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JAVA-4215 Fix issue in "Jackson Bidirectional Rels" article

This commit is contained in:
mikr 2021-02-28 22:50:54 +01:00
parent 223a507172
commit c60e01034d
3 changed files with 36 additions and 11 deletions
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4
jackson-modules/jackson-annotations/src/main/java/com/baeldung/jackson/bidirection/ItemWithRef.java
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@ -1,12 +1,12 @@
package com.baeldung.jackson.bidirection; package com.baeldung.jackson.bidirection;
import com.fasterxml.jackson.annotation.JsonManagedReference; import com.fasterxml.jackson.annotation.JsonBackReference;
public class ItemWithRef { public class ItemWithRef {
public int id; public int id;
public String itemName; public String itemName;
@JsonManagedReference @JsonBackReference
public UserWithRef owner; public UserWithRef owner;
public ItemWithRef() { public ItemWithRef() {

6
jackson-modules/jackson-annotations/src/main/java/com/baeldung/jackson/bidirection/UserWithRef.java
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@ -3,13 +3,13 @@ package com.baeldung.jackson.bidirection;
import java.util.ArrayList; import java.util.ArrayList;
import java.util.List; import java.util.List;
import com.fasterxml.jackson.annotation.JsonBackReference; import com.fasterxml.jackson.annotation.JsonManagedReference;
public class UserWithRef { public class UserWithRef {
public int id; public int id;
public String name; public String name;
@JsonBackReference @JsonManagedReference
public List<ItemWithRef> userItems; public List<ItemWithRef> userItems;
public UserWithRef() { public UserWithRef() {
@ -19,7 +19,7 @@ public class UserWithRef {
public UserWithRef(final int id, final String name) { public UserWithRef(final int id, final String name) {
this.id = id; this.id = id;
this.name = name; this.name = name;
userItems = new ArrayList<ItemWithRef>(); userItems = new ArrayList<>();
} }
public void addItem(final ItemWithRef item) { public void addItem(final ItemWithRef item) {

37
jackson-modules/jackson-annotations/src/test/java/com/baeldung/jackson/bidirection/JacksonBidirectionRelationUnitTest.java
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@ -1,7 +1,9 @@
package com.baeldung.jackson.bidirection; package com.baeldung.jackson.bidirection;
import static org.hamcrest.Matchers.containsString; import static org.hamcrest.Matchers.containsString;
import static org.hamcrest.Matchers.is;
import static org.hamcrest.Matchers.not; import static org.hamcrest.Matchers.not;
import static org.hamcrest.Matchers.nullValue;
import static org.junit.Assert.assertEquals; import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertThat; import static org.junit.Assert.assertThat;
@ -16,7 +18,7 @@ import com.fasterxml.jackson.databind.ObjectMapper;
public class JacksonBidirectionRelationUnitTest { public class JacksonBidirectionRelationUnitTest {
@Test(expected = JsonMappingException.class) @Test (expected = JsonMappingException.class)
public void givenBidirectionRelation_whenSerializing_thenException() throws JsonProcessingException { public void givenBidirectionRelation_whenSerializing_thenException() throws JsonProcessingException {
final User user = new User(1, "John"); final User user = new User(1, "John");
final Item item = new Item(2, "book", user); final Item item = new Item(2, "book", user);
@ -26,16 +28,39 @@ public class JacksonBidirectionRelationUnitTest {
} }
@Test @Test
public void givenBidirectionRelation_whenUsingJacksonReferenceAnnotation_thenCorrect() throws JsonProcessingException { public void givenBidirectionRelation_whenUsingJacksonReferenceAnnotationWithSerialization_thenCorrect() throws JsonProcessingException {
final UserWithRef user = new UserWithRef(1, "John"); final UserWithRef user = new UserWithRef(1, "John");
final ItemWithRef item = new ItemWithRef(2, "book", user); final ItemWithRef item = new ItemWithRef(2, "book", user);
user.addItem(item); user.addItem(item);
final String result = new ObjectMapper().writeValueAsString(item); final String itemJson = new ObjectMapper().writeValueAsString(item);
final String userJson = new ObjectMapper().writeValueAsString(user);
assertThat(result, containsString("book")); assertThat(itemJson, containsString("book"));
assertThat(result, containsString("John")); assertThat(itemJson, not(containsString("John")));
assertThat(result, not(containsString("userItems")));
assertThat(userJson, containsString("John"));
assertThat(userJson, containsString("userItems"));
assertThat(userJson, containsString("book"));
}
@Test
public void givenBidirectionRelation_whenUsingJacksonReferenceAnnotationWithDeserialization_thenCorrect() throws JsonProcessingException {
final UserWithRef user = new UserWithRef(1, "John");
final ItemWithRef item = new ItemWithRef(2, "book", user);
user.addItem(item);
final String itemJson = new ObjectMapper().writeValueAsString(item);
final String userJson = new ObjectMapper().writeValueAsString(user);
final ItemWithRef itemRead = new ObjectMapper().readValue(itemJson, ItemWithRef.class);
final UserWithRef userRead = new ObjectMapper().readValue(userJson, UserWithRef.class);
assertThat(itemRead.itemName, is("book"));
assertThat(itemRead.owner, nullValue());
assertThat(userRead.name, is("John"));
assertThat(userRead.userItems.get(0).itemName, is("book"));
} }
@Test @Test