Add implements Serializable to all model classes to support native image (GraalVM) (#1074)

---------

Co-authored-by: Jeremie Bresson <jeremie.bresson@unblu.com>

src/main/java/org/gitlab4j/api/models/EpicInLink.java

@@ -3,6 +3,7 @@ package org.gitlab4j.api.models;
 import org.gitlab4j.api.utils.JacksonJson;
 
 public class EpicInLink extends AbstractEpic<EpicInLink> {
+    private static final long serialVersionUID = 1L;
 
     public String toString() {
         return (JacksonJson.toJsonString(this));

src/main/java/org/gitlab4j/api/models/EpicIssueLink.java

@@ -3,7 +3,10 @@ package org.gitlab4j.api.models;
 
 import org.gitlab4j.api.utils.JacksonJson;
 
-public class EpicIssueLink {
+import java.io.Serializable;
+
+public class EpicIssueLink implements Serializable {
+    private static final long serialVersionUID = 1L;
 
     private Long id;
     private Integer relativePosition;

src/main/java/org/gitlab4j/api/models/Event.java

 
 package org.gitlab4j.api.models;
 
-import java.util.Date;
-
 import org.gitlab4j.api.Constants.TargetType;
 import org.gitlab4j.api.utils.JacksonJson;
 
-public class Event {
+import java.io.Serializable;
+import java.util.Date;
+
+public class Event implements Serializable {
+    private static final long serialVersionUID = 1L;
 
     private Long id;
     private String actionName;

src/main/java/org/gitlab4j/api/models/EventData.java

 
 package org.gitlab4j.api.models;
 
-import java.util.List;
-
 import org.gitlab4j.api.utils.JacksonJson;
 
-public class EventData {
+import java.io.Serializable;
+import java.util.List;
+
+public class EventData implements Serializable {
+    private static final long serialVersionUID = 1L;
 
     private String after;
     private String before;

src/main/java/org/gitlab4j/api/models/ExportStatus.java

 package org.gitlab4j.api.models;
 
-import java.util.Date;
-import java.util.Map;
-
-import org.gitlab4j.api.utils.JacksonJson;
-import org.gitlab4j.api.utils.JacksonJsonEnumHelper;
-
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonIgnore;
 import com.fasterxml.jackson.annotation.JsonProperty;
 import com.fasterxml.jackson.annotation.JsonValue;
+import org.gitlab4j.api.utils.JacksonJson;
+import org.gitlab4j.api.utils.JacksonJsonEnumHelper;
+
+import java.io.Serializable;
+import java.util.Date;
+import java.util.Map;
 
-public class ExportStatus {
+public class ExportStatus implements Serializable {
+    private static final long serialVersionUID = 1L;
 
     /**
      * Enum representing the status of the export.

src/main/java/org/gitlab4j/api/models/ExternalStatusCheck.java

@@ -2,9 +2,11 @@ package org.gitlab4j.api.models;
 
 import org.gitlab4j.api.utils.JacksonJson;
 
+import java.io.Serializable;
 import java.util.List;
 
-public class ExternalStatusCheck {
+public class ExternalStatusCheck implements Serializable {
+    private static final long serialVersionUID = 1L;
 
     private Long id;
     private String name;

src/main/java/org/gitlab4j/api/models/ExternalStatusCheckProtectedBranch.java

 
 package org.gitlab4j.api.models;
 
+import java.io.Serializable;
 import java.util.Date;
 import java.util.List;
 
 import org.gitlab4j.api.utils.JacksonJson;
 
-public class ExternalStatusCheckProtectedBranch {
+public class ExternalStatusCheckProtectedBranch implements Serializable {
+    private static final long serialVersionUID = 1L;
 
     private Long id;
     private Long projectId;

src/main/java/org/gitlab4j/api/models/ExternalStatusCheckResult.java

@@ -2,7 +2,10 @@ package org.gitlab4j.api.models;
 
 import org.gitlab4j.api.utils.JacksonJson;
 
-public class ExternalStatusCheckResult {
+import java.io.Serializable;
+
+public class ExternalStatusCheckResult implements Serializable {
+    private static final long serialVersionUID = 1L;
 
     private Long id;
     private MergeRequest mergeRequest;

src/main/java/org/gitlab4j/api/models/ExternalStatusCheckStatus.java

@@ -6,7 +6,10 @@ import org.gitlab4j.api.utils.JacksonJsonEnumHelper;
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 
-public class ExternalStatusCheckStatus {
+import java.io.Serializable;
+
+public class ExternalStatusCheckStatus implements Serializable {
+    private static final long serialVersionUID = 1L;
 
     private Long id;
     private String name;
@@ -33,7 +36,7 @@ public class ExternalStatusCheckStatus {
             return (enumHelper.toString(this));
         }
     }
-    
+
     public Long getId() {
         return id;
     }

src/main/java/org/gitlab4j/api/models/FileUpload.java

@@ -2,7 +2,10 @@ package org.gitlab4j.api.models;
 
 import org.gitlab4j.api.utils.JacksonJson;
 
-public class FileUpload {
+import java.io.Serializable;
+
+public class FileUpload implements Serializable {
+    private static final long serialVersionUID = 1L;
 
     private String alt;
     private String url;

src/main/java/org/gitlab4j/api/models/GitLabCiTemplate.java

@@ -2,7 +2,10 @@ package org.gitlab4j.api.models;
 
 import org.gitlab4j.api.utils.JacksonJson;
 
-public class GitLabCiTemplate {
+import java.io.Serializable;
+
+public class GitLabCiTemplate implements Serializable {
+    private static final long serialVersionUID = 1L;
 
     private String name;
     private String content;

src/main/java/org/gitlab4j/api/models/GitLabCiTemplateElement.java

@@ -2,7 +2,10 @@ package org.gitlab4j.api.models;
 
 import org.gitlab4j.api.utils.JacksonJson;
 
-public class GitLabCiTemplateElement {
+import java.io.Serializable;
+
+public class GitLabCiTemplateElement implements Serializable {
+    private static final long serialVersionUID = 1L;
 
     private String key;
     private String name;

src/main/java/org/gitlab4j/api/models/GpgSignature.java

@@ -2,7 +2,10 @@ package org.gitlab4j.api.models;
 
 import org.gitlab4j.api.utils.JacksonJson;
 
-public class GpgSignature {
+import java.io.Serializable;
+
+public class GpgSignature implements Serializable {
+    private static final long serialVersionUID = 1L;
 
     private Long gpgKeyId;
     private String gpgKeyPrimaryKeyid;

src/main/java/org/gitlab4j/api/models/Group.java

@@ -8,6 +8,7 @@ import java.util.Date;
 import java.util.List;
 
 public class Group extends AbstractGroup<Group> {
+    private static final long serialVersionUID = 1L;
 
     public class Statistics {
         private Long storageSize;

src/main/java/org/gitlab4j/api/models/GroupAccessToken.java

@@ -3,6 +3,8 @@ package org.gitlab4j.api.models;
 import org.gitlab4j.api.utils.JacksonJson;
 
 public class GroupAccessToken extends ImpersonationToken {
+    private static final long serialVersionUID = 1L;
+
     private AccessLevel accessLevel;
 
     public AccessLevel getAccessLevel() {

src/main/java/org/gitlab4j/api/models/GroupFilter.java

 package org.gitlab4j.api.models;
 
-import java.util.List;
-
 import org.gitlab4j.api.Constants.GroupOrderBy;
 import org.gitlab4j.api.Constants.SortOrder;
-import org.gitlab4j.api.utils.JacksonJson;
 import org.gitlab4j.api.GitLabApiForm;
+import org.gitlab4j.api.utils.JacksonJson;
+
+import java.io.Serializable;
+import java.util.List;
 
 /**
  *  This class is used to filter Groups when getting lists of groups.
  */
-public class GroupFilter {
+public class GroupFilter implements Serializable {
+    private static final long serialVersionUID = 1L;
 
     private List<Integer> skipGroups;
     private Boolean allAvailable;

src/main/java/org/gitlab4j/api/models/GroupParams.java

@@ -2,12 +2,15 @@ package org.gitlab4j.api.models;
 
 import org.gitlab4j.api.GitLabApiForm;
 
+import java.io.Serializable;
+
 /**
  * This class is utilized by the {@link org.gitlab4j.api.GroupApi#createGroup(GroupParams)}
  * and {@link org.gitlab4j.api.GroupApi#updateGroup(Object, GroupParams)} methods to set
  * the parameters for the call to the GitLab API.
  */
-public class GroupParams {
+public class GroupParams implements Serializable {
+    private static final long serialVersionUID = 1L;
 
     /**
      * Constant to specify the project_creation_level for the group.

src/main/java/org/gitlab4j/api/models/GroupProjectsFilter.java

@@ -5,10 +5,13 @@ import org.gitlab4j.api.Constants.SortOrder;
 import org.gitlab4j.api.utils.JacksonJson;
 import org.gitlab4j.api.GitLabApiForm;
 
+import java.io.Serializable;
+
 /**
  *  This class is used to filter Projects when getting lists of projects for a specified group.
  */
-public class GroupProjectsFilter {
+public class GroupProjectsFilter implements Serializable {
+    private static final long serialVersionUID = 1L;
 
     private Boolean archived;
     private Visibility visibility;
@@ -32,7 +35,7 @@ public class GroupProjectsFilter {
      */
     public GroupProjectsFilter withArchived(Boolean archived) {
         this.archived = archived;
-        return (this);  
+        return (this);
     }
 
     /**
@@ -43,7 +46,7 @@ public class GroupProjectsFilter {
      */
     public GroupProjectsFilter withVisibility(Visibility visibility) {
         this.visibility = visibility;
-        return (this);       
+        return (this);
     }
 
     /**
@@ -80,7 +83,7 @@ public class GroupProjectsFilter {
     }
 
     /**
-     * Return only limited fields for each project. This is a no-op without 
+     * Return only limited fields for each project. This is a no-op without
      * authentication as then only simple fields are returned.
      *
      * @param simple if true, return only limited fields for each project
@@ -115,7 +118,7 @@ public class GroupProjectsFilter {
 
     /**
      *  Include custom attributes in response (admins only).
-     * 
+     *
      * @param withCustomAttributes if true, include custom attributes in the repsonse
      * @return the reference to this ProjectFilter instance
      */

src/main/java/org/gitlab4j/api/models/HealthCheckInfo.java

 package org.gitlab4j.api.models;
 
 import java.io.IOException;
+import java.io.Serializable;
 
 import org.gitlab4j.api.utils.JacksonJson;
 
@@ -12,7 +13,8 @@ import com.fasterxml.jackson.databind.JsonNode;
 import com.fasterxml.jackson.databind.ObjectMapper;
 import com.fasterxml.jackson.databind.annotation.JsonDeserialize;
 
-public class HealthCheckInfo {
+public class HealthCheckInfo implements Serializable {
+    private static final long serialVersionUID = 1L;
 
     @JsonDeserialize(using = HealthCheckItemDeserializer.class)
     private HealthCheckItem dbCheck;

src/main/java/org/gitlab4j/api/models/HealthCheckItem.java

 package org.gitlab4j.api.models;
 
+import java.io.Serializable;
 import java.util.Map;
 
 import org.gitlab4j.api.utils.JacksonJson;
 
-public class HealthCheckItem {
+public class HealthCheckItem implements Serializable {
+    private static final long serialVersionUID = 1L;
+
     private HealthCheckStatus status;
     private Map<String, String> labels;
     private String message;