java – Java

findViewById not accepting type argument even with compileSdkVersion 30

I generally use kotlin for android but my college wants me to use Java. So I created a new java project in android studio. The problem is I don’t want to cast the return value of findViewById() …

Spring Boot Batch – Stop and Start a multithreaded step with CompositeItemWriter

I am trying to stop and start a multithreaded step through Scheduler. But I am getting exception as Caused by: org.springframework.dao.InvalidDataAccessResourceUsageException: Unexpected cursor …

Get all elements in flat format from nested set structure

I need to get the data back similar to flatMap but it is not working in some scenario. Following are the details. Below is the pseudo code class Employee { String name; int age; } Employee emp1 = …

Why does wait(100) cause synchronized method to fail in multi threaded?

I am referencing from Baeldung.com. Unfortunately, the article does not explain why this is not a thread safe code. Article My goal is to understand how to create a thread safe method with the …

Query on parent’s collection – Hibernate Specification

I have three tables created with Hibernate. Product is the parent while barcodes is a collection end price is a child (one to many) of products. @NotBlank private String ref; @ElementCollection(…

Quarkus Reactive – Multiple matching properties for name “security.jaxrs.deny-unannotated-endpoints” Error

Using Quarkus I get the following error at execution time: Caused by: java.lang.IllegalArgumentException: Multiple matching properties for name “security.jaxrs.deny-unannotated-endpoints” …

How to make a class’s constructor unit testable when its instantiating a Guice module in it?

I have the below mentioned class in a library module, which the clients will use to interact with database. I have a public constructor that takes a parameter from the user of this library, but the …

Swap in an array the places which were randomly selected

I have a one-dimensional array [1,2,3,4] and I want to swap two random calculated positions, for example I get position 1 and 4. I want to have a new array that looks like [4,2,3,1]. Does anyone have …

I am not able to traverse to parent window to child window

Below code i was used in Selenium Eclipse, But i get a error shown in this line “String childid = it.next();” I am unable to traverse parent window to child window import java.util.Iterator; …