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/Language.java

@@ -118,4 +118,5 @@ public class Language extends TableImpl<Record> {
 	public Language rename(String name) {
 		return new Language(name, null);
 	}
+
 }