Move optional to java-8-core (#5105)

core-java/src/main/java/com/baeldung/throwsexception/PersonRepository.java

@@ -1,16 +1,10 @@
 package com.baeldung.throwsexception;
 
-import javax.annotation.Nullable;
 import java.sql.SQLException;
 import java.util.List;
 
 public class PersonRepository {
 
-    @Nullable
-    public String findNameById(String id) {
-        return id == null ? null : "Name";
-    }
-
     public List<String> findAll() throws SQLException {
         throw new SQLException();
     }