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NullValueInNestedPathException

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java - org.springframework.beans.NullValueInNestedPathException : auto-grow nested property path in Spring MVC 3. 2.8

我有一个基于SpringWeb模型-View-Controller(MVC)框架的项目。SpringWeb模型-View-Controller(MVC)框架的版本是3.2.8。这门课publicclassDeviceForm{Devicedevice;ListselectedItems=Collections.emptyList();publicDeviceForm(){super();}publicDevicegetDevice(){returndevice;}publicvoidsetDevice(Devicedevice){this.device=device;}publicLi