https://issuetracker.google.com/issues/366412380

output

$ java Test.java
args=
Bar initialiser...
Bar()foo=Test$Foo@419c5f1a

$ java Test.java optimised
args=optimised
Bar initialiser...
Bar()foo=Test$Foo@419c5f1a

$ java Test.java nosuper
args=nosuper
Bar initialiser...
tcns.foo=Test$Foo@419c5f1a
Bar()foo=null

$ java Test.java nosuper optimised
args=nosuper,optimised
Bar initialiser...
tcns.foo=Test$Foo@419c5f1a
Bar()foo=Test$Foo@419c5f1a

Test.java

import java.util.Arrays;
import java.util.List;
class Test {
  public static TestClassNoSuper tcns;
  public static TestClassExtendsBar tceb;
  public static class Foo {}
  public static class Bar {
    static {
      System.out.println("Bar initialiser...");
      if (tcns != null) {
        System.out.println("tcns.foo=" + tcns.foo);
        tcns.foo = null;
      }
      if (tceb != null) {
        System.out.println("tceb.foo=" + tceb.foo);
        tceb.foo = null;
      }
    }
    public Bar() {}
    public Bar(Foo foo) {
      System.out.println("Bar()foo=" + foo);
    }
  }
  public static class TestClassExtendsBar extends Bar {
    protected Foo foo;
    public void useFoo() {
      this.foo = new Foo();
      // System.out.println("...");
      new Bar(this.foo);
    }
    public void useFooOptimised() {
      final Foo _foo = new Foo();
      this.foo = _foo;
      // System.out.println("...");
      new Bar(_foo);
    }
  }
  public static class TestClassNoSuper {
    protected Foo foo;
    public void useFoo() {
      this.foo = new Foo();
      // System.out.println("...");
      new Bar(this.foo);
    }
    public void useFooOptimised() {
      final Foo _foo = new Foo();
      this.foo = _foo;
      // System.out.println("...");
      new Bar(_foo);
    }
  }
  public static void main(String[] args) {
    System.out.println("args=" + String.join(",", args));
    List<String> largs = Arrays.asList(args);
    if (largs.contains("nosuper")) {
      // System.out.println("--");
      tcns = new TestClassNoSuper();
      // System.out.println("--");
      if (largs.contains("optimised")) {
        tcns.useFooOptimised();
      } else {
        tcns.useFoo();
      }
      // System.out.println("--");
    } else {
      // System.out.println("--");
      tceb = new TestClassExtendsBar();
      // System.out.println("--");
      if (largs.contains("optimised")) {
        tceb.useFooOptimised();
      } else {
        tceb.useFoo();
      }
      // System.out.println("--");
    }
  }
}