RunnerClassLoader - Return URL with an ending / if resource ending with /

independent-projects/bootstrap/runner/pom.xml

@@ -69,6 +69,11 @@
             <type>pom</type>
             <scope>test</scope>
         </dependency>
+        <dependency>
+            <groupId>org.assertj</groupId>
+            <artifactId>assertj-core</artifactId>
+            <scope>test</scope>
+        </dependency>
 
         <dependency>
             <groupId>io.quarkus</groupId>

independent-projects/bootstrap/runner/src/main/java/io/quarkus/bootstrap/runner/JarResource.java

@@ -93,18 +93,13 @@ private static class JarResourceURLProvider implements JarFileReference.JarFileC
         private static final JarResourceURLProvider INSTANCE = new JarResourceURLProvider();
 
         @Override
-        public URL apply(JarFile jarFile, Path path, String res) {
-            JarEntry entry = jarFile.getJarEntry(res);
+        public URL apply(JarFile jarFile, Path path, String resource) {
+            JarEntry entry = jarFile.getJarEntry(resource);
             if (entry == null) {
                 return null;
             }
             try {
-                String realName = JarEntries.getRealName(entry);
-                // Avoid ending the URL with / to avoid breaking compatibility
-                if (realName.endsWith("/")) {
-                    realName = realName.substring(0, realName.length() - 1);
-                }
-                final URL resUrl = getUrl(path, realName);
+                final URL resUrl = getUrl(path, getRealName(entry, resource));
                 // wrap it up into a "jar" protocol URL
                 //horrible hack to deal with '?' characters in the URL
                 //seems to be the only way, the URI constructor just does not let you handle them in a sane way
@@ -124,6 +119,25 @@ public URL apply(JarFile jarFile, Path path, String res) {
             }
         }
 
+        private static String getRealName(JarEntry entry, String resource) {
+            String realName = JarEntries.getRealName(entry);
+            // Make sure directories are returned with a / when the resource was requested with a /
+            if (resource.endsWith("/") && entry.isDirectory()) {
+                if (realName.endsWith("/")) {
+                    return realName;
+                } else {
+                    return realName + "/";
+                }
+            }
+
+            // this shouldn't be necessary but the previous implementation was doing it forcibly so keeping it for safety
+            if (realName.endsWith("/")) {
+                return realName.substring(0, realName.length() - 1);
+            }
+
+            return realName;
+        }
+
         private static URL getUrl(Path jarPath, String realName) throws MalformedURLException, URISyntaxException {
             final URI jarUri = jarPath.toUri();
             // first create a URI which includes both the jar file path and the relative resource name

independent-projects/bootstrap/runner/src/test/java/io/quarkus/bootstrap/runner/RunnerClassLoaderTest.java

@@ -1,5 +1,6 @@
 package io.quarkus.bootstrap.runner;
 
+import static org.assertj.core.api.Assertions.assertThat;
 import static org.junit.jupiter.api.Assertions.assertTrue;
 
 import java.nio.file.Path;
@@ -98,6 +99,27 @@ public void testConcurrentJarCloseAndReload() throws Exception {
         assertTrue(exceptionsInThreads.isEmpty(), "Exceptions in threads: " + exceptionsInThreads);
     }
 
+    @Test
+    public void testUrlWithTrailingSlash() {
+        ClassLoadingResource[] classLoadingResources = new ClassLoadingResource[] {
+                createProjectJarResource("simple-project-1.0.jar") };
+
+        Map<String, ClassLoadingResource[]> resourceDirectoryMap = Map.of(
+                "org", classLoadingResources,
+                "org/simple", classLoadingResources);
+
+        RunnerClassLoader runnerClassLoader = new RunnerClassLoader(ClassLoader.getSystemClassLoader(), resourceDirectoryMap,
+                Collections.emptySet(), Collections.emptySet(),
+                Collections.emptyList(), Collections.emptyMap());
+
+        assertThat(runnerClassLoader.findResource("org").toString()).endsWith("/org");
+        assertThat(runnerClassLoader.findResource("org/").toString()).endsWith("/org/");
+        assertThat(runnerClassLoader.findResource("org/simple").toString()).endsWith("/org/simple");
+        assertThat(runnerClassLoader.findResource("org/simple/").toString()).endsWith("/org/simple/");
+        assertThat(runnerClassLoader.findResource("org/simple/SimplePojo1.class").toString())
+                .endsWith("/org/simple/SimplePojo1.class");
+    }
+
     private static JarResource createProjectJarResource(String jarName) {
         ManifestInfo manifestInfo = new ManifestInfo(jarName.substring(jarName.lastIndexOf('-')), "1.0", "Apache", null, null,
                 null);