Agent Skills: JWebMP Vert.x

JWebMP Vert.x

Portable connector between JWebMP and Vert.x 5, powered by GuicedEE.

Core Features

• Automatic Page Routing — @PageConfiguration classes auto-registered
• AJAX Event Pipeline — Fully reactive request handling
• Data Component Servlet — Serves IDataComponent as JSON
• CSS Endpoint — On-demand CSS rendering
• Site-Loader Script — JS bootstrap template
• WebSocket Broadcasting — Event bus bridge (direct or STOMP)
• User-Agent Detection — Per call-scope via UADetector
• Call-Scope Integration — Every handler enters CallScope

Quick Start

1. Annotate a Page

@PageConfiguration(url = "/")
public class HomePage extends Page<HomePage> { }

2. Start GuicedEE

IGuiceContext.instance().inject();
// Routes registered automatically

3. Routes Created

• GET / — serves HomePage
• GET /jwscr — site-loader script
• POST /jwajax — AJAX event receiver
• GET /jwdata — data component endpoint
• GET /jwcss — CSS endpoint

HTTP Routes

| Route | Method | Handler | Purpose | |---|---|---|---| | @PageConfiguration.url() | GET | configurePageServlet | Renders annotated IPage as HTML | | /jwajax | POST | configureAjaxReceiveServlet | Processes AJAX event calls | | /jwdata | GET | configureDataServlet | Serves IDataComponent JSON | | /jwcss | GET | configureCSSServlet | Renders page-level CSS | | /jwscr | GET | configureInternalDataServlet | Serves site-loader JS |

Request Lifecycle

HTTP Request
 └─ Vert.x Router
     └─ Route handler
         └─ CallScope enter
             ├─ CallScopeProperties populated
             │  ├─ RoutingContext
             │  ├─ HttpServerRequest
             │  ├─ HttpServerResponse
             │  └─ Stream ID
             ├─ Handler logic (render/AJAX/data/CSS/script)
             └─ CallScope exit

AJAX Flow (Reactive)

POST /jwajax
 └─ bodyHandler (event loop)
     ├─ Deserialize AjaxCall from JSON
     ├─ Resolve event class → IEvent
     ├─ Run AjaxCallInterceptors
     └─ triggerEvent.fireEvent(call, response) → Uni
         ├─ onItem  → write JSON response
         └─ onFailure → structured error JSON

AJAX Example

public class ButtonClickEvent extends OnClickAdapter {
    @Override
    public void onClick(AjaxCall<?> call, AjaxResponse<?> response) {
        // Process event
        String param = call.getParameters().get("key");

        // Update DOM
        response.addComponent(new Div<>().setText("Result: " + param));
    }
}

WebSocket Broadcasting

Two IGuicedWebSocket implementations:

Direct Event Bus

public class VertXEventBusBridgeIWebSocket implements IGuicedWebSocket {
    @Override
    public void broadcastMessage(String groupName, Object message) {
        vertx.eventBus().publish(groupName, message);
    }
}

STOMP Event Bus (Default)

public class VertXStompEventBusBridgeIWebSocket implements IGuicedWebSocket {
    @Override
    public void broadcastMessage(String groupName, Object message) {
        vertx.eventBus().publish("/toStomp/" + groupName, message);
    }
}

Bound by default in JWebMPVertxBinder.

User-Agent Detection

Call-scoped ReadableUserAgent:

@Inject
private ReadableUserAgent userAgent;

public void process() {
    String browser = userAgent.getName();
    String version = userAgent.getVersionNumber().toVersionString();
    String os = userAgent.getOperatingSystem().getName();
}

Data Components

Serve dynamic data as JSON:

public class UserDataComponent implements IDataComponent {
    @Override
    public Object renderData() {
        return userRepository.findAll();
    }
}

Access via: GET /jwdata?component=UserDataComponent

CSS Endpoint

Render page-level CSS on demand:

@PageConfiguration(url = "/dashboard")
public class DashboardPage extends Page<DashboardPage> {
    public DashboardPage() {
        Div<?, ?, ?> container = new Div<>();
        container.getCss()
                 .getBackground().setBackgroundColor$(ColourNames.AliceBlue);
        getBody().add(container);
    }
}

Access via: GET /jwcss?page=DashboardPage

Site-Loader Script

Template-driven JS bootstrap at /jwscr:

var JW_SERVER_ADDRESS = '${serverAddress}';
var JW_PAGE_CLASS = '${pageClass}';
var JW_USER_AGENT = '${userAgent}';
var JW_REFERRER = '${referrer}';

Configuration

| Environment Variable | Default | Purpose | |---|---|---| | BIND_JW_PAGES | true | Enable/disable automatic page routing |

Disable page binding:

export BIND_JW_PAGES=false

Call-Scope Properties

Every HTTP handler populates:

@Inject
private CallScopeProperties properties;

public void process() {
    RoutingContext ctx = properties.getRoutingContext();
    HttpServerRequest req = properties.getRequest();
    HttpServerResponse res = properties.getResponse();
    String streamId = properties.getStreamId();
}

Jackson Configuration

Vert.x DatabindCodec mapper aligned with GuicedEE:

• Quoted field names
• Single-quote tolerance
• Null handling

Key Classes

• JWebMPVertx — Main module + VertxHttpServerConfigurator
• JWebMPVertxBinder — Binds ReadableUserAgent, IGuicedWebSocket, Jackson config
• ReadableUserAgentProvider — Call-scoped UA parser
• VertXEventBusBridgeIWebSocket — Direct event bus broadcasting
• VertXStompEventBusBridgeIWebSocket — STOMP-prefixed broadcasting

JPMS Module

module com.jwebmp.vertx {
    requires transitive com.jwebmp.client;
    requires transitive com.jwebmp.core;
    requires transitive com.guicedee.vertx.web;
    requires transitive com.guicedee.guicedinjection;
    requires transitive com.guicedee.jsonrepresentation;

    provides IGuiceModule with JWebMPVertx, JWebMPVertxBinder;
    provides VertxHttpServerConfigurator with JWebMPVertx;
}

Installation

<dependency>
  <groupId>com.jwebmp</groupId>
  <artifactId>jwebmp-vertx</artifactId>
</dependency>

Error Handling

InvalidRequestException

Structured error for invalid AJAX requests:

{
  "error": "Invalid request",
  "message": "Component not found",
  "code": 400
}

Generic Errors

{
  "error": "Internal error",
  "message": "Exception details",
  "code": 500
}

Common Patterns

Custom Route

public class CustomConfigurator implements VertxRouterConfigurator {
    @Override
    public void configureVertxRouter(Router router) {
        router.get("/api/custom").handler(ctx -> {
            ctx.response()
               .putHeader("Content-Type", "application/json")
               .end("{\"status\":\"ok\"}");
        });
    }
}

Register via module-info.java:

provides VertxRouterConfigurator with CustomConfigurator;

WebSocket Broadcasting

@Inject
private IGuicedWebSocket webSocket;

public void notifyUsers(String message) {
    webSocket.broadcastMessage("notifications", message);
}

User-Agent Based Logic

@Inject
private ReadableUserAgent userAgent;

public IPage<?> getPage() {
    if (userAgent.getDeviceCategory() == DeviceCategory.SMARTPHONE) {
        return new MobilePage();
    }
    return new DesktopPage();
}

Dependencies

com.jwebmp.vertx
 ├── com.jwebmp.client
 ├── com.jwebmp.core
 ├── com.guicedee.vertx.web
 ├── com.guicedee.guicedinjection
 ├── com.guicedee.jsonrepresentation
 ├── io.vertx.core
 ├── io.vertx.web
 └── net.sf.uadetector.core

References

• Module: com.jwebmp.vertx
• Vert.x: 5.x
• Java: 25+
• License: Apache 2.0