looking for URL

[jknutson]

I hate to waste mailing list bandwidth this way, but I've been asked for
the URL for an article I read recently that quoted an IBMer making some
statement about J2EE vs. WebSphere.  I believe it was an article on
linuxgrrl but I can't track it down there as the home page doesn't seem to
be doing a lot.

If someone could send me this URL, I'd appreciate it.



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open source IBM

[jknutson]

Perhaps what people have been hearing is that IBM will make their Jikes
compiler open source?Apparently it will be in the developerWorks Open
Source arena.



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IBM press release

[jknutson]

Someone sent this URL to me.  I haven't read it yet, but it might be of
interest to people on the list...

http://www.ibm.com/developer/features/ibm_commitment.html



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Re: official linux j2ee sun release

[jknutson]

That's great, only you follow their links to find the download page which
hasn't been updated in months, hence, no linux download


I don't suppose anyone out there has any idea when IBM's WebSphere
application server version 3 *advanced* is going to be made available for
linux... Or is it not going to be made available?  Or is it already
available, and simply not advertised anywhere?




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IBM 1.3 full release

[jknutson]

Their "porting plans" page indicates that the full 1.3 release of IBM's JDK
is supposed to be available, however, the URL it links to is nonfunctional.

The link I'm seeing is http://www6.software.ibm.com/dl/dklx130/dklx130-p
but that is 404.  Is anyone on the list able to find the right location?




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Using DB2 w/ Sun J2EE server

[jknutson]

I've been using the sun 1.2.2 SDK along with the sun 1.2.1 enterprise SDK
on a linux box.  The intent is to learn how to effectively use EJB to
access a data warehouse.

I've managed to get through the first five lesson's in Monica Pawlan's
"Writing Enterprise Applications with Java 2 SDK, Enterprise Edition" using
the Cloudscape database, but I'm starting think about how to solve my own
problems using our RDBMS, DB2.

Has anyone out there successfully used DB2 with the sun reference EJB
server?  Cloudscape works, setting the entity bean database JNDI name to
jdbc/Cloudscape, but I expect db2 to be slightly more complicated.  But if
I were to guess, I'd say that you need to be running db2jd and use
"jdbc/db2/" as the jndi name.  I haven't tried yet.  I still
have a lot to learn :-)

Anyway, if someone has info to share I'd appreciate it.




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Re: Using DB2 w/ Sun J2EE server

[jknutson]

Thanks to Larry Sanderson at Sun for pointing me in the right direction:
j2sdkee1.2.1/config/default.properties (documented in
doc/release/ConfigGuide.html, guess I should have RTFM)

I've had a little better success since then (after fixing the case error in
the driver name).  Unfortunately I still haven't managed to get a
functional system.

As per instructions, I added the db2 driver and datasource to the
properties file, thus:
jdbc.drivers=COM.cloudscape.core.RmiJdbcDriver:COM.ibm.db2.jdbc.app.DB2Driv
er
jdbc.datasources=jdbc/Cloudscape|jdbc:cloudscape:rmi:CloudscapeDB;create=tr
ue|jdbc/db2|jdbc:db2:

DB2 has two jdbc drivers, COM.ibm.db2.jdbc.app.DB2Driver, used for
applications, and COM.ibm.db2.jdbc.net.DB2Driver, used for applets.  I've
used a sample application that uses the application driver, so I know it
works.  However, the JVM used by the j2ee server dies with a SIGSEGV (and
lots and lots of debug output) if I try to use the application driver with
EJB.  If I try to use the applet driver, I end up with a
java.sql.SQLException: No suitable driver.  The EJB server doesn't put out
any output at all, not even to the logs, for this.

I thought there might be an issue that the drivers are actually JDBC 2.0
and not 1.2 (or whatever the earlier "latest" was/is), but there doesn't
seem to be any support for JDBC 2.0 from DB2 for linux.


It's looking like noone else has tried using this combination so I may be
stuck (or more accurately I may simply have to use bean managed persistence
everywhere), but hopefully someone out there has an idea on how to proceed
they'd be willing to share...




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Re: Antwort: Re: Using DB2 w/ Sun J2EE server

[jknutson]

I apologize in advance for the excessive quoting.  I'm using Lotus Notes,
which sucks for this sort of thing (that is to say, internet email).  Ah,
well.

Anyway, thanks for the info.  Since my last message I've gone and dug up
IBM's WebSphere application server advanced for Linux, which appears to
have been made available in June.  I'm guessing it works with DB2, but I
haven't been able to verify that yet.  I went through a tutorial to
familiarize myself with IBM's "console" UI, and at the moment there are 135
java threads/processes on my system.  The load average is over 50.  This is
using IBM's JDK 1.1.8 (I've tried other JDKs with WAS to no avail), where
there are no green threads available.

I have to wonder what WAS performs like on other systems.  Sun's EJB
server, AFAIK, is just a reference server and isn't really intended to be
used for deployed systems, but it's good for learning.  I may go back to it
for the time being if the information you provided does the trick.

As far as the advantages of EJB... By itself, I really don't know for sure.
To some extent, I think using EJB instead of pure JDBC makes it so you
don't have to think quite so hard about multi-user issues.  You just tell
the server what restrictions there are on the various bean methods and it
organizes connections and transactions accordingly in what (one hopes) is
an optimal manner.  Having dealt with locking and other similar issues
before, I can see a fair amount of value in that.

But for me, there's also the capabilities provided by servlets and JSP.
For what I'm doing, minimizing client side effort is a good thing.  I'm
still learning all this, so that's about as much information as I can
provide :-).





"Stefan Kahle" <[EMAIL PROTECTED]> on 08/02/2000 06:59:54 AM

To:   John Knutson/GISD/SGG/ARLUT
cc:   [EMAIL PROTECTED]
Subject:  Antwort: Re: Using DB2 w/ Sun J2EE server





Hi,
i had a similar problem running a java-servlet with access to DB2 data. My
enviroment is Linux Kernel 2.2.x, DB2 V7.1, blackdown jdk, SUN servlet
engine. I used the COM.ibm.db2.jdbc.net.DB2Driver and it run when i put the
(IP-) name of server where db2jd is running and the port of db2jd into the
datasource.
Try this:
db2jstrt 6789
jdbc.datasources=jdbc:db2://:6789:/
Perhaps You can tell me what the advantage of EJB in accessing the data of
a data warehouse is. I'm building a dataware house too and looking for a
good method to access the data.
/Stefan Kahle



jknutson@arlut.
utexas.edu An: [EMAIL PROTECTED]
   Kopie:
27.07.00 16:15 Thema:  Re: Using DB2 w/ Sun
J2EE server




Thanks to Larry Sanderson at Sun for pointing me in the right direction:
j2sdkee1.2.1/config/default.properties (documented in
doc/release/ConfigGuide.html, guess I should have RTFM)
I've had a little better success since then (after fixing the case error in
the driver name).  Unfortunately I still haven't managed to get a
functional system.
As per instructions, I added the db2 driver and datasource to the
properties file, thus:
jdbc.drivers=COM.cloudscape.core.RmiJdbcDriver:COM.ibm.db2.jdbc.app.DB2Driv
er
jdbc.datasources=jdbc/Cloudscape|jdbc:cloudscape:rmi:CloudscapeDB;create=tr
ue|jdbc/db2|jdbc:db2:
DB2 has two jdbc drivers, COM.ibm.db2.jdbc.app.DB2Driver, used for
applications, and COM.ibm.db2.jdbc.net.DB2Driver, used for applets.  I've
used a sample application that uses the application driver, so I know it
works.  However, the JVM used by the j2ee server dies with a SIGSEGV (and
lots and lots of debug output) if I try to use the application driver with
EJB.  If I try to use the applet driver, I end up with a
java.sql.SQLException: No suitable driver.  The EJB server doesn't put out
any output at all, not even to the logs, for this.
I thought there might be an issue that the drivers are actually JDBC 2.0
and not 1.2 (or whatever the earlier "latest" was/is), but there doesn't
seem to be any support for JDBC 2.0 from DB2 for linux.

It's looking like noone else has tried using this combination so I may be
stuck (or more accurately I may simply have to use bean managed persistence
everywhere), but hopefully someone out there has an idea on how to proceed
they'd be willing to share...



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To: [EMAIL PROTECTED]
Cc: [EMAIL PROTECTED]








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Re: CVS vs RCS vs ? Thanks

[jknutson]

I haven't put up anything because I assumed commercial products were "right
out".  We use perforce (www.perforce.com) for our configuration management.
It sits on top of RCS.  As I said, it is a commercial product, but they do
support a lot of platforms including linux.  We have servers running on
both linux and solaris.

There's supposedly an emacs mode for it, but I haven't used it yet.





Greg Lewis <[EMAIL PROTECTED]> on 11/14/2000 09:34:31 PM

To:   Barnet Wagman <[EMAIL PROTECTED]>
cc:   "[EMAIL PROTECTED]" <[EMAIL PROTECTED]> (bcc:
  John Knutson/GISD/SGG/ARLUT)
Subject:  Re: CVS vs RCS vs ?  Thanks




Barnet Wagman wrote:
> Thanks for the advice.  CVS is clearly the system to use.
Well, noone else has really put forward any other alternatives ;).  You
could also look at similar systems such as
Aegis 
PRCS 
etc.
You can find a comprehensive list in the "Configuration Management Tool
Summary" at http://www.iac.honeywell.com/Pub/Tech/CM/CMTools.html
 - Greg

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