diff --git a/dlqrcode/src/lib.rs b/dlqrcode/src/lib.rs
index a82b170..5776944 100644
--- a/dlqrcode/src/lib.rs
+++ b/dlqrcode/src/lib.rs
@@ -27,7 +27,9 @@
 static MASTER_IV: [u8; 16] = [0u8; 16];
 
 fn setup_logger() -> bool {
-    SimpleLogger::new().init().unwrap();
+    if let Err(_) = SimpleLogger::new().init() {
+        ()
+    }
     true
 }
 
diff --git a/dlsmk/Cargo.toml b/dlsmk/Cargo.toml
index eb237b5..36f8865 100644
--- a/dlsmk/Cargo.toml
+++ b/dlsmk/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "dlsmk"
-version = "0.1.0"
+version = "0.1.1"
 authors = ["Tang Cheng <cheng.tang@supwisdom.com>"]
 edition = "2018"
 
diff --git a/java/src/main/java/com/supwisdom/dlsmk/DLSMK.java b/java/src/main/java/com/supwisdom/dlsmk/DLSMK.java
index d168587..1290361 100644
--- a/java/src/main/java/com/supwisdom/dlsmk/DLSMK.java
+++ b/java/src/main/java/com/supwisdom/dlsmk/DLSMK.java
@@ -1,13 +1,5 @@
 package com.supwisdom.dlsmk;
 
-import com.eatthepath.otp.TimeBasedOneTimePasswordGenerator;
-
-import javax.crypto.SecretKey;
-import javax.crypto.spec.SecretKeySpec;
-import java.security.InvalidKeyException;
-import java.security.NoSuchAlgorithmException;
-import java.time.Duration;
-import java.time.Instant;
 import java.util.HashMap;
 import java.util.Map;