Migrate from ExpectedException rule to AssertJ

Replace ExpectedException JUnit rules with AssertJ exception
assertions.

Closes gh-14336

spring-boot-samples/spring-boot-sample-jooq/gensrc/main/java/sample/jooq/domain/Public.java

@@ -79,4 +79,5 @@ public class Public extends SchemaImpl {
 		return Arrays.<Table<?>>asList(Language.LANGUAGE, Author.AUTHOR, Book.BOOK,
 				BookStore.BOOK_STORE, BookToBookStore.BOOK_TO_BOOK_STORE);
 	}
+
 }