You must completely uninstall Java SE 7/7.1 offerings from your environment and ensure all server profiles are pointed to IBM SDK, Java Technology Edition, Version 8 before executing the upgrade.
Note: Raw links expire every 24 hours. Use the IBM Support Assistant (ISA) tool for scripted downloads. ibm websphere application server 8.5.5.22 download
This is the most critical part of this review. You must completely uninstall Java SE 7/7