Fix handling of encoded URLs in Class-Path manifest attribute

Fixes gh-18410

Author: wilkinsona

spring-boot-project/spring-boot-devtools/src/main/java/org/springframework/boot/devtools/restart/ChangeableUrls.java

@@ -22,6 +22,7 @@
 import java.net.MalformedURLException;
 import java.net.URL;
 import java.net.URLClassLoader;
+import java.net.URLDecoder;
 import java.util.ArrayList;
 import java.util.Collection;
 import java.util.Collections;
@@ -156,7 +157,13 @@ private static List<URL> getUrlsFromManifestClassPathAttribute(URL jarUrl, JarFi
 					urls.add(referenced);
 				}
 				else {
-					nonExistentEntries.add(referenced);
+					referenced = new URL(jarUrl, URLDecoder.decode(entry, "UTF-8"));
+					if (new File(referenced.getFile()).exists()) {
+						urls.add(referenced);
+					}
+					else {
+						nonExistentEntries.add(referenced);
+					}
 				}
 			}
 			catch (MalformedURLException ex) {

spring-boot-project/spring-boot-devtools/src/test/java/org/springframework/boot/devtools/restart/ChangeableUrlsTests.java

@@ -82,14 +82,17 @@ public void urlsFromJarClassPathAreConsidered() throws Exception {
 		File relative = this.temporaryFolder.newFolder();
 		URL absoluteUrl = this.temporaryFolder.newFolder().toURI().toURL();
 		File jarWithClassPath = makeJarFileWithUrlsInManifestClassPath("project-core/target/classes/",
-				"project-web/target/classes/", "does-not-exist/target/classes", relative.getName() + "/", absoluteUrl);
+				"project-web/target/classes/", "project%20space/target/classes/", "does-not-exist/target/classes/",
+				relative.getName() + "/", absoluteUrl);
 		new File(jarWithClassPath.getParentFile(), "project-core/target/classes").mkdirs();
 		new File(jarWithClassPath.getParentFile(), "project-web/target/classes").mkdirs();
+		new File(jarWithClassPath.getParentFile(), "project space/target/classes").mkdirs();
 		ChangeableUrls urls = ChangeableUrls.fromClassLoader(
 				new URLClassLoader(new URL[] { jarWithClassPath.toURI().toURL(), makeJarFileWithNoManifest() }));
 		assertThat(urls.toList()).containsExactly(
 				new URL(jarWithClassPath.toURI().toURL(), "project-core/target/classes/"),
-				new URL(jarWithClassPath.toURI().toURL(), "project-web/target/classes/"), relative.toURI().toURL(),
+				new URL(jarWithClassPath.toURI().toURL(), "project-web/target/classes/"),
+				new URL(jarWithClassPath.toURI().toURL(), "project space/target/classes/"), relative.toURI().toURL(),
 				absoluteUrl);
 	}