It's difficult to start guessing when you don't give us much information.
Ok, you get an "empty page" when browsing, but what exactly did you do to get there? Is is a completely blank page, or is there some stuff on it (e.g. Jira header but nothing else)? Are other parts of Jira working? What does your log say? What version are you on and what's the browser? Does it work if you use a different browser?
A few questions:
thanks your help very much, I found reason is a plugin just installed . When I uninstall this plugin,it is ok.
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