Passing ArrayList in Web Service Call in Java

Question

I have an ArrayList containing 10 values.

ArrayList<String> a=new ArrayList<String>();
a.add("a1");
a.add("a2");
a.add("a3");

I am invoking WebService to pass this ArrayList as an input parameter.. However when I created a dummy client and tested for the ArrayList I am not getting the output.. I am using Apache Axis 2. I realised that ArrayList is not synchornized and hence there may be a problem...How do I overcome this issue.... I am looking for the simplest solution... Can anyone please guide me...

The server side code is:-

public class TestWebSerrviceForArrayList
{

    public String personIdentity="RandomName";
    ArrayList<String> personArray=new ArrayList<String>();

    public ArrayList<String> addValuesArrayList()
    {
        personArray.add("Name1");
        personArray.add("Name2");
        personArray.add("Name3");
        personArray.add("Name4");
        System.out.println("Added values in person Array   "   +  personArray);
        return personArray;

    }

    public String getName()
    {
        return personIdentity;
    }

}

The code snippet for Client Side is :-

TestWebSerrviceForArrayListStub testWeb=new TestWebSerrviceForArrayListStub();
AddValuesArrayListResponse r=testWeb.(I AM NOT ABLE TO FIND THE FUNCTION NAME)

are you passing arraylist as object/single parameter to Web service? — Dinesh Prajapati
– Dinesh Prajapati, Commented Nov 7, 2011 at 7:05
@ankit Can you please post your client code you are using to call the service? As The Elite Gentleman said, JAX-RS spec supports List<> and not ArrayList<> — zengr
– zengr, Commented Nov 7, 2011 at 7:13
I have a function which return ArrayList<string>..This ArrayList contains many values..At client side I will staright away create a Response and get the value..However it is not happening. — AngelsandDemons
– AngelsandDemons, Commented Nov 7, 2011 at 9:15
If I convert return type to Array<String> it works perfectly fine... — AngelsandDemons
– AngelsandDemons, Commented Nov 7, 2011 at 9:38

Buhake Sindi · Accepted Answer · 2011-11-07 09:40:15Z

1

ArrayList is not understood by the Web Service, but List is. It's got nothing to do with synchronization of ArrayList but to match the data types understood by the WSDL.

As stated earlier: I would change the return type for this method to List<String> as follows (and regenerate the WSDL).

public List<String> addValuesArrayList()
    {
        personArray.add("Name1");
        personArray.add("Name2");
        personArray.add("Name3");
        personArray.add("Name4");
        System.out.println("Added values in person Array   "   +  personArray);
        return personArray;

    }

edited Nov 7, 2011 at 9:40

answered Nov 7, 2011 at 7:06

Buhake Sindi

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2 Comments

AngelsandDemons Over a year ago

Is it that ArrayList is not serialized..I stumbled across something like that however I cannot exactly recall what it is...My bad...

Buhake Sindi Over a year ago

ArrayList is Serializable by default. I still don't understand your comment.

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