What happened:
当java端的Date是null，go端decode将会报错，如果使用*time.Time可ui接收null，但是将无法接收正常Date
What you expected to happen:
抛出的异常：
ERROR getty@v1.0.7/session.go:558 [session.handlePackage] error:decObject illegal object type tag:74 github.com/dubbogo/hessian2.(*Decoder).decObject
How to reproduce it (as minimally and precisely as possible):
go 作为 client 端，java作为server端，使用dubbogo框架进行调用

Anything else we need to know?: