Hi, I am working with Restlet 2.1.2 on Linux (RHEL 6 on x86_64). java
-version reports:
java version "1.6.0_24"
OpenJDK Runtime Environment (IcedTea6 1.11.3) (rhel-1.48.1.11.3.el6_2-x86_64)
OpenJDK 64-Bit Server VM (build 20.0-b12, mixed mode)
I have a thread which executes a POST every few seconds. Every now and
then (happens irregularly, perhaps varying from a few minutes to an
hour) I get UnknownHostException for a while (varies, perhaps about a
minute) and then POST succeeds for some time after that. The
UnknownHostException is puzzling because the host name is always the
same, and if I try resolving the name another way (namely, using the
"host" program on the command line) then the host name is resolved.
I've appended a typical stack trace below. Thanks in advance for any
light you can shed on this question.
best
Robert Dodier
PS.
An error occurred during the communication with the remote HTTP server.
java.net.UnknownHostException: innovmdmtest.cloudapp.net
at java.net.Inet6AddressImpl.lookupAllHostAddr(Native Method)
at java.net.InetAddress$1.lookupAllHostAddr(InetAddress.java:867)
at java.net.InetAddress.getAddressFromNameService(InetAddress.java:1246)
at java.net.InetAddress.getAllByName0(InetAddress.java:1197)
at java.net.InetAddress.getAllByName(InetAddress.java:1128)
at java.net.InetAddress.getAllByName(InetAddress.java:1064)
at
org.apache.http.impl.conn.DefaultClientConnectionOperator.resolveHostname(DefaultClientConnectionOperator.java:242)
at
org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:130)
at
org.apache.http.impl.conn.AbstractPoolEntry.open(AbstractPoolEntry.java:149)
at
org.apache.http.impl.conn.AbstractPooledConnAdapter.open(AbstractPooledConnAdapter.java:121)
at
org.apache.http.impl.client.DefaultRequestDirector.tryConnect(DefaultRequestDirector.java:561)
at
org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:415)
at
org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:820)
at
org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:754)
at
org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:732)
at
org.restlet.ext.httpclient.internal.HttpMethodCall.sendRequest(HttpMethodCall.java:336)
at org.restlet.engine.adapter.ClientAdapter.commit(ClientAdapter.java:114)
at
org.restlet.engine.adapter.HttpClientHelper.handle(HttpClientHelper.java:112)
at org.restlet.Client.handle(Client.java:180)
at org.restlet.routing.Filter.doHandle(Filter.java:159)
at org.restlet.routing.Filter.handle(Filter.java:206)
at org.restlet.resource.ClientResource.handle(ClientResource.java:1136)
at
org.restlet.resource.ClientResource.handleOutbound(ClientResource.java:1225)
at org.restlet.resource.ClientResource.handle(ClientResource.java:1025)
at org.restlet.resource.ClientResource.post(ClientResource.java:1418)
at foo.bar.RelayToRestServer.postToRestServer(RelayToRestServer.java:183)
at foo.bar.RelayToRestServer.relay(RelayToRestServer.java:114)
at foo.bar.RelayToRestServer.recalculate(RelayToRestServer.java:101)
at foo.bar.MyTimerTask.run(MyTimerTask.java:126)
at java.util.TimerThread.mainLoop(Timer.java:534)
at java.util.TimerThread.run(Timer.java:484)
Communication Error (1001) - The connector failed to complete the
communication with the server
at org.restlet.resource.ClientResource.doError(ClientResource.java:612)
at
org.restlet.resource.ClientResource.handleInbound(ClientResource.java:1202)
at org.restlet.resource.ClientResource.handle(ClientResource.java:1026)
at org.restlet.resource.ClientResource.post(ClientResource.java:1418)
at foo.bar.RelayToRestServer.postToRestServer(RelayToRestServer.java:183)
at foo.bar.RelayToRestServer.relay(RelayToRestServer.java:114)
at foo.bar.RelayToRestServer.recalculate(RelayToRestServer.java:101)
at foo.bar.MyTimerTask.run(MyTimerTask.java:126)
at java.util.TimerThread.mainLoop(Timer.java:534)
at java.util.TimerThread.run(Timer.java:484)
Caused by: java.net.UnknownHostException: innovmdmtest.cloudapp.net
at java.net.Inet6AddressImpl.lookupAllHostAddr(Native Method)
at java.net.InetAddress$1.lookupAllHostAddr(InetAddress.java:867)
at java.net.InetAddress.getAddressFromNameService(InetAddress.java:1246)
at java.net.InetAddress.getAllByName0(InetAddress.java:1197)
at java.net.InetAddress.getAllByName(InetAddress.java:1128)
at java.net.InetAddress.getAllByName(InetAddress.java:1064)
at
org.apache.http.impl.conn.DefaultClientConnectionOperator.resolveHostname(DefaultClientConnectionOperator.java:242)
at
org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:130)
at
org.apache.http.impl.conn.AbstractPoolEntry.open(AbstractPoolEntry.java:149)
at
org.apache.http.impl.conn.AbstractPooledConnAdapter.open(AbstractPooledConnAdapter.java:121)
at
org.apache.http.impl.client.DefaultRequestDirector.tryConnect(DefaultRequestDirector.java:561)
at
org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:415)
at
org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:820)
at
org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:754)
at
org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:732)
at
org.restlet.ext.httpclient.internal.HttpMethodCall.sendRequest(HttpMethodCall.java:336)
at org.restlet.engine.adapter.ClientAdapter.commit(ClientAdapter.java:114)
at
org.restlet.engine.adapter.HttpClientHelper.handle(HttpClientHelper.java:112)
at org.restlet.Client.handle(Client.java:180)
at org.restlet.routing.Filter.doHandle(Filter.java:159)
at org.restlet.routing.Filter.handle(Filter.java:206)
at org.restlet.resource.ClientResource.handle(ClientResource.java:1136)
at
org.restlet.resource.ClientResource.handleOutbound(ClientResource.java:1225)
at org.restlet.resource.ClientResource.handle(ClientResource.java:1025)
... 7 more
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