RE: Java program waits 30 seconds in SELW status

Sorry, you are now deep in the JVM and iSeries sockets code which is out of
my league.  If you don't get other suggestions on the forum then calling
service is your next step.

David Wall
AS/400 Toolbox for Java




                      "Kendall
                      Coolidge"                To:       
<java400-l@midrange.com>
                      <kendall.coolidge        cc:
                      @ccbai.com>              Subject:  RE: Java program waits 
30 seconds in SELW status
                      Sent by:
                      java400-l-admin@m
                      idrange.com


                      02/14/2002 01:33
                      PM
                      Please respond to
                      java400-l





Thanks for your reply, David.  We have done some further investigation and
have found the following:  The customer AS/400 is actually more up to date
with PTF's than we are.  Is there a specific licensed program that I can
check for PTF level?

The job that hangs at SELW is the QJVACMDSRV job.  The first time data is
sent to the port, the program begins to execute immediately, processes the
data, and returns to wait on the port.  The second and subsequent times
data
is sent to the port we see the 30 second SELW status.  We examined the call
stack of  QJVACMDSRV while it was in SELW and found the following procedure
name at the end of the stack:
Java-net-InetAddress-getHostName()Ljava-lang-String;

Does this give you any clues?

Best regards,
Kendall Coolidge

-----Original Message-----
From:        java400-l-admin@midrange.com
[mailto:java400-l-admin@midrange.com] On
Behalf Of Dave Wall
Sent:        Wednesday, February 13, 2002 5:17 PM
To:          java400-l@midrange.com
Subject:           Re: Java program waits 30 seconds in SELW status


>From the developer who works on the command/program call server ...

   SELW is a Select Wait - our daemon jobs go into that all the time while
   sitting on a select(), waiting for a connection.  If the customer
   program is using a select() in order to check sockets for something to
   read or write, that would explain the SELW.  Then the question becomes
   why is it waiting for 30 seconds when the same program doesn't wait on a
   different system.  Are they up to date on PTFs, particularly for the
   sockets components?  Does the program use select()?  If so, I would look
   at the code around that area.

David Wall
AS/400 Toolbox for Java




                      "Kendall
                      Coolidge"                To:
<JAVA400-L@midrange.com>
                      <kendall.coolidge        cc:
                      @ccbai.com>              Subject:  Java program waits
30 seconds in SELW status
                      Sent by:
                      java400-l-admin@m
                      idrange.com


                      02/12/2002 05:20
                      PM
                      Please respond to
                      java400-l





Hello All,

We have an AS/400 Java program that binds to a TCP port and waits for data
to come through.  When running on our AS/400, when the data is received,
the
program immediately executes the next lines of code, processes the data,
and
returns to wait on that port.  However, on a customer's AS/400, the program
goes into a SELW status after it receives the data and waits there (using
no
CPU) for 30 seconds before processing the data successfully.

Can anyone suggest why the two machines would act so differently?  Both are
V4R5, using Toolbox 4.5 Mod 0.3, and JDK 1.1.8.  Our older model 40S does
not exhibit this behavior while the customer's 270 does.

Thanks in advance for any suggestions!

Kendall Coolidge


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