RE: Java program waits 30 seconds in SELW status -- JAVA400-L

I don't know whether this is the solution to your
problem, however the call stack looks like the java
method: java.net.InetAddress.getHostName()

I had a problem on my Win32 machine when I implemented
security. Every time it did a checkSecurity()  it
dropped into that method and it took over 20 seconds
to execute. It looked like some sort of address
resolution problem over the network even though
everything was local. Adding a localhost entry to the
...\WINNT\system32\drivers\etc\hosts  (/etc/hosts on
Unix, as400) file solved the problem.

i.e. 127.0.0.1       localhost


Maybe you have a similar problem.
Mike




--- Dave Wall <dawall@us.ibm.com> wrote: >
> 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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>
>
> _______________________________________________
> This is the Java Programming on and around the
> iSeries / AS400 (JAVA400-L) mailing list
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=== message truncated ===

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