Events are now also implementing Serializable

src/main/java/org/gitlab4j/api/systemhooks/AbstractSystemHookEvent.java

@@ -3,6 +3,7 @@ package org.gitlab4j.api.systemhooks;
 import com.fasterxml.jackson.annotation.JsonIgnore;
 
 public abstract class AbstractSystemHookEvent implements SystemHookEvent {
+    private static final long serialVersionUID = 1L;
 
     private String requestUrl;
     private String requestQueryString;

src/main/java/org/gitlab4j/api/systemhooks/GroupMemberSystemHookEvent.java

@@ -5,6 +5,7 @@ import java.util.Date;
 import org.gitlab4j.api.utils.JacksonJson;
 
 public class GroupMemberSystemHookEvent extends AbstractSystemHookEvent {
+    private static final long serialVersionUID = 1L;
 
     public static final String NEW_GROUP_MEMBER_EVENT = "user_add_to_group";
     public static final String GROUP_MEMBER_REMOVED_EVENT = "user_remove_from_group";

src/main/java/org/gitlab4j/api/systemhooks/GroupSystemHookEvent.java

@@ -5,6 +5,7 @@ import java.util.Date;
 import org.gitlab4j.api.utils.JacksonJson;
 
 public class GroupSystemHookEvent extends AbstractSystemHookEvent {
+    private static final long serialVersionUID = 1L;
 
     public static final String GROUP_CREATE_EVENT = "group_create";
     public static final String GROUP_DESTROY_EVENT = "group_destroy";

src/main/java/org/gitlab4j/api/systemhooks/KeySystemHookEvent.java

@@ -5,7 +5,8 @@ import java.util.Date;
 import org.gitlab4j.api.utils.JacksonJson;
 
 public class KeySystemHookEvent extends AbstractSystemHookEvent {
-    
+    private static final long serialVersionUID = 1L;
+
     public static final String KEY_CREATE_EVENT = "key_create";
     public static final String KEY_DESTROY_EVENT = "key_destroy";
     

src/main/java/org/gitlab4j/api/systemhooks/MergeRequestSystemHookEvent.java

@@ -3,6 +3,7 @@ package org.gitlab4j.api.systemhooks;
 import org.gitlab4j.api.webhook.MergeRequestEvent;
 
 public class MergeRequestSystemHookEvent extends MergeRequestEvent implements SystemHookEvent {
+    private static final long serialVersionUID = 1L;
 
     public static final String X_GITLAB_EVENT = "System Hook";
     public static final String MERGE_REQUEST_EVENT = "merge_request";

src/main/java/org/gitlab4j/api/systemhooks/ProjectSystemHookEvent.java

@@ -6,6 +6,7 @@ import org.gitlab4j.api.models.Visibility;
 import org.gitlab4j.api.utils.JacksonJson;
 
 public class ProjectSystemHookEvent extends AbstractSystemHookEvent {
+    private static final long serialVersionUID = 1L;
 
     public static final String PROJECT_CREATE_EVENT = "project_create";
     public static final String PROJECT_DESTROY_EVENT = "project_destroy";

src/main/java/org/gitlab4j/api/systemhooks/PushSystemHookEvent.java

@@ -4,6 +4,7 @@ import org.gitlab4j.api.utils.JacksonJson;
 import org.gitlab4j.api.webhook.AbstractPushEvent;
 
 public class PushSystemHookEvent extends AbstractPushEvent implements SystemHookEvent {
+    private static final long serialVersionUID = 1L;
 
     public static final String PUSH_EVENT = "push";
 

src/main/java/org/gitlab4j/api/systemhooks/SystemHookEvent.java

 package org.gitlab4j.api.systemhooks;
 
+import java.io.Serializable;
+
 import com.fasterxml.jackson.annotation.JsonIgnore;
 import com.fasterxml.jackson.annotation.JsonSubTypes;
 import com.fasterxml.jackson.annotation.JsonTypeInfo;
@@ -31,7 +33,7 @@ import com.fasterxml.jackson.annotation.JsonTypeInfo;
     @JsonSubTypes.Type(value = RepositorySystemHookEvent.class, name = RepositorySystemHookEvent.REPOSITORY_UPDATE_EVENT),
     @JsonSubTypes.Type(value = MergeRequestSystemHookEvent.class, name = MergeRequestSystemHookEvent.MERGE_REQUEST_EVENT)
 })
-public interface SystemHookEvent {
+public interface SystemHookEvent extends Serializable {
 
     String getEventName();
 

src/main/java/org/gitlab4j/api/systemhooks/TagPushSystemHookEvent.java

@@ -4,6 +4,7 @@ import org.gitlab4j.api.utils.JacksonJson;
 import org.gitlab4j.api.webhook.AbstractPushEvent;
 
 public class TagPushSystemHookEvent extends AbstractPushEvent implements SystemHookEvent {
+    private static final long serialVersionUID = 1L;
 
     public static final String TAG_PUSH_EVENT = "tag_push";
 

src/main/java/org/gitlab4j/api/systemhooks/TeamMemberSystemHookEvent.java

@@ -6,6 +6,7 @@ import org.gitlab4j.api.models.Visibility;
 import org.gitlab4j.api.utils.JacksonJson;
 
 public class TeamMemberSystemHookEvent extends AbstractSystemHookEvent {
+    private static final long serialVersionUID = 1L;
 
     public static final String NEW_TEAM_MEMBER_EVENT = "user_add_to_team";
     public static final String TEAM_MEMBER_REMOVED_EVENT = "user_remove_from_team";

src/main/java/org/gitlab4j/api/systemhooks/UserSystemHookEvent.java

@@ -5,6 +5,7 @@ import java.util.Date;
 import org.gitlab4j.api.utils.JacksonJson;
 
 public class UserSystemHookEvent extends AbstractSystemHookEvent {
+    private static final long serialVersionUID = 1L;
 
     public static final String USER_CREATE_EVENT = "user_create";
     public static final String USER_DESTROY_EVENT = "user_destroy";

src/main/java/org/gitlab4j/api/webhook/AbstractEvent.java

@@ -3,8 +3,9 @@ package org.gitlab4j.api.webhook;
 import com.fasterxml.jackson.annotation.JsonIgnore;
 
 public abstract class AbstractEvent implements Event {
+    private static final long serialVersionUID = 1L;
 
-    private String requestUrl;
+	private String requestUrl;
     private String requestQueryString;
     private String secretToken;
 

src/main/java/org/gitlab4j/api/webhook/BuildEvent.java

@@ -12,6 +12,7 @@ import com.fasterxml.jackson.annotation.JsonIgnore;
  * Job Events</a> is incorrect, this class represents the actual content of the Job Hook event.
  */
 public class BuildEvent extends AbstractEvent {
+    private static final long serialVersionUID = 1L;
 
     public static final String JOB_HOOK_X_GITLAB_EVENT = "Job Hook";
     public static final String OBJECT_KIND = "build";

src/main/java/org/gitlab4j/api/webhook/DeploymentEvent.java

@@ -4,6 +4,7 @@ import org.gitlab4j.api.models.User;
 import org.gitlab4j.api.utils.JacksonJson;
 
 public class DeploymentEvent extends AbstractEvent {
+    private static final long serialVersionUID = 1L;
 
     public static final String X_GITLAB_EVENT = "Deployment Hook";
     public static final String OBJECT_KIND = "deployment";

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

 package org.gitlab4j.api.webhook;
 
+import java.io.Serializable;
+
 import com.fasterxml.jackson.annotation.JsonIgnore;
 import com.fasterxml.jackson.annotation.JsonSubTypes;
 import com.fasterxml.jackson.annotation.JsonTypeInfo;
@@ -21,7 +23,7 @@ import com.fasterxml.jackson.annotation.JsonTypeInfo;
     @JsonSubTypes.Type(value = DeploymentEvent.class, name = DeploymentEvent.OBJECT_KIND),
     @JsonSubTypes.Type(value = ReleaseEvent.class, name = ReleaseEvent.OBJECT_KIND)
 })
-public interface Event {     
+public interface Event extends Serializable {
     String getObjectKind();
 
     void setRequestUrl(String url);

src/main/java/org/gitlab4j/api/webhook/IssueEvent.java

@@ -7,6 +7,7 @@ import org.gitlab4j.api.models.User;
 import org.gitlab4j.api.utils.JacksonJson;
 
 public class IssueEvent extends AbstractEvent {
+    private static final long serialVersionUID = 1L;
 
     public static final String X_GITLAB_EVENT = "Issue Hook";
     public static final String OBJECT_KIND = "issue";

src/main/java/org/gitlab4j/api/webhook/JobEvent.java

@@ -8,6 +8,7 @@ import org.gitlab4j.api.utils.JacksonJson;
 import com.fasterxml.jackson.annotation.JsonIgnore;
 
 public class JobEvent extends AbstractEvent {
+    private static final long serialVersionUID = 1L;
 
     public static final String JOB_HOOK_X_GITLAB_EVENT = "Job Hook";
     public static final String OBJECT_KIND = "job";

src/main/java/org/gitlab4j/api/webhook/MergeRequestEvent.java

@@ -8,6 +8,7 @@ import org.gitlab4j.api.models.User;
 import org.gitlab4j.api.utils.JacksonJson;
 
 public class MergeRequestEvent extends AbstractEvent {
+    private static final long serialVersionUID = 1L;
 
     public static final String X_GITLAB_EVENT = "Merge Request Hook";
     public static final String OBJECT_KIND = "merge_request";

src/main/java/org/gitlab4j/api/webhook/NoteEvent.java

@@ -11,6 +11,7 @@ import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 
 public class NoteEvent extends AbstractEvent {
+    private static final long serialVersionUID = 1L;
 
     public static final String X_GITLAB_EVENT = "Note Hook";
     public static final String OBJECT_KIND = "note";

src/main/java/org/gitlab4j/api/webhook/PipelineEvent.java

@@ -9,6 +9,7 @@ import org.gitlab4j.api.models.Variable;
 import org.gitlab4j.api.utils.JacksonJson;
 
 public class PipelineEvent extends AbstractEvent {
+    private static final long serialVersionUID = 1L;
 
     public static final String X_GITLAB_EVENT = "Pipeline Hook";
     public static final String OBJECT_KIND = "pipeline";