Fix ClassCastException message detection on Java 11

This commit also fixes the detection of a ClassCastException that can
be safely ignored on the module path with Java 9

Closes gh-14033

spring-boot-project/spring-boot/src/main/java/org/springframework/boot/util/LambdaSafe.java

@@ -188,9 +188,22 @@ public final class LambdaSafe {
 				return false;
 			}
 			Class<? extends Object> argumentType = argument.getClass();
+			// On Java 8, the message starts with the class name: "java.lang.String cannot
+			// be cast..."
 			if (message.startsWith(argumentType.getName())) {
 				return true;
 			}
+			// On Java 11, the message starts with "class ..." a.k.a. Class.toString()
+			if (message.startsWith(argumentType.toString())) {
+				return true;
+			}
+			// On Java 9, the message used to contain the module name:
+			// "java.base/java.lang.String cannot be cast..."
+			int moduleSeparatorIndex = message.indexOf('/');
+			if (moduleSeparatorIndex != -1 && message.startsWith(argumentType.getName(),
+					moduleSeparatorIndex + 1)) {
+				return true;
+			}
 			if (CLASS_GET_MODULE != null) {
 				Object module = ReflectionUtils.invokeMethod(CLASS_GET_MODULE,
 						argumentType);