'tools.jar' seems to be not in IDEA classpath. Please ensure JAVA_HOME points to JDK rather than JRE.

This appeared in a dialog box titled "JDK Required" after I installed IntelliJ IDEA 2016.1.4. I guess I need to go dig up the JDK next. I installed version 2018.1.4 and it put some stuff at C:\Program Files\Java. Maybe I need to find the right JDK and get it installed there too. By the way the IDEA in IntelliJ IDEA stands for integrated development environment application in lieu of just integrated development environment which is what IDE stands for. We have the IDEA acronym just to be silly.