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Doha2012Doha2012
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Add JacksonExceptions Test
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‎jackson/src/test/java/org/baeldung/jackson/exception/User.java‎

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package org.baeldung.jackson.exception;
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public class User {
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public int id;
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public String name;
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public User(final int id, final String name) {
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this.id = id;
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this.name = name;
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}
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}

‎jackson/src/test/java/org/baeldung/jackson/exception/UserWithConflict.java‎

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package org.baeldung.jackson.exception;
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public class UserWithConflict {
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public int id;
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public String name;
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boolean checked;
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public UserWithConflict() {
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super();
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}
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public UserWithConflict(final int id, final String name, final boolean checked) {
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this.id = id;
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this.name = name;
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this.checked = checked;
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}
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public boolean getChecked() {
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return checked;
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}
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public boolean isChecked() {
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return checked;
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}
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}

‎jackson/src/test/java/org/baeldung/jackson/exception/UserWithPrivateFields.java‎

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package org.baeldung.jackson.exception;
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public class UserWithPrivateFields {
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int id;
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String name;
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public UserWithPrivateFields() {
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super();
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}
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public UserWithPrivateFields(final int id, final String name) {
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this.id = id;
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this.name = name;
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}
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}

‎jackson/src/test/java/org/baeldung/jackson/exception/UserWithRoot.java‎

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package org.baeldung.jackson.exception;
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import com.fasterxml.jackson.annotation.JsonRootName;
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@JsonRootName(value = "user")
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public class UserWithRoot {
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public int id;
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public String name;
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public UserWithRoot() {
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super();
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}
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public UserWithRoot(final int id, final String name) {
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this.id = id;
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this.name = name;
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}
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}

‎jackson/src/test/java/org/baeldung/jackson/exception/Zoo.java‎

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package org.baeldung.jackson.exception;
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public class Zoo {
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public Animal animal;
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}
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abstract class Animal {
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public String name;
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protected Animal() {
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}
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}
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class Cat extends Animal {
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public int lives;
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public Cat() {
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}
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}

‎jackson/src/test/java/org/baeldung/jackson/exception/ZooConfigured.java‎

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package org.baeldung.jackson.exception;
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import com.fasterxml.jackson.databind.annotation.JsonDeserialize;
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public class ZooConfigured {
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public AnimalConfigured animal;
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}
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@JsonDeserialize(as = CatConfigured.class)
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abstract class AnimalConfigured {
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public String name;
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protected AnimalConfigured() {
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}
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}
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class CatConfigured extends AnimalConfigured {
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public int lives;
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public CatConfigured() {
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}
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}

‎jackson/src/test/java/org/baeldung/jackson/test/JacksonExceptionsTest.java‎

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package org.baeldung.jackson.test;
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import static org.hamcrest.Matchers.containsString;
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import static org.junit.Assert.assertEquals;
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import static org.junit.Assert.assertThat;
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import java.io.IOException;
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import java.util.List;
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import org.baeldung.jackson.dtos.User;
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import org.baeldung.jackson.exception.UserWithPrivateFields;
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import org.baeldung.jackson.exception.UserWithRoot;
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import org.baeldung.jackson.exception.Zoo;
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import org.baeldung.jackson.exception.ZooConfigured;
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import org.junit.Test;
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import com.fasterxml.jackson.annotation.JsonAutoDetect.Visibility;
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import com.fasterxml.jackson.annotation.PropertyAccessor;
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import com.fasterxml.jackson.core.JsonFactory;
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import com.fasterxml.jackson.core.JsonParseException;
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import com.fasterxml.jackson.core.JsonParser;
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import com.fasterxml.jackson.core.JsonProcessingException;
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import com.fasterxml.jackson.core.type.TypeReference;
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import com.fasterxml.jackson.databind.DeserializationFeature;
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import com.fasterxml.jackson.databind.JsonMappingException;
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import com.fasterxml.jackson.databind.ObjectMapper;
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import com.fasterxml.jackson.databind.exc.UnrecognizedPropertyException;
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public class JacksonExceptionsTest {
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// JsonMappingException: Can not construct instance of
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@Test(expected = JsonMappingException.class)
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public void givenAbstractClass_whenDeserializing_thenException() throws IOException {
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final String json = "{\"animal\":{\"name\":\"lacy\"}}";
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final ObjectMapper mapper = new ObjectMapper();
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mapper.reader().withType(Zoo.class).readValue(json);
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}
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@Test
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public void givenAbstractClassConfigured_whenDeserializing_thenCorrect() throws IOException {
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final String json = "{\"animal\":{\"name\":\"lacy\"}}";
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final ObjectMapper mapper = new ObjectMapper();
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mapper.reader().withType(ZooConfigured.class).readValue(json);
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}
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// JsonMappingException: No serializer found for class
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@Test(expected = JsonMappingException.class)
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public void givenClassWithPrivateFields_whenSerializing_thenException() throws IOException {
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final UserWithPrivateFields user = new UserWithPrivateFields(1, "John");
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final ObjectMapper mapper = new ObjectMapper();
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mapper.writer().writeValueAsString(user);
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}
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@Test
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public void givenClassWithPrivateFields_whenConfigureSerializing_thenCorrect() throws IOException {
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final UserWithPrivateFields user = new UserWithPrivateFields(1, "John");
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final ObjectMapper mapper = new ObjectMapper();
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mapper.setVisibility(PropertyAccessor.FIELD, Visibility.ANY);
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final String result = mapper.writer().writeValueAsString(user);
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assertThat(result, containsString("John"));
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}
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// JsonMappingException: No suitable constructor found
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@Test(expected = JsonMappingException.class)
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public void givenNoDefaultConstructor_whenDeserializing_thenException() throws IOException {
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final String json = "{\"id\":1,\"name\":\"John\"}";
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final ObjectMapper mapper = new ObjectMapper();
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mapper.reader().withType(org.baeldung.jackson.exception.User.class).readValue(json);
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}
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@Test
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public void givenDefaultConstructor_whenDeserializing_thenCorrect() throws IOException {
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final String json = "{\"id\":1,\"name\":\"John\"}";
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final ObjectMapper mapper = new ObjectMapper();
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final User user = mapper.reader().withType(User.class).readValue(json);
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assertEquals("John", user.name);
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}
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// JsonMappingException: Root name does not match expected
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@Test(expected = JsonMappingException.class)
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public void givenWrappedJsonString_whenDeserializing_thenException() throws IOException {
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final String json = "{\"user\":{\"id\":1,\"name\":\"John\"}}";
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final ObjectMapper mapper = new ObjectMapper();
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mapper.enable(DeserializationFeature.UNWRAP_ROOT_VALUE);
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mapper.reader().withType(User.class).readValue(json);
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}
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@Test
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public void givenWrappedJsonStringAndConfigureClass_whenDeserializing_thenCorrect() throws IOException {
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final String json = "{\"user\":{\"id\":1,\"name\":\"John\"}}";
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final ObjectMapper mapper = new ObjectMapper();
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mapper.enable(DeserializationFeature.UNWRAP_ROOT_VALUE);
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final UserWithRoot user = mapper.reader().withType(UserWithRoot.class).readValue(json);
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assertEquals("John", user.name);
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}
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// JsonMappingException: Can not deserialize instance of
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@Test(expected = JsonMappingException.class)
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public void givenJsonOfArray_whenDeserializing_thenException() throws JsonProcessingException, IOException {
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final String json = "[{\"id\":1,\"name\":\"John\"},{\"id\":2,\"name\":\"Adam\"}]";
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final ObjectMapper mapper = new ObjectMapper();
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mapper.reader().withType(User.class).readValue(json);
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}
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@Test
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public void givenJsonOfArray_whenDeserializing_thenCorrect() throws JsonProcessingException, IOException {
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final String json = "[{\"id\":1,\"name\":\"John\"},{\"id\":2,\"name\":\"Adam\"}]";
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final ObjectMapper mapper = new ObjectMapper();
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final List<User> users = mapper.reader().withType(new TypeReference<List<User>>() {
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}).readValue(json);
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assertEquals(2, users.size());
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}
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// UnrecognizedPropertyException
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@Test(expected = UnrecognizedPropertyException.class)
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public void givenJsonStringWithExtra_whenDeserializing_thenException() throws IOException {
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final String json = "{\"id\":1,\"name\":\"John\", \"checked\":true}";
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final ObjectMapper mapper = new ObjectMapper();
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mapper.reader().withType(User.class).readValue(json);
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}
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@Test
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public void givenJsonStringWithExtra_whenConfigureDeserializing_thenCorrect() throws IOException {
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final String json = "{\"id\":1,\"name\":\"John\", \"checked\":true}";
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final ObjectMapper mapper = new ObjectMapper();
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mapper.disable(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES);
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final User user = mapper.reader().withType(User.class).readValue(json);
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assertEquals("John", user.name);
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}
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// JsonParseException: Unexpected character (''' (code 39))
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@Test(expected = JsonParseException.class)
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public void givenStringWithSingleQuotes_whenDeserializing_thenException() throws JsonProcessingException, IOException {
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final String json = "{'id':1,'name':'John'}";
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final ObjectMapper mapper = new ObjectMapper();
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mapper.reader().withType(User.class).readValue(json);
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}
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@Test
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public void givenStringWithSingleQuotes_whenConfigureDeserializing_thenCorrect() throws JsonProcessingException, IOException {
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final String json = "{'id':1,'name':'John'}";
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final JsonFactory factory = new JsonFactory();
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factory.enable(JsonParser.Feature.ALLOW_SINGLE_QUOTES);
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final ObjectMapper mapper = new ObjectMapper(factory);
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final User user = mapper.reader().withType(User.class).readValue(json);
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assertEquals("John", user.name);
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}
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}

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