Cannot call method of outer class in yguard-obfuscated file

[gbl]

Note that this is similar to https://stackoverflow.com/questions/66350654/unable-to-access-private-fields-and-methods-from-inner-class-after-yguard-obfusc where the answer says it works with yguard 3.0 and should possibly be posted as an issue if the problem persists.

Here's my example.java:

package com.example;

public class Example {
	private static void privatemethod() {
		System.out.println("in private method");
	}

	public static void main(String[] args)  {
		new Thread() {
			@Override
			public void run() {
				privatemethod();
			}
		}.start();
	}
}

// non-static version that goes wrong as well:
// private void privatemethod() {
// new Example().privatemethod();

and here's the yguard part of my build.xml:

    <yguard>
      <inoutpair in="dist/Example.jar" out="dist/Example-yg.jar"/>
      <shrink logfile="dist/shrink.log"/>
      <rename mainclass="com.example.Example" logfile="dist/rename.log">
        <keep>
          <class classes="protected" methods="protected" fields="protected">
            <patternset>
              <include name="com.example.Example.**"/>
            </patternset>
          </class>
        </keep>
      </rename>
    </yguard>

Running both files:

gbl@natascha$ java17 -jar dist/Example.jar 
in private method
gbl@natascha$ java17 -jar dist/Example-yg.jar 
Exception in thread "Thread-0" java.lang.IllegalAccessError: class com.example.Example$1 tried to access private method 'void com.example.Example.A()' (com.example.Example$1 and com.example.Example are in unnamed module of loader 'app')
	at com.example.Example$1.run(Unknown Source)

I downloaded the yguard files 2 hours ago, they are version 3.1.0:

-rw-r--r-- 1 gbl gbl 122004 Mar 28 11:57 asm-9.2.jar
-rw-r--r-- 1 gbl gbl   1162 Mar 28 11:57 ObfuscationAnnotation-3.1.0.jar
-rw-r--r-- 1 gbl gbl 451474 Mar 28 11:56 yguard-3.1.0.jar

[gbl]

ygexample.zip

Here's the complete source directory, including the yguard files in lib/, if it helps in any way. Compile with ant jar.

[Thomas Behr]

Thank you very much for the detailed report and the example files.

This is a bug in yGuard's shrinker (only).

As a workaround, you can rename without shrinking. I.e. remove the line

<shrink logfile="dist/shrink.log"/>

from your <yguard> task configuration.

[Stephan Schmid]

Thank you for this valuable task and for fixing this issue!

Any idea when a new official release that includes this fix is planned?

[Thomas Behr]

We have not decided yet on a date for the next release.