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();
     }

core-java/src/test/java/com/baeldung/throwsexception/PersonRepositoryUnitTest.java

@@ -1,53 +0,0 @@
-package com.baeldung.throwsexception;
-
-import org.junit.Test;
-
-import java.util.Optional;
-
-import static org.junit.Assert.assertEquals;
-import static org.junit.jupiter.api.Assertions.assertAll;
-import static org.junit.jupiter.api.Assertions.assertThrows;
-
-public class PersonRepositoryUnitTest {
-
-    PersonRepository personRepository = new PersonRepository();
-
-    @Test
-    public void whenIdIsNull_thenExceptionIsThrown() {
-        assertThrows(IllegalArgumentException.class,
-                () ->
-                        Optional
-                                .ofNullable(personRepository.findNameById(null))
-                                .orElseThrow(IllegalArgumentException::new));
-    }
-
-    @Test
-    public void whenIdIsNonNull_thenNoExceptionIsThrown() {
-        assertAll(
-                () ->
-                        Optional
-                                .ofNullable(personRepository.findNameById("id"))
-                                .orElseThrow(RuntimeException::new));
-    }
-
-    @Test
-    public void whenIdNonNull_thenReturnsNameUpperCase() {
-        String name = Optional
-                .ofNullable(personRepository.findNameById("id"))
-                .map(String::toUpperCase)
-                .orElseThrow(RuntimeException::new);
-
-        assertEquals("NAME", name);
-    }
-
-    @Test
-    public void whenIdIsNonNull_thenShouldReturnNameUpperCase() throws Exception {
-        String name = Optional
-                .ofNullable(personRepository.findNameById("id"))
-                .map(String::toUpperCase)
-                .orElseThrow(Exception::new);
-
-        assertEquals("NAME", name);
-    }
-
-}