/*
* Copyright ( c ) 2005 , 2019 , 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 6299712 7150552
* @ modules jdk . httpserver
* @ run main / othervm B6299712
* @ run main / othervm - Djava . net . preferIPv6Addresses = true B6299712
* @ summary NullPointerException in sun . net . www . protocol . http . HttpURLConnection . followRedirect
*/
import com.sun.net.httpserver.HttpExchange;
import com.sun.net.httpserver.HttpHandler;
import com.sun.net.httpserver.HttpServer;
import java.net.*;
import java.io.*;
import java.util.*;
/*
* Test Description :
* - main thread is run as a http client
* - another thread runs an http server , which redirects calls to " / " to
* " / redirect " and returns ' 200 OK ' for the successive call
* - a global ResponseCache instance is installed , which returns DeployCacheResponse
* for urls that end with " / redirect " , i . e . the url redirected to by our simple http server ,
* and null for other urls .
* - the whole result is that the first call will be served by our simple
* http server and is redirected to " / redirect " . The successive call will be done
* automatically by HttpURLConnection , which will be served by DeployCacheResponse .
* The NPE will be thrown on the second round if the bug is there .
*/
public class B6299712 {
static HttpServer server;
public static void main(String[] args) throws Exception {
ResponseCache.setDefault(new DeployCacheHandler());
ProxySelector.setDefault(ProxySelector.of(null )); // no proxy
startHttpServer();
makeHttpCall();
}
public static void startHttpServer() throws IOException {
InetAddress address = InetAddress.getLocalHost();
server = HttpServer.create(new InetSocketAddress(address, 0 ), 0 );
server.createContext("/" , new DefaultHandler());
server.createContext("/redirect" , new RedirectHandler());
server.start();
}
public static void makeHttpCall() throws IOException {
try {
System.out.println("http server listen on: "
+ server.getAddress().getPort());
URL url = new URL("http" ,
InetAddress.getLocalHost().getHostAddress(),
server.getAddress().getPort(), "/" );
HttpURLConnection uc = (HttpURLConnection)url.openConnection();
if (uc.getResponseCode() != 200 )
throw new RuntimeException("Expected Response Code was 200,"
+ "received: " + uc.getResponseCode());
uc.disconnect();
} finally {
server.stop(0 );
}
}
static class RedirectHandler implements HttpHandler {
@Override
public void handle(HttpExchange exchange) throws IOException {
exchange.sendResponseHeaders(200 , -1 );
exchange.close();
}
}
static class DefaultHandler implements HttpHandler {
@Override
public void handle(HttpExchange exchange) throws IOException {
exchange.getResponseHeaders().add("Location" , "/redirect" );
exchange.sendResponseHeaders(302 , -1 );
exchange.close();
}
}
static class DeployCacheHandler extends java.net.ResponseCache {
public synchronized CacheResponse get(final URI uri, String rqstMethod,
Map<String, List<String>> requestHeaders) throws IOException
{
System.out.println("get!!!: " + uri);
if (!uri.toString().endsWith("redirect" )) {
return null ;
}
System.out.println("Serving request from cache" );
return new DeployCacheResponse(new EmptyInputStream(),
new HashMap<String, List<String>>());
}
public synchronized CacheRequest put(URI uri, URLConnection conn)
throws IOException
{
URL url = uri.toURL();
return new DeployCacheRequest(url, conn);
}
}
static class DeployCacheRequest extends java.net.CacheRequest {
private URL _url;
private URLConnection _conn;
DeployCacheRequest(URL url, URLConnection conn) {
_url = url;
_conn = conn;
}
public void abort() {
}
public OutputStream getBody() throws IOException {
return null ;
}
}
static class DeployCacheResponse extends java.net.CacheResponse {
protected InputStream is;
protected Map<String, List<String>> headers;
DeployCacheResponse(InputStream is, Map<String, List<String>> headers) {
this .is = is;
this .headers = headers;
}
public InputStream getBody() throws IOException {
return is;
}
public Map<String, List<String>> getHeaders() throws IOException {
List<String> val = new ArrayList<>();
val.add("HTTP/1.1 200 OK" );
headers.put(null , val);
return headers;
}
}
static class EmptyInputStream extends InputStream {
public int read() throws IOException {
return -1 ;
}
}
}
Messung V0.5 in Prozent C=89 H=94 G=91
¤ Dauer der Verarbeitung: 0.12 Sekunden
(vorverarbeitet am 2026-06-10)
¤
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