Fix NullPointerException when Hessian instantiate URL with JavaDeserializer #3342

[qq925716471]

What is the purpose of the change

fix #3342

Brief changelog

XXXXX

Verifying this change

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[carryxyh]

Why close this pull request?

[qq925716471]

wrong operation

[carryxyh]

Hi, I saw that u open another pr.
U can use "reopen" for next time.
Never mind, I will deal your new pull request.