Re: classloading from so

[Tom Tromey <tromey at redhat dot com>]

>>>>> "Lars" == Lars Andersen <lars@rimfaxe.com> writes:

Lars> What if an app loaded that class, then lib-org-pack.so is
Lars> recompiled.  If the app should issue another class.forName,
Lars> would it load the newly compiled .so ? Or would the app have to
Lars> be restarted?

The app would have to be restarted.  Currently we never unload shared
libraries.

It appears if you use the SharedLibLoader, instead of the built-in
one, then you can get class unloading.  I have never tried it, but I
do note that SharedLibLoader.finalize() calls dlclose().  Of course,
for this to work, the SharedLibLoader and all its classes must be
collected.

Lars> And another related question : Is there some debugging trick to
Lars> tell which classes are executed as native code, and which are
Lars> interpreted?  (I want to check if it loads the .so just right,
Lars> and isn't interpreting some class from CLASSPATH)

There are lots of ways.  You could set your class path to point to a
directory where no .jar files exist.  Or you could run your program in
the debugger and see what is happening.  Or use ltrace.  Or get a raw
stack trace (you'd have to set a system property; see NameFinder.java
for the list) and make sure that there are no interpreter frames.

Tom