import java.util.Date;

public class EntityConstants {
  static class AttendeeEntity {
    public static String TABLE_NAME = "Attendee";
    public static String SESSION_ID = "SessionId";
    public static String SCREEN_NAME = "ScreenName";
    public static String TIME_LAST_POLLED = "TimeLastPolled";
  }

  static class InstanceEntity {
    public static String TABLE_NAME = "Instance";
    public static String INSTANCE_NAME = "InstanceName";
    public static String SESSION_ID = "SessionId";
  }

  static class SessionEntity {
    public static String TABLE_NAME = "Session";
    public static String SESSION_ID = "SessionId";
    public static String SCREEN_NAME_OF_CONTROLLER = "SreenNameOfController";
    public static String IP_OF_VM = "IpOfVM";
  }
}
@@ -1,35 +1,114 @@
-import java.util.Date;%0A
+package com.google.sps.data;%0A%0Aimport java.util.Date;%0A%0A/** Class that creates constants for tables. **/
 %0Apublic 
 clas
@@ -103,16 +103,22 @@
 %0Apublic 
+final 
 class En
@@ -133,18 +133,95 @@
 tants %7B%0A
+%0A
   
+/** Class that creates entity constants for the Attendee table. **/%0A  final 
 static c
@@ -245,32 +245,38 @@
 ty %7B%0A    public 
+final 
 static String TA
@@ -301,32 +301,38 @@
 ee%22;%0A    public 
+final 
 static String SE
@@ -358,32 +358,38 @@
 Id%22;%0A    public 
+final 
 static String SC
@@ -417,32 +417,38 @@
 me%22;%0A    public 
+final 
 static String TI
@@ -481,32 +481,108 @@
 Polled%22;%0A  %7D%0A%0A  
+/** Class that creates entity constants for the Instance table. **/%0A  final 
 static class Ins
@@ -598,32 +598,38 @@
 ty %7B%0A    public 
+final 
 static String TA
@@ -654,32 +654,38 @@
 ce%22;%0A    public 
+final 
 static String IN
@@ -717,32 +717,38 @@
 me%22;%0A    public 
+final 
 static String SE
@@ -778,16 +778,91 @@
 %0A  %7D%0A%0A  
+/** Class that creates entity constants for the Session table. **/%0A  final 
 static c
@@ -885,32 +885,38 @@
 ty %7B%0A    public 
+final 
 static String TA
@@ -940,32 +940,38 @@
 on%22;%0A    public 
+final 
 static String SE
@@ -997,32 +997,38 @@
 Id%22;%0A    public 
+final 
 static String SC
@@ -1055,16 +1055,17 @@
 LER = %22S
+c
 reenName
@@ -1090,16 +1090,22 @@
  public 
+final 
 static S

Change fields to final