diff --git a/src/main/java/com/example/jerseyexercise/resources/Gack.java b/src/main/java/com/example/jerseyexercise/resources/Gack.java
new file mode 100644
index 0000000..866e21b
--- /dev/null
+++ b/src/main/java/com/example/jerseyexercise/resources/Gack.java
@@ -0,0 +1,25 @@
+package com.example.jerseyexercise.resources;
+
+import org.springframework.stereotype.Component;
+
+import javax.ws.rs.*;
+import javax.ws.rs.core.*;
+
+@Component
+@Path("/helloGakuworld")
+public class Gack {
+    private String message = "Hello World!!";
+
+    @GET
+    @Produces(MediaType.TEXT_PLAIN)
+    public String getMessage() {
+        return message;
+    }
+
+    @PUT
+    @Produces(MediaType.TEXT_PLAIN)
+    public String setMessage(@QueryParam("message") String m) {
+        message = m;
+        return "Success!!";
+    }
+}