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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
And the author is right, getting started with java can just be downright miserable if you try to download and install a jdk yourself. His examples show sdkman but that only works on nix systems or systems with a bash shell. If you're on windows, I recommend https://scoop.sh/. Great little program and package manager built in powershell. This will install a jdk and set the necessary environment variables for you. It also makes upgrading java versions (or switching between jdks) trivial. You can also install an IDE that way like Eclipse, VSCode or Intellij. I use VSCode for java and javascript development and I love it.
While I can build the OpenJDK on my machine (by following this instructions), I have no idea how it actually works.