I need to compare 1) JSP & compiled JAVA code  and 2) PHP in the
development of  web applications that are going to use the MySQL
database and the automatic integration of some XML web services. Is
there a way to measure the difference in speed or the cpu
requirements?

Resources:

* http://www.phppatterns.com/index.php/article/articleview/12/1/3/
* http://www.tek271.com/articles/JavaOrPhp.html
* http://www.onjava.com/pub/a/onjava/2003/10/15/php_scalability.html

Performance:
* you cannot compare PHP & Java performance because both languages has
different  purpose
* my friend (employee of Sun) tried to compare JSP vs PHP in
performance and he found that Java is slower, bytecode faster than
PHP. But he didn't compared performance with PHP optimizers, which
should be faster than Java bytecode

Conclusion:
* because of hardware and software licences price PHP is cheaper than Java/JSP
* developement in PHP is faster
* XML services shouldn't be problem in PHP5 - http://www.php.net/xml
* J2EE has better integratio with corporate services

Advice:
* Use Java only if you want integrate your project with desktop
applications or you need really secure enviroment
* In other cases I would recommend You to use PHP with Smarty
(http://smarty.php.net and built-in cache) and Turck Mmcache
(http://turck-mmcache.sourceforge.net/) optimizer.
* Do not forget to enable cache in MySQL - http://www.petefreitag.com/item/390.cfm