diff --git a/src/main/java/istlab/KisoJikken/App.java b/src/main/java/istlab/KisoJikken/App.java
index 9873172..4a9df84 100644
--- a/src/main/java/istlab/KisoJikken/App.java
+++ b/src/main/java/istlab/KisoJikken/App.java
@@ -21,6 +21,8 @@
 import javax.swing.SwingUtilities;
 import javax.swing.UIManager;
 
+import org.apache.logging.log4j.LogManager;
+import org.apache.logging.log4j.Logger;
 import org.eclipse.jgit.api.Git;
 import org.eclipse.jgit.api.errors.GitAPIException;
 
@@ -38,6 +40,7 @@
     public static String downloadurl = "https://cit.istlab.info/KisoJikkenNWP/target/";
 
     public static boolean isWindows;
+    static final Logger logger;
 
     static {
         userhome = System.getProperty("user.home");
@@ -45,13 +48,13 @@
                                                                         // https://stackoverflow.com/questions/1701839/string-replaceall-single-backslashes-with-double-backslashes
         String os = System.getProperty("os.name").toLowerCase();
         isWindows = os.contains("windows");
+        logger = LogManager.getLogger(App.class);
     }
 
     // public App() {
     // }
 
     public static void main(String[] args) {
-        
         try {
             App.execPath = getApplicationPath(new App().getClass());
         } catch (URISyntaxException e) {