Java example source code file (StackTraceTest.java)

This example Java source code file (StackTraceTest.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

connectexception, excepting, exception, expected, ioexception, net, network, runtimeexception, serversocket, stacktracetest, url, urlconnection

The StackTraceTest.java Java example source code

/*
 * Copyright (c) 2002, 2012, 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
 * @bug 4773417 5003746
 * @summary  HttpURLConnection.getInputStream() produces IOException with
 *           bad stack trace; HttpURLConnection.getInputStream loses
 *           exception message, exception class
 */
import java.net.*;
import java.io.IOException;

public class StackTraceTest {
    public static void main(String[] args) throws Exception {
        URL url;
        try (ServerSocket ss = new ServerSocket(0)) {  // refusing socket
            url = new URL("http://localhost:" + ss.getLocalPort() + "/");
        }
        URLConnection uc = url.openConnection();

        // Trigger implicit connection by trying to retrieve bogus
        // response header, and force remembered exception
        uc.getHeaderFieldKey(20);

        try {
            uc.getInputStream();  // expect to throw
            throw new RuntimeException("Expected getInputStream to throw");
        } catch (IOException ioe) {
            if (!(ioe instanceof ConnectException))
                throw new RuntimeException("Expect ConnectException, got " + ioe);
            if (ioe.getMessage() == null)
                throw new RuntimeException("Exception message is null");
            if (ioe.getCause() == null)
                throw new RuntimeException("Excepting a chained exception, but got: ",
                                           ioe);
        }
    }
}