After Installing required JRE if you require to upgrade Eclipse version then kindly follow following step to upgrade eclipse java version:
You can add the -vm option to eclipse.ini:
-vm
c:/<path>/java/<javaName>/bin/javaw.exe
path : directory where Java is installed
javaName:Name of JDK/JRE installed.
After updating eclipse.ini file, eclipse.ini file may look like this :
-startup
plugins/org.eclipse.equinox.launcher_1.3.0.v20130327-1440.jar
--launcher.library
plugins/org.eclipse.equinox.launcher.win32.win32.x86_1.1.200.v20130807-1835
-product
org.eclipse.epp.package.jee.product
--launcher.defaultAction
openFile
--launcher.XXMaxPermSize
256M
-showsplash
org.eclipse.platform
--launcher.XXMaxPermSize
256m
--launcher.defaultAction
openFile
-vm
C:\Program Files (x86)\Java\jre7\bin\javaw.exe
--launcher.appendVmargs
-vmargs
-Dosgi.requiredJavaVersion=1.6
-Xms40m
-Xmx512m
