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SMEs, Steer Clear of Microservices!

April 15, 2024

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Software-Architektur July 13, 2023

Double-Entry Bookkeeping

Hi, An error in accounting can be costly. Especially in large companies, where there are many transactions, it is easy to overlook one. And when that happens, I might not even notice it. Perhaps the company is doing much better than the books indicate? Or maybe it’s actually unprofitable? Merchants in the 13th century recognized the problem. A system had to be found that would make errors less likely. They invented double-entry bookkeeping.

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

Softwareentwicklung im Mittelstand July 6, 2023

Can You Start Your Application?

Hi, Many companies utilize modern technologies. Kubernetes, RabbitMQ, AWS, Docker, ArgoCD… and so on. The selection is vast. The CNCF Landscape has arrived in most businesses. But what surprises me: The software is complicated. So complicated that it can’t just be launched locally on a whim. I did not expect that. Docker is deliberately included in the list. Because most of the companies I spoke to use Docker. Many of them in production.

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