How to keep a override method of ThreadLocal field ?

[merseyalma]

Hi!

public class A
 {
    private final ThreadLocal<DateFormat> format = new ThreadLocal<DateFormat>() {
        @Override
        protected DateFormat initialValue() {
            return new SimpleDateFormat("yyyy-MM-dd");
        }
    };
}

In the above code, I need to keep initialValue method, How to write in proguard.cfg file?

I write the configuration like below

-keepclassmembers class A { *; }

but, it obfuscated as below

  private final ThreadLocal<DateFormat> format = new ThreadLocal<DateFormat>(this) {
      protected DateFormat f() {
        return new SimpleDateFormat("yyyy-MM-dd");
      }
    };

it results in format.get() is null.

[mrjameshamilton]

Hi @merseyalma !

The overridden "iniitalValue" method is actually in an anonymous class called A$1. The ProGuard Playground is useful for questions like these, since you can see visually which keep rules match the entities in your app.

Here is a Playground with your example: https://playground.proguard.com/p/BmAJpS

In short, you'll need a rule that covers the anonymous class like this:

-keep class A$1 {
	*** initialValue();
}