Steps to Reproduce

1. compile IssueRichlet in Java 1.8
2. run it in Java 15 or above with zk zul and stateless 10.0.0.FL.20230220
3. visit the page of Richlet

Current Result

java.lang.IllegalArgumentException: withAction() cannot accept anonymous class, please convert it to Lambda syntax.
at org.zkoss.stateless.sul.IComponent.checkActions(IComponent.java:421)
at org.zkoss.stateless.sul.ImmutableITextbox.validate(ImmutableITextbox.java:4636)
at org.zkoss.stateless.sul.ImmutableITextbox.withAction(ImmutableITextbox.java:1307)
at org.zkoss.stateless.sul.ImmutableITextbox.withAction(ImmutableITextbox.java:27)
at org.zkoss.stateless.sul.IComponent.withAction(IComponent.java:314)
at org.zkoss.zephyr.demo.richlet.IssueRichlet.index(IssueRichlet.java:21)

Expected Result

no error

Debug Information

1. getCanonicalName() returns null when running in a different version Java from the java version I use to compile the code
2.

public interface ActionHandler extends Serializable {
...
	default SerializedLambda serialized() {
		try {
			return LOADED_LAMBDA_CACHE.computeIfAbsent(getClass().getCanonicalName(), (ignore) -> {..}

simulated case

Steps to Reproduce

1. compile MyClassTest and its dependent in java 1.8
2. run MyClassTest in java 15 or above
java test.MyClassTest

Current Result

getCanonicalName() returns null

Debug info

• compile in java 11 also can reproduce this bug
• because since Java 15, method references and lambdas (or rather, invokedynamic) are now implemented using hidden classes, at least in the OpenJDK. In short, hidden classes are classes that are defined dynamically at runtime, using Lookup.defineHiddenClass, has no binary name, and does not need a class loader to be loaded.