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Unnecessary Unit Tests

January 12, 2024

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Entwicklungspraxis July 20, 2023

"I think Loom is going to kill reactive programming." ~Brian Goetz

Hi, “I think Loom is going to kill reactive programming.” This statement comes from Brian Goetz . Do you know who he is? Brian has been the Java Language Architect at Oracle for 13 years. He is the author of “Java Concurrency in Practice” - a standard work for every Java developer . He was also the one who brought JSR-335 - Lambda Expressions - into the language. What Brian says has substance. You’ll hardly find anyone else in the world who can provide a better outlook on the future of Java and its ecosystem.

Marcus Held

Entwicklungspraxis July 17, 2023

Surprising Documentation

Hi, Class comments, architecture documentation, method comments, API documentation, inline comments, feature documentation, wireframes, entity-relationship diagrams, use-case diagrams, process documentation, end-user documentation… There are so many things one can document. But what do I really need? Documentation doesn’t write itself. Someone has to take the time. And for it to truly add value, it needs to be well-written, as complete as possible and focused. Not everyone can do that. In large corporations - with thousands of employees - a lot is documented. There are software architects who have the time and education to write good documentation. There are so many developers that enough time is allocated to document the code. And technical writers produce the highest quality end-user documentation.

Marcus Held

Entwicklungspraxis July 10, 2023

Nobody Talks About Project Loom

Hi, “Why isn’t anyone talking about Project Loom? On the JVM, one of the largest changes in years is looming over us. And it will massively influence the way we work. Asynchrony is difficult. There’s so much to consider: How do I configure my thread pool? Does the code path have more wait-time, or does it take a long time to calculate? And how large should the queue be in front of the thread pool? Are spikes in the code path to be expected?

Marcus Held

Entwicklungspraxis July 3, 2023

Are You a Carpenter?

Hi, What distinguishes a software developer from a carpenter? The carpenter produces furniture. The developer creates software. Imagine you go to a carpenter. You enter the workshop, see various materials, tools, finished and unfinished pieces of furniture. The foreman approaches you. He asks you about your preferences. You want a table. With an inset plexiglass top. For outdoor use. Matching your preferences and with his expertise, he selects the right wood. For outdoor use, it needs to be a weather-resistant material. It shouldn’t warp significantly to prevent the inset top from breaking.

Marcus Held

Entwicklungspraxis June 29, 2023

Write your own PasswordEncoder. NOT!

Hi, Have you ever written your own password encoder? I haven’t exactly - but I had to use a homemade one. In a central User-Management-Service, the customer data of all users came together. And in this, the passwords were stored. Thus, when registering a new user, the same encoder had to be used. In practice - fortunately - it did not blow up in our faces. But it was highly critical. The encoding was not strong. The Salt was still based on MD5. Even at that time, it was no longer a strong hashing algorithm. The trivial solution to make it “safer”: Simply apply it twice. No one will think of that 🤦‍♂️

Marcus Held