如何修复此错误“XYZ 没有无参数构造函数”

Question

I am trying to write a web service that listens for SPML requests. I am using the spml version 2 toolkit.

I am using Jdeveloper to create this web serivce.

I create a method like this: public Response execute(Request req)

When I try and create a web service with jdeveloper...I get the following error:

ExecutionMode does not have a no-arg constructor.

Does anybody know how to fix this..?? An example of this would be greatly appreciated.

Thanks, Brian

Answer 1

You need to add a default (no-arg) constructor to the ExecutionMode class.

public class ExecutionMode {
     public ExecutionMode() {
          // initialization code here
     }

     // other class code    

}

Answer 2

Presumably you have a class called ExecutionMode? The compiler is looking for a no argument constructor, ie. a constructor that takes no arguments:

class ExecutionMode{
    ....
    public ExecutionMode(){...}
    ....
}

Answer 3

If you define a parameterized contructor then you should also define a default constructor if you use one because java wont provide default constructor if you define parameterized constructor.So you should define

public ExecutionMode()
{

   //defination

}