It can be done. The backend java programs have to be called through another scripting interface. From your front end, you could call PHP which intern calls your java wrapped in bash to perform strictly backend tasks, CRUD, data processing, cross platform RMI, email processing, and anything which you could do with java. Your java environment has to be well resourced.

With the resources well in place, speeds and reliability would be attained better than working with Spring. Spring has its own overheads.

I did this on Linux and Unix. I have never tried it on Windows.