当服务器在调用粗麻布时出现问题（可能是套接字重置）时，释放客户端将永远挂起

Question

I have a client calls to a server through Hessian. During that time the server is not stable and ussually have Socket reset error. And the client was hangs at the below log. So how can I release this log but still keep the application running. And what is the reason that make the client hang forever? Thanks

at java.net.SocketInputStream.socketRead0(Native Method) at java.net.SocketInputStream.read(Unknown Source) at java.io.BufferedInputStream.fill(Unknown Source) at java.io.BufferedInputStream.read1(Unknown Source) at java.io.BufferedInputStream.read(Unknown Source) - locked <0x2159c988> (a java.io.BufferedInputStream) at sun.net.www.http.HttpClient.parseHTTPHeader(Unknown Source) at sun.net.www.http.HttpClient.parseHTTP(Unknown Source) at sun.net.www.http.HttpClient.parseHTTPHeader(Unknown Source) at sun.net.www.http.HttpClient.parseHTTP(Unknown Source) at sun.net.www.protocol.http.HttpURLConnection.getInputStream(Unknown Source)

Answer 1

By default HttpUrlConnection has no timeouts. You need to set java system properties for this:

http://docs.oracle.com/javase/7/docs/technotes/guides/net/properties.html

sun.net.client.defaultConnectTimeout (default: -1)
sun.net.client.defaultReadTimeout (default: -1)

Set it from command line:

-Dsun.net.client.defaultReadTimeout=30000 -Dsun.net.client.defaultConnectTimeout=30000

Or from Java code:

System.setProperty("sun.net.client.defaultReadTimeout", "30000");
System.setProperty("sun.net.client.defaultConnectTimeout", "30000");