BAEL-2122 Optional or else throw (#5047)

* Throw and throws in Java

* BAEL-2122 | throw exception in optional

* BAEL-2122 | optional orelsethrow

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

@@ -4,6 +4,7 @@ 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;
 
@@ -29,4 +30,14 @@ public class PersonRepositoryUnitTest {
                                 .orElseThrow(Exception::new));
     }
 
+    @Test
+    public void whenIdIsNonNull_thenShouldReturnNameUpperCase() throws Exception {
+        String name = Optional
+                .ofNullable(personRepository.findNameById("id"))
+                .map(String::toUpperCase)
+                .orElseThrow(Exception::new);
+
+        assertEquals("NAME", name);
+    }
+
 }