Spring StandardTypeLocator fails to resolve Type

Before in SpringBoot version 3.1.5, everything worked well, but when I upgraded to version 3.2.0, the following code did not work:

public class SystemListener implements SpringApplicationRunListener {
    @Override
    public void ready(ConfigurableApplicationContext context, Duration timeTaken) {
        context.publishEvent(new MyCustomEvent("1001"));
    }
}

It throws the following exception: org.springframework.expression.spel.SpelEvaluationException: EL1005E: Type cannot be found 'com.test.event.MyCustomEvent'

However, I did some debugging, the error occurred just in the following line of code in the StandardTypeLocator.java class

@Override
    public Class<?> findType(String typeName) throws EvaluationException {
        Class<?> cachedType = this.typeCache.get(typeName);
        if (cachedType != null) {
            return cachedType;
        }
        Class<?> loadedType = loadType(typeName);
                ////////////////////this line////////////////////
        if (loadedType != null && !(this.classLoader instanceof SmartClassLoader scl && scl.isClassReloadable(loadedType))) {
            this.typeCache.put(typeName, loadedType);
            return loadedType;
        }
        throw new SpelEvaluationException(SpelMessage.TYPE_NOT_FOUND, typeName);
    }

My JDK version: 21

Comment From: bclozel

@Bahramudin can you provide a minimal application that reproduces the problem? This might be linked to a particular classloader arrangement and it would be useful to reproduce the problem consistently.

This also could be a duplicate of https://github.com/spring-projects/spring-framework/issues/31668, can you change the « spring-framework.version » property in your build to test with 6.1.2-SNAPSHOT?

Comment From: snicoll

Thanks for the report, this is a duplicate of #31668

Comment From: Bahramudin

@bclozel Yes, I got it that is a duplicate. One of the solutions (remove dev-tools) also works for me, but I am waiting for this problem to officially get solved. Thanks the Spring Team!!