Javalin 0.4.0 released

CORS

Javalin 0.4.0 adds built-in CORS support with app.enableCorsForOrigin("origin"). There were also some breaking changes made to Jackson and the template-engines. If you want to configure Jackson now, you’ll have to call JavalinJacksonPlugin.configure() instead of just Jackson.configure().

0.3.0 to 0.4.0 recap

• Added simple file-upload api:

  app.post("/upload") { ctx ->
    ctx.uploadedFiles("files").forEach { (contentType, content, name, extension) ->
        FileUtils.copyInputStreamToFile(content, File("upload/" + name))
    }
  }
  

• Added ctx.mapQueryParams() and ctx.mapFormParams(), which adds neat destructuring in Kotlin:

  app.post("/new-user") { ctx ->
    val (name, email) = ctx.mapFormParams("name", "email") ?: throw MissingFormParamException()
  }
  

• Added ctx.anyQueryParamNull() and ctx.anyFormParamNull() for Java devs who can’t destructure
• Added option to declare routes without paths, relying on the path() method:

  app.routes {
    path("users") {
        get(userController::getAllUsers);
        post(userController::createUser);
        path(":id") {
            get(userController::getUser);
            patch(userController::updateUser);
            delete(userController::deleteUser);
        }
    }
  }
  

• Added support for external static files via app.enableStaticFiles("/folder", Location.EXTERNAL)
• app.start() and app.stop() are now synchronous methods (app.awaitStart() and app.awaitStop() have been removed)
• Added @JvmStatic annotations, so INSTANCE can be omitted when calling configuration-methods from Java
• Added option to dontIgnoreTrailingSlashes()
• Added some convenience methods and overloads (like start(port) and render(templatePath))

There were also other minor adjustments and bugfixes, see the news overview for a complete list.