Remove duplicates members in child classes, add "@Override" annotation

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

@@ -34,6 +34,7 @@ public String toValue() {
             return (enumHelper.toString(this));
         }
 
+        @Override
         public String toString() {
             return (enumHelper.toString(this));
         }
@@ -241,6 +242,7 @@ public String getLinkByName(String name) {
         return (links.get(name));
     }
 
+    @Override
     public String toString() {
         return (JacksonJson.toJsonString(this));
     }

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

@@ -77,6 +77,7 @@ public void setUrl(String url) {
         this.url = url;
     }
 
+    @Override
     public String toString() {
         return (JacksonJson.toJsonString(this));
     }

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

@@ -5,6 +5,7 @@
 public class ChildEpic extends AbstractEpic<ChildEpic> {
     private static final long serialVersionUID = 1L;
 
+    @Override
     public String toString() {
         return (JacksonJson.toJsonString(this));
     }

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

@@ -7,7 +7,6 @@ public class CreatedChildEpic extends AbstractMinimalEpic<CreatedChildEpic> {
 
     private Boolean hasChildren;
     private Boolean hasIssues;
-    private String url;
     private String relationUrl;
 
     public Boolean getHasChildren() {
@@ -26,14 +25,6 @@ public void setHasIssues(Boolean hasIssues) {
         this.hasIssues = hasIssues;
     }
 
-    public String getUrl() {
-        return url;
-    }
-
-    public void setUrl(String url) {
-        this.url = url;
-    }
-
     public String getRelationUrl() {
         return relationUrl;
     }
@@ -42,6 +33,7 @@ public void setRelationUrl(String relationUrl) {
         this.relationUrl = relationUrl;
     }
 
+    @Override
     public String toString() {
         return (JacksonJson.toJsonString(this));
     }

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

@@ -49,6 +49,7 @@ public void setSubscribed(Boolean subscribed) {
         this.subscribed = subscribed;
     }
 
+    @Override
     public String toString() {
         return (JacksonJson.toJsonString(this));
     }

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

@@ -5,6 +5,7 @@
 public class EpicInLink extends AbstractEpic<EpicInLink> {
     private static final long serialVersionUID = 1L;
 
+    @Override
     public String toString() {
         return (JacksonJson.toJsonString(this));
     }

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

@@ -5,6 +5,7 @@
 public class IssueEpic extends AbstractMinimalEpic<IssueEpic> {
     private static final long serialVersionUID = 1L;
 
+    @Override
     public String toString() {
         return (JacksonJson.toJsonString(this));
     }

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

@@ -76,6 +76,7 @@ public void setLinkUpdatedAt(Date linkUpdatedAt) {
         this.linkUpdatedAt = linkUpdatedAt;
     }
 
+    @Override
     public String toString() {
         return (JacksonJson.toJsonString(this));
     }

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

@@ -63,6 +63,7 @@ public void setUpdatedAt(Date updatedAt) {
         this.updatedAt = updatedAt;
     }
 
+    @Override
     public String toString() {
         return (JacksonJson.toJsonString(this));
     }

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

@@ -12,6 +12,7 @@ public enum Type {
         BLOB,
         COMMIT;
 
+        @Override
         public String toString() {
             return (name().toLowerCase());
         }

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

@@ -33,7 +33,6 @@ public class User extends AbstractUser<User> {
     private String publicEmail;
     private Integer sharedRunnersMinutesLimit;
     private String skype;
-    private String state;
     private Integer themeId;
     private String twitter;
     private Boolean twoFactorEnabled;
@@ -232,14 +231,6 @@ public void setSkype(String skype) {
         this.skype = skype;
     }
 
-    public String getState() {
-        return state;
-    }
-
-    public void setState(String state) {
-        this.state = state;
-    }
-
     public Integer getThemeId() {
         return themeId;
     }
@@ -398,11 +389,6 @@ public User withSkype(String skype) {
         return this;
     }
 
-    public User withState(String state) {
-        this.state = state;
-        return this;
-    }
-
     public User withThemeId(Integer themeId) {
         this.themeId = themeId;
         return this;

gitlab4j-models/src/main/java/org/gitlab4j/api/services/HipChatService.java

@@ -13,7 +13,6 @@ public class HipChatService extends NotificationService {
     public static final String ROOM_PROP = "room";
     public static final String API_VERSION_PROP = "api_version";
     public static final String SERVER_PROP = "server";
-    public static final String NOTIFY_ONLY_BROKEN_PIPELINES_PROP = "notify_only_broken_pipelines";
 
     /**
      * Get the form data for this service based on it's properties.

gitlab4j-models/src/main/java/org/gitlab4j/api/services/JiraService.java

@@ -12,7 +12,6 @@ public class JiraService extends NotificationService {
     public static final String URL_PROP = "url";
     public static final String API_URL_PROP = "api_url";
     public static final String PROJECT_KEY_PROP = "project_key";
-    public static final String USERNAME_PROP = "username";
     public static final String JIRA_ISSUE_TRANSITION_ID_PROP = "jira_issue_transition_id";
     public static final String COMMIT_EVENTS_PROP = "commit_events";
 

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

@@ -10,7 +10,6 @@ public class MergeRequestSystemHookEvent extends MergeRequestEvent implements Sy
     public static final String X_GITLAB_EVENT = "System Hook";
     public static final String MERGE_REQUEST_EVENT = "merge_request";
 
-    private String eventType;
     private String eventName;
 
     @Override
@@ -27,14 +26,6 @@ public void setEventName(String eventName) {
         this.eventName = eventName;
     }
 
-    public String getEventType() {
-        return eventType;
-    }
-
-    public void setEventType(String eventType) {
-        this.eventType = eventType;
-    }
-
     /**
      * @deprecated use {@link #setEventType(String)} instead
      * @param eventType