Installing with yum WHAT SEQUENCE MUST BE INSTALLED

Installing with yum
Java(1) & tomcat(2) latest – in case failure, web server LAMPP will remain intact?
PEAR(3) & PECL(4) latest – in case failure, web server LAMPP will remain intact?

FROM THESE 4 ITEMS WITH WHAT SEQUENCE MUST BE INSTALLED IN CENT OS 6 already has LAMPP stack installed?