forbid calling NextId method first

C#.NET/source/Yitter.IdGenerator/YitIdHelper.cs

@@ -34,7 +34,6 @@ namespace Yitter.IdGenerator
         /// <summary>
         /// 生成新的Id
         /// 调用本方法前，请确保调用了 SetIdGenerator 方法做初始化。
-        /// 否则将会初始化一个WorkerId为1的对象。
         /// </summary>
         /// <returns></returns>
         public static long NextId()
@@ -52,6 +51,8 @@ namespace Yitter.IdGenerator
             //    }
             //}
 
+            if (_IdGenInstance == null) throw new ApplicationException("Please initialize Yitter.IdGeneratorOptions first.");
+
             return _IdGenInstance.NewLong();
         }
 

Go/source/idgen/YitIdHelper.go

@@ -32,7 +32,9 @@ func NextId() int64 {
 	//		idGenerator = NewDefaultIdGenerator(options)
 	//	}
 	//}
-
+	if idGenerator == nil {
+		panic("Please initialize Yitter.IdGeneratorOptions first.")
+	}
 	return idGenerator.NewLong()
 }
 

Java/source/src/main/java/com/github/yitter/idgen/YitIdHelper.java

@@ -19,7 +19,6 @@ public class YitIdHelper {
         return idGenInstance;
     }
 
-
     /**
      * 设置参数，建议程序初始化时执行一次
      */
@@ -38,6 +37,9 @@ public class YitIdHelper {
         // idGenInstance = new DefaultIdGenerator(new IdGeneratorOptions((short) 1));
         // }
 
+        if (idGenInstance == null)
+            throw new IdGeneratorException("Please initialize Yitter.IdGeneratorOptions first.");
+
         return idGenInstance.newLong();
     }
 }