In the case of nstalling 7u21 after removing jre 8, javaws -uninstall will give the error message "Error encountered while invoking Java Web Start (execv)....." *** Tested Configurations: - x86 Vista, Win 7 - jre 8-b80, jre 7u21-b06 *** Steps to reproduce: 0) Uninstall all JREs and clean up all related java registries 1) Install latest promoted jre 8-b80 2) Uninstall jre8-b80 3) Install latest promoted 7u21-b06 4) From the command line, invoke javaws -uninstall If you see the error message as attached screenshot, the issue is reproducible
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