David Spectar wrote:
Greetings fello Http Client Users,
I was trying out HttpClient 4.0 and noticed that I could easily get the code to
deadlock when my internet coverage would go down. It didn't happen every time
it went down, but if I had WIFI on that went down every couple of minutes and
say I was trying to continuously make HTTP GET requests, eventually the code
would deadlock.
I'd love to hear your thoughts on this. See below for stack trace and code.
Thanks for looking.
David
Here is the stack trace.
java.et.SocketInputStream.socketRead0(Native Method) // Code stays stuck here
forever.
Hi David
This problem has nothing to do with HttpClient. As you can see the
thread is blocked in a native method call. Use a socket timeout to make
sure I/O operations do not get stuck indefinitely.
Oleg
java.net.SocketInputStream.read(Unknown Source)
org.apache.http.impl.io.AbstractSessionInputBuffer.fillBuffer(AbstractSessionInputBuffer.java:130)
org.apache.http.impl.io.SocketInputBuffer.fillBuffer(SocketInputBuffer.java:127)
org.apache.http.impl.io.AbstractSessionInputBuffer.readLine(AbstractSessionInputBuffer.java:233)
org.apache.http.impl.conn.DefaultResponseParser.parseHead(DefaultResponseParser.java:82)
org.apache.http.impl.io.AbstractMessageParser.parse(AbstractMessageParser.java:210)
org.apache.http.impl.AbstractHttpClientConnection.receiveResponseHeader(AbstractHttpClientConnection.java:271)
org.apache.http.impl.conn.DefaultClientConnection.receiveResponseHeader(DefaultClientConnection.java:235)
org.apache.http.impl.conn.AbstractClientConnAdapter.receiveResponseHeader(AbstractClientConnAdapter.java:259)
org.apache.http.protocol.HttpRequestExecutor.doReceiveResponse(HttpRequestExecutor.java:292)
org.apache.http.protocol.HttpRequestExecutor.execute(HttpRequestExecutor.java:126)
org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:410)
org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:555)
org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:487)
MyCode.foo(MyCode.java:33)
Here is a simplified version of my code (taken from the Multi Threading example
code, but it did the same in the non-threading version)
HttpParams params = new BasicHttpParams();
ConnManagerParams.setMaxTotalConnections(params, 100);
HttpProtocolParams.setVersion(params, HttpVersion.HTTP_1_1);
SchemeRegistry schemeRegistry = new SchemeRegistry();
schemeRegistry.register(new Scheme("http",
PlainSocketFactory.getSocketFactory(), 80));
ClientConnectionManager cm = new ThreadSafeClientConnManager(params,
schemeRegistry);
DefaultHttpClient defHttpClient = new DefaultHttpClient(cm, params);
defHttpClient.setHttpRequestRetryHandler(new
DefaultHttpRequestRetryHandler(MaxRetries, true));
HttpGet httpGet = new HttpGet("http://www.google.com";);
HttpContext context = new BasicHttpContext();
HttpResponse response = HttpClient.execute(httpGet, context); // This method
never returns
// more code below that is never executed.
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