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If using a JDK in Eclipse, then navigate to Window -> Preferences -> Java -> Installed JRE's to check if the JDK has been set. If not, do so.
Note: It seems that attempting to use Java 10 on Windows causes a Maven build error with "error: package com.sun.tools.doclets does not exist". Using Java version 1.8 resolves this.
MySQL
MySQL is the database software most people use for the OpenMRS Platform database. You should know your MySQL root password, or have a database ready with username and password to install the OpenMRS Platform into.
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