Lambda redefinition ClassCastException when implementing an inner interface

The following code always fails when any part of the class is changed even if no changes happen to the actual interface.

This issue was also submitted to https://github.com/dcevm/dcevm/issues/178


import java.util.HashMap;

public class TestDCEVM {
    public static class Context {
    }

    @FunctionalInterface
    interface Loader {
        void load(Context context);

        static Loader DEFAULT = context -> {
            System.out.println("context");
        };

    }

    public static void main(String[] args) {

        System.getProperties().entrySet().stream().forEach(e->System.out.println(e));
        while (true) {

            HashMap map = new HashMap();
            map.put("loader", Loader.DEFAULT);
            // The line below will cause a ClassCastException any time the class
            // is changed.
            Loader loader = (Loader) map.get("loader");
            loader.load(new Context());
            try {
                Thread.sleep(1000);
            } catch (InterruptedException e) {
                break;
            }
        }
    }
}

This is running with the latest build both in jdk 11 and jdk 8 java.runtime.name=OpenJDK Runtime Environment java.runtime.version=11.0.5+5-201912121506

The error message is WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by org.hotswap.agent.util.ReflectionHelper (file:/C:/Jdk/jdk-11-dcevm/lib/hotswap/hotswap-agent.jar) to method com.sun.beans.util.Cache.clear() WARNING: Please consider reporting this to the maintainers of org.hotswap.agent.util.ReflectionHelper WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Exception in thread "main" java.lang.ClassCastException: class TestDCEVM$Loader$$Lambda$42/0x0000000800138040 cannot be cast to class TestDCEVM$Loader (TestDCEVM$Loader$$Lambda$42/0x0000000800138040 and TestDCEVM$Loader are in unnamed module of loader 'app') at TestDCEVM.main(TestDCEVM.java:26)

Refactoring the Loader into its own file resolves the issue.

TravaOpenJDK / trava-jdk-11-dcevm

Lambda redefinition ClassCastException when implementing an inner interface #21