javac cannot be run, and furthermore does not seem installed

Question

I have a problem involving setting up Java.

I have installed the JRE, added its path to PATH, and set JAVA_HOME and CLASSPATH.

Answer 1

The JRE is merely the Java Runtime Environment, which includes only the infrastructure needed to run Java programs that are already compiled.

To compile Java source code using javac, you need the Java Development Kit (JDK).

On Oracle's Java download page, choose the package labelled "JDK".