Updating java applet cache
OS X users can only have one JRE available through web browsers so OS X users can not have more than one JRE available through the web browser and will only only have JRE 8 available through the web browser after the upgrade.
Unless you have a support contract with Oracle or a license for Java SE Advanced products you will not be able to get security updates for JRE 7 from Oracle after April 2015 and it is not advisable to keep older versions of Java on your system.
Oracle strives to make new versions of Java backward compatible with earlier versions and the vast majority of Java applications written for older versions of Java will work –without any change- on newer versions of the JRE. Any change in the code –even if only to fix a security vulnerability- has the potential to cause an application to stop working properly.
To revert back from JRE 8 to JRE 7, first uninstall JRE 8. Until Jul 2015, the latest version of JRE 7 can be found on the Download tab of the Java SE section on OTN.
If you would like to remove older JRE versions from your system please use our Java Uninstall Tool to identify and remove older versions.
After Jul 2015 further security updates to JRE 7 will only be available through My Oracle Support and will require a support contract with Oracle. For Windows users, by default, Java applications that are accessed through a web-browser or webstart will use the latest version of Java on the system.