466 – Java Questions

Java has too many level symbolic links

Well,I was trying to install forge on my linux machine(Kali-Linux).While on the was I was and still am unable to access the forge file(.jar).Due to an issue in which there is a lack of a command called “java”. The current problem I am having is sudo update-alternatives –install /usr/bin/java java /usr/lib/jvm/jdk-16.0.1/bin/java 1 while using this command I get a response

Creating new instance of concrete implementation in interface – is this an antipattern?

dao design-principles interface java

Let’s say I have the interface AuthorDao with two different implementation classes for example MyAuthorDaoImpl1 and MyAuthorDaoImpl2. In my interface AuthorDao I have some basic crud methods and one extra method which is static for getting a new instance of MyAuthorDaoImpl1. It looks like this: Questions Is this static method getInstance() is not an anti-pattern? Because in my opinion we

How I can select an element from a dropdown list?

automated-tests java selenium testing

Problem: I try to select an element from a dropdown list I have a dropdown list with the following HTML code: I try to select the element with the following Java code but didn’t work: How I can select the element,I tried to increase the time in Wait, I also tried with Thread.sleep () but it still doesn’t recognize the

FasterXml – JsonSerializer HashMap

fasterxml java jsonserializer

I’m using jackson-databind version 2.12.3 to serialize the return of an object that should return like this: My classes are these: The return is myObject: However with the default ObjectMapper the “link.setField” is ignored and the returned json is: I tried doing some tests with JsonSerializer but couldn’t do something generic for all classes that extend HashMap (these classes are

Mark row selected on mouse click in vaadin grid(SelectionMode.MULTI)

java vaadin

I have a Grid with a multi-select option. In a normal way when I click in the checkbox the row is selected with the default selected color. But I need to have the same or other selected color when I click in the grid´s row. I have created a CSS: Imported it in my class view: The code above works

CaptainCasa framework: DOF reactOnInstanceSelect conflicting with clickable items in the grid

java jsp

In a few DOF grids I have icons and buttons with click actions added using a DOF extension. I also want to trigger another action when single-clicking on a grid row (reactOnInstanceSelect). I want to avoid triggering the reactOnInstanceSelect action when clicking on the icons/buttons. Right now when I click on a button, both the button event and the reactOnInstanceSelect

400 Bad Request when using Spring Boot

http java rest spring spring-boot

I am sending a Http POST request to my RESTful API build with Spring Boot and get the “400 Bad Request” response. My POST request is made with Postman, send to with the body I want to pass the filename variable to my Java Method. My RESTful api is build in Java with Spring Boot I tried with and with

non-capturing group still shows?

java regex url

I am trying to get the string starting from third / in a url. here is the url: http://192.168.1.253:18888/2021/03/11/896459e4-875f-455a-a2cb-768c879555e7.png I wish to get /2021/03/11/896459e4-875f-455a-a2cb-768c879555e7.png So I used the following regex (?://.+)/.+ ?: marks a non-capturing group, so //192.168.1.253:18888 shouldn’t be matched. But when I test in regex101.com, its result is //192.168.1.254:18888/2021/03/11/896459e4-875f-455a-a2cb-768c879555e7.png. Why is that? Answer The reason the regex101.com result

How to specify role at node level within Akka cluster?

akka akka-supervision java kubernetes scala

Given the following appliction.conf : To discern between the roles within an Actor I use : edited from src (https://doc.akka.io/docs/akka/current/cluster-usage.html) To enable role for a node I use the following config : Within application.conf I configure the array for the roles but this appears to be at the cluster level rather than node level. In other words it does not