download geoserver and java 

In this video you will learn Geoserver server download and compatible java.
geoserver download site and all old versions
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geoserver.org/download/
Java download site and all versions available
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adoptopenjdk.net/
NB: It is essential to choose for each version of geoserver the Java version that is compatible. Otherwise the geoserver will not work well on your computer
When you go to open geoserver versions, the recommended java is just notified beside

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