diff --git a/src/main/java/org/ntlab/amaryllis/server/entities/AbstractJson.java b/src/main/java/org/ntlab/amaryllis/server/entities/AbstractJson.java
new file mode 100644
index 0000000..f47f525
--- /dev/null
+++ b/src/main/java/org/ntlab/amaryllis/server/entities/AbstractJson.java
@@ -0,0 +1,5 @@
+package org.ntlab.amaryllis.server.entities;
+
+public abstract class AbstractJson {
+
+}