My 2022 Review

2022 was completely a mind-blowing year for me. Lots of changes happened at work. At present, things seem to be going to settle down, I want to look back at my year.

My balcony (2022)

Q1

At beginning of the year, I started with Metaverse and NFT research. I completed my first course about a new technology Blockchain on brilliant[dot]com which became my best favorite learning platform later on. Getting a certified IBM developer certification was also a good experience. I gained more knowledge of technologies including containerization, microservices, DevOps, and Cloud-Native. It triggered me to plan for DevOps toolchain enhancement for the company. Adopting GitOps practice was a good start. It is one of my main focuses for my position role as a Tech Lead. I was really impressed by the book “The Brief History of Time”. The story of Stephen Hawking was so inspiring. To me, it was one of my favorite books of this year. Sadly, this period was the time when some of my good friends were leaving the company.

Q2

Changing the organizational process was so truly difficult. Lots of discussions have been conducted to have the same voice for a group of people since the new role Engineering Lead was proposed for the change. What I experienced well in this period was that whenever I put my energy into something, all related things will come around me. And, franking is the only medicine to treat toxic sicknesses and environments. I started to sharpen my English pronunciation skills with ELSA speak app. I also spent time reading human management-related books including “The Mythical Man-Month” and “Peopleware”. I also spent a month interviewing for a new role as an Engineering Manager in a startup.

Q3

The role of Engineering Lead was adopted well. Working with completely new teams with new projects was an excellent experience. I have learned to work with new people who don’t have the same mindset as me. As a leader of the new teams, I understand more about the effortless approach to leading people. Getting the Professional Scrum Master (PSM) certificate helped me set up my working style as a Scrum Master with new teams. I affirmed that I should not be a hero but rather that I need to give more authority to the team to be self-organized.

Q4

Still, there were many things happened unanticipatedly. Another good member was leaving the company. It was the first time I joined team HR to define a process of annual performance appraisal. It took a huge time and effort. Some new practices were officially applied as a company standard such as Engineering Levels, OKRs, and the role of Team Lead. I also have experience with leading some development teams working on different projects built with different technologies. Giving clarity of the projects' roadmap for developers was my important job. Moreover, I have learned along with teams to solve different emerging project issues.

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Math fundamentals and Katex

It was really tough for me to understand many articles about data science due to the requirements of understanding mathematics (especially linear algebra). I’ve started to gain some basic knowledges about Math by reading a book first. The great tool Typora and stackedit with supporting Katex syntax simply helps me to display Math-related symbols. Let’s start! The fundamental ideas of mathematics: “doing math” with numbers and functions. Linear algebra: “doing math” with vectors and linear transformations. 1. Solving equations Solving equations means finding the value of the unknown in the equation. To find the solution, we must break the problem down into simpler steps. E.g: x 2 − 4 = 4 5 x 2 − 4 + 4 = 4 5 + 4 x 2 = 4 9 x = 4 9 ∣ x ∣ = 7 x = 7 or x = − 7 \begin{aligned} x^2 - 4 &= 45\\ x^2 - 4 + 4 &= 45 + 4\\ x^2 &= 49\\ \sqrt{x}&=\sqrt{49}\\ |x| &= 7\\ x=7 &\text{ or } x=-7 \end{aligned} x 2 − 4 x 2 − 4 + 4 x 2 x ∣ x ∣ x = 7 = 4 5 = 4 ...

Junit - Test fails on French or German string assertion

In my previous post about building a regex to check a text without special characters but allow German and French . I met a problem that the unit test works fine on my machine using Eclipse, but it was fail when running on Jenkins' build job. Here is my test: @Test public void shouldAllowFrenchAndGermanCharacters(){ String source = "ÄäÖöÜüß áÁàÀâÂéÉèÈêÊîÎçÇ"; assertFalse(SpecialCharactersUtils.isExistSpecialCharater(source)); } Production code: public static boolean isExistNotAllowedCharacters(String source){ Pattern regex = Pattern.compile("^[a-zA-Z_0-9_ÄäÖöÜüß áÁàÀâÂéÉèÈêÊîÎçÇ]*$"); Matcher matcher = regex.matcher(source); return !matcher.matches(); } The result likes the following: Failed tests: SpecialCharactersUtilsTest.shouldAllowFrenchAndGermanCharacters:32 null A guy from stackoverflow.com says: "This is probably due to the default encoding used for your Java source files. The ö in the string literal in the J...

Styling Sort Icons Using Font Awesome for Primefaces' Data Table

So far, Primefaces has used image sprites for displaying the sort icons. This leads to a problem if we want to make a different style for these icons; for example, I would make the icon "arrow up" more blurry at the first time the table loading because I want to highlight the icon "arrow down". I found a way that I can replace these icons with Font Awesome icons. We will use "CSS Pseudo-classes" to achieve it. The hardest thing here is that we should handle displaying icons in different cases. There is a case both "arrow up" and "arrow down" showing and other case is only one of these icons is shown. .ui-sortable-column-icon.ui-icon.ui-icon-carat-2-n-s { background-image: none; margin-left: 5px; font-size: 1.1666em; position: relative; } .ui-sortable-column-icon.ui-icon.ui-icon-carat-2-n-s:not(.ui-icon-triangle-1-s)::before { content: "\f106"; font-family: "FontAwesome"; position: ...

Building Axon.ivy Projects on Bitbucket Pipelines

Read me if you don't know what Axon.ivy (Ivy) is. Motivation - Ivy projects are designed to be built on a continuous integration (CI) server like Jenkins - Today, Bitbucket supports for CI with Bitbucket Pipelines - We're using Bitbucket. Then, why not? It must be very cool and convenient for us if we can centralize our CI and VCS (version control system) tools in one place. Here is an approach We have to use a maven plugin called project-build-plugin to build ivy projects. This plugin requires an instance of Ivy engine during building time. Bitbucket Pipelines allows us to specify our own docker image as a build environment. What we need to do is to prepare our docker image with needed stuffs such as JDK, Maven, Ivy engine, etc. Step 1. Prepare Docker images For testing purpose, I already created two docker images: Maven and Axon.ivy engine. They are now available on Docker Hub This image for Maven using Oracle JDK 8 This image for Axon.iv...

Java Core - Top 10 Questions Every Developer Should Know

#RandomlyPickedByMe What is the difference between Javascript and Java? Difference between StringBuilder and StringBuffer? Why do I get "SomeType@a3fde" when I print my code? Why is String immutable? Why "equals" method when we have "==" operator? Is List<Dog> a subclass of List<Animal>? Why shouldn't we use raw type? Is Java “pass-by-reference” or “pass-by-value”? What's the advantage of a Java enum versus a class with public static final fields? Why "double x = 0.1 + 0.2" and result of print(x) is 0.30000000000000004? 1. What is the difference between Javascript and Java? Holy crap! (Vietnamese: Thế quái nào lại có câu hỏi ngớ ngẩn vậy chứ?) "Java and Javascript are similar like Car and Carpet are similar." - Greg Hewgill (on StackOverflow) 2. Difference between StringBuilder and StringBuffer String is immutable. StringBuilder and StringBuffer are mutable. StringBuffer is thread-safe. String...

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