Monkey with JarUrlConnection to make it work when LANG unset

The problem all along has been in AsciiBytes, so the fix in
commit ce3aaf was just a stop gap for a system where multi-byte
characters are supported but the default encoding is not UTF-8 (e.g.
most Windows systems). The real solution is not to leave it to
chance and always pick an encoding for the JarEntry names (i.e.
in AsciiBytes).

Fixes gh-764

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

@@ -22,9 +22,10 @@ import java.io.IOException;
 import java.io.InputStream;
 import java.net.MalformedURLException;
 import java.net.URL;
-import java.nio.charset.Charset;
 import java.util.jar.Manifest;
 
+import org.springframework.boot.loader.util.AsciiBytes;
+
 /**
  * {@link java.net.JarURLConnection} used to support {@link JarFile#getUrl()}.
  *
@@ -65,11 +66,11 @@ class JarURLConnection extends java.net.JarURLConnection {
 		 * sensible for #getJarFileURL().
 		 */
 		if (separator + SEPARATOR.length() != spec.length()) {
-			this.jarFileUrl = new URL("jar:" + spec);
 			this.jarEntryName = decode(spec.substring(separator + 2));
+			this.jarFileUrl = new URL("jar:" + spec.substring(0, separator) + SEPARATOR
+					+ this.jarEntryName);
 		}
 		else {
-			// The root of the archive (!/)
 			this.jarFileUrl = new URL("jar:" + spec.substring(0, separator));
 		}
 	}
@@ -182,7 +183,8 @@ class JarURLConnection extends java.net.JarURLConnection {
 			}
 			bos.write(ch);
 		}
-		return new String(bos.toByteArray(), Charset.defaultCharset());
+		// AsciiBytes is what is used to store the JarEntries so make it symmetric
+		return new AsciiBytes(bos.toByteArray()).toString();
 
 	}
 

spring-boot-tools/spring-boot-loader/src/main/java/org/springframework/boot/loader/util/AsciiBytes.java

@@ -45,7 +45,7 @@ public final class AsciiBytes {
 	 * @param string
 	 */
 	public AsciiBytes(String string) {
-		this(string.getBytes());
+		this(string.getBytes(UTF_8));
 		this.string = string;
 	}
 
@@ -125,7 +125,7 @@ public final class AsciiBytes {
 		if (string == null || string.length() == 0) {
 			return this;
 		}
-		return append(string.getBytes());
+		return append(string.getBytes(UTF_8));
 	}
 
 	public AsciiBytes append(byte[] bytes) {

spring-boot-tools/spring-boot-loader/src/test/java/org/springframework/boot/loader/jar/JarFileTests.java

@@ -91,6 +91,8 @@ public class JarFileTests {
 		URLClassLoader urlClassLoader = new URLClassLoader(new URL[] { jarUrl });
 		assertThat(urlClassLoader.getResource("special/\u00EB.dat"), notNullValue());
 		assertThat(urlClassLoader.getResource("d/9.dat"), notNullValue());
+		jarFile.close();
+		urlClassLoader.close();
 	}
 
 	@Test
@@ -133,6 +135,7 @@ public class JarFileTests {
 		URLClassLoader urlClassLoader = new URLClassLoader(
 				new URL[] { this.jarFile.getUrl() });
 		assertThat(urlClassLoader.getResource("special/\u00EB.dat"), notNullValue());
+		urlClassLoader.close();
 	}
 
 	@Test
@@ -365,5 +368,6 @@ public class JarFileTests {
 						jarEntry.getCertificates());
 			}
 		}
+		jarFile.close();
 	}
 }