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Re: Java 21 and [this-escape] warnings?

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On 6/9/2023 9:32 PM, Knute Johnson wrote:
> I've been playing with Java21ea getting ready for its release this fall 
> and have found some warnings that I don't really know how to deal with. 
> I understand why you don't want 'this' escaping the constructor but I 
> don't understand how Java21 think that a lot of the methods we have 
> always used are going to cause that to happen.

I think the following example illustrates the problem
they are trying to solve.

public class ThisLeak {
     public static class A {
         protected boolean a;
         public A() {
             a = true;
         }
         public void m() {
             System.out.printf("a=%b\n", a);
         }
     }
     public static class B extends A {
         protected boolean b1;
         protected boolean b2;
         public B() {
             super();
             b1 = true;
             m();
             b2 = true;
         }
     }
     public static class C extends B {
         private boolean c;
         public C() {
             c = true;
         }
         public void m() {
             System.out.printf("a=%b b1=%b b2=%b c=%b\n", a, b1, b2, c);
         }
     }
     public static void main(String[] args) {
         new C();
     }
}

And it also explains why final solve the problem.

Arne

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Thread

Java 21 and [this-escape] warnings? Knute Johnson <knute2023@585ranch.com> - 2023-06-09 20:32 -0500
  Re: Java 21 and [this-escape] warnings? Daniele Futtorovic <da.futt.news@laposte-dot-net.invalid> - 2023-06-10 13:46 +0200
    Re: Java 21 and [this-escape] warnings? Knute Johnson <knute2023@585ranch.com> - 2023-06-10 13:23 -0500
      Re: Java 21 and [this-escape] warnings? Daniele Futtorovic <da.futt.news@laposte-dot-net.invalid> - 2023-06-11 14:45 +0200
  Re: Java 21 and [this-escape] warnings? Eric Sosman <donalhambra@gmail.com> - 2023-06-10 06:58 -0700
    Re: Java 21 and [this-escape] warnings? Knute Johnson <knute2023@585ranch.com> - 2023-06-10 13:26 -0500
  Re: Java 21 and [this-escape] warnings? Arne Vajhøj <arne@vajhoej.dk> - 2023-06-10 18:57 -0400

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