[tcljava-user] Some questions ( no HTML now )

[Jesus M. S. Jr. <jm...@ih...>]

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My apologies to everyone on the list ( and to Mo ). I was using the mail
gateway to my mailbox at work, and apparently there was no option to turn on
or off HTML formatting ... and all the while I thought things were being sent
as plain text. So I am sending the questions again using a new subscription 
with my home e-mail address.


I am a Java developer, with some basic knowledge of Tcl. I am intersted
mainly in Tcl calling Java methods. In the end, I want to use it with
Vignette's StoryServer.

I have recently downloaded and tried TclBlend on both linux and Solaris, and
they worked as expected.

However, I still have some few questions that I cannot find in the FAQ.

1) In the man page for "package require java", it said that "Tcl will create
a JVM in Tcl's process space". What does this exactly mean? In both linux and
solaris, when I call "package require java" in a Tcl shell, I cannot see a
java process runnning ( even with linux's "ps axf" command ). To be honest, I
was expecting a Java process somehow as a child of the tcl process, but that
does not seem to be the case. What are the differences ( and implications )
between what I was expecting and what tclblend actually does?

D.J.: You mentioned that they would show as child processes with linux's "ps"
command. However, I tried that several times .... within a tclsh just after
"package require java", after a "[java::new ]" .... and I do not see such
child processes.


2) How many JVMs are created within the lifetime of the tcl process? For
example, if multiple tcl scripts have a "package require java" as the first
line of each of the script, will each call to "package require java" create a
new JVM?

3) This last question maybe a bit offtopic ... but with StoryServer ( SS ), a
SS template can be called multiple times by different browsers at the same
time ( multi-threaded ). Within Vignette's installation page for TclBlend,
the TclBlend binary distribution does not seem to be any different ( e.g.: no
proprietary extension seems to be required or installed to make TclBlend work
with SS ). With this regard ( threading ), will each call to the templatec
reate a separate JVM?

Probably a better way to ask question [3] is: If I was doing threading in
Tcl, will each thread run its own JVM?


Thanks in advance,

John Salvo
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