How can I create Java web service (jax-ws) with array or List as a parameter

Question

I've got a problem with a web service which has an array or List as parameter. Here is example:

@WebMethod
public String printList(@WebParam(name = "list") List<String> list) {
    String result = "";
    if(list == null) {
        result = "list is null";
    } else if(list.size() == 0) {
        result = "list is empty";
    } else {
        for(String elem : list) {
            result += elem + " ";
        }
    }
    return result;
}

When I call printList from web service client the result is always "list is empty" The same is when I use array of String. Should I use some additional annotations or something?

Jigar Joshi · Accepted Answer · 2010-12-09 10:02:19Z

2

Your code is perfect, it seems you are calling it wrong way,

and you can remove second condition directly second else will work

answered Dec 9, 2010 at 10:02

Jigar Joshi

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3 Comments

Pawel Over a year ago

Thank you for your answer. If I call some other method of the same web service which for example take one String parameter everything works perfectly - passed String (or long, int or whatever) argument is not null nor empty. So I think I call it correctly. Is there a pssibility that I do something wrong in generating web service?

Jigar Joshi Over a year ago

@Pawel try using SOAP ui once. It seems perfect from server end

Pawel Over a year ago

life.java It works with soapui - you are right it must be something at the client side. Thanks!

E_X · Accepted Answer · 2013-11-27 17:53:25Z

-1

The array datatype in a JAX Webservice is not supportive, so you need to use libraries and tools for such a thing...

answered Nov 27, 2013 at 17:53

E_X

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1 Comment

gouessej Over a year ago

The arrays are supported both as a return type and as a web parameter's type when you declare them in your web services but such a web parameter is received as a java.util.List on the client side and the return type becomes YourPrettyObjectArray, calling YourPrettyObjectArray.getItem() returns a java.util.List.

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