Make `loader` Windows compatible

The encoding of UTF-8 (et al.) chars in the
JarUrlConnection has to be made explicit, otherwise
Wdinows apparently does not pick the default(?).

Fixes gh-711, Fixes gh-753

spring-boot-tools/spring-boot-loader/src/main/java/org/springframework/boot/loader/jar/JarURLConnection.java

@@ -20,14 +20,14 @@ import java.io.ByteArrayOutputStream;
 import java.io.FileNotFoundException;
 import java.io.IOException;
 import java.io.InputStream;
-import java.io.UnsupportedEncodingException;
 import java.net.MalformedURLException;
 import java.net.URL;
+import java.nio.charset.Charset;
 import java.util.jar.Manifest;
 
 /**
  * {@link java.net.JarURLConnection} used to support {@link JarFile#getUrl()}.
- * 
+ *
  * @author Phillip Webb
  */
 class JarURLConnection extends java.net.JarURLConnection {
@@ -169,25 +169,21 @@ class JarURLConnection extends java.net.JarURLConnection {
 		if ((length == 0) || (source.indexOf('%') < 0)) {
 			return source;
 		}
-		try {
-			ByteArrayOutputStream bos = new ByteArrayOutputStream(length);
-			for (int i = 0; i < length; i++) {
-				int ch = source.charAt(i);
-				if (ch == '%') {
-					if ((i + 2) >= length) {
-						throw new IllegalArgumentException("Invalid encoded sequence \""
-								+ source.substring(i) + "\"");
-					}
-					ch = decodeEscapeSequence(source, i);
-					i += 2;
+		ByteArrayOutputStream bos = new ByteArrayOutputStream(length);
+		for (int i = 0; i < length; i++) {
+			int ch = source.charAt(i);
+			if (ch == '%') {
+				if ((i + 2) >= length) {
+					throw new IllegalArgumentException("Invalid encoded sequence \""
+							+ source.substring(i) + "\"");
 				}
-				bos.write(ch);
+				ch = decodeEscapeSequence(source, i);
+				i += 2;
 			}
-			return new String(bos.toByteArray(), "UTF-8");
-		}
-		catch (UnsupportedEncodingException ex) {
-			throw new IllegalStateException(ex);
+			bos.write(ch);
 		}
+		return new String(bos.toByteArray(), Charset.defaultCharset());
+
 	}
 
 	private static char decodeEscapeSequence(String source, int i) {