Document JDK build prerequisites (#336)

I think mentioning the need to install Java 8 should be
sufficient here: in the vast majority of cases it should
be picked up automatically, and otherwise the build error
tells you how to explicitly point to it.
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Arnout Engelen 2023-05-24 12:51:34 +02:00 committed by Matthew de Detrich
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commit 1a8997c575
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@ -18,8 +18,9 @@ See https://pekko.apache.org for the documentation including the API docs. The d
Building from Source
--------------------
- You will need to install [sbt](https://www.scala-sbt.org/) if you don't already have it installed
- You should have a Java Runtime installed. Java 8 minimum.
- Make sure you have installed a Java Development Kit (JDK) version 11 or later.
- Make sure you have [sbt](https://www.scala-sbt.org/) installed and using this JDK.
- Make sure you also have Java 8 installed (JDK or JRE).
- Use git to clone the [repo](https://github.com/apache/incubator-pekko) or download a source release from https://pekko.apache.org
- Open a command window and change directory to the directory where you installed the source
- `sbt compile` compiles the main source for project default version of Scala (2.13)