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Posted to httpclient-users@hc.apache.org by Yongxing Wang <yo...@yahoo.com> on 2009/11/13 20:43:28 UTC

NullPointerException in AsyncNHttpClientHandler

Oleg,

I am using http nio/core (version 4.0.1) and I got some NullPointerException when the connection times out. 

[10002 /127.0.0.1:3556] 2009/11/13 11:29:58.665-0800 DEBUG;[nio.impl.HttpIoReactor:218] Unhandled RuntimeException: 
java.lang.NullPointerException
    at org.apache.http.nio.protocol.AsyncNHttpClientHandler.timeout(AsyncNHttpClientHandler.java:344)
    at org.apache.http.impl.nio.DefaultClientIOEventDispatch.timeout(DefaultClientIOEventDispatch.java:158)
    at org.apache.http.impl.nio.reactor.BaseIOReactor.timeoutCheck(BaseIOReactor.java:255)
    at org.apache.http.impl.nio.reactor.BaseIOReactor.validate(BaseIOReactor.java:203)
    at org.apache.http.impl.nio.reactor.AbstractIOReactor.execute(AbstractIOReactor.java:260)
    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)

Looking at the code, 

ClientConnState connState = (ClientConnState) context.getAttribute(CONN_STATE);

        try {

            if (connState.getOutputState() == ClientConnState.EXPECT_CONTINUE) {
             ......

      }catch(IOException e){
      }
      handleTimeout();


It could happen if the attribute get removed somehow before execution comes here.... It might be safer to check it being NULL or not....

Thanks,
Yong



      

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Re: NullPointerException in AsyncNHttpClientHandler

Posted by Oleg Kalnichevski <ol...@apache.org>.
Yongxing Wang wrote:
> Oleg,
> 
> I am using http nio/core (version 4.0.1) and I got some NullPointerException when the connection times out. 
> 
> [10002 /127.0.0.1:3556] 2009/11/13 11:29:58.665-0800 DEBUG;[nio.impl.HttpIoReactor:218] Unhandled RuntimeException: 
> java.lang.NullPointerException
>     at org.apache.http.nio.protocol.AsyncNHttpClientHandler.timeout(AsyncNHttpClientHandler.java:344)
>     at org.apache.http.impl.nio.DefaultClientIOEventDispatch.timeout(DefaultClientIOEventDispatch.java:158)
>     at org.apache.http.impl.nio.reactor.BaseIOReactor.timeoutCheck(BaseIOReactor.java:255)
>     at org.apache.http.impl.nio.reactor.BaseIOReactor.validate(BaseIOReactor.java:203)
>     at org.apache.http.impl.nio.reactor.AbstractIOReactor.execute(AbstractIOReactor.java:260)
>     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)
> 
> Looking at the code, 
> 
> ClientConnState connState = (ClientConnState) context.getAttribute(CONN_STATE);
> 
>         try {
> 
>             if (connState.getOutputState() == ClientConnState.EXPECT_CONTINUE) {
>              ......
> 
>       }catch(IOException e){
>       }
>       handleTimeout();
> 
> 
> It could happen if the attribute get removed somehow before execution comes here.... It might be safer to check it being NULL or not....
> 
> Thanks,
> Yong
> 
> 

Hi Yong

I will add a check for the attribute being non null, I just cannot see 
how it can happen.

Anyway, many thanks for reporting the problem.

Oleg


> 
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