We are using HttpClient (3.x) on an application server to call a web
service. This code has been deployed for over a year. Yesterday,
after the application server had been running for 12 days, we started
getting connection time out errors. Restarting the application server
fixed the issue.
My question is, what if anything, is potentially cached at the
application level (apparently the Http Client level its dependencies)
that could cause the host to stop resolving. For example, if the DNS
changed for the server, is the DNS lookup cached at the VM level.
Alternatively, is the connection reused?
java.net.ConnectException: Connection timed out
at java.net.PlainSocketImpl.socketConnect(Native Method)
at java.net.PlainSocketImpl.doConnect(PlainSocketImpl.java:305)
at java.net.PlainSocketImpl.connectToAddress(PlainSocketImpl.java:171)
at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:158)
at java.net.Socket.connect(Socket.java:452)
at java.net.Socket.connect(Socket.java:402)
at sun.net.NetworkClient.doConnect(NetworkClient.java:139)
at sun.net.www.http.HttpClient.openServer(HttpClient.java:402)
at sun.net.www.http.HttpClient.openServer(HttpClient.java:618)
at sun.net.www.http.HttpClient.<init>(HttpClient.java:306)
at sun.net.www.http.HttpClient.<init>(HttpClient.java:267)
at sun.net.www.http.HttpClient.New(HttpClient.java:339)
at sun.net.www.http.HttpClient.New(HttpClient.java:320)
at sun.net.www.http.HttpClient.New(HttpClient.java:315)
at
sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:521)
at
sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:498)
at
sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:626)
at
java.net.HttpURLConnection.getResponseCode(HttpURLConnection.java:272)
Thanks
Jonathan
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