The HotSpot JVM comes with several "out of the box" tools that can be very useful. jstat and jconsole are two of these tools

jstat can be overwhelming and is more of a CLI approach to monitoring performance across the Java process you are running. You will need to know the process id and recommended that you use the -gc option to only get gc related information.

jconsole is more of a UI / visualization tool that allows you to see snap shots of memory, cpu, thread usage.

How can you monitor garbage collection in Java

How can you monitor garbage collection in Java?

Software Engineer Salary?

remember that these lifecycle hooks are what make Angular 2+ be able to compete with React...

Specifically these life cycle hooks allow data to flow in a single direction (top down).  This was a huge issue with the original Angular and something React got right with flux architecture.

When data changes are propagated from top down, you get more consistent results. Things fall into a hierarchy of updates and can't update each other like "two way data binding" and the original Angular.

So sorry for the tangent, but important to know that these kinds of lifecycle hooks are what make Angular apart of todays client side development conversation.

i think the way Angular handles change events is much simpler than ReactJS.  While these ngonchange examples may seem a bit overboard for JavaScript, it's still easier to understand these life cycle hooks than functional components in React (in my opinion).

Does anyone know what is more performant when it comes to things like React hooks (useEffect, useState) etc and things like ngOnChanges???

Steve Jennings

People often get confused when they see ngOnChanges fire before ngOnInit. At a high level you would assume ngOnInit is the first thing called when a component is rendered.

This post does a good job of emphasizing the fact that ngOnChanges is linked to children components and their bound @Input properties.  When you initialize a child component from a parent, you are setting the component's @Input properties as part of the component's initialization....

A child component's @Input properties are updated even before the component is initialized...

Alexander Joseph

hoopmiester

ngOnChanges example for Angular including latest version example with explanation

ngOnChanges Example | Angular

Apache Commons is a great library and should be used.  BUT i will say it's good to know how to read a csv file without these "helpers" first.  You will be much better off in the long run.

How to read a CSV file in Java with examples including reading  into an ArrayList, parsing a csv file using scanner, reading with a header, and reading by column name.

How to read a CSV file in Java | with examples

This is a configurable property specifying the initial servers to connect to in Kafka.

What is the bootstrap server in Kafka?

i agree that Java is losing popularity, especially with the newer developers.  With AWS cloud functions etc, developers are finding it easier and easier to use languages like JavaScript across the full stack.  You can easily build a full stack solution with JavaScript (React, NodeJs, MongoDb, MEAN, MERN, etc) while Java struggles to compete "across the board".

With that said, Java is here to stay.  If you learn Java and understand it well there will be a place for you in the coding world.

I've heard Go and Swift are giving Java a serious run for it's money in 2021...is this true?

ArchanaK

How do JavaScript arrays work internally?