diff --git a/test/jdk/java/nio/channels/Selector/FailedConnect.java b/test/jdk/java/nio/channels/Selector/FailedConnect.java new file mode 100644 index 00000000000..cbe7f2d451f --- /dev/null +++ b/test/jdk/java/nio/channels/Selector/FailedConnect.java @@ -0,0 +1,121 @@ +/* + * Copyright (c) 2026, 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. + */ + +import java.io.IOException; +import java.net.ConnectException; +import java.net.InetAddress; +import java.net.InetSocketAddress; +import java.nio.channels.SelectionKey; +import java.nio.channels.Selector; +import java.nio.channels.SocketChannel; +import java.time.Duration; +import java.util.concurrent.atomic.AtomicBoolean; + +import org.junit.jupiter.api.Test; +import static org.junit.jupiter.api.Assertions.assertEquals; +import static org.junit.jupiter.api.Assertions.assertFalse; +import static org.junit.jupiter.api.Assertions.assertNotNull; +import static org.junit.jupiter.api.Assertions.assertThrows; +import static org.junit.jupiter.api.Assertions.assertTrue; + +/* + * @test + * @summary Verify that when a SocketChannel is registered with a Selector + * with an interest in CONNECT operation, then SocketChannel.finishConnect() + * throws the correct exception message, if the connect() fails + * @run junit ${test.main.class} + */ +class FailedConnect { + + /* + * On a non-blocking SocketChannel, registered with a Selector, this test method + * attempts a SocketChannel.connect() against an address that is expected to return + * Connection refused. The test then calls SocketChannel.finishConnect() when the + * Selector makes available the ready key for this connect operation and expects + * that finishConnect() throws a ConnectException with the expected exception message. + */ + @Test + void testFinishConnect() throws Exception { + // find a suitable address against which the connect() attempt + // will result in a Connection refused exception + final InetSocketAddress destAddr = findSuitableRefusedAddress(); + // we don't want to skip the test, because we expect at least one port + // which would result in a connection refused + assertNotNull(destAddr, "couldn't find a suitable port which will generate" + + " a connection refused error"); + try (Selector selector = Selector.open(); + SocketChannel sc = SocketChannel.open()) { + + // non-blocking + sc.configureBlocking(false); + sc.register(selector, SelectionKey.OP_CONNECT); + + System.err.println("establishing connection to " + destAddr); + boolean connected = sc.connect(destAddr); + assertFalse(connected, "unexpectedly connected to " + destAddr); + // wait for ready ops + int numReady = selector.select(Duration.ofMinutes(10).toMillis()); + System.err.println("Num ready keys = " + numReady); + for (SelectionKey readyKey : selector.selectedKeys()) { + System.err.println("ready key: " + readyKey); + assertTrue(readyKey.isConnectable(), "unexpected key, readyOps = " + + readyKey.readyOps()); + readyKey.cancel(); + + AtomicBoolean success = new AtomicBoolean(); + // expect SocketChannel.finishConnect() to throw a ConnectException + ConnectException ce = assertThrows(ConnectException.class, () -> { + success.set(sc.finishConnect()); + }, "finishConnect() was expected to fail but didn't, connected = " + + success.get()); + System.err.println("got expected exception - " + ce); + // verify exception message + assertEquals("Connection refused", ce.getMessage()); + } + } + } + + // Try to find a suitable port to provoke a "Connection Refused" error. + private static InetSocketAddress findSuitableRefusedAddress() throws IOException { + final InetAddress loopbackAddr = InetAddress.getLoopbackAddress(); + // port 47 is reserved - there should be nothing listening on it + InetSocketAddress destAddr = new InetSocketAddress(loopbackAddr, 47); + try (SocketChannel sc1 = SocketChannel.open(destAddr)) { + // If we manage to connect, let's try to use some other + // port. + // port 51 is reserved too - there should be nothing there. + destAddr = new InetSocketAddress(loopbackAddr, 51); + try (SocketChannel sc2 = SocketChannel.open(destAddr)) { + } + // OK, last attempt... + // port 61 is reserved too - there should be nothing there. + destAddr = new InetSocketAddress(loopbackAddr, 61); + try (SocketChannel sc3 = SocketChannel.open(destAddr)) { + } + return null; + } catch (ConnectException x) { + } + // the address which will generate a connection refused, when a connection is attempted + return destAddr; + } +}