upgrade jackson dependency 2.11.1 -> 2.20 (#33)

* upgraded Jackson dependencies and registered JdkModule with ObjectMapper so that Optional fields can be serialised

Author: nhanlon2

CHANGELOG.md

@@ -1,5 +1,9 @@
 Significant changes since 0.1.0
 
+1.4.0 2026-02-19
+
+- feature: upgraded Jackson dependencies and registered JdkModule with ObjectMapper so that Optional fields can be serialised
+
 1.3.0 2025-12-01
 
 - feature: added 'license' field to DatasetFacade/DatasetVersion #32

build.gradle

@@ -2,9 +2,10 @@ apply plugin: 'java'
 
 group = 'com.researchspace'
 sourceCompatibility = 1.8
-version = '1.3.0'
+version = '1.4.0'
 def springVersion='5.3.24'
-def jacksonVersion='2.11.1'
+def jacksonVersion='2.20.0'
+def jacksonAnnotationsVersion='2.20'
 def lombokVersion='1.18.24'
 
 repositories {
@@ -41,9 +42,11 @@ dependencies {
     implementation 'org.springframework:spring-web:'+springVersion
     implementation 'org.springframework:spring-context:'+springVersion
     implementation 'org.springframework:spring-core:'+springVersion
-    implementation 'com.fasterxml.jackson.core:jackson-annotations:'+jacksonVersion
+    implementation 'com.fasterxml.jackson.core:jackson-annotations:'+jacksonAnnotationsVersion
     implementation 'com.fasterxml.jackson.core:jackson-core:'+jacksonVersion
     implementation 'com.fasterxml.jackson.core:jackson-databind:'+jacksonVersion
+    implementation 'com.fasterxml.jackson.datatype:jackson-datatype-jdk8:'+jacksonVersion
+
 
     implementation 'org.projectlombok:lombok:' + lombokVersion
     annotationProcessor 'org.projectlombok:lombok:' + lombokVersion

src/main/java/com/researchspace/dataverse/http/DataverseOperationsImplV1.java

@@ -5,6 +5,7 @@
 
 import com.fasterxml.jackson.core.JsonProcessingException;
 import com.fasterxml.jackson.databind.ObjectMapper;
+import com.fasterxml.jackson.datatype.jdk8.Jdk8Module;
 import com.researchspace.dataverse.api.v1.DatasetOperations;
 import com.researchspace.dataverse.api.v1.DataverseOperations;
 import com.researchspace.dataverse.api.v1.InfoOperations;
@@ -290,14 +291,14 @@ private String getJsonFromFacade(DatasetFacade facade) {
 
 	private String marshalDataset(Object object) {
 		ObjectMapper mapper = new ObjectMapper();
+		mapper.registerModule(new Jdk8Module());
 		String json = "";
-		try {
-			json = mapper.writeValueAsString(object);
-		} catch (JsonProcessingException e) {
-			// TODO Auto-generated catch block
-			e.printStackTrace();
-		}
-		return json;
+    try {
+      json = mapper.writeValueAsString(object);
+    } catch (JsonProcessingException e) {
+      throw new RuntimeException(e);
+    }
+    return json;
 	}
 
 	/* (non-Javadoc)

src/test/java/com/researchspace/dataverse/entities/DatasetTest.java

@@ -6,9 +6,11 @@
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertFalse;
 
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.fasterxml.jackson.datatype.jdk8.Jdk8Module;
+import java.io.IOException;
 import java.net.MalformedURLException;
 import java.net.URL;
-
 import org.junit.After;
 import org.junit.Before;
 import org.junit.Test;
@@ -48,5 +50,16 @@ public void GetDoiId() throws MalformedURLException {
 		ds.setPersistentUrl(new URL(EXAMPLE_DOI_URL));
 		assertEquals(EXPECTED_DOI_ID, ds.getDoiId().get());
 	}
+	@Test
+	public void testJacksonBehaviour() throws IOException {
+		Dataset dataverseDataset = new Dataset();
+		dataverseDataset.setId(1L);
+		dataverseDataset.setPersistentUrl(new URL("http://localhost:8080/api/datasets/1/versions/1.1"));
+		ObjectMapper objectMapper = new ObjectMapper();
+		objectMapper.registerModule(new Jdk8Module());
+		String json = "";
+			json = objectMapper.writeValueAsString(dataverseDataset);
+			System.out.println(json);
+	}
 
 }

src/test/java/com/researchspace/dataverse/entities/facade/DatasetBuilderTest.java

@@ -5,6 +5,7 @@
 
 import static com.researchspace.dataverse.entities.facade.DatasetTestFactory.*;
 
+import com.fasterxml.jackson.datatype.jdk8.Jdk8Module;
 import java.net.MalformedURLException;
 import java.net.URISyntaxException;
 
@@ -49,9 +50,11 @@ public void tearDown() throws Exception {
 	@Test
 	public void test() throws JsonProcessingException, MalformedURLException, URISyntaxException {
 		DatasetFacade facade = createFacade();
-		ObjectWriter mapper = new ObjectMapper().writerWithDefaultPrettyPrinter();
+		ObjectMapper mapper = new ObjectMapper();
+		mapper.registerModule(new Jdk8Module());
+		ObjectWriter ow = mapper.writer().withDefaultPrettyPrinter();
 		Dataset dversion = builder.build(facade);
-	    String json =   mapper.writeValueAsString(dversion);
+	    String json =   ow.writeValueAsString(dversion);
 	    System.out.println(json);		
 	}
 }