diff --git a/maker/java/src/main/java/org/lionsoul/ip2region/xdb/InvalidInetAddressException.java b/maker/java/src/main/java/org/lionsoul/ip2region/xdb/InvalidInetAddressException.java
index 6e32558..568ef0d 100644
--- a/maker/java/src/main/java/org/lionsoul/ip2region/xdb/InvalidInetAddressException.java
+++ b/maker/java/src/main/java/org/lionsoul/ip2region/xdb/InvalidInetAddressException.java
@@ -1,3 +1,7 @@
+// Copyright 2022 The Ip2Region Authors. All rights reserved.
+// Use of this source code is governed by a Apache2.0-style
+// license that can be found in the LICENSE file.
+
 package org.lionsoul.ip2region.xdb;
 
 public class InvalidInetAddressException extends Exception {
diff --git a/maker/java/src/test/java/org/lionsoul/ip2region/xdb/UtilTest.java b/maker/java/src/test/java/org/lionsoul/ip2region/xdb/UtilTest.java
index d3ef7c9..87663cf 100644
--- a/maker/java/src/test/java/org/lionsoul/ip2region/xdb/UtilTest.java
+++ b/maker/java/src/test/java/org/lionsoul/ip2region/xdb/UtilTest.java
@@ -1,7 +1,5 @@
 package org.lionsoul.ip2region.xdb;
 
-import java.net.UnknownHostException;
-
 import org.junit.Test;
 
 public class UtilTest {