Charles Chan – Medium

Charles Chan

Spring Boot Testing Signed JWT with a mock Authorization Server

JWT auth config testing in Spring Boot, generate RSA keys programmatically, and conduct rigorous testing for robust security

4 min readSep 14, 2023

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Spring Boot Testing Signed JWT with a mock Authorization Server

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Charles Chan

Java Consultant Tip #2: Use OpenTelemetry Java Agent to learn a new application

Step-by-step instructions on using the OpenTelemetry Java Agent to automatically instrument the codebase with the minimal development…

4 min readDec 20, 2021

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Java Consultant Tip #2: Use OpenTelemetry Java Agent to learn a new application

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Charles Chan

Java Consultant Tip: SSL Certificates and Man in the Middle SSL Proxy

It’s your first day at your new gig. Everything is new and you have to adjust quickly to the environment. However, you notice your favorite…

4 min readDec 9, 2021

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Java Consultant Tip: SSL Certificates and Man in the Middle SSL Proxy

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Charles Chan
in
Level Up Coding

Secure Groovy Script Execution in a Sandbox

Executing untrusted Groovy Script in a sandbox can be a daunting task. This article summarizes my findings and my recommendations.

5 min readMar 18, 2021

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Secure Groovy Script Execution in a Sandbox

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Charles Chan
in
The Startup

Migrate Your Flutter App to Null Safety

Flutter null safety is here. Let’s migrate our programs together to enjoy this exciting new feature.

6 min readJan 23, 2021

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Migrate Your Flutter App to Null Safety

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Charles Chan
in
CodeX

Ghost & Gatsby — A perfect blogging platform

Setup your own blogging platform with Ghost and Gatsby

5 min readDec 4, 2020

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Ghost & Gatsby — A perfect blogging platform

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Charles Chan
in
Towards Data Science

A Simple Text Summarizer written in Rust

This article walks you through the process of creating an extraction based text summarizer using Rust.

8 min readNov 24, 2020

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A Simple Text Summarizer written in Rust

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Charles Chan

Experience with Flutter on Web

Have you heard of Flutter? The next Big Thing? Or the UI framework that’s built for the Fuchsia OS, the OS that is going to replace…

5 min readOct 25, 2020

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Experience with Flutter on Web

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Charles Chan
in
The Startup

Night Vision Camera for Raspberry Pi

Have you ever wonder what goes on in your backyard when you are sound asleep? This simple setup will reveal everything to you.

4 min readOct 8, 2020

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Night Vision Camera for Raspberry Pi

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Charles Chan

Node + Java Docker Image for Raspberry Pi

Simple Docker image for a Node + Java environment.

2 min readMar 23, 2020

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Charles Chan

Charles Chan

A seasoned consultant specialized in Software Development and Architecture. Charles also loves to tavel, follow him on https://www.gorestrepeat.com/

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