在 controller 中的后续命令对象上初始化命令 object 时出错

Question

I have the defined following controller

class BookController {

  def book(BookCommand bookCommand,
           AnotherBookCommand bookCommand2) 
  {
    ....
  }

When I debugged it, binding is done on the bookCommand and when it's bookCommand2's turn for binding, it throws this exception

Error in object 'bookCommand2': codes []; arguments []; default message [Error occurred initializing command object [bookCommand2]. org.apache.groovy.json.internal.Exceptions$JsonInternalException: Wrapped Exception
 CAUSE java.io.IOException :: Stream closed]

If I try to switch the order of the parameters ie

class BookController {

  def book(AnotherBookCommand bookCommand2,
           BookCommand bookCommand) 
  {
    ....
  }

Binding is done on the bookCommand2 and binding of bookCommand throws the exception.

Error in object 'bookCommand': codes []; arguments []; default message [Error occurred initializing command object [bookCommand]. org.apache.groovy.json.internal.Exceptions$JsonInternalException: Wrapped Exception
 CAUSE java.io.IOException :: Stream closed]

Any idea what's happening here?

Answer 1

We do not support binding the request of the body to multiple command objects. One option you have is to aggregate them into 1 class with something like this:

class SomeClass {
    BookCommand bookCommand
    BookCommand anotherBookCommand
}

Then have your controller action accept one of those and organize the body of the JSON accordingly.