create chroot_java.lst

[Aaron Bartell]

Have two separate requests to create an ibmichroot for Java. Adding this issue so others know I am pursuing it.

[Aaron Bartell]

Running into an issue where I am getting zero response from the Java runtime.

mkdir -p /QOpenSys/space1/QOpenSys/QIBM/ProdData/JavaVM/jdk80/32bit
cp -R /QOpenSys/QIBM/ProdData/JavaVM/jdk80/32bit/* /QOpenSys/space1/QOpenSys/QIBM/ProdData/JavaVM/jdk80/32bit/.
mkdir -p /QOpenSys/litmis/spaces/L7QH2/chroot/QIBM/ProdData/Java400
cp -R /QIBM/ProdData/Java400/* /QOpenSys/space1/QIBM/ProdData/Java400/.

Next I went into the chroot space and ran the following, but it simply returned near immediately without output.

$ /QOpenSys/QIBM/ProdData/JavaVM/jdk80/32bit/bin/java -version 
$

I did a cat of java and see the following:

$ cat /QOpenSys/QIBM/ProdData/JavaVM/jdk80/32bit/bin/java        
#! /usr/bin/sh
# 5722-JV1, 5761-JV1
# (C) COPYRIGHT IBM Corporation 2005, 2015
# All Rights Reserved.
# US Government Users Restricted Rights-
# Use, duplication or disclosure restricted
# by GSA ADP Schedule Contract with IBM Corp.
#
# Licensed Materials-Property of IBM
#


JAVA_HOME='/QOpenSys/QIBM/ProdData/JavaVM/jdk80/32bit'
export JAVA_HOME

# QJAVA/QJVATOOLS has an exit status of 0 if PASE is not 
# yet attached to the process
/usr/bin/system -pieb call QJAVA/QJVATOOLS


if [ "$?" -eq "0" ]; then    # PASE NOT ATTACHED, just call QJVATOOLS
        exec /QSYS.LIB/QJAVA.LIB/QJVATOOLS.PGM java "$@"        
else # PASE attached, call PASE binary
        exec /QIBM/ProdData/Java400/jFromPASE java "$@"
fi

I assume QJVATOOLS.PGM has something to do with spanning the gap to Java when invoked from RPG, so I look to jFromPASE instead. Next I tried to see what jFromPASE has in it, but it's a binary file so I determined to write a hello.java program and see if I could compile and invoke it.

hello.java

class HelloWorldApp {
    public static void main(String[] args) {
        System.out.println("Hello World!"); 
    }
}

Compile hello.java:

/QOpenSys/QIBM/ProdData/JavaVM/jdk80/32bit/bin/javac hello.java

The above doesn't produce a hello.class file.

##Any ideas?

[Former user]

Any Ideas

Well, i chatted a IBM i Java expert. Quick answer, MAY be possible to "slide" Java into a chroot. Truth answer, many moving parts both PASE and ILE for "integrated" Java, hopefully no show stoppers, but clearly difficult task (understatement).

[Aaron Bartell]

Doing repo upkeep. I am going to put this issue in a status of "on hold" for now until we hear back from the IBM i Java expert.