More details to the problem described in the first email.
I have now tried another scenario:
My parent class (B) is now sitting in a jar in WEB-INF/lib.
My subClass (A) is in a .class in WEB-INF/classes.
B and A are in different packages (p1.x.B and p2.A).
The code with the casting issue is in a static method of A.
B b = doSomething(); -> Works
log("B " + b.getClass().getName()); -> p1.x.B
log("B " + b.getClass().getClassLoader()); -> CL1
log("A " + A.class.getClassLoader()); -> CL2 (seems to be =
to CL1)
( b.getClass().getClassLoader()) ==
Class.forName("p2.A").getClassLoader())); -> true
( b.getClass().getClassLoader()) ==
Class.forName("A").getClassLoader())); -> Class not found...
A a = (A) doSomething(); ->
ClassCastException...
I have been through extensive web search. It seems that this problem is
not uncommon but I cannot figure out how to solve it...
(How do you get the instance id for the ClassLoaders? In the output in
my first email, my class loaders are giving me a name, not a unique id)
Help!
Thierry
-----Original Message-----
From: Thierry Thelliez [mailto:[EMAIL PROTECTED]]
Sent: Saturday, July 13, 2002 6:04 PM
To: [EMAIL PROTECTED]
Subject: ClassCast exception
Hello,
I have a ClassCast problem. I read the archive and attempted few
suggestions (like grouping everything in one jar in WEB-INF/lib) without
success.
I am using tomcat 4.0.4 and 1.3.1_02 under Solaris.
Someone suggested looking at the ClassLoaders. The following is
generated by something like:
Log4j("MyClass " + MyClass.class.getClassLoader());
--------------------------------------------------------------------
2002-07-13 18:36:56,808 - - MyClass WebappClassLoader
available:
delegate: false
repositories:
required:
----------> Parent Classloader:
StandardClassLoader
available:
delegate: true
repositories:
file:/serverPath/jakarta-tomcat-4.0.4/classes/
file:/serverPath/jakarta-tomcat-4.0.4/lib/jasper-runtime.jar
file:/serverPath/jakarta-tomcat-4.0.4/lib/jasper-compiler.jar
file:/serverPath/jakarta-tomcat-4.0.4/lib/naming-factory.jar
required:
----------> Parent Classloader:
StandardClassLoader
available:
Extension[javax.mail, implementationVendor=Sun Microsystems, Inc.,
implementationVendorId=com
.sun, implementationVersion=1.2, specificationVendor=Sun Microsystems,
Inc., specificationVersion
=1.2]
delegate: true
repositories:
file:/serverPath/jakarta-tomcat-4.0.4/common/classes/
file:/serverPath/jakarta-tomcat-4.0.4/common/lib/naming-common.jar
file:/serverPath/jakarta-tomcat-4.0.4/common/lib/servlet.jar
file:/serverPath/jakarta-tomcat-4.0.4/common/lib/naming-resources.jar
file:/serverPath/jakarta-tomcat-4.0.4/common/lib/jdbc2_0-stdext.jar
file:/serverPath/jakarta-tomcat-4.0.4/common/lib/activation.jar
file:/serverPath/jakarta-tomcat-4.0.4/common/lib/jta-spec1_0_1.jar
file:/serverPath/jakarta-tomcat-4.0.4/common/lib/xerces.jar
file:/serverPath/jakarta-tomcat-4.0.4/common/lib/tyrex-0.9.7.0.jar
file:/serverPath/jakarta-tomcat-4.0.4/common/lib/mail.jar
file:/serverPath/jakarta-tomcat-4.0.4/common/lib/jndi.jar
file:/serverPath/jakarta-tomcat-4.0.4/common/lib/cos.jar
required:
----------> Parent Classloader:
sun.misc.Launcher$AppClassLoader@3f52a5
---------------------------------
just after that I try a Class.forName("MyClass");
but I get a ClassNotFound exception.
Is that normal that I don't see listed the webapps/myApp/WEB-INF/lib in
the repositories above?
In the ClassCast issue, both classes return the same loader.
Thanks,
Thierry
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