Question

I am having a runtime error on setid method saying ” The method ids(List) in the type dtoClass is not applicable for the arguments (boolean) “. below is the code. What error it could be

JSONArray jsonInnerArray = null;
jsonInnerArray = jsonObj.getJSONArray("ids");
List<String> ids = new ArrayList<String>();    
dtoClass.setid(ids.add(jsonInnerArray.get(i).toString()));

DTO Class

public class dtoClass{
private List<String> ids = null;

public List<String> getids() {
    return tracking_ids;
}
public void setids(List<String> ids) {
    this.ids = ids;
}
}

Answer 1

That’s because ids.add returns a boolean. See javadoc for List.add

To solve the issue change the code to:

JSONArray jsonInnerArray = null;
jsonInnerArray = jsonObj.getJSONArray("ids");
List<String> ids = new ArrayList<String>();    
ids.add(jsonInnerArray.get(i).toString())
dtoClass.setid(ids);