Fix classpath index so entries match those expected by the launcher

This reverts commit ad164269e9 and adds
some additional tests.

Fixes gh-24192

spring-boot-project/spring-boot-tools/spring-boot-gradle-plugin/src/main/java/org/springframework/boot/gradle/tasks/bundling/BootZipCopyAction.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2020 the original author or authors.
+ * Copyright 2012-2021 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.
@@ -243,7 +243,7 @@ class BootZipCopyAction implements CopyAction {
 			details.copyTo(this.out);
 			this.out.closeArchiveEntry();
 			if (BootZipCopyAction.this.librarySpec.isSatisfiedBy(details)) {
-				this.writtenLibraries.add(name.substring(name.lastIndexOf('/') + 1));
+				this.writtenLibraries.add(name);
 			}
 			if (BootZipCopyAction.this.layerResolver != null) {
 				Layer layer = BootZipCopyAction.this.layerResolver.getLayer(details);

spring-boot-project/spring-boot-tools/spring-boot-gradle-plugin/src/test/java/com/example/bootjar/classpath/BootJarClasspathApplication.java

@@ -0,0 +1,41 @@
+/*
+ * Copyright 2012-2019 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 com.example.bootjar.classpath;
+
+import java.net.URL;
+import java.net.URLClassLoader;
+
+/**
+ * Application used for testing classpath handling with BootJar.
+ *
+ * @author Andy Wilkinson
+ */
+public class BootJarClasspathApplication {
+
+	protected BootJarClasspathApplication() {
+
+	}
+
+	public static void main(String[] args) {
+		int i = 1;
+		ClassLoader classLoader = Thread.currentThread().getContextClassLoader();
+		for (URL url : ((URLClassLoader) classLoader).getURLs()) {
+			System.out.println(i++ + ". " + url.getFile());
+		}
+	}
+
+}

spring-boot-project/spring-boot-tools/spring-boot-gradle-plugin/src/test/java/com/example/bootrun/classpath/BootRunClasspathApplication.java

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package com.example.classpath;
+package com.example.bootrun.classpath;
 
 import java.io.File;
 import java.lang.management.ManagementFactory;

spring-boot-project/spring-boot-tools/spring-boot-gradle-plugin/src/test/java/com/example/bootrun/jvmargs/BootRunJvmArgsApplication.java

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package com.example.jvmargs;
+package com.example.bootrun.jvmargs;
 
 import java.lang.management.ManagementFactory;
 

spring-boot-project/spring-boot-tools/spring-boot-gradle-plugin/src/test/java/org/springframework/boot/gradle/tasks/bundling/BootJarIntegrationTests.java

@@ -44,6 +44,7 @@ import org.gradle.testkit.runner.UnexpectedBuildFailure;
 import org.junit.jupiter.api.TestTemplate;
 
 import org.springframework.boot.loader.tools.JarModeLibrary;
+import org.springframework.util.FileSystemUtils;
 import org.springframework.util.StringUtils;
 
 import static org.assertj.core.api.Assertions.assertThat;
@@ -240,6 +241,28 @@ class BootJarIntegrationTests extends AbstractBootArchiveIntegrationTests {
 		assertExtractedLayers(layerNames, indexedLayers);
 	}
 
+	@TestTemplate
+	void packagedApplicationClasspath() throws IOException {
+		copyClasspathApplication();
+		BuildResult result = this.gradleBuild.build("launch");
+		String output = result.getOutput();
+		assertThat(output).containsPattern("1\\. .*classes");
+		assertThat(output).containsPattern("2\\. .*library-1.0-SNAPSHOT.jar");
+		assertThat(output).containsPattern("3\\. .*commons-lang3-3.9.jar");
+		assertThat(output).doesNotContain("4. ");
+	}
+
+	@TestTemplate
+	void explodedApplicationClasspath() throws IOException {
+		copyClasspathApplication();
+		BuildResult result = this.gradleBuild.build("launch");
+		String output = result.getOutput();
+		assertThat(output).containsPattern("1\\. .*classes");
+		assertThat(output).containsPattern("2\\. .*library-1.0-SNAPSHOT.jar");
+		assertThat(output).containsPattern("3\\. .*commons-lang3-3.9.jar");
+		assertThat(output).doesNotContain("4. ");
+	}
+
 	private void assertExtractedLayers(List<String> layerNames, Map<String, List<String>> indexedLayers)
 			throws IOException {
 		Map<String, List<String>> extractedLayers = readExtractedLayers(this.gradleBuild.getProjectDir(), layerNames);
@@ -339,4 +362,14 @@ class BootJarIntegrationTests extends AbstractBootArchiveIntegrationTests {
 		return extractedLayers;
 	}
 
+	private void copyClasspathApplication() throws IOException {
+		copyApplication("classpath");
+	}
+
+	private void copyApplication(String name) throws IOException {
+		File output = new File(this.gradleBuild.getProjectDir(), "src/main/java/com/example/bootjar/" + name);
+		output.mkdirs();
+		FileSystemUtils.copyRecursively(new File("src/test/java/com/example/bootjar/" + name), output);
+	}
+
 }

spring-boot-project/spring-boot-tools/spring-boot-gradle-plugin/src/test/java/org/springframework/boot/gradle/tasks/bundling/BootJarTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2020 the original author or authors.
+ * Copyright 2012-2021 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.
@@ -200,9 +200,10 @@ class BootJarTests extends AbstractBootArchiveTests<TestBootJar> {
 	@Test
 	void whenJarIsLayeredClasspathIndexPointsToLayeredLibs() throws IOException {
 		try (JarFile jarFile = new JarFile(createLayeredJar())) {
-			assertThat(entryLines(jarFile, "BOOT-INF/classpath.idx")).containsExactly("- \"first-library.jar\"",
-					"- \"second-library.jar\"", "- \"third-library-SNAPSHOT.jar\"", "- \"first-project-library.jar\"",
-					"- \"second-project-library-SNAPSHOT.jar\"");
+			assertThat(entryLines(jarFile, "BOOT-INF/classpath.idx")).containsExactly(
+					"- \"BOOT-INF/lib/first-library.jar\"", "- \"BOOT-INF/lib/second-library.jar\"",
+					"- \"BOOT-INF/lib/third-library-SNAPSHOT.jar\"", "- \"BOOT-INF/lib/first-project-library.jar\"",
+					"- \"BOOT-INF/lib/second-project-library-SNAPSHOT.jar\"");
 		}
 	}
 
@@ -224,9 +225,10 @@ class BootJarTests extends AbstractBootArchiveTests<TestBootJar> {
 		try (JarFile jarFile = new JarFile(createPopulatedJar())) {
 			assertThat(jarFile.getManifest().getMainAttributes().getValue("Spring-Boot-Classpath-Index"))
 					.isEqualTo("BOOT-INF/classpath.idx");
-			assertThat(entryLines(jarFile, "BOOT-INF/classpath.idx")).containsExactly("- \"first-library.jar\"",
-					"- \"second-library.jar\"", "- \"third-library-SNAPSHOT.jar\"", "- \"first-project-library.jar\"",
-					"- \"second-project-library-SNAPSHOT.jar\"");
+			assertThat(entryLines(jarFile, "BOOT-INF/classpath.idx")).containsExactly(
+					"- \"BOOT-INF/lib/first-library.jar\"", "- \"BOOT-INF/lib/second-library.jar\"",
+					"- \"BOOT-INF/lib/third-library-SNAPSHOT.jar\"", "- \"BOOT-INF/lib/first-project-library.jar\"",
+					"- \"BOOT-INF/lib/second-project-library-SNAPSHOT.jar\"");
 		}
 	}
 

spring-boot-project/spring-boot-tools/spring-boot-gradle-plugin/src/test/java/org/springframework/boot/gradle/tasks/run/BootRunIntegrationTests.java

@@ -81,7 +81,8 @@ class BootRunIntegrationTests {
 		copyClasspathApplication();
 		BuildResult result = this.gradleBuild.build("echoMainClassName");
 		assertThat(result.task(":echoMainClassName").getOutcome()).isEqualTo(TaskOutcome.SUCCESS);
-		assertThat(result.getOutput()).contains("Main class name = com.example.classpath.BootRunClasspathApplication");
+		assertThat(result.getOutput())
+				.contains("Main class name = com.example.bootrun.classpath.BootRunClasspathApplication");
 	}
 
 	@TestTemplate
@@ -129,9 +130,9 @@ class BootRunIntegrationTests {
 	}
 
 	private void copyApplication(String name) throws IOException {
-		File output = new File(this.gradleBuild.getProjectDir(), "src/main/java/com/example/" + name);
+		File output = new File(this.gradleBuild.getProjectDir(), "src/main/java/com/example/bootrun/" + name);
 		output.mkdirs();
-		FileSystemUtils.copyRecursively(new File("src/test/java/com/example/" + name), output);
+		FileSystemUtils.copyRecursively(new File("src/test/java/com/example/bootrun/" + name), output);
 	}
 
 	private String canonicalPathOf(String path) throws IOException {

spring-boot-project/spring-boot-tools/spring-boot-gradle-plugin/src/test/resources/org/springframework/boot/gradle/tasks/bundling/BootJarIntegrationTests-explodedApplicationClasspath.gradle

@@ -0,0 +1,25 @@
+plugins {
+	id 'java'
+	id 'org.springframework.boot' version '{version}'
+}
+
+repositories {
+	mavenCentral()
+	maven { url "file:repository" }
+}
+
+dependencies {
+	implementation("com.example:library:1.0-SNAPSHOT")
+	implementation("org.apache.commons:commons-lang3:3.9")
+}
+
+task explode(type: Sync) {
+	dependsOn(bootJar)
+	destinationDir = file("$buildDir/exploded")
+	from zipTree(files(bootJar).singleFile)
+}
+
+task launch(type: JavaExec) {
+	classpath = files(explode)
+	main = 'org.springframework.boot.loader.JarLauncher'
+}

spring-boot-project/spring-boot-tools/spring-boot-gradle-plugin/src/test/resources/org/springframework/boot/gradle/tasks/bundling/BootJarIntegrationTests-packagedApplicationClasspath.gradle

@@ -0,0 +1,19 @@
+
+plugins {
+	id 'java'
+	id 'org.springframework.boot' version '{version}'
+}
+
+task launch(type: JavaExec) {
+	classpath = files(bootJar)
+}
+
+repositories {
+	mavenCentral()
+	maven { url "file:repository" }
+}
+
+dependencies {
+	implementation("com.example:library:1.0-SNAPSHOT")
+	implementation("org.apache.commons:commons-lang3:3.9")
+}

spring-boot-project/spring-boot-tools/spring-boot-loader-tools/src/main/java/org/springframework/boot/loader/tools/Packager.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2020 the original author or authors.
+ * Copyright 2012-2021 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.
@@ -473,15 +473,11 @@ public abstract class Packager {
 		}
 
 		private void writeClasspathIndex(RepackagingLayout layout, AbstractJarWriter writer) throws IOException {
-			List<String> names = this.libraries.keySet().stream().map(this::getJarName)
-					.map((name) -> "- \"" + name + "\"").collect(Collectors.toList());
+			List<String> names = this.libraries.keySet().stream().map((path) -> "- \"" + path + "\"")
+					.collect(Collectors.toList());
 			writer.writeIndexFile(layout.getClasspathIndexFileLocation(), names);
 		}
 
-		private String getJarName(String path) {
-			return path.substring(path.lastIndexOf('/') + 1);
-		}
-
 	}
 
 }

spring-boot-project/spring-boot-tools/spring-boot-loader-tools/src/test/java/org/springframework/boot/loader/tools/AbstractPackagerTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2020 the original author or authors.
+ * Copyright 2012-2021 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.
@@ -234,7 +234,7 @@ abstract class AbstractPackagerTests<P extends Packager> {
 		String index = getPackagedEntryContent("BOOT-INF/classpath.idx");
 		String[] libraries = index.split("\\r?\\n");
 		List<String> expected = Stream.of(libJarFile1, libJarFile2, libJarFile3)
-				.map((jar) -> "- \"" + jar.getName() + "\"").collect(Collectors.toList());
+				.map((jar) -> "- \"BOOT-INF/lib/" + jar.getName() + "\"").collect(Collectors.toList());
 		assertThat(Arrays.asList(libraries)).containsExactlyElementsOf(expected);
 	}
 
@@ -265,7 +265,7 @@ abstract class AbstractPackagerTests<P extends Packager> {
 		assertThat(hasPackagedEntry("BOOT-INF/classpath.idx")).isTrue();
 		String classpathIndex = getPackagedEntryContent("BOOT-INF/classpath.idx");
 		List<String> expectedClasspathIndex = Stream.of(libJarFile1, libJarFile2, libJarFile3)
-				.map((file) -> "- \"" + file.getName() + "\"").collect(Collectors.toList());
+				.map((file) -> "- \"BOOT-INF/lib/" + file.getName() + "\"").collect(Collectors.toList());
 		assertThat(Arrays.asList(classpathIndex.split("\\n"))).containsExactlyElementsOf(expectedClasspathIndex);
 		assertThat(hasPackagedEntry("BOOT-INF/layers.idx")).isTrue();
 		String layersIndex = getPackagedEntryContent("BOOT-INF/layers.idx");
@@ -296,7 +296,7 @@ abstract class AbstractPackagerTests<P extends Packager> {
 		assertThat(hasPackagedEntry("BOOT-INF/classpath.idx")).isTrue();
 		String classpathIndex = getPackagedEntryContent("BOOT-INF/classpath.idx");
 		assertThat(Arrays.asList(classpathIndex.split("\\n")))
-				.containsExactly("- \"spring-boot-jarmode-layertools.jar\"");
+				.containsExactly("- \"BOOT-INF/lib/spring-boot-jarmode-layertools.jar\"");
 		assertThat(hasPackagedEntry("BOOT-INF/layers.idx")).isTrue();
 		String layersIndex = getPackagedEntryContent("BOOT-INF/layers.idx");
 		List<String> expectedLayers = new ArrayList<>();

spring-boot-project/spring-boot-tools/spring-boot-loader/src/test/java/org/springframework/boot/loader/ClassPathIndexFileTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2020 the original author or authors.
+ * Copyright 2012-2021 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.
@@ -78,11 +78,11 @@ class ClassPathIndexFileTests {
 		ClassPathIndexFile indexFile = copyAndLoadTestIndexFile();
 		List<URL> urls = indexFile.getUrls();
 		List<File> expected = new ArrayList<>();
-		expected.add(new File(this.temp, "a.jar"));
-		expected.add(new File(this.temp, "b.jar"));
-		expected.add(new File(this.temp, "c.jar"));
-		expected.add(new File(this.temp, "d.jar"));
-		expected.add(new File(this.temp, "e.jar"));
+		expected.add(new File(this.temp, "BOOT-INF/layers/one/lib/a.jar"));
+		expected.add(new File(this.temp, "BOOT-INF/layers/one/lib/b.jar"));
+		expected.add(new File(this.temp, "BOOT-INF/layers/one/lib/c.jar"));
+		expected.add(new File(this.temp, "BOOT-INF/layers/two/lib/d.jar"));
+		expected.add(new File(this.temp, "BOOT-INF/layers/two/lib/e.jar"));
 		assertThat(urls).containsExactly(expected.stream().map(this::toUrl).toArray(URL[]::new));
 	}
 

spring-boot-project/spring-boot-tools/spring-boot-loader/src/test/resources/org/springframework/boot/loader/classpath-index-file.idx

@@ -1,5 +1,5 @@
-- "a.jar"
-- "b.jar"
-- "c.jar"
-- "d.jar"
-- "e.jar"
+- "BOOT-INF/layers/one/lib/a.jar"
+- "BOOT-INF/layers/one/lib/b.jar"
+- "BOOT-INF/layers/one/lib/c.jar"
+- "BOOT-INF/layers/two/lib/d.jar"
+- "BOOT-INF/layers/two/lib/e.jar"