morphia-1.2.9a：由异常InstantiationError引起的意外错误：play.data.binding.BeanWrapper

Question

播放框架+ morphia

请求POST / accountcontroller / signup的内部服务器错误（500）

Oops: InstantiationError
An unexpected error occured caused by exception InstantiationError: play.data.binding.BeanWrapper

play.exceptions.UnexpectedException: Unexpected Error
        at play.mvc.ActionInvoker.invoke(ActionInvoker.java:264)
        at Invocation.HTTP Request(Play!)
Caused by: java.lang.InstantiationError: play.data.binding.BeanWrapper
        at play.modules.morphia.Model.edit(Model.java:101)
        at play.modules.morphia.Model.create(Model.java:87)
        at play.modules.morphia.Model.create(Model.java:79)
        at play.modules.morphia.MorphiaPlugin.bind(MorphiaPlugin.java:727)
        at play.PlayPlugin.bind(PlayPlugin.java:70)
        at play.plugins.PluginCollection.bind(PluginCollection.java:579)
        at play.data.binding.Binder.bind(Binder.java:103)
        at play.mvc.ActionInvoker.getActionMethodArgs(ActionInvoker.java:651)
        at play.mvc.ActionInvoker.invokeControllerMethod(ActionInvoker.java:484)
        at play.mvc.ActionInvoker.invokeControllerMethod(ActionInvoker.java:479)
        at play.mvc.ActionInvoker.invoke(ActionInvoker.java:161)`enter code here`
        ... 1 more`enter code here`