[tcljava-user] Some questions

[John S. <JS...@Po...>]

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?

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
template create 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