diff --git a/pom.xml b/pom.xml
index 97be8ed..0b944fb 100644
--- a/pom.xml
+++ b/pom.xml
@@ -122,6 +122,13 @@
       <type>jar</type>
     </dependency>
     
+	<!-- https://mvnrepository.com/artifact/org.apache.maven.plugins/maven-surefire-plugin -->
+	<dependency>
+	    <groupId>org.apache.maven.plugins</groupId>
+	    <artifactId>maven-surefire-plugin</artifactId>
+	    <version>2.22.2</version>
+	</dependency>
+         
     <!-- for JUnit test -->
     <dependency>
       <groupId>org.hamcrest</groupId>
@@ -233,16 +240,15 @@
       <!-- mvn test -->
       <plugin>
         <groupId>org.apache.maven.plugins</groupId>
-        <artifactId>maven-surefire-plugin</artifactId>
+	    <artifactId>maven-surefire-plugin</artifactId>
+	    <version>2.22.2</version>
         <configuration>
           <junitArtifactName>junit:junit</junitArtifactName>
           <encoding>UTF-8</encoding>
-          <inputEncoding>UTF-8</inputEncoding>
-          <outputEncoding>UTF-8</outputEncoding>
           <argLine>-Dfile.encoding=UTF-8</argLine>
         </configuration>
       </plugin>
-
+      
       <!-- mvn release:prepare -->
       <!-- mvn release:perform -Dmaven.javadoc.skip -->
       <plugin>
diff --git a/src/main/java/osm/jp/gpx/GpxParser.java b/src/main/java/osm/jp/gpx/GpxParser.java
index ea4c71f..228e686 100644
--- a/src/main/java/osm/jp/gpx/GpxParser.java
+++ b/src/main/java/osm/jp/gpx/GpxParser.java
@@ -78,10 +78,10 @@
 			for (int i = 0; i < atts.getLength(); i++) {
 				String aname = atts.getQName(i);
 				if (aname.equals("lat")) {
-					lat = new Double(atts.getValue(i));
+					lat = Double.valueOf(atts.getValue(i));
 				}
 				if (aname.equals("lon")) {
-					lon = new Double(atts.getValue(i));
+					lon = Double.valueOf(atts.getValue(i));
 				}
 			}
 			
diff --git a/src/main/java/osm/jp/hayashi/tools/log/LoggerFactory.java b/src/main/java/osm/jp/hayashi/tools/log/LoggerFactory.java
index ac57164..6574677 100755
--- a/src/main/java/osm/jp/hayashi/tools/log/LoggerFactory.java
+++ b/src/main/java/osm/jp/hayashi/tools/log/LoggerFactory.java
@@ -2,17 +2,10 @@
 
 import java.io.FileInputStream;
 import java.io.IOException;
-import java.io.InputStream;
-import java.net.URISyntaxException;
-import java.nio.file.Files;
-import java.nio.file.Path;
-import java.nio.file.Paths;
 import java.util.logging.FileHandler;
 import java.util.logging.LogManager;
 import java.util.logging.Logger;
 
-import osm.jp.hayashi.tools.files.Directory;
-
 /**
  * ロギングファイルに動作ログを出力する簡単なモデル
  * "log"+日時+".log"ファイルに出力される。
diff --git a/src/test/java/osm/jp/gpx/ElementMapTRKPTTest.java b/src/test/java/osm/jp/gpx/ElementMapTRKPTTest.java
index 6820b27..92a3f01 100644
--- a/src/test/java/osm/jp/gpx/ElementMapTRKPTTest.java
+++ b/src/test/java/osm/jp/gpx/ElementMapTRKPTTest.java
@@ -94,7 +94,7 @@
         };
 
         TagTrkpt createElement(String[] values) throws ParseException {
-        	TagTrkpt trkpt = new TagTrkpt(new Double(values[1]), new Double(values[2]));
+        	TagTrkpt trkpt = new TagTrkpt(Double.valueOf(values[1]), Double.valueOf(values[2]));
             trkpt.setTime(ImportPicture.toUTCDate(values[0]));
             if (values[3] != null) {
                 trkpt.setEle(values[3]);
@@ -147,29 +147,29 @@
             TagTrkpt tag = map.getValue(ImportPicture.toUTCDate("2017-05-29T01:23:18Z"));
             assertThat(sdf.format(tag.time), is("2017-05-29T10:23:18Z"));
             assertThat(tag.eleStr, is(nullValue()));
-            assertThat(tag.lat, is(new Double(values[0][1])));
-            assertThat(tag.lon, is(new Double(values[0][2])));
-            assertThat(tag.magvarStr, is(nullValue()));
+            assertThat(tag.lat, is(Double.valueOf(values[0][1])));
+            assertThat(tag.lon, is(Double.valueOf(values[0][2])));
+            assertNull(tag.magvarStr);
         }
 
         @Test
         public void get_19() throws ParseException {
             TagTrkpt tag = map.getValue(ImportPicture.toUTCDate("2017-05-29T01:23:19Z"));
             assertThat(sdf.format(tag.time), is("2017-05-29T10:23:18Z"));
-            assertThat(tag.eleStr, is(nullValue()));
-            assertThat(tag.lat, is(new Double(values[0][1])));
-            assertThat(tag.lon, is(new Double(values[0][2])));
-            assertThat(tag.magvarStr, is(nullValue()));
+            assertNull(tag.eleStr);
+            assertThat(tag.lat, is(Double.valueOf(values[0][1])));
+            assertThat(tag.lon, is(Double.valueOf(values[0][2])));
+            assertNull(tag.magvarStr);
         }
 
         @Test
         public void get_20() throws ParseException {
             TagTrkpt tag = map.getValue(ImportPicture.toUTCDate("2017-05-29T01:23:20Z"));
             assertThat(sdf.format(tag.time), is("2017-05-29T10:23:18Z"));
-            assertThat(tag.eleStr, is(nullValue()));
-            assertThat(tag.lat, is(new Double(values[0][1])));
-            assertThat(tag.lon, is(new Double(values[0][2])));
-            assertThat(tag.magvarStr, is(nullValue()));
+            assertNull(tag.eleStr);
+            assertThat(tag.lat, is(Double.valueOf(values[0][1])));
+            assertThat(tag.lon, is(Double.valueOf(values[0][2])));
+            assertNull(tag.magvarStr);
         }
 
         @Test
@@ -177,9 +177,9 @@
             TagTrkpt tag = map.getValue(ImportPicture.toUTCDate("2017-05-29T01:23:21Z"));
             assertThat(sdf.format(tag.time), is("2017-05-29T10:23:21Z"));
             assertThat(tag.eleStr, is("614.90"));
-            assertThat(tag.lat, is(new Double(values[1][1])));
-            assertThat(tag.lon, is(new Double(values[1][2])));
-            assertThat(tag.magvarStr, is(notNullValue()));
+            assertThat(tag.lat, is(Double.valueOf(values[1][1])));
+            assertThat(tag.lon, is(Double.valueOf(values[1][2])));
+            assertNotNull(tag.magvarStr);
         }
 
         @Test
@@ -187,9 +187,9 @@
             TagTrkpt tag = map.getValue(ImportPicture.toUTCDate("2017-05-29T01:23:22Z"));
             assertThat(sdf.format(tag.time), is("2017-05-29T10:23:21Z"));
             assertThat(tag.eleStr, is("614.90"));
-            assertThat(tag.lat, is(new Double(values[1][1])));
-            assertThat(tag.lon, is(new Double(values[1][2])));
-            assertThat(tag.magvarStr, is(notNullValue()));
+            assertThat(tag.lat, is(Double.valueOf(values[1][1])));
+            assertThat(tag.lon, is(Double.valueOf(values[1][2])));
+            assertNotNull(tag.magvarStr);
         }
 
         @Test
@@ -197,9 +197,9 @@
             TagTrkpt tag = map.getValue(ImportPicture.toUTCDate("2017-05-29T01:23:23Z"));
             assertThat(sdf.format(tag.time), is("2017-05-29T10:23:21Z"));
             assertThat(tag.eleStr, is("614.90"));
-            assertThat(tag.lat, is(new Double(values[1][1])));
-            assertThat(tag.lon, is(new Double(values[1][2])));
-            assertThat(tag.magvarStr, is(notNullValue()));
+            assertThat(tag.lat, is(Double.valueOf(values[1][1])));
+            assertThat(tag.lon, is(Double.valueOf(values[1][2])));
+            assertNotNull(tag.magvarStr);
         }
 
         @Test
@@ -207,8 +207,8 @@
             TagTrkpt tag = map.getValue(ImportPicture.toUTCDate("2017-05-29T01:23:24Z"));
             assertThat(sdf.format(tag.time), is("2017-05-29T10:23:24Z"));
             assertThat(tag.eleStr, is("615.00"));
-            assertThat(tag.lat, is(new Double(values[2][1])));
-            assertThat(tag.lon, is(new Double(values[2][2])));
+            assertThat(tag.lat, is(Double.valueOf(values[2][1])));
+            assertThat(tag.lon, is(Double.valueOf(values[2][2])));
             assertThat(tag.magvarStr, is(notNullValue()));
         }
 
@@ -217,8 +217,8 @@
             TagTrkpt tag = map.getValue(ImportPicture.toUTCDate("2017-05-29T01:23:25Z"));
             assertThat(sdf.format(tag.time), is("2017-05-29T10:23:24Z"));
             assertThat(tag.eleStr, is("615.00"));
-            assertThat(tag.lat, is(new Double(values[2][1])));
-            assertThat(tag.lon, is(new Double(values[2][2])));
+            assertThat(tag.lat, is(Double.valueOf(values[2][1])));
+            assertThat(tag.lon, is(Double.valueOf(values[2][2])));
             assertThat(tag.magvarStr, is(notNullValue()));
         }
 
@@ -227,8 +227,8 @@
             TagTrkpt tag = map.getValue(ImportPicture.toUTCDate("2017-05-29T01:23:26Z"));
             assertThat(sdf.format(tag.time), is("2017-05-29T10:23:24Z"));
             assertThat(tag.eleStr, is("615.00"));
-            assertThat(tag.lat, is(new Double(values[2][1])));
-            assertThat(tag.lon, is(new Double(values[2][2])));
+            assertThat(tag.lat, is(Double.valueOf(values[2][1])));
+            assertThat(tag.lon, is(Double.valueOf(values[2][2])));
             assertThat(tag.magvarStr, is(notNullValue()));
         }
 
@@ -237,9 +237,9 @@
             TagTrkpt tag = map.getValue(ImportPicture.toUTCDate("2017-05-29T01:23:27Z"));
             assertThat(sdf.format(tag.time), is("2017-05-29T10:23:27Z"));
             assertThat(tag.eleStr, is("615.03"));
-            assertThat(tag.lat, is(new Double(values[3][1])));
-            assertThat(tag.lon, is(new Double(values[3][2])));
-            assertThat(tag.magvarStr, is(notNullValue()));
+            assertThat(tag.lat, is(Double.valueOf(values[3][1])));
+            assertThat(tag.lon, is(Double.valueOf(values[3][2])));
+            assertNotNull(tag.magvarStr);
         }
 
         @Test
@@ -247,8 +247,8 @@
             TagTrkpt tag = map.getValue(ImportPicture.toUTCDate("2017-05-29T01:23:28Z"));
             assertThat(sdf.format(tag.time), is("2017-05-29T10:23:27Z"));
             assertThat(tag.eleStr, is("615.03"));
-            assertThat(tag.lat, is(new Double(values[3][1])));
-            assertThat(tag.lon, is(new Double(values[3][2])));
+            assertThat(tag.lat, is(Double.valueOf(values[3][1])));
+            assertThat(tag.lon, is(Double.valueOf(values[3][2])));
             assertThat(tag.magvarStr, is(notNullValue()));
         }
 
@@ -257,8 +257,8 @@
             TagTrkpt tag = map.getValue(ImportPicture.toUTCDate("2017-05-29T01:23:30Z"));
             assertThat(sdf.format(tag.time), is("2017-05-29T10:23:27Z"));
             assertThat(tag.eleStr, is("615.03"));
-            assertThat(tag.lat, is(new Double(values[3][1])));
-            assertThat(tag.lon, is(new Double(values[3][2])));
+            assertThat(tag.lat, is(Double.valueOf(values[3][1])));
+            assertThat(tag.lon, is(Double.valueOf(values[3][2])));
             assertThat(tag.magvarStr, is(notNullValue()));
         }