WAS 4.0.1: ClassNotFoundException when inner classes superclass loaded by AEX-loader?
Kai Lindfors
I've had some problems with inner classes and after various experiments it
seems to me that WAS behaves as follows:
-Class X has a public static inner class Y. Class Y inherits from class Z.
-Class X is installed within a war-file in installedApps as usual
-Class Z is installed within a jar-file into lib/app
-When instantiating an object of class Y within a method of X the following
exception occurs:
Servlet Error: X$Y: java.lang.ClassNotFoundException: X$Y
at java.net.URLClassLoader.findClass(URLClassLoader.java(Compiled Code))
at java.lang.ClassLoader.loadClass(ClassLoader.java(Compiled Code))
at java.lang.ClassLoader.loadClass(ClassLoader.java(Compiled Code))
at java.lang.Class.forName1(Native Method)
at java.lang.Class.forName(Class.java:134)
However, if class Z is also installed within the same war-file as X and Y,
everything works just fine.
In other words, does this mean that a public static inner class loaded by an
application classloader (as defined in Infocenter 'Application Server AE,
6.4.1') cannot inherit from a class that is loaded by AEX-loader or any
other loader above it?
Class Z is a class that fits the purpose for AEX-classes exactly - in other
words it is shared among all applications and I'd hate to quit using inner
classes.
Any comments?
Kai Lindfors
David Artus
Never tried it myself. Intuitively it seems strange that there would be a
difference between the case you describe and other uses of lib/app.
It is possible that you have uncovered a very interesting bug. The only
way to get this addressed is to raise a formal problem report with
IBM support.