Issue Jenkins-36718 - Fix DM_DEFAULT_ENCODING scanned by spotbugs

core/src/main/java/hudson/console/ConsoleNote.java

@@ -194,7 +194,7 @@
      * encoding is ASCII compatible.
      */
     public void encodeTo(Writer out) throws IOException {
-        out.write(encodeToBytes().toString());
+        out.write(new String(encodeToBytes().toByteArray(), StandardCharsets.UTF_8));
     }
 
     private ByteArrayOutputStream encodeToBytes() throws IOException {
@@ -224,7 +224,8 @@
      * Works like {@link #encodeTo(Writer)} but obtain the result as a string.
      */
     public String encode() throws IOException {
-        return encodeToBytes().toString();
+        return new String(encodeToBytes().toByteArray(), StandardCharsets.UTF_8);
+        // return encodeToBytes().toString();
     }
 
     /**

core/src/main/java/hudson/lifecycle/WindowsServiceLifecycle.java

@@ -38,6 +38,7 @@
 import java.io.Writer;
 import java.net.URL;
 import java.nio.charset.Charset;
+import java.nio.charset.StandardCharsets;
 import java.nio.file.Files;
 import java.nio.file.StandardOpenOption;
 import java.util.logging.Level;
@@ -145,7 +146,7 @@
         int r = new LocalLauncher(task).launch().cmds(executable, "restart!")
                 .stdout(task).pwd(home).join();
         if (r != 0)
-            throw new IOException(baos.toString());
+            throw new IOException(new String(baos.toByteArray(), StandardCharsets.UTF_8));
     }
 
     private static File getBaseDir() {

core/src/main/java/hudson/util/TextFile.java

@@ -28,7 +28,6 @@
 import hudson.Util;
 import java.io.BufferedReader;
 import java.io.File;
-import java.io.FileReader;
 import java.io.IOException;
 import java.io.PrintWriter;
 import java.io.RandomAccessFile;
@@ -114,7 +113,7 @@ public void write(String text) throws IOException {
     public @NonNull String head(int numChars) throws IOException {
         char[] buf = new char[numChars];
         int read = 0;
-        try (Reader r = new FileReader(file)) {
+        try (Reader r = Files.newBufferedReader(file.toPath(), StandardCharsets.UTF_8)) {
             while (read < numChars) {
                 int d = r.read(buf, read, buf.length - read);
                 if (d < 0)