Protect against malformed URLs on Windows

Update JarFile to correctly create system independent URLs to prevent
potential URISyntaxExceptions when running on Windows.

Fixes gh-836

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

@@ -365,11 +365,6 @@ public class JarFile extends java.util.jar.JarFile implements Iterable<JarEntryD
 		throw new IllegalArgumentException("ZipEntry must be contained in this file");
 	}
 
-	@Override
-	public String getName() {
-		return this.name;
-	}
-
 	@Override
 	public int size() {
 		return (int) this.size;
@@ -380,11 +375,6 @@ public class JarFile extends java.util.jar.JarFile implements Iterable<JarEntryD
 		this.rootFile.close();
 	}
 
-	@Override
-	public String toString() {
-		return getName();
-	}
-
 	/**
 	 * Return a URL that can be used to access this JAR file. NOTE: the specified URL
 	 * cannot be serialized and or cloned.
@@ -393,7 +383,26 @@ public class JarFile extends java.util.jar.JarFile implements Iterable<JarEntryD
 	 */
 	public URL getUrl() throws MalformedURLException {
 		Handler handler = new Handler(this);
-		return new URL("jar", "", -1, "file:" + getName() + "!/", handler);
+		String file = "file:" + getName(PathForm.SYSTEM_INDEPENDENT) + "!/";
+		return new URL("jar", "", -1, file, handler);
+	}
+
+	@Override
+	public String toString() {
+		return getName();
+	}
+
+	@Override
+	public String getName() {
+		return getName(PathForm.SYSTEM_DEPENDENT);
+	}
+
+	private String getName(PathForm pathForm) {
+		if (pathForm == PathForm.SYSTEM_INDEPENDENT && File.separatorChar != '/') {
+			return this.name.replace(File.separatorChar, '/');
+		}
+		return this.name;
+
 	}
 
 	/**
@@ -420,4 +429,20 @@ public class JarFile extends java.util.jar.JarFile implements Iterable<JarEntryD
 			// Ignore
 		}
 	}
+
+	/**
+	 * Different forms that paths can be returned.
+	 */
+	private static enum PathForm {
+
+		/**
+		 * Use system dependent paths (i.e. include backslashes on Windows)
+		 */
+		SYSTEM_DEPENDENT,
+
+		/**
+		 * Use system independent paths (i.e. replace backslashes on Windows)
+		 */
+		SYSTEM_INDEPENDENT
+	}
 }

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

@@ -92,7 +92,6 @@ public class JarFileTests {
 		assertThat(urlClassLoader.getResource("special/\u00EB.dat"), notNullValue());
 		assertThat(urlClassLoader.getResource("d/9.dat"), notNullValue());
 		jarFile.close();
-		urlClassLoader.close();
 	}
 
 	@Test
@@ -135,7 +134,6 @@ public class JarFileTests {
 		URLClassLoader urlClassLoader = new URLClassLoader(
 				new URL[] { this.jarFile.getUrl() });
 		assertThat(urlClassLoader.getResource("special/\u00EB.dat"), notNullValue());
-		urlClassLoader.close();
 	}
 
 	@Test