jackson support for kotlin
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DOHA
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/bin/
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#ignore gradle
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.gradle/
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#ignore build and generated files
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build/
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node/
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out/
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#ignore installed node modules and package lock file
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node_modules/
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package-lock.json
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## Relevant articles:
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<?xml version="1.0" encoding="UTF-8"?>
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<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
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<modelVersion>4.0.0</modelVersion>
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<artifactId>kotlin-libraries-2</artifactId>
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<name>kotlin-libraries-2</name>
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<packaging>jar</packaging>
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<parent>
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<groupId>com.baeldung</groupId>
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<artifactId>parent-kotlin</artifactId>
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<version>1.0.0-SNAPSHOT</version>
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<relativePath>../parent-kotlin</relativePath>
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</parent>
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<dependencies>
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<dependency>
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<groupId>com.fasterxml.jackson.module</groupId>
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<artifactId>jackson-module-kotlin</artifactId>
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</dependency>
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<dependency>
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<groupId>junit</groupId>
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<artifactId>junit</artifactId>
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<scope>test</scope>
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</dependency>
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</dependencies>
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<properties>
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</properties>
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</project>
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<configuration>
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<appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
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<encoder>
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<pattern>%d{YYYY-MM-dd HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n</pattern>
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</encoder>
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</appender>
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<root level="INFO">
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<appender-ref ref="STDOUT"/>
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</root>
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</configuration>
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package com.baeldung.kotlin.jackson
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import com.fasterxml.jackson.annotation.*
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@JsonInclude(JsonInclude.Include.NON_EMPTY)
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data class Book(var title: String, @JsonProperty("author") var authorName: String) {
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var genres: List<String>? = emptyList()
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}
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package com.baeldung.kotlin.jackson
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data class Movie(var name: String, var studio: String, var rating: Float? = 1f)
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package com.baeldung.kotlin.jackson
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import org.junit.Test
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import kotlin.test.assertTrue
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import kotlin.test.assertFalse
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import kotlin.test.assertEquals
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import com.fasterxml.jackson.module.kotlin.jacksonObjectMapper
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import com.fasterxml.jackson.module.kotlin.readValue
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import com.fasterxml.jackson.databind.ObjectMapper
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import com.fasterxml.jackson.module.kotlin.KotlinModule
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class JacksonUnitTest {
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//val mapper = jacksonObjectMapper()
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val mapper = ObjectMapper().registerModule(KotlinModule())
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@Test
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fun whenSerializeMovie_thenSuccess() {
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val movie = Movie("Endgame", "Marvel", 9.2f)
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val serialized = mapper.writeValueAsString(movie)
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val json = """{"name":"Endgame","studio":"Marvel","rating":9.2}"""
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assertEquals(serialized, json)
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}
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@Test
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fun whenDeserializeMovie_thenSuccess() {
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val json = """{"name":"Endgame","studio":"Marvel","rating":9.2}"""
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// val movie: Movie = mapper.readValue(json)
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val movie = mapper.readValue<Movie>(json)
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assertEquals(movie.name, "Endgame")
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assertEquals(movie.studio, "Marvel")
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assertEquals(movie.rating, 9.2f)
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}
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@Test
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fun whenDeserializeMovieWithMissingValue_thenUseDefaultValue() {
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val json = """{"name":"Endgame","studio":"Marvel"}"""
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val movie: Movie = mapper.readValue(json)
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assertEquals(movie.name, "Endgame")
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assertEquals(movie.studio, "Marvel")
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assertEquals(movie.rating, 1f)
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}
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@Test
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fun whenSerializeMap_thenSuccess() {
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val map = mapOf(1 to "one", 2 to "two")
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val serialized = mapper.writeValueAsString(map)
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val json = """{"1":"one","2":"two"}"""
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assertEquals(serialized, json)
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}
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@Test
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fun whenDeserializeMap_thenSuccess() {
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val json = """{"1":"one","2":"two"}"""
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val aMap: Map<Int,String> = mapper.readValue(json)
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assertEquals(aMap[1], "one")
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assertEquals(aMap[2], "two")
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}
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@Test
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fun whenSerializeList_thenSuccess() {
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val movie1 = Movie("Endgame", "Marvel", 9.2f)
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val movie2 = Movie("Shazam", "Warner Bros", 7.6f)
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val movieList = listOf(movie1, movie2)
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val serialized = mapper.writeValueAsString(movieList)
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val json = """[{"name":"Endgame","studio":"Marvel","rating":9.2},{"name":"Shazam","studio":"Warner Bros","rating":7.6}]"""
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assertEquals(serialized, json)
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}
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@Test
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fun whenDeserializeList_thenSuccess() {
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val json = """[{"name":"Endgame","studio":"Marvel","rating":9.2},{"name":"Shazam","studio":"Warner Bros","rating":7.6}]"""
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val movieList: List<Movie> = mapper.readValue(json)
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val movie1 = Movie("Endgame", "Marvel", 9.2f)
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val movie2 = Movie("Shazam", "Warner Bros", 7.6f)
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assertTrue(movieList.contains(movie1))
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assertTrue(movieList.contains(movie2))
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}
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@Test
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fun whenSerializeBook_thenSuccess() {
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val book = Book("Oliver Twist", "Charles Dickens")
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val serialized = mapper.writeValueAsString(book)
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val json = """{"title":"Oliver Twist","author":"Charles Dickens"}"""
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assertEquals(serialized, json)
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}
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@Test
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fun whenDeserializeBook_thenSuccess() {
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val json = """{"title":"Oliver Twist","author":"Charles Dickens"}"""
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val book: Book = mapper.readValue(json)
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assertEquals(book.title, "Oliver Twist")
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assertEquals(book.authorName, "Charles Dickens")
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}
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@Test
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fun givenJsonInclude_whenSerializeBook_thenEmptyFieldExcluded() {
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val book = Book("Oliver Twist", "Charles Dickens")
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val serialized = mapper.writeValueAsString(book)
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val json = """{"title":"Oliver Twist","author":"Charles Dickens"}"""
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assertEquals(serialized, json)
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}
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}
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