On 28/04/2017 9:13 AM, Andrew Rowley wrote:
On 28/04/2017 3:23 AM, Kirk Wolf wrote:
And yet I fail to see why this is an issue since the JZOS sample JCL
shows
how to use the shell language to handle this - with more flexibility.
For example, the "java" command launcher can't do this:
for i in "${MYDIR}"/foo*.jar; do
CLASSPATH="$CLASSPATH":"$i"
done
I love JZOS, except for this shell script. I feel that a tailored
shell script in every Java batch job is a major obstacle, because as
you say "most Java users don't know their shell". Even more so for
most z/OS users.
I agree that it would be ideal if the JZOS batch launcher was modernized
to support wildcards but disagree about the shell. I find it's
absolutely necessary just to do stuff like:
. /etc/profile # set TZ variable and other stuff
You are just setting the CLASSPATH environment variable, so yes you
can do the same thing using the java command in BPXBATCH if you need
to (apologies for naming my program ClassPath, which is slightly
confusing):
//S1 EXEC PGM=BPXBATCH,REGION=512M
//STDENV DD *
CLASSPATH=java/target
//STDPARM DD *
SH for i in java/lib/slf*.jar; do
CLASSPATH="$CLASSPATH":"$i";
done;
export CLASSPATH="$CLASSPATH";
/usr/lpp/java/J8.0/bin/java ClassPath
//STDOUT DD SYSOUT=*
//STDERR DD SYSOUT=*
Output:
java/target:java/lib/slf4j-api-1.7.21.jar:java/lib/slf4j-simple-1.7.21.jar
/home/andrewr/java/target/
/home/andrewr/java/lib/slf4j-api-1.7.21.jar
/home/andrewr/java/lib/slf4j-simple-1.7.21.jar
It's the handling of the CLASSPATH environment variable that's the issue.
I have been playing around with PROCs to try to simplify things so you
can use more traditional JCL for JZOS jobs (hence my other questions
about JCL substitutions in instream data).
e.g.
//JAVA EXEC PROC=JAVA8G,
// JAVACLS='''MyProgram''',
// APPHOME='''java/target''',
// CLASPATH='''java/lib/*:java/easysmf-je-1-5-2/jar/*'''
//INPUT DD DISP=SHR,...
It is difficult to handle the classpath like this if you need to allow
multiple entries and support any sort of wildcard. It would be much
easier if it followed the same rules as the java command.
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