I recently had to migrate to a new machine and re-installed Eclipse. At the moment, I need to generate JAXB classes from an xsd. I cannot quite remember what I installed, b
If you don't have JavaEE:
Help>>Install New Software>>Works with:--All Available Sites--
Search for JAXB
Then select Web, XML, Java EE and OSGi Enterprise Development and install.
After you restart Eclipse you should see the generate option.