diff --git a/runtime/native/java_lang_VMClassLoader.cc b/runtime/native/java_lang_VMClassLoader.cc
index 1515630..0c39f2b 100644
--- a/runtime/native/java_lang_VMClassLoader.cc
+++ b/runtime/native/java_lang_VMClassLoader.cc
@@ -55,29 +55,60 @@
   return nullptr;
 }
 
+static jint VMClassLoader_getBootClassPathSize(JNIEnv*, jclass) {
+  return Runtime::Current()->GetClassLinker()->GetBootClassPath().size();
+}
+
 /*
- * Returns an array of entries from the boot classpath that could contain resources.
+ * Returns a string URL for a resource with the specified 'javaName' in
+ * entry 'index' of the boot class path.
+ *
+ * We return a newly-allocated String in the following form:
+ *
+ *   jar:file://path!/name
+ *
+ * Where "path" is the bootstrap class path entry and "name" is the string
+ * passed into this method.  "path" needs to be an absolute path (starting
+ * with '/'); if it's not we'd need to make it absolute as part of forming
+ * the URL string.
  */
-static jobjectArray VMClassLoader_getBootClassPathEntries(JNIEnv* env, jclass) {
+static jstring VMClassLoader_getBootClassPathResource(JNIEnv* env, jclass, jstring javaName,
+                                                      jint index) {
+  ScopedUtfChars name(env, javaName);
+  if (name.c_str() == nullptr) {
+    return nullptr;
+  }
+
   const std::vector<const DexFile*>& path =
       Runtime::Current()->GetClassLinker()->GetBootClassPath();
-  jclass stringClass = env->FindClass("java/lang/String");
-  jobjectArray array = env->NewObjectArray(path.size(), stringClass, nullptr);
-  for (size_t i = 0; i < path.size(); ++i) {
-    const DexFile* dex_file = path[i];
-
-    // For multidex locations, e.g., x.jar:classes2.dex, we want to look into x.jar.
-    const std::string& location(dex_file->GetBaseLocation());
-
-    jstring javaPath = env->NewStringUTF(location.c_str());
-    env->SetObjectArrayElement(array, i, javaPath);
+  if (index < 0 || size_t(index) >= path.size()) {
+    return nullptr;
   }
-  return array;
+  const DexFile* dex_file = path[index];
+
+  // For multidex locations, e.g., x.jar:classes2.dex, we want to look into x.jar.
+  const std::string& location(dex_file->GetBaseLocation());
+
+  std::string error_msg;
+  std::unique_ptr<ZipArchive> zip_archive(ZipArchive::Open(location.c_str(), &error_msg));
+  if (zip_archive.get() == nullptr) {
+    LOG(WARNING) << "Failed to open zip archive '" << location << "': " << error_msg;
+    return nullptr;
+  }
+  std::unique_ptr<ZipEntry> zip_entry(zip_archive->Find(name.c_str(), &error_msg));
+  if (zip_entry.get() == nullptr) {
+    return nullptr;
+  }
+
+  std::string url;
+  StringAppendF(&url, "jar:file://%s!/%s", location.c_str(), name.c_str());
+  return env->NewStringUTF(url.c_str());
 }
 
 static JNINativeMethod gMethods[] = {
   NATIVE_METHOD(VMClassLoader, findLoadedClass, "!(Ljava/lang/ClassLoader;Ljava/lang/String;)Ljava/lang/Class;"),
-  NATIVE_METHOD(VMClassLoader, getBootClassPathEntries, "()[Ljava/lang/String;"),
+  NATIVE_METHOD(VMClassLoader, getBootClassPathResource, "(Ljava/lang/String;I)Ljava/lang/String;"),
+  NATIVE_METHOD(VMClassLoader, getBootClassPathSize, "!()I"),
 };
 
 void register_java_lang_VMClassLoader(JNIEnv* env) {