handle optional in Jackson

src/main/java/tech/jhipster/lite/generator/server/springboot/mvc/web/domain/SpringBootMvcsModulesFactory.java

@@ -23,6 +23,10 @@ public class SpringBootMvcsModulesFactory {
   private static final JHipsterSource MAIN_SOURCE = SOURCE.append("main");
   private static final JHipsterSource TEST_SOURCE = SOURCE.append("test");
 
+  private static final JHipsterSource JACKSON_MAIN_SOURCE = from("server/springboot/jackson/main");
+  private static final JHipsterSource JACKSON_TEST_SOURCE = from("server/springboot/jackson/test");
+  private static final String WIRE_JACKSON_CONFIG = "wire/jackson/infrastructure/primary";
+
   private static final GroupId SPRING_BOOT_GROUP = groupId("org.springframework.boot");
   private static final ArtifactId STARTER_WEB_ARTIFACT_ID = artifactId("spring-boot-starter-web");
 
@@ -84,11 +88,14 @@ private JHipsterModuleBuilder springMvcBuilder(JHipsterModuleProperties properti
         .and()
       .springMainProperties()
         .set(SERVER_PORT, propertyValue(properties.serverPort().get()))
+        .set(propertyKey("spring.jackson.default-property-inclusion"), propertyValue("non_absent"))
         .and()
       .springTestProperties()
         .set(SERVER_PORT, propertyValue(0))
         .and()
       .files()
+        .add(JACKSON_MAIN_SOURCE.append(WIRE_JACKSON_CONFIG).template("JacksonConfiguration.java"), toSrcMainJava().append(packagePath).append(WIRE_JACKSON_CONFIG).append("JacksonConfiguration.java"))
+        .add(JACKSON_TEST_SOURCE.append(WIRE_JACKSON_CONFIG).template("JacksonConfigurationIT.java"), toSrcTestJava().append(packagePath).append(WIRE_JACKSON_CONFIG).append("JacksonConfigurationIT.java"))
         .add(SOURCE.file("resources/404.html"), to("src/main/resources/public/error/404.html"))
         .batch(MAIN_SOURCE.append(CORS), mainDestination.append(CORS_PRIMARY))
           .addTemplate("CorsFilterConfiguration.java")

src/main/java/tech/jhipster/lite/generator/server/springboot/webflux/web/domain/SpringBootWebfluxModuleFactory.java

@@ -14,7 +14,9 @@
 public class SpringBootWebfluxModuleFactory {
 
   private static final JHipsterSource SOURCE = from("server/springboot/webflux/web");
-
+  private static final JHipsterSource JACKSON_MAIN_SOURCE = from("server/springboot/jackson/main");
+  private static final JHipsterSource JACKSON_TEST_SOURCE = from("server/springboot/jackson/test");
+  private static final String WIRE_JACKSON_CONFIG = "wire/jackson/infrastructure/primary";
   private static final PropertyKey SERVER_PORT = propertyKey("server.port");
 
   private static final GroupId SPRING_GROUP = groupId("org.springframework.boot");
@@ -39,11 +41,14 @@ public JHipsterModule buildNettyModule(JHipsterModuleProperties properties) {
         .and()
       .springMainProperties()
         .set(SERVER_PORT, propertyValue(properties.serverPort().get()))
+        .set(propertyKey("spring.jackson.default-property-inclusion"), propertyValue("non_absent"))
         .and()
       .springTestProperties()
         .set(SERVER_PORT, propertyValue(0))
         .and()
       .files()
+        .add(JACKSON_MAIN_SOURCE.append(WIRE_JACKSON_CONFIG).template("JacksonConfiguration.java"), toSrcMainJava().append(packagePath).append(WIRE_JACKSON_CONFIG).append("JacksonConfiguration.java"))
+        .add(JACKSON_TEST_SOURCE.append(WIRE_JACKSON_CONFIG).template("JacksonConfigurationIT.java"), toSrcTestJava().append(packagePath).append(WIRE_JACKSON_CONFIG).append("JacksonConfigurationIT.java"))
         .batch(SOURCE.append("main"), toSrcMainJava().append(packagePath).append(EXCEPTION_PRIMARY))
           .addTemplate("FieldErrorDTO.java")
           .addTemplate("HeaderUtil.java")

src/main/resources/config/application.yml

@@ -80,6 +80,6 @@ spring:
     virtual:
       enabled: true
   jackson:
-    default-property-inclusion: non_null
+    default-property-inclusion: non_absent
   application:
     name: jhlite

src/main/resources/generator/server/springboot/jackson/main/wire/jackson/infrastructure/primary/JacksonConfiguration.java.mustache

@@ -0,0 +1,14 @@
+package {{packageName}}.wire.jackson.infrastructure.primary;
+
+import com.fasterxml.jackson.datatype.jdk8.Jdk8Module;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+
+@Configuration
+class JacksonConfiguration {
+
+  @Bean
+  Jdk8Module jdk8Module() {
+    return new Jdk8Module();
+  }
+}

src/main/resources/generator/server/springboot/jackson/test/wire/jackson/infrastructure/primary/JacksonConfigurationIT.java.mustache

@@ -0,0 +1,23 @@
+package {{packageName}}.wire.jackson.infrastructure.primary;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+import com.fasterxml.jackson.core.JsonProcessingException;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import {{packageName}}.IntegrationTest;
+import java.util.Optional;
+import org.junit.jupiter.api.Test;
+import org.springframework.beans.factory.annotation.Autowired;
+
+@IntegrationTest
+class JacksonConfigurationIT {
+
+  @Autowired
+  private ObjectMapper objectMapper;
+
+  @Test
+  void shouldHandleOptional() throws JsonProcessingException {
+    Optional<String> optional = Optional.of("test");
+    assertThat(objectMapper.writeValueAsString(optional)).isEqualTo("\"test\"");
+  }
+}

src/test/features/server/springboot/spring-mvc.feature

@@ -7,6 +7,10 @@ Feature: Spring MVC
       | spring-boot-mvc-empty |
       | spring-boot-tomcat    |
     Then I should have "<artifactId>spring-boot-starter-web</artifactId>" in "pom.xml"
+    Then I should have files in "src/main/java/tech/jhipster/chips/wire/jackson/infrastructure/primary"
+      | JacksonConfiguration.java |
+    Then I should have files in "src/test/java/tech/jhipster/chips/wire/jackson/infrastructure/primary"
+      | JacksonConfigurationIT.java |
 
   Scenario: Should apply spring mvc undertow module
     When I apply modules to default project
@@ -15,3 +19,7 @@ Feature: Spring MVC
       | spring-boot-mvc-empty |
       | spring-boot-undertow  |
     Then I should have "<artifactId>spring-boot-starter-undertow</artifactId>" in "pom.xml"
+    Then I should have files in "src/main/java/tech/jhipster/chips/wire/jackson/infrastructure/primary"
+      | JacksonConfiguration.java |
+    Then I should have files in "src/test/java/tech/jhipster/chips/wire/jackson/infrastructure/primary"
+      | JacksonConfigurationIT.java |

src/test/features/server/springboot/webflux.feature

@@ -9,3 +9,7 @@ Feature: Webflux module
     Then I should have "<artifactId>spring-boot-starter-webflux</artifactId>" in "pom.xml"
     Then I should have files in "src/main/java/tech/jhipster/chips/shared/error/infrastructure/primary"
       | FieldErrorDTO.java |
+    Then I should have files in "src/main/java/tech/jhipster/chips/wire/jackson/infrastructure/primary"
+      | JacksonConfiguration.java |
+    Then I should have files in "src/test/java/tech/jhipster/chips/wire/jackson/infrastructure/primary"
+      | JacksonConfigurationIT.java |

src/test/java/tech/jhipster/lite/generator/server/springboot/mvc/web/domain/SpringBootMvcsModulesFactoryTest.java

@@ -103,6 +103,9 @@ private JHipsterModuleAsserter assertMvcModule(JHipsterModule module) {
         """
         server:
           port: 9000
+        spring:
+          jackson:
+            default-property-inclusion: non_absent
         """
       )
       .and()
@@ -145,6 +148,10 @@ private JHipsterModuleAsserter assertMvcModule(JHipsterModule module) {
             </dependency>
         """
       )
+      .and()
+      .hasFile("src/main/java/tech/jhipster/jhlitest/wire/jackson/infrastructure/primary/JacksonConfiguration.java")
+      .and()
+      .hasFile("src/test/java/tech/jhipster/jhlitest/wire/jackson/infrastructure/primary/JacksonConfigurationIT.java")
       .and();
   }
 }

src/test/java/tech/jhipster/lite/generator/server/springboot/webflux/web/domain/SpringBootWebfluxModuleFactoryTest.java

@@ -56,6 +56,9 @@ void shouldBuildWebfluxNettyModule() {
         """
         server:
           port: 9000
+        spring:
+          jackson:
+            default-property-inclusion: non_absent
         """
       )
       .and()
@@ -67,6 +70,10 @@ void shouldBuildWebfluxNettyModule() {
         """
       )
       .and()
+      .hasFile("src/main/java/tech/jhipster/jhlitest/wire/jackson/infrastructure/primary/JacksonConfiguration.java")
+      .and()
+      .hasFile("src/test/java/tech/jhipster/jhlitest/wire/jackson/infrastructure/primary/JacksonConfigurationIT.java")
+      .and()
       .hasPrefixedFiles("src/main/java/tech/jhipster/jhlitest/shared/error/infrastructure/primary", "HeaderUtil.java", "FieldErrorDTO.java")
       .hasPrefixedFiles(
         "src/test/java/tech/jhipster/jhlitest/shared/error/infrastructure/primary",