Apache Solr Debian 9

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Installing Apache Solr on Debian 9 (Stretch) for Drupal Search API.
This is based on the howto of River Harbor and (regarding Java) slighty simplified. For using with Search API Solr backends for Drupal 7 or 8 you can install Apache Solr on a Debian 9 (Stretch) server with the following steps: Java Runtime Environment (JRE) First the Java Runtime Environment (JRE) has to be installed on the system: apt-get update -y && apt-get upgrade -y apt-get install default-jre-headless It’s possible to install the Java Development Toolkit (JDK) instead, since it also contains the JRE.