After updating WebSphere 8.5.5 to the use 1.7 JDK the following error appears in native_stderr.log and the server won't start. I presume this option is configured somewhere, but I can't see where.
JVMJ9VM007E Command-line option unrecognised: -Xcheck:dump
After upgrading WebSphere to 8.5.5 fix pack 2 or above, if a server is using Java 7 and the optional Java 7 service release is not also updated (as recommended), WebSphere will fail to start. This is the Known WebSphere Issue. You need to upgrade the IBM Java version of your webSphere server.
Pls look into this Link.