Java 9 High Performance

java.lang.OutOfMemoryError: GC Overhead limit exceeded

This is a rather rare form of the exception OutOfMemoryError. As the name suggests, this error occurs when garbage collector has reached its overhead limit. This means, it is running all the time, but is very slow in collecting objects. See the following example;

import java.util.Map;import java.util.Random;public class GCOverhead {    public static void main(String args[]) throws Exception {        Map map = System.getProperties();        Random r = new Random();        while (true) {            map.put(r.nextInt(), "java 9");        }    }}

Compile the previous program with javac and then use the following command:

java -Xmx100m -XX:+UseParallelGC GCOverhead

This will result in the java.lang.OutOfMemoryError: GC overhead limit ...