java - Eclipse Mars starts with exit code=1 when using JDK 8 -

i plan moving eclipse mars , installed 64 bit version on windows 7. since jboss tools require java 8, downloaded jdk 8u51 , unzipped programs (x86) folder. want keep jdk 1.7.0 system's default jvm, did not install java 8.

furthermore, updated eclipse.ini, points new jvm. jdk 1.7.0 eclipse mars installation launched without problems, jdk 8 not start , returns exit code=1, however.

am missing out? error message not of help, sadly.

this launch configuration:

-startup plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -vm c:/program files (x86)/java/jdk8_51/bin/javaw.exe --launcher.library plugins/org.eclipse.equinox.launcher.win32.win32.x86_64_1.1.300.v20150602-1417 -product org.eclipse.epp.package.jee.product --launcher.defaultaction openfile --launcher.xxmaxpermsize 256m -showsplash org.eclipse.platform --launcher.xxmaxpermsize 256m --launcher.defaultaction openfile --launcher.appendvmargs -vmargs -xmn128m -xss2m -dosgi.requiredjavaversion=1.7 -xms1024m -xmx1024m 

edit: eclipse error log:

http://postimg.org/image/7iugfivub/

your jdk should 64 bit. download windows x64 version: http://www.oracle.com/technetwork/java/javase/downloads/jdk8-downloads-2133151.html

and point '-vm' it.