add correct deserializers

Author: katrinSaleschus

gitlab4j-models/src/main/java/org/gitlab4j/api/models/User.java

@@ -8,6 +8,7 @@
 
 import com.fasterxml.jackson.annotation.JsonProperty;
 import com.fasterxml.jackson.databind.annotation.JsonDeserialize;
+import com.fasterxml.jackson.databind.annotation.JsonSerialize;
 
 public class User extends AbstractUser<User> {
     private static final long serialVersionUID = 1L;
@@ -54,7 +55,7 @@ public class User extends AbstractUser<User> {
     private Boolean isAdmin;
 
     @JsonProperty("last_activity_on")
-    @JsonDeserialize(using = MultiDateFormatDeserializer.class)
+    @JsonSerialize(using = JacksonJson.DateOnlySerializer.class)
     private Date lastActivityOn;
 
     @JsonProperty("last_sign_in_at")

gitlab4j-models/src/main/java/org/gitlab4j/api/webhook/EventChanges.java

@@ -7,20 +7,24 @@
 
 import org.gitlab4j.api.models.Assignee;
 import org.gitlab4j.models.utils.JacksonJson;
+import org.gitlab4j.models.utils.MultiDateFormatDeserializer;
 
 import com.fasterxml.jackson.annotation.JsonAnyGetter;
 import com.fasterxml.jackson.annotation.JsonAnySetter;
 import com.fasterxml.jackson.annotation.JsonProperty;
+import com.fasterxml.jackson.databind.annotation.JsonDeserialize;
 
 public abstract class EventChanges {
 
     @JsonProperty("author_id")
     private ChangeContainer<Long> authorId;
 
     @JsonProperty("created_at")
+    @JsonDeserialize(using = MultiDateFormatDeserializer.class)
     private ChangeContainer<Date> createdAt;
 
     @JsonProperty("updated_at")
+    @JsonDeserialize(using = MultiDateFormatDeserializer.class)
     private ChangeContainer<Date> updatedAt;
 
     @JsonProperty("updated_by_id")

gitlab4j-models/src/main/java/org/gitlab4j/api/webhook/IssueChanges.java

@@ -2,11 +2,15 @@
 
 import java.util.Date;
 
+import org.gitlab4j.models.utils.JacksonJson;
+
 import com.fasterxml.jackson.annotation.JsonProperty;
+import com.fasterxml.jackson.databind.annotation.JsonSerialize;
 
 public class IssueChanges extends EventChanges {
 
     @JsonProperty("due_date")
+    @JsonSerialize(using = JacksonJson.DateOnlySerializer.class)
     private ChangeContainer<Date> dueDate;
 
     @JsonProperty("confidential")

gitlab4j-models/src/main/java/org/gitlab4j/api/webhook/WorkItemChanges.java

@@ -2,13 +2,17 @@
 
 import java.util.Date;
 
+import org.gitlab4j.models.utils.MultiDateFormatDeserializer;
+
 import com.fasterxml.jackson.annotation.JsonProperty;
+import com.fasterxml.jackson.databind.annotation.JsonDeserialize;
 
 public class WorkItemChanges extends EventChanges {
     @JsonProperty("health_status")
     private ChangeContainer<String> healthStatus;
 
     @JsonProperty("last_edited_at")
+    @JsonDeserialize(using = MultiDateFormatDeserializer.class)
     private ChangeContainer<Date> lastEditedAt;
 
     public ChangeContainer<String> getHealthStatus() {