diff --git a/src/main/java/org/ntlab/tampoposerver/models/Activity.java b/src/main/java/org/ntlab/tampoposerver/models/Activity.java
new file mode 100644
index 0000000..efe82b0
--- /dev/null
+++ b/src/main/java/org/ntlab/tampoposerver/models/Activity.java
@@ -0,0 +1,4 @@
+package org.ntlab.tampoposerver.models;
+
+public class Activity {
+}