Java: how to detect the current java runtime is a JRE or JDK?

Question

I got a Java application, I want to provide user ability to compile Java source code (Using JavaCompiler interface)

If the user run the application on a JRE, my application should tell user that the no JavaCompiler instance aviable.

so how to detect JDK or JRE in java programe?

Answer 1

You can request an implementation of JavaCompiler from ToolProvider. If it returns null, there is no implementation of JavaCompiler available:

JavaCompiler c = ToolProvider.getSystemJavaCompiler();
if (c == null) {
    // JRE
}