Straightforwardly, the same application has been realized twice using different languages: JavaScript (Node-JS) and Java (Spring-Boot) with performance measuring executed in varied environments.

All the code including deploy (Docker-Swarm) and testing environment (JMeter) is available at https://github.com/GaetanoPiazzolla/spring-boot-vs-node-js free for you to play with and customize.

Index:

1. Application and test description — what are we measuring and how
2. Results and conclusion

APPLICATION AND TEST DESCRIPTION

We will evaluate the performance of four REST JSON endpoints:

1. /find-all — Gets an increasing number of items from the DB
2. /save — Persists a new item on the DB
3. /get/{id} — Get an item from the DB
4. /cpu/{load} —…

They found the hanging body on a sunny Monday afternoon. The screen was still displaying the last assigned task regarding a bug fix — misty, convoluted sentences without significance.

In the career of a developer this is a common part: the will to take an end to our pain. Suicide is never the answer — maybe we can reduce suffering related to bug fixing tasks using HAR files.

Content of the story:

1. What HAR these — a definition about HAR files and how them can help us fixing and reporting a bug;
2. Generate a secure HAR file — using your…

In the next six sections there is my point of view about the 6 main DOWNSIDES of microservices development — and what I think could be done to reverse some of them to UPSIDES.

1 — KNOTTED REMOTE CALLS

Kubelinter is a free, open-source CLI used for checking Kubernetes files against several configurable best practices. This project has been brought to life by StackRox.

Environment: ~1GB text file with ~6 million rows.

Let’s start from the easiest one; the standard “read all files in memory and search there”. Of course, the limit here is the total amount of RAM ( or in Java's case, XMX) available.

Total response time: 5.15 seconds

Not so bad but not so bright. Let’s keep going.✔️

Another method could be to use the standard java.util.Scanner. In this case, the file is not kept in memory but read one line at a time.

Total response time: 15.91 s

Wow, that’s bad. Solution rejected.✖️

Let’s do another jump in…

Every developer has had this experience: the software works fine in the local environment, but when the same version of the software is installed in the production environment, nothing works anymore.

How can this be possible? It’s the exact same version! It has to be the environment. So you spend hours trying to understand the difference between your local environment and the production one. And when you finally find it, it always turns out to be the tiniest thing. It might be a stupid environment variable that was initialized incorrectly. …

This is an elaboration of the original article for python written by Tobias Schlottke

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TL;DR: check this Github repo.

Note: The first input is the File Image. Then, for every step, the input is the output of the previous one.

1- Convert your QR code into the actual text

You will need https://github.com/zxing/zxing library:

<dependency>
    <groupId>com.google.zxing</groupId>
    <artifactId>core</artifactId>
    <version>3.3.0</version>
</dependency>
<dependency>
    <groupId>com.google.zxing</groupId>
    <artifactId>javase</artifactId>
    <version>3.3.0</version>
</dependency>

The text at this point will contain a string like this:

HC1:6BdFOXN%TS3fDHPVO13J /G-/2YRVA.Q/R8NJE2FC1J9M$DIr9C3Ka9I0FULIRJPC%OQHIZC4.OI1RM8ZA.A53XHMKN4NN3F85QNCY0Or%0aVZ0r01HOC9JU0D0HT0rHB2PL/IBa09B9LW4T*8+DC9I0%YB+SG$*SBurgayE9*aFrJ7ID$0HY84Y*a9R1MR0J8-9+:I7/G90L.3T3*8%7TK3JE 4C-DM%2D-CY:aCYZ0PHN6D7LaLrK*2HG%89UV-0LZ 2ZJJ %C4IJZJJBYa43%8 C1VHLEC78aGr1TFrHM*K2ILS-O:Saf9UZ4+aFJE 4Y3LO78L:P…

Full code with standard docker files and basic angular and react application is available here. Read forward for a comprehensive explanation of the focal points of the implementation.

IMPORTANT NOTE: this is a rework and an expansion of the original article by Robin-Manuel Thiel “Dynamically set Angular Environment Variables in Docker”.

1 - Prerequisites: ConfigMap

Used in a POD’s container using “valueFrom” to use just some of the ConfigMap data keys as environment variables:

Or “envFrom”( to define all of the ConfigMap’s data as container environment variables)

Wich from the point of view of the environment is equivalent to having the…