Bugs item #693239, was opened at 2003-02-25 23:17
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Category: JBossServer
Group: v3.0 Rabbit Hole
Status: Open
Resolution: None
Priority: 5
Submitted By: Thomas Pasch (aanno)
Assigned to: Nobody/Anonymous (nobody)
Summary: JBoss ClassLoader implementation is unappropriate for EJB co
Initial Comment:
The Problem
--------------
EJB (jar), WEB (war), and enterprise (ear) archives
should be isolated from another. This especially means
that:
(a) independant packed components could use different
version of a file with the same qualified name
(b) independant packed components could call each
other (i.e. home, remote, and local interfaces)
JBoss ClassLoader design will cache all Class instances
globally in standard configuration. This violates (a). It is
possible to switch to (ear) archive-wise caching. But this
violates (b), because the (client interfaces) packed with
component 1 will be loaded with a different ClassLoader
than the interface definition packed in component 2 (that
also implements the bean) if both components are
deployed on the same JVM. Violation of (b) normally
shows up in a ClassCastException in
PortableRemoteObject.narrow().
In summary it is impossible in JBoss to adhere to (a) and
(b) at the same time.
Proposed solution
------------------
There are two ways around this problem:
- disable the local call optimisation for call between
independant packed components or
- use a IIOP like scheme for all calls. IIOP will only
transfer data members of object instances. It will NOT
share Class implementation between independant packed
component.
Kind regards,
aanno
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>Comment By: Thomas Pasch (aanno)
Date: 2003-03-10 12:05
Message:
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I put this point to a broader discussion at
http://www.jboss.org/forums/thread.jsp?forum=92&thread=289
64 . I also proposed an other solution to this problem there. I'm
currently not sure if I would have posted this better as RFE
(but I'm still inclined to regard this as bug). Some developers
are also working on the very same problem. See their thread
at
http://sourceforge.net/mailarchive/message.php?msg_id=3852
655 . This work is sometimes referred as Hierachical
ClassLoader. I really think that their proposal is not an
appropriate solution, though...
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