On Wed, 01 Feb 2006 08:17:33 +0100, baliuka juozas <[EMAIL PROTECTED]>
wrote:
Thread.getContextCL() is the only way. If a library
doesn't use
Thread.getCCL() then it is a poorly written library.
No, this kind of library it just not designed to be
used as shared library, if library is deployed with
application then "MyClass.class.getClassLoader()" is
the right classloder (you do not want to have more
than one classloader per application). Thread.getCCL()
is usefull for container provider libraries or for
exotic application deployment (in shared/lib) to save
memory for class instances.
No! ;) Anything else than *very special cases* should always
consult the current thread context classloader and if that
does not help then MyClass.class.getClassLoader() or any other
"fallback" classloader.
And a library that is not designed to be a library is a poor library ;)
"you do not want to have more than one classloader per application",
exactly thus always
use the ONE classloader - thread ctx classloader
"to save memory for class instances." ...no it is to ensure the same class
is loaded
the same way everytime..otherwise the same named class can become
incompatible with
later loaded classes - especially if the libraries tries to invoke
application/user provided code.
...and yes, this case is mostly visible in "container" scenarios as J2EE,
but almost any
kind of app will get to that level very fast (even in standalone rich
clients) and thus all
libraries (no exceptions) should use Thread.getCCL() by default (if not
the only way) otherwise
they are useless in most applications.
--
--
Max Rydahl Andersen
callto://max.rydahl.andersen
Hibernate
[EMAIL PROTECTED]
http://hibernate.org
JBoss Inc
[EMAIL PROTECTED]
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