Internal Server Error (500)

/* * Copyright (c) 2025, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. */ /* @test * @summary Test of a lazy map application * @enablePreview * @run junit DemoMapTest */ import org.junit.jupiter.api.*; import java.io.IOException; import java.nio.file.Files; import java.nio.file.Path; import java.util.Map; import java.util.Set; import static org.junit.jupiter.api.Assertions.*; final class DemoMapTest { static class OrderController{} // NEW: static final Map ORDERS = Map.ofLazy( Set.of("Customers", "Internal", "Testing"), _ -> new OrderController() ); public static OrderController orders() { String groupName = Thread.currentThread().getThreadGroup().getName(); return ORDERS.get(groupName); } @Test void orderController() throws InterruptedException { Thread t = Thread.ofPlatform() .group(new ThreadGroup("Customers")) .start(() -> { String groupName = Thread.currentThread().getThreadGroup().getName(); OrderController orderController = ORDERS.get(groupName); assertNotNull(orderController); }); t.join(); } private static final Map SERVER_ERROR_PAGES = Map.ofLazy( Set.of(500, 501, 502, 503, 504, 505, 506, 507, 508, 510, 511), e -> { try { return Files.readString(Path.of("server_error_" + e + ".html")); } catch (IOException ioe) { throw new RuntimeException(ioe); } }); private static String htmlServerErrorPage(int errorCode) { return SERVER_ERROR_PAGES.get(errorCode); // Eligible for constant folding } @Test void page500() { String page = htmlServerErrorPage(500); // Constant folds assertEquals(DEFAULT_FS_MSG, page); } static final String DEFAULT_FS_MSG = """ Internal Server Error (500) There was a general problem with the server, code 500 """; @BeforeAll public static void setup() throws IOException { var file = Path.of("server_error_500.html"); if (Files.notExists(file)) { Files.createFile(file); Files.writeString(file, DEFAULT_FS_MSG); } assertEquals(DEFAULT_FS_MSG, Files.readString(file)); } @AfterAll public static void cleanUp() throws IOException { var file = Path.of("server_error_500.html"); Files.deleteIfExists(file); } }