Calling Java from RPGLE

[Clarky]

I have an interactive RPG program calling a Java method. The first time I make this call, when the JVM starts(I think), I get this screen:



Is there any way to prevent this screen from showing? I think this would be very confusing for the users.

John

[jamief]

Re: Calling Java from RPGLE

can you check authority on:

Incorrect permissions on QOpenSys directory for *PUBLIC

[Clarky]

Re: Calling Java from RPGLE

*PUBLIC has all permissions for /qopensys.

The message doesn't prevent the program from running. I guess I am mainly concerned with making it so the user doesn't see this screen at all. Not sure if there are environment variables I can set. I did find some that looked like they may control this screen, but I have been unsuccessful in getting any of them to work. It only appears the first time a Java method is called. I think it's the JVM being initialized, but not sure.

[ARobb73]

Re: Calling Java from RPGLE

Funny, I only get that screen when I do something that generates an error from a java call. A lot of times you can see what's going on from your job log. Usually there's only a pause while the JVM starts up. Do you see anything funny in your job log?
(Just throwing stuff out here, I use a bunch of Java calls creating spreadsheets, and I don't normally see anything like this unless something goes terribly amiss)

[tomholden]

Re: Calling Java from RPGLE

take a look at the environment variable QIBM_RPG_JAVA_PROPERTIES mine is set like so: '-Djava.version=1.4;-Dos400.stderr=file:stderr.txt;' this routes messages to a file named stderr.txt instead of to the display.

[ARobb73]

Re: Calling Java from RPGLE

Oh nifty! I set my java version, but not the error file... Thanks Tom, that'll be handy in the future.

[Clarky]

Re: Calling Java from RPGLE

Here is what is in my job log:

Environment variable added.
Environment variable added.
Environment variable added.
JVM properties were loaded from a properties file.
The java.version property was detected as input. This property is used as
output only and has no effect on JVM initialization.
Java Virtual Machine is IBM Technology for Java. PID(6029)
JVM properties were loaded from a properties file.

[ARobb73]

Re: Calling Java from RPGLE

Here is what is in my job log:
The java.version property was detected as input. This property is used as output only and has no effect on JVM initialization.
JVM properties were loaded from a properties file.

That is a warning message, when you do a WRKENVVAR what do you see?

[Clarky]

Re: Calling Java from RPGLE

This is what I see when I do a WRKENVVAR:

Name Value
SKIPWASPLUGIN '1'
QIBM_PWRDWNSYS_CONFIRM '*NO'
QIBM_QSH_CMD_OUTPUT 'NONE'
ILE_DEBUGGER_1 'ALLOW_WIDE_SCREEN'
JAVA_HOME '/QOpenSys/QIBM/ProdData/JavaVM/jdk' >
PATH '/QOpenSys/QIBM/ProdData/JavaVM/jdk' >
CLASSPATH './lib/soapclient.jar:./properties:' >
QIBM_RPG_JAVA_PROPERTIES '-Dos400.stderr=file:STDERR.TXT;'
PASE_USRGRP_LIMITED 'N'
LIBPATH '/QOpenSys/QIBM/ProdData/JavaVM/jdk' >
QIBM_PASE_DESCRIPTOR_STD > 'T'
QIBM_JAVA_CHILD_STDIO_CO > 'N'
PASE_QIBM_JAVA_CHILD_STD > 'N'
QIBM_MULTI_THREADED 'Y'
PASE_THREAD_ATTACH 'Y'
AIXTHREAD_STK '524288'
PASE_PATH '/QOpenSys/usr/bin:/usr/ccs/bin:/QO' >
PASE_LANG 'en_US'
QIBM_PASE_CCSID '819'
PASE_LOCPATH '/usr/lib/nls/loc'
PASE_NLSPATH '/usr/lib/nls/msg/%L/%N:/usr/lib/nl' >
PASE_LC__FASTMSG 'true'
PASE_TZ '5,M3.2.0,M11.1.0'
LOGNAME 'JOHN'
HOME '/home/john'
QIBM_IFS_OPEN_MAX '66000'

[Clarky]

Re: Calling Java from RPGLE

Here is what I initially had before I performed the Java call.

ADDENVVAR ENVVAR(JAVA_HOME) VALUE('/QOpenSys/QIBM/ProdData/JavaVM/jdk50/64bit')
ADDENVVAR ENVVAR(PATH) VALUE('/QOpenSys/QIBM/ProdData/JavaVM/jdk50/64bit/bin')
ADDENVVAR ENVVAR(CLASSPATH) VALUE('./lib/soapclient.jar:./properties:./lib')

I just added this, per Tom's suggestion:
ADDENVVAR ENVVAR(QIBM_RPG_JAVA_PROPERTIES) VALUE('-Dos400.stderr=file:STDERR.TXT;')

But it didn't make a difference.

[tomholden]

Re: Calling Java from RPGLE

did you sign off & back on? that only takes affect when the JVM is first loaded.

[Clarky]

Re: Calling Java from RPGLE

Yup, signed off and back on.

Here is what the messages says in my job log:

Message . . . . : The java.version property was detected as input. This
property is used as output only and has no effect on JVM initialization.
Cause . . . . . : java.version was specified as an input property to the
startup of the Java Virtual Machine (JVM). The Classic JVM supported
java.version as an input property for controlling selection of which Java
Developer Kit (JDK) to use. The IBM Technology for Java JVM only uses
java.version as an output property. Selection of a specific IBM Technology
for Java JVM/JDK combination is supported through setting the JAVA_HOME
environment variable.

Here is the message right before it:

Message . . . . : JVM properties were loaded from a properties file.
Cause . . . . . : The Java Virtual Machine used the file
"/QIBM/UserData/Java400/SystemDefault.properties" for loading one or more
properties.
Recovery . . . : If you are encountering property errors within your Java
Virtual Machine, you should check this file for accuracy or delete it.

[ARobb73]

Re: Calling Java from RPGLE

Do you have a program trying to set the Java version with an ADDENVVAR command?

[Clarky]

Re: Calling Java from RPGLE

Also, here are the contents of our "/qibm/userdata/java400/SystemDefault.properties" file:

java.version=1.5
sun.net.inetaddr.ttl=10

[ARobb73]

Re: Calling Java from RPGLE

And are all the Java methods your calling version 1.5 or lower? I only ask because this got me early last week, needless to say my SystemDefault.properties file had version 1.3 while I was using methods that were at least 1.5.