Re: Unable to access class files

[Blair Wyman <wyman@xxxxxxxxxxxx>]

Excerpts from java400-l: 27-Apr'00 Unable to access class files
Marco_Van_Maris@ept.lu (1043*) 

> I don't seem to be able to make javac find classes in package
> com.ibm.as400.access.  I tried to modifiy CLASSPATH and also used the
> classpath options of javac and javap and even unpacked the original jar
> into its constituent files. 

> CLASSPATH is set as follows: 
> CLASSPATH=/QIBM/ProdData/HTTP/Public/jt400/lib/jt400.jar 

If this is the exact command you used to set the CLASSPATH, then I see
what's wrong.  The issue is not unique to QShell; it applies to all
UNIX-like command shells, though the syntax depends on the shell.  The
issue involves the "visibility" of a variable to its child processes.   

When you set a variable like: 
        MYVAR=some_value 
then MYVAR is only visible to the "current" shell -- it is not passed to
child processes (such as javac) in the environment. 

In order to tell the shell to put the variable into the environment for
child processes, you need to use the 'export' command, like so: 
        MYVAR=some_value 
        export MYVAR 

This is typically elided into a single command: 
        export MYVAR=some_value 

So, for the CLASSPATH example, you could use: 
        export CLASSPATH=/some/dir:/some/other/dir/with/maybe.jar 

NOTE: If I remember correctly, in V4R3 you had to specify the -s
parameter on the 'export' statement, due to some implementation details
unique to Java/QShell interactions.  So, you'd need to use: 
        export -s CLASSPATH=/QIBM/ProdData/HTTP/Public/jt400/lib/jt400.jar 

In V4R4 and later, the -s is tolerated but not required. 

> The following command does not work either: 

>  javap -classpath /QIBM/ProdData/HTTP/Public/jt400/lib/jt400.jar
> com.ibm.as400.access.AS400 
>  com.ibm.as400.access.AS400: no such class 

This is a little spookier...  I suspect we didn't get the javap's
"-classpath" parameter implemented quite correctly... 

Of course, the stock question is always "Are you up-to-date on your
PTFs?"  :)  There is a "group PTF" for Java that lets you get current in
one fell swoop.  To determine if you have the latest group PTF
installed, you can do: 

        DSPDTAARA DTAARA(QJAVA/SF99066) 

You should see   

        Group PTF#: SF99066-06 V4R3M0 07/26/1999  

If you don't see this, or if the data area isn't found, I think the
answer is as simple as ordering SF99066 through your regular support
channels, and a CD will get sent to you containing all the required PTFs
to get you updated. 

Hope this helps, 

-blair 

  ___   _           Blair Wyman                  IBM Rochester 
 ( /_)  /  _  ' _   (507)253-2891            blairw@us.ibm.com 
__/__)_/_<_/_/_/_'  Opinions expressed may not be those of IBM 

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