Java Class Loading: Performance Impact

java.lang.ClassLoader#loadClass() API is used by 3rd party libraries, JDBC Drivers, frameworks, and application servers to load a java class into the memory. Application developers don’t use this API frequently. However when they use the APIs such as ‘java.lang.Class.forName()‘ or ‘org.springframework.util.ClassUtils.forName()‘, they internally call this ‘java.lang.ClassLoader#loadClass()‘ API. Frequent usage of this API amongst different threads at … Read more

selenium – Getting java.lang.ExceptionInInitializerError at cucumber.deps.com.thoughtworks.xstream.XStream.setupConverters trying to run Tests class

Here’s dropbox_link, if someone wants to investigate. Found myself in a pickle trying to run test scenario, intelliJ throws java.lang.ExceptionInInitializerError at first step, StepDefinition class down below: package automation.glue; import automation.config.AutomationFrameworkConfiguration; import automation.drivers.DriverSingleton; import automation.pages.CheckoutPage; import automation.pages.HomePage; import automation.pages.SignInPage; import automation.utils.ConfigurationProperties; import automation.utils.Constants; import cucumber.api.java.en.And; import cucumber.api.java.en.Given; import cucumber.api.java.en.Then; import cucumber.api.java.en.When; import org.junit.Before; import org.openqa.selenium.WebDriver; … Read more

java – Get specific subclass fields from parent class with many subclasses?

Being able to refactor your Recipe-classes makes a lot easier for you. Just use OOP If you can, you should introduce an abstract method in the superclass with concrete implementations in subclasses: public abstract class Recipe{ public abstract String getIngredientMeasurementFromRecipe(String ingredient); } public class DessertRecipe extends Recipe{ @Override public String getIngredientMeasurementFromRecipe(String ingredient){ return switch(ingredient){ case … Read more

python – How to add permissions for “class UserRetrtieveUpdateDestroyAPIView(generics.RetrieveUpdateDestroyAPIView)”?

I’ve created a model using an abstract user class model class for Online flight ticket booking. I’m new to this so haven’t added many functionalities to it. I’m sharing my model.py, admin.py, serializer.py, view.py. My question: In views.py -> class UserRetrtieveUpdateDestroyAPIView(generics.RetrieveUpdateDestroyAPIView) I want to give access for GET PUT DELETE for only ADMIN and USER … Read more

java – Disable Spring Security config class for @WebMvcTest in Spring Boot

I understand this is a specific question for Spring Boot 1.5 but it seems a bit old. In order to have a successful OAuth2 secured controller unit test running I applied the following steps, kindly notice I used Spring Boot 2.2.6, Gradle 5.x, and JUnit 5. This mechanism should work the same way deprecated ones … Read more

How to pass data to the class of another screen in Flutter/Dart?

I need to pass the value of two variables from one screen to another screen class. I can’t do it. Here is the whole code: import ‘package:flutter/material.dart’; import ‘package:csv/csv.dart’; import ‘package:flutter/services.dart’ show rootBundle; import ‘dart:io’; //My classes import ‘./my classes.dart’; void main() => runApp(const MyApp()); class MyApp extends StatelessWidget { const MyApp({Key? key}) : super(key: … Read more

typescript – Why is class X is not assignable to new(…)=> X error ‘occurring’: “Type X’ is not assignable to type ‘new (…args) => X'”?

I am trying to write a graph library in typescript for my application and I try to make it as generic as possible. However, I encounter this problem of type unrecognition in my code and I am not sure why it is happening. In short, BasicVertex is a concrete child class of the abstract class … Read more