Intro
For generating heap dumps on JDK 11 is pretty straight forward, following the previous versions – just add the flag when calling java:
-XX:+HeapDumpOnOutOfMemoryError
Generating
[@your_computer] java -XX:+HeapDumpOnOutOfMemoryError -XX:HeapDumpPath=/path/JDK11/java_application
Generated file
The generated file will be java_pid[number].hprof
Tests
For testing, I used the scripts from here
Actually, the second example is pretty straight forward – Error 2 – GC Overhead limit exceeded
// Java program to illustrate // GC Overhead limit exceeded import java.util.*; public class Wrapper { public static void main(String args[]) throws Exception { Map m = new HashMap(); m = System.getProperties(); Random r = new Random(); while (true) { m.put(r.nextInt(), "randomValue"); } } } But I didn’t run with his suggestion and instead, run it without it. Just to see how long it would take. I regretted because the file is huge!
