Mariano why your proxy class does not have at least a format, methodDict and superclass? In the past Behavior new something was carashing the vm because methodDict was nil and boum it crashed. I fixed that long time ago. Now I think that a class proxy cannot be just the same as an object proxy from the vm look at structure. Stef On Sep 28, 2010, at 10:29 PM, Mariano Martinez Peck wrote:

Hi folks. I am trying to do something and I found a VM crash. Suppose I want to swap out a class, do a become with a proxy (that with the DNU will load the class back). In addition, I have instances of the swapped class.

Example of code (will crash in the last line):

o := MyObject new. o foo: 123. p := ClassProxy new. p become: MyObject. o == nil. o foo.

My Object just extends Object, has an instVar 'foo', and implements the accessors.

ClassProxy implements:

become: aClass className := aClass name. aClass fileOut. super become: aClass

and

doesNotUnderstand: aMessage | reloadedClass | (FileStream fileNamed: className, '.st') fileIn. reloadedClass := Smalltalk at: className. self becomeForward: reloadedClass. ^aMessage sendTo: reloadedClass

So....does someone know why the crash?

how can I solve it ?

Thanks in advance

Mariano _______________________________________________ Pharo-project mailing list Pharo-project@lists.gforge.inria.fr http://lists.gforge.inria.fr/cgi-bin/mailman/listinfo/pharo-project