Re: Error unmarshaling return header

Hi Peter, thanks for the help. Hmmmm...we set our timeout in the client
(and server) socket factory to 0. If I understand this setting, then it
should wait forever and we should never see these read timeouts.



-----Original Message-----
From: Peter Jones - JavaSoft East [mailto:[email protected]] 
Sent: Tuesday, December 07, 2004 5:26 PM
To: Robert DiFalco
Cc: [email protected]
Subject: Re: Error unmarshaling return header

> On a heavily loaded system I occasionally get these?
> 
> Anyone seen them? What's odd is that the read timeout is set to days.

> Is this something else that is timing out? An ack rather than a read?

> Is there a sun rmi timeout property that I should be increasing?

The exception appears to indicate that a socket read timeout set by
invoking setSoTimeout on the underlying socket, presumably by a client
socket factory, has expired while waiting for the response to a remote
invocation request.  Do you indeed have a socket factory that sets such
a read timeout (is that the read timeout you refer to above, set to
days)?  What is the exact value?

It appears that you are using 1.4.2?  The client-side RMI implementation
sets its own read timeout on the socket during the initial handshake
phase of the connection; the value is controlled by the system property
"sun.rmi.transport.tcp.handshakeTimeout" (default one minute), as
described here:

	
http://java.sun.com/j2se/1.4.2/docs/guide/rmi/sunrmiproperties.html

but a timeout during that handshake would cause a different exception,
and after the handshake has completed, the socket's original read
timeout is restored (or if it had been zero, the value of the system
property "sun.rmi.transport.tcp.responseTimeout" is used instead).

> Does SSL play a part here?

Perhaps, although I'm sure how.  There is a known JSSE bug that read
timeouts which occur in the middle of reading an SSL record are not
recoverable (subsequent read throws an SSLException), but that does not
appear to be related to what is happening here.  Enabling JSSE's SSL
debug tracing might provide a clue, such as tracing invocations of
setSoTimeout on SSL sockets:

http://java.sun.com/j2se/1.4.2/docs/guide/security/jsse/JSSERefGuide.htm
l#Debug

> java.rmi.UnmarshalException: Error unmarshaling return header; nested
exception is:
>         java.net.SocketTimeoutException: Read timed out
>         at
sun.rmi.transport.StreamRemoteCall.executeCall(StreamRemoteCall.java:203
)
>         at sun.rmi.server.UnicastRef.invoke(UnicastRef.java:133)
>         at
com.me.services.ElementManagerService_Stub.addVersions(Unknown Source)
>         at
com.me.RuleRunner$3.run(ElementSpecifierRuleRunner.java:1137)
>         at
EDU.oswego.cs.dl.util.concurrent.PooledExecutor$Worker.run(Unknown
Source)
>         at java.lang.Thread.run(Thread.java:534)
> Caused by: java.net.SocketTimeoutException: Read timed out
>         at java.net.SocketInputStream.socketRead0(Native Method)
>         at java.net.SocketInputStream.read(SocketInputStream.java:129)
>         at com.sun.net.ssl.internal.ssl.InputRecord.a(DashoA12275)
>         at com.sun.net.ssl.internal.ssl.InputRecord.read(DashoA12275)
>         at com.sun.net.ssl.internal.ssl.SSLSocketImpl.a(DashoA12275)
>         at com.sun.net.ssl.internal.ssl.SSLSocketImpl.a(DashoA12275)
>         at
com.sun.net.ssl.internal.ssl.AppInputStream.read(DashoA12275)
>         at
java.io.BufferedInputStream.fill(BufferedInputStream.java:183)
>         at
java.io.BufferedInputStream.read(BufferedInputStream.java:201)
>         at java.io.DataInputStream.readByte(DataInputStream.java:331)
>         at 
> sun.rmi.transport.StreamRemoteCall.executeCall(StreamRemoteCall.java:1
> 89)

-- Peter

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