RE: A newbie question. -- JAVA400-L

Success!!!!!!!!! Finally!!!!!  Many thanks to all that contributed to
helping me get this darn CLASSPATH thing working, especially Fred...(You the
man!)  I finally seeing how this whole thing actually works.  It is very
similar to the DOS path type statements.  You basically have to tell it
where to find everything.  The area that gave me the most problems was that
I was not including all of the jar files and the etbjava library at one
time.  I would have the mail.jar and activation.jar files in my CLASSPATH
and not etbjava or vise versa.  So that would explain why I was able to
compile my program at certain points, but not be able to run it.  My
assumption was that when I would run the program from etbjava that like in
DOS it would pick up the classes and possibly the .jar files of the current
directory.  This does not seem to be the case, correct me if I am wrong.
But thanks so much for hanging in there with me!!!  It is nice to know there
is such a place that someone on all levels can go to get help.  Hopefully
this thread may help other newbies that struggling with the CLASSPATH
problem.  It may be a small step for, but the big light bulb just went on!!!


Thanks again!  

Ed B.

> -----Original Message-----
> From: Fred Kulack [SMTP:kulack@us.ibm.com]
> Sent: Monday, January 29, 2001 6:09 PM
> To:   JAVA400-L@midrange.com
> Subject:      RE: A newbie question.
> 
> 
> Ahh... It becomes clear to me. (mostly) 8-)
> 
> 1) Your classpath must be the same when attempting to run as it was
> when you successfully compiled.
> Thus, you cannot expect to be able to add /etbjava/mail.jar to the
> classpath just to get it to compile, then REMOVE /etbjava/mail.jar from
> your classpath to run.
> It just won't work, it's got to be there all the time.
> 
> 2) When java says that it can't find msgsendsample, it's really
> complaining
> about the fact that it can't find one of the classes that msgsendsample
> uses.
> This REALLY sucks, and its gotten me on more then one occasion.
> You can use the -verbose option on the java command line to see
> more detail about what is being loaded and what can't be found.
> 
> 3) When you explicitly specify the -classpath parameter, you
> are COMPLETELY wiping our the classpath that comes from
> other places.
> 
> So, by specifying -classpath etbjava/mail.jar:/etbjava/activation.jar,
> you are losing the classpath set in the environment variable.
> 
> I've never seen the jvm not be able to find java.* classes when
> you explicitly specify the classpath like that, but that looks like
> something you can take care of by using the classpath environment
> variable instead.
> 
> =======
> So, to fix it, I'd do the following:
> 1) in qshell, set the classpath to _everything_ you need.
> I've shown you multiple commands here in an effort to make
> it clear that you should only ADD to the classpath, and not remove
> things that you've ever added before.
> export -s
> CLASSPATH=/QIBM/ProdData/HTTP/Public/jt400/lib/jt400.jar:$CLASSPATH
> export -s CLASSPATH=/etbjava:$CLASSPATH
> export -s CLASSPATH=/etbjava/mail.jar:$CLASSPATH
> export -s CLASSPATH=/etbjava/activation.jar:$CLASSPATH
> 
> 2) cd /etbjava
> 3) javac msgsendsample.java
> 4) if #3 fails, ADD required stuff to the classpath,
>    and repeat #3 until it works. Don't remove any existing
>    stuff.
>    For example "export -s CLASSPATH=/etbjava/newjar.jar:$CLASSPATH"
> 5) After successful compile, run
>    java msgsendsample
> 6) If #5 fails, retry with -verbose option, and
>    look for things that you THINK aren't loading.
>    You might see that they ARE loading.
>    Don't know of a good way to actually identify
>    the thing that caused the problem...
> 
> 
> 
> "Do you believe that my being stronger or faster has anything
>  to do with my muscles in this place?" ... "Free your mind."
> Laurence Fishburne as Morpheus in 'The Matrix'.
> 
> Fred A. Kulack  -  AS/400e  Java and Java DB2 access, Jdbc, JTA, etc...
> IBM in Rochester, MN  (Phone: 507.253.5982   T/L 553-5982)
> mailto:kulack@us.ibm.com   Personal: mailto:kulack@bresnanlink.net
> AOL Instant Messenger: Home:FKulack  Work:FKulackWrk
> 
> 
> "Buckingham, Ed" <Buckingham@AE.com>@midrange.com on 01/29/2001 02:43:19
> PM
> 
> Please respond to JAVA400-L@midrange.com
> 
> Sent by:  owner-java400-l@midrange.com
> 
> 
> To:   "'JAVA400-L@midrange.com'" <JAVA400-L@midrange.com>
> cc:
> Subject:  RE: A newbie question.
> 
> 
> 
> Fred:
> 
> I have tried everything that has been outlined so far.  But I am still
> getting the error.  I am not sure where I am going wrong at.  Is it
> possible
> to step by step walk me through how to get this working?  I seem to be
> just
> spinning my wheels.  This is what I am trying to do:
> 
> My library in QSH as /etbjava.  See below:
> 
> 
>  AllNames.html           QPWXCPC                 dev
>  CSDemo                  QPWXCRB                 etbjava
>  EDI4XXPGM               QPWXCRBD                etc
>  JavaMail                QPWXCSO                 home
>  Manhattan Associates    QPWXCUM                 java
>  Package-main.html       QPWXCWN                 log
>  QCA400                  QPWXCWND                myjava
>  QDBGSVR_CONTROL         QPWXGGA                 packages.html
>  QDLS                    QPWXGGY                 scripts
>  QFileSvr.400            QPWXGOS2                tipfrm
>  QIBM                    QPWXGPC                 tmp
>  QJAVA                   QPWXGRB                 tree.html
>  QLANSrv                 QPWXGUM                 usr
>  QNTC                    QSR                     wanda
>  QOPT                    QSYS.LIB
>  QOpenSys                QTCPTMM
> 
> 
> In the library /etbjava I have the following objects:
> 
> activation.jar          msgsend.java            sendemail.java
> mail.jar                msgsendsample.java      sendfile.class
> msgsend.class           sendemail.class         sendfile.java
> 
> I have deleted the msgsendsample.class file that I once had there.  Now
> when
> I try to compile it I am getting errors.  So I guess the basic first step
> is
> going to be to compile the java program.  See below:
> 
> My CLASSPATH is as follows:
> 
> CLASSPATH=/QIBM/ProdData/HTTP/Public/jt400/lib/jt400.jar:/etbjava
> 
> I did a cd /etbjava so I will be compiling from the correct directory.
> 
>  javac msgsendsample.java
> 
>  msgsendsample.java:13: Package javax.mail not found in import.
>  import javax.mail.*;
>         ^
>  msgsendsample.java:14: Package javax.mail.internet not found in import.
>  import javax.mail.internet.*;
>         ^
>  msgsendsample.java:15: Package javax.activation not found in import.
>  import javax.activation.*;
>         ^
>  3 errors
> 
> From here I see that it can not find my mail.jar & activation.jar files,
> so
> I try the following:
> javac -classpath /etbjava/mail.jar:/etbjava/activation.jar
> msgsendsample.java
> 
>  msgsendsample.java:11: Package java.util not found in import.
> 
>  import java.util.*;
> 
>         ^
> 
>  msgsendsample.java:12: Package java.io not found in import.
> 
>  import java.io.*;
> 
>         ^
> 
>  msgsendsample.java:29: Superclass java.lang.Object of class msgsendsample
> not found.
>  public class msgsendsample {
> 
>               ^
> 
>  3 errors
> 
> 
> Everything I try with the classpath just keeps getting worse.  Would
> someone
> take the time to walk me through, from STRQSH, to setting the classpath,
> to
> compiling and running the program.  We could do this off the list or on.
> I
> am sure I am providing a lot of entertainment for the "seasoned veterns"
> out
> there :-), but I am determined to figure out what is going on, and how to
> get this running.  Please help this sinking ship...
> 
> Thanks in advance...Ed
> > -----Original Message-----
> > From:   Fred Kulack [SMTP:kulack@us.ibm.com]
> > Sent:   Monday, January 29, 2001 2:09 PM
> > To:     JAVA400-L@midrange.com
> > Subject:     RE: A newbie question.
> >
> >
> > Hmm.... I'm thinking you may be incorrectly
> > representing your environment to us, because
> > what you've shown us so far is correct.
> >
> > A couple of things that are a little more esoteric
> > that could be related:
> >
> > Your class name inside the msgsendsample.java file is
> > correctly cased isn't it? I.e. there's not something like
> > class MsgSendSample
> > inside the msgsendsample file is there?
> >
> > You did use BINARY ftp to put those parts up
> > to the AS/400 right?
> > i.e. they are tagged as ascii (CCSID 819) when you look
> > at them with WRKLNK '/etbjava' and use option 8 on
> > them.
> >
> > Did you try to use javac from qshell on the
> > msgsendsample.java source code or just
> > run it from there.
> >
> > Did you try to use the JAVA CL command
> > from the AS/400 command line and manually put
> > in the classpath on the keyword?
> >
> >
> > "Do you believe that my being stronger or faster has anything
> >  to do with my muscles in this place?" ... "Free your mind."
> > Laurence Fishburne as Morpheus in 'The Matrix'.
> >
> > Fred A. Kulack  -  AS/400e  Java and Java DB2 access, Jdbc, JTA, etc...
> > IBM in Rochester, MN  (Phone: 507.253.5982   T/L 553-5982)
> > mailto:kulack@us.ibm.com   Personal: mailto:kulack@bresnanlink.net
> > AOL Instant Messenger: Home:FKulack  Work:FKulackWrk
> >
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