test/hotspot/jtreg/gc/g1/TestConcurrentSystemGC.java

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/*
 * @test TestConcurrentSystemGC
 * @bug 8195158
 * @summary Test that a System.gc() with -XX:+ExplicitGCInvokesConcurrent
 *          is *not* upgraded to STW full GC
 * @key gc
 * @requires vm.gc.G1
 * @library /test/lib
 * @modules java.base/jdk.internal.misc
 *          java.management
 * @run main/othervm -XX:+UseG1GC -XX:+ExplicitGCInvokesConcurrent -Xmx8m -Xms8m -XX:G1HeapRegionSize=1m TestConcurrentSystemGC
 */

import java.util.ArrayList;
import java.util.List;

public class TestConcurrentSystemGC {
    public static List<char[]> memory;
    public static void main(String[] args) throws Exception {
        memory = new ArrayList<>();
        try {
            while (true) {
                memory.add(new char[1024 * 128]);
                System.gc(); // should not trigger any assertions
            }
        } catch (OutOfMemoryError e) {
            memory = null;
            System.gc();
        }
    }
}