Java 2 Platform, Enterprise Edition: Platform and Component Specifications

Chapter EJB.18 describes the issue of using JDK 1.1 versus Java 2 in detail.

In summary, the bean provider can produce enterprise beans that will run in both JDK 1.1 and Java 2 platform based containers. The container provider can use either JDK 1.1 or Java 2 platform as the basis for the implementation of the container.