docs: public Class<?> getEJBPrimaryKeyClass(J2EEName j2eeName) {
          Class<?> rtnPKeyClass = null;
          BeanMetaData bmd = internalBeanMetaDataStore.get(j2eeName);
          if (bmd != null) {
              rtnPKeyClass = bmd.pKeyClass;
          }
          return rtnPKeyClass;
      }