Hi,
We are using HTTP-NIO 4.0 to communicate with our internal http servers, on a
very high volume bases (80Mbits/second on both upload and download). We use
AsyncNHttpClientHandler and DefaultClientIOEventDispatch.
We are seeing some strange behaviors randomly. After putting some debug
messages and we finally identify the following exception that causes us great
sorrow:
java.lang.NullPointerException
at
org.apache.http.nio.protocol.AsyncNHttpClientHandler.outputReady(AsyncNHttpClientHandler.java:266)
at
org.apache.http.impl.nio.DefaultNHttpClientConnection.produceOutput(DefaultNHttpClientConnection.java:213)
at
org.apache.http.impl.nio.DefaultClientIOEventDispatch.outputReady(DefaultClientIOEventDispatch.java:152)
at
org.apache.http.impl.nio.reactor.BaseIOReactor.writable(BaseIOReactor.java:177)
at
org.apache.http.impl.nio.reactor.AbstractIOReactor.processEvent(AbstractIOReactor.java:317)
at
org.apache.http.impl.nio.reactor.AbstractIOReactor.processEvents(AbstractIOReactor.java:294)
at
org.apache.http.impl.nio.reactor.AbstractIOReactor.execute(AbstractIOReactor.java:256)
at
org.apache.http.impl.nio.reactor.BaseIOReactor.execute(BaseIOReactor.java:96)
at
org.apache.http.impl.nio.reactor.AbstractMultiworkerIOReactor$Worker.run(AbstractMultiworkerIOReactor.java:556)
at
java.lang.Thread.run(Thread.java:619)
It happens randomly and happens with HTTP GET. Look at the line 266, it is:
int statusCode = response.getStatusLine().getStatusCode();
It seems that the "response" is returned prematurely.
This NullPointerException will propagate all the way up to
IOReactorExceptionHandler "handle(RuntimeException ex);", where you only have
two options, ignore it or shutdown the whole IoReactor (neither of the two is
good for us). I guess the root problem is that we should never see that NPE.
Is there any more information I can provide to help address this problem?
thanks,
Yong
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