How to create serialized deployment descriptor in EJB 1.0?

Well most of the Application servers have tools for creating the deployment descriptor. But if they do not have it, then you can use the SessionDescriptor class for creating a deployment descriptor for session beans and EntityDescriptor class for entity beans. For further reference refer the following JavaDoc

But remember that EJB 1.1 uses XML for specifying the deployment descriptor and these classes have since been deprecated.