Re: STRDBG/ENDDBG required to prevent Java open exception

Hi Barbara,

No, not at all; it should definitely not close those descriptors.  It
may coincidentally open those descriptors, but it is just as likely to
open descriptors 14-16, or maybe 14, 25, 34.  It just seems to be
necessary to have at least 3 descriptors open for some aspects of Java
I/O to work correctly.

   When using the Invocation API to run Java programs, the destination for
   STDOUT and STDERR is controlled by the use of an environment variable
   called QIBM_USE_DESCRIPTOR_STDIO. If this environment variable is set
   to Y or I (for example, QIBM_USE_DESCRIPTOR_STDIO=Y), the Java virtual
   machine uses file descriptors for STDIN (fd 0), STDOUT (fd 1), and
   STDERR (fd 2). In this case, the program must set these file descriptors
   to valid values by opening them as the first three files or pipes in this
   job. The first file opened in the job is given fd of 0, the second fd
   of 1, and third is fd of 2. If the environment variable
   QIBM_USE_DESCRIPTOR_STDIO is not set or is set to any other value, file
   descriptors are not used for STDIN, STDOUT, or STDERR. Instead, STDOUT
   and STDERR are routed to a spooled file that is owned by the current job,
   and use of STDIN results in an IO exception.

This quote is from the followng page:
http://publib.boulder.ibm.com/infocenter/iseries/v5r4/index.jsp?topic=/rzaha/invocapi.htm

I don't believe the descriptors are actually used for the 3 I/O streams by Java. At least, all the evidence I have seen suggests that they aren't used.