Question

I am using Jersey to parse the following JSON:

{"response":{"status":"OK","campaigns":[{"id":12345,"state":"active","code":null}]}}

But I get the following error message:

java.lang.IllegalArgumentException: No more parsing elements.

If I switch the position of the fields code and state so that the resulting JSON looks like

{"response":{"status":"OK","campaigns":[{"id":12345,"code":null,"state":"active"}]}}

everything works fine. Also if I change the code-field in the first JSON to a non-null value like "code":"test", Jersey can parse this without any problems. I tried other more complex examples always getting the above mentioned error message when leaving the last field of any element of an array null.

I think I am doing something wrong, because I could not find any others having the similar problem. I already tried to implement a CustomJAXBContextResolver using other JSON notations like natural but nothing worked for me.

Any ideas?

---

Here are my binding classes:

@XmlRootElement
public class LoadEntityResponse {

public LoadEntityResponse() {
}

private Response response;

public Response getResponse() {
    return response;
}

public void setResponse(Response response) {
    this.response = response;
}
}

and

public class Response {

public Response() {
}

private String status;
private String error;
private String error_id;

private Campaign[] campaigns;

public String getStatus() {
    return status;
}

public void setStatus(String status) {
    this.status = status;
}

public String getError() {
    return error;
}

public void setError(String error) {
    this.error = error;
}

public String getError_id() {
    return error_id;
}

public void setError_id(String error_id) {
    this.error_id = error_id;
}

public Campaign[] getCampaigns() {
    return campaigns;
}

public void setCampaigns(Campaign[] campaigns) {
    this.campaigns = campaigns;
}
}

and finally

public class Campaign{
public Campaign() {
}

protected int id;
protected String code;
protected String state;

public int getId() {
    return id;
}

public void setId(int id) {
    this.id = id;
}

public String getCode() {
    return code;
}

public void setCode(String code) {
    this.code = code;
}

public String getState() {
    return state;
}

public void setState(String state) {
    this.state = state;
}
}

Solved: Using JacksonJsonProvider now:

...
DefaultClientConfig config = new DefaultClientConfig();
config.getClasses().add(JacksonJsonProvider.class);
...

that´s all!

Answer 1

You can also use Jackson POJO support that comes with jersey-json but there is a need to do some configuration, see POJO support in Jersey User Guide.