Tips for maintaining consistency between server-side Java and client-side JS DTO properties

Greetings, I am in search of a solution or plugin within Eclipse that can ensure synchronization between server-side Java DTO properties and their corresponding client-side JSON elements as the codebase evolves. For instance, in a web application with a Java backend utilizing REST APIs (using Jackson), the server may have a structure like this:

The DTO:

public class Person {
    private String firstName;
    private String lastName;
    public Person(String string, String string2) {
        firstName = string; lastName = string2;
    }
    public String getFirstName() {
        return firstName;
    }
    public void setFirstName(String firstName) {
        this.firstName = firstName;
    }
    public String getLastName() {
        return lastName;
    }
    public void setLastName(String lastName) {
        this.lastName = lastName;
    }
}

The REST Service:

@Path("/data")
public class PersonService {
    @GET
    @Path("persons")
    @Produces(MediaType.APPLICATION_JSON)
    public List<Person> getAssets() {
        List<Person> persons = new ArrayList<Person>();
        persons.add(new Person("Jimmy", "Hendrix"));
        persons.add(new Person("Roger", "Waters"));
        return persons;
    }
}

On the Client side, using Javascript/JQuery, one might employ code similar to this:

$.ajax('/data/persons/', function(data){
            for(var i = 0; i < data.length; i++){
                var firstName = data[i].firstName;
                var lastName = data[i].lastName;
                //perform actions to present person data on the view
            }
        });

While setting up this workflow is straightforward, managing changes in field names like changing from “firstName” and “lastName” to “foreName” and “surName” can become challenging. In Eclipse, refactoring Java code is simple with the Refactor feature which updates all references appropriately. However, manually adjusting JavaScript references can be time-consuming and error-prone. Is there a tool or plugin available that can automate such changes across both Java and JavaScript code seamlessly?

Answer №1

I can totally relate to that. It's like a never-ending cycle with every job I've had.

In the past, my approach was to create Javascript stubs based on the java DTOs and annotated them with JsDoc to track their usage.

If I were to tackle the same issue now, I might explore what Swagger codegen has to offer straight out of the box.

At least in Intellij, missing fields in the javascript are flagged for easy identification.

While having a plugin would be ideal, having this feature is definitely better than nothing at all.

Using typescript would also provide added compile safety when working with these stubs.

Answer №2

It may be challenging to create a tool for the JavaScript snippet provided in the question.

However, there are steps you can take to enhance the situation.

One approach is to develop a generator for JavaScript representations of your DTOs. A beneficial strategy would be to generate objects with default property values. For example:

var Person = { firstName: "", lastName: "", roles:[] };

Even if not directly implemented in the web UI, this can help minimize typographical errors by prompting warnings from the IDE.

Alternatively, utilizing a genuine JavaScript model layer allows for validation of all DTO JavaScript representations during automated testing or through a dedicated button in the UI maintenance section that QA checks before release. This aids in identifying any missed refactoring remaining when updating the web UI alongside the server.

The validation endpoint could receive a JSON object like:

{ "Person": {...}, "Address": {...}, "Item": {...}, ... }

This could then be cross-referenced with package(s) containing DTOs using Java reflection for validation. Alternatively, leveraging the Nashorn engine in Java enables direct validation on the server, such as during start-up.

While not foolproof, these approaches significantly reduce errors. Simplifying UI logic makes refactorings easier. Utilize generic components connected to DTOs through a minimal translation layer employing label look-up tables which can also undergo validation. This setup additionally aids in internationalization efforts.

Generation and validation can operate independently or together within a project.

Incidentally, GWT was favored in the past for achieving similar objectives. While its current status is uncertain, it likely still offers benefits worthwhile considering.

Answer №3

Experience a new world of programming where the absence of plugins is embraced, entering into the realm of dynamically typed languages.

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