We have a session bean that has looked up and narrowed the home of an entity bean. It successfully uses a finder method on the home. It then tries to pass the reference to the home as an argument in a method of a helper object at which point the VM throws a NoClassDefFoundError with the name of the home interface. Any suggestions on why this happens? An identical problem occurs when we try pass a reference to an EJBObject as an argument in the method of a helper object. The error makes no sense as a NoClassDefFoundError is something that should only occur when the VM can't find a .class file. Yet in this case the classes in question are successfully used prior to the error being thrown. - Colin Naturman Visoft