On 28/04/2017 12:16 PM, Andrew Rowley wrote:
On 28/04/2017 1:28 PM, David Crayford wrote:
I agree that it would be ideal if the JZOS batch launcher was
modernized to support wildcards but disagree about the shell. I find
it's absolutely necessary just to do stuff like:
. /etc/profile # set TZ variable and other stuff
Whether there should be a system wide TZ variable is another
discussion :-) I'm not sure there should be anything else in
/etc/profile that is required for every java batch job.
Imagine if you had to go and update all your Java batch jobs to set the
TZ environment variable every time the clocks changed! Yikes!
/etc/profile usually has other useful settings like LOCALE, LANG etc.
It's also unfortunate that the DD is called STDENV but is doesn't
follow the same conventions as BPXBATCH STDENV (I'm not sure which
came first).
I have no argument with the facility to run a shell script, it's just
the *requirement* for a script, and mainly the need to customize it
for CLASSPATH that I object to. Java classpath can hard enough to
figure out without dealing with shell script for-do-done loops and the
syntax complexities of shell variables, braces, quotes, wildcard
expansion etc.
I don't have a problem with it. It works well for me and while I agree I
would like to see it modernized it's good to go but I'a a UNIX guy who
is comfortable with shell programming.
I suspect it deters a lot of people from using Java on z/OS: they find
that script and think "Hmmm, maybe I'll try Rexx first".
If I'm considering Java then it's certainly not for a solution that REXX
can handle. REXX is good for very simple scripts but doesn't scale
either for large programs or complex use cases. For most of my stuff I
would just use C++ but I reach out for Java when I need a library that I
don't have in C++, and that's quite often ;) Like it or loathe it Java
in out on it's own WRT the huge amount of open source libraries to do
useful stuff. And they are usually of a very high quality. I've been
working on a z/OS web application using a servlet container with
JAX-RS/Jackson and Java has proven it's worth. It's pretty snappy too
once the JIT has warmed up.
What would be ideal: STDENV DD to set environment variables in exactly
the same way as BPXBATCH, and maybe something like SCRIPT DD for an
optional initialization script.
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