diff --git a/src/baleine/common/interface/client/IComToData.java b/src/baleine/common/interface/client/IComToData.java
new file mode 100644
index 0000000000000000000000000000000000000000..f90da59de7f18aafcd8496ab4751cabc8442d344
--- /dev/null
+++ b/src/baleine/common/interface/client/IComToData.java
@@ -0,0 +1,5 @@
+package baleine.common.interface.client;
+
+public interface IComToData {
+
+}
diff --git a/src/baleine/common/interface/client/IDataToCom.java b/src/baleine/common/interface/client/IDataToCom.java
new file mode 100644
index 0000000000000000000000000000000000000000..77dad98493f40289bc8a5c8481f5f0d70abc1934
--- /dev/null
+++ b/src/baleine/common/interface/client/IDataToCom.java
@@ -0,0 +1,5 @@
+package baleine.common.interface.client;
+
+public interface IDataToCom {
+
+}
diff --git a/src/baleine/common/interface/server/IComToData.java b/src/baleine/common/interface/server/IComToData.java
index e69de29bb2d1d6434b8b29ae775ad8c2e48c5391..3c72348ec4e69204ad79791b55a37698de230ee6 100644
--- a/src/baleine/common/interface/server/IComToData.java
+++ b/src/baleine/common/interface/server/IComToData.java
@@ -0,0 +1,5 @@
+package baleine.common.interface.server;
+
+public interface IComToData {
+
+}
diff --git a/src/baleine/common/interface/server/IDataToCom.java b/src/baleine/common/interface/server/IDataToCom.java
index e69de29bb2d1d6434b8b29ae775ad8c2e48c5391..725a078df30346e1d2e520b3f1915fa7e86b761e 100644
--- a/src/baleine/common/interface/server/IDataToCom.java
+++ b/src/baleine/common/interface/server/IDataToCom.java
@@ -0,0 +1,5 @@
+package baleine.common.interface.server;
+
+public interface IDataToCom {
+
+}