diff --git a/service-configuration/src/main/java/com/lanyuanxiaoyao/service/configuration/entity/yarn/YarnApplication.java b/service-configuration/src/main/java/com/lanyuanxiaoyao/service/configuration/entity/yarn/YarnApplication.java
index f6166cc..ad47ba0 100644
--- a/service-configuration/src/main/java/com/lanyuanxiaoyao/service/configuration/entity/yarn/YarnApplication.java
+++ b/service-configuration/src/main/java/com/lanyuanxiaoyao/service/configuration/entity/yarn/YarnApplication.java
@@ -116,26 +116,61 @@ public final class YarnApplication {
     @Override
     public String toString() {
         return "YarnApplication{" +
-                "cluster='" + cluster + '\'' +
-                ", id='" + id + '\'' +
-                ", user='" + user + '\'' +
-                ", queue='" + queue + '\'' +
-                ", name='" + name + '\'' +
-                ", state='" + state + '\'' +
-                ", finalStatus='" + finalStatus + '\'' +
-                ", progress=" + progress +
-                ", diagnostics='" + diagnostics + '\'' +
-                ", applicationType='" + applicationType + '\'' +
-                ", startedTime=" + startedTime +
-                ", launchTime=" + launchTime +
-                ", finishedTime=" + finishedTime +
-                ", elapsedTime=" + elapsedTime +
-                ", trackingUrl='" + trackingUrl + '\'' +
-                ", allocatedMB=" + allocatedMB +
-                ", allocatedVCores=" + allocatedVCores +
-                ", runningContainers=" + runningContainers +
-                ", queueUsagePercentage=" + queueUsagePercentage +
-                ", clusterUsagePercentage=" + clusterUsagePercentage +
-                '}';
+               "cluster='" + cluster + '\'' +
+               ", id='" + id + '\'' +
+               ", user='" + user + '\'' +
+               ", queue='" + queue + '\'' +
+               ", name='" + name + '\'' +
+               ", state='" + state + '\'' +
+               ", finalStatus='" + finalStatus + '\'' +
+               ", progress=" + progress +
+               ", diagnostics='" + diagnostics + '\'' +
+               ", applicationType='" + applicationType + '\'' +
+               ", startedTime=" + startedTime +
+               ", launchTime=" + launchTime +
+               ", finishedTime=" + finishedTime +
+               ", elapsedTime=" + elapsedTime +
+               ", trackingUrl='" + trackingUrl + '\'' +
+               ", allocatedMB=" + allocatedMB +
+               ", allocatedVCores=" + allocatedVCores +
+               ", runningContainers=" + runningContainers +
+               ", queueUsagePercentage=" + queueUsagePercentage +
+               ", clusterUsagePercentage=" + clusterUsagePercentage +
+               '}';
+    }
+
+    public static final class State {
+        /**
+         * Application which was just created.
+         */
+        public static final String NEW = "NEW";
+        /**
+         * Application which has been submitted.
+         */
+        public static final String NEW_SAVING = "NEW_SAVING";
+        /**
+         * Application which has been submitted.
+         */
+        public static final String SUBMITTED = "SUBMITTED";
+        /**
+         * Application has been accepted by the scheduler
+         */
+        public static final String ACCEPTED = "ACCEPTED";
+        /**
+         * Application which is currently running.
+         */
+        public static final String RUNNING = "RUNNING";
+        /**
+         * Application which finished successfully.
+         */
+        public static final String FINISHED = "FINISHED";
+        /**
+         * Application which failed.
+         */
+        public static final String FAILED = "FAILED";
+        /**
+         * Application which was terminated by a user or admin.
+         */
+        public static final String KILLED = "KILLED";
     }
 }