Fix detection of application home for paths containing spaces

Fixes gh-20531

spring-boot-project/spring-boot/src/main/java/org/springframework/boot/system/ApplicationHome.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2019 the original author or authors.
+ * Copyright 2012-2020 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -20,6 +20,7 @@ import java.io.File;
 import java.io.IOException;
 import java.io.InputStream;
 import java.net.JarURLConnection;
+import java.net.URISyntaxException;
 import java.net.URL;
 import java.net.URLConnection;
 import java.security.CodeSource;
@@ -116,12 +117,12 @@ public class ApplicationHome {
 		return false;
 	}
 
-	private File findSource(URL location) throws IOException {
+	private File findSource(URL location) throws IOException, URISyntaxException {
 		URLConnection connection = location.openConnection();
 		if (connection instanceof JarURLConnection) {
 			return getRootJarFile(((JarURLConnection) connection).getJarFile());
 		}
-		return new File(location.getPath());
+		return new File(location.toURI());
 	}
 
 	private File getRootJarFile(JarFile jarFile) {

spring-boot-project/spring-boot/src/test/java/org/springframework/boot/system/ApplicationHomeTests.java

@@ -0,0 +1,81 @@
+/*
+ * Copyright 2012-2020 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.boot.system;
+
+import java.io.ByteArrayInputStream;
+import java.io.File;
+import java.io.FileOutputStream;
+import java.net.URL;
+import java.net.URLClassLoader;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Executors;
+
+import net.bytebuddy.ByteBuddy;
+import org.junit.Rule;
+import org.junit.Test;
+import org.junit.rules.TemporaryFolder;
+
+import org.springframework.util.FileCopyUtils;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+/**
+ * Tests for {@link ApplicationHome}.
+ *
+ * @author Andy Wilkinson
+ */
+public class ApplicationHomeTests {
+
+	@Rule
+	public TemporaryFolder temporaryFolder = new TemporaryFolder();
+
+	@Test
+	public void whenSourceClassIsProvidedThenApplicationHomeReflectsItsLocation() throws Exception {
+		File app = this.temporaryFolder.newFolder("app");
+		ApplicationHome applicationHome = createApplicationHome(app);
+		assertThat(applicationHome.getDir()).isEqualTo(app);
+	}
+
+	@Test
+	public void whenSourceClassIsProvidedWithSpaceInItsPathThenApplicationHomeReflectsItsLocation() throws Exception {
+		File app = this.temporaryFolder.newFolder("app location");
+		ApplicationHome applicationHome = createApplicationHome(app);
+		assertThat(applicationHome.getDir()).isEqualTo(app);
+	}
+
+	private ApplicationHome createApplicationHome(File location) throws Exception {
+		File examplePackage = new File(location, "com/example");
+		examplePackage.mkdirs();
+		FileCopyUtils.copy(
+				new ByteArrayInputStream(
+						new ByteBuddy().subclass(Object.class).name("com.example.Source").make().getBytes()),
+				new FileOutputStream(new File(examplePackage, "Source.class")));
+		try (URLClassLoader classLoader = new URLClassLoader(new URL[] { location.toURI().toURL() })) {
+			Class<?> sourceClass = classLoader.loadClass("com.example.Source");
+			// Separate thread to bypass stack-based unit test detection in
+			// ApplicationHome
+			ExecutorService executor = Executors.newSingleThreadExecutor();
+			try {
+				return executor.submit(() -> new ApplicationHome(sourceClass)).get();
+			}
+			finally {
+				executor.shutdown();
+			}
+		}
+	}
+
+}