Marco Molteni - Angular and Java Developer's Tips and Tricks

Angular and Java Developer's Tips and Tricks

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Marco Molteni

Reverse a String in Java

I guess that if you are on this page is because you are preparing for a Java interview. Often this is a question asked during a job interview. In many years of Java development I don’t think I needed to reverse a String very often. Anyway … the ‘official’ method

How to deploy a Java and React webapp in one JAR/WAR

Goal of this post is to produce a JAR (or with minor changes a WAR) that includes a React frontend with a Spring Boot backend. The frontend and the backend can be started separately for development, but only with only 1 instruction you can compile and build the artifact. UPDATE:

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Java 22 new features -notes

Official page and release date The JDK 22 has been the 2024-03-19, it's not a LTS release, will be supported only for 6 months. You can find the list of new features here: https://openjdk.org/projects/jdk/22/ The official release notes can be found here: https:

Angular Signals - Quick introduction

When to use Signals. Are they better than RxJS?

How to validate a Date in DB2

This function verify if a date is valid in DB2 according to a custom date format. -- this function return 1 if the varchar date and 0 if the date is not valid -- the format of the date is passed in the second parameter (ex. mm/dd/yyyy) CREATE

Spring Boot RestTemplate: test GET request with JSON body is not working

I’m building a test for a Spring GET controller. The endpoint accepts a JSON body to avoid a list of parameters (i.e. query parameters). When I try to build the test in Spring I get this error: HttpMessageNotReadableException: Required request body is missing INFO 21697 --- [o-auto-1-exec-1] o.

Swift Playground REST Request

You can run this example in Swift Playground using MacOS. Replace _YOUR_ENDPOINT with the url of your REST Endpoint. // Foundation is required for URLSession import Foundation // PlaygroundSupport: https://developer.apple.com/documentation/playgroundsupport import PlaygroundSupport let url = URL(string: "[YOUR_ENDPOINT]")! // needsIndefiniteExecution is required for async code

JavaScript: copy array. Deep and Shallow clone copy explained

This seems a simple problem to solve. We are working on our project and we need to duplicate an array. This problem presents itself with more frequency if you are using a reactive state manager that uses only immutable objects. In general, we have to know if we need a

Enums in Angular templates

The TypeScript enum can be used directly in your class, but it has to be assigned to a local variable to be used in the template. Declaration example: import { Component } from '@angular/core'; enum LanguageType {Java = 1, 'JavaScript' = 2, "TypeScript" = 3} @Component({ selector: '

Angular CVS generator library

Npm: https://www.npmjs.com/package/@molteni/export-csv GitHub: https://github.com/marco76/export-csv Goal: easily export arrays and JSON data from your Angular or JavaScript application to Excel / CSV Very often in our professional web application we visualise information from a database in tables. A common requirement is to

A simple Node.js REST server simulator for Testing

You are developing a client application (Angular / React etc.) and you need to receive the data from a REST API service. Often you don’t have the access to the remote service or it doesn’t have the required data for your tests (dynamically generated data). A direct access to

Java Server Sent Event - Automatically update web pages

Code source here: https://github.com/marco76/javaSSE How a client (ex. web browser) can get updates from a server? Here some options: 1. Polling The client regularly request to the server new data using a simple request/response via HTTP. 2. Websocket Java EE 7 and Spring 4 implemented