hattery VS JHipster

While I think there's a lot to love about Java, I think the standard library itself is not an especially great role model. Most of it was written a long time ago and has a fairly antiquated style - lots of mutable state, nullability, and checked exceptions. Not that the library isn't an incredible asset - it's luxuriously rich compared to working in Node.js - but if it were written from scratch today, I suspect it would look fairly different. Eg, the collection classes would use Optional and have separate read/write interfaces.

For an example of "modern Java" I would point at something like this (which I wrote, sorry about the hubris):

https://github.com/stickfigure/hattery

I have been thinking of writing up a series of articles on this. Without going into too much detail:

* IDEA

* Deploy on Google App Engine, Digital Ocean App Platform, Heroku, Elastic Beanstalk, etc - get out of the ops business entirely.

* Guice as the backbone, no Spring/Boot. I wrote a tiny dropwiard-like "framework" to make this easier: https://github.com/gwizard/gwizard but there's a laughable amount of code here, you could build it all from scratch with minimal effort. This is about as lightweight as "frameworks" get because Guice does the heavy lifting.

* JAX-RS (Resteasy) for the web API. IMO this is the best part of Java web development. HTTP endpoints are simple synchronous Java methods (with a few annotations) and you can test them like simple Java methods.

* Lombok. Use @Value heavily. Cuts most of the boilerplate out of Java.

* Junit5 + AssertJ. (Or Google Truth, which is almost identical to AssertJ).

* Use functional patterns. Try to make all variables and fields final. Use collections streams heavily. Consider vavr.io (I'll admit I haven't it in anger yet, but I would in a new codebase).

* StreamEx. Adds a ton of useful stream behavior; I don't even use basic streams anymore.

* Guava. There's just a lot of useful stuff here.

* For the database, it really depends on what you're building. Most generic business apps, postgres/hibernate/guice-persist/flyway. Yeah, folks complain about hibernate a lot but it's a decent way to map to objects. Use SQL/native queries, don't bother with JPQL, criteria queries, etc.

* Hattery for making http requests (https://github.com/stickfigure/hattery). This is another one of mine. I make zillions of http requests, functional/immutable ergonomics really matter to me.

* Github actions for CI.

* Maven for the build. Yes, it's terrible, except for every other build system is worse. Gradle seems like it should be better but isn't. I'd really love some innovation here. Sigh.

I can't stand most http libraries (full of mutable state!) and I spend a lot of time making http calls. So I built a functional/immutable http request library which has been dramatically improving my personal quality of life for about 7 years now. No idea if anyone else uses it, but it doesn't really matter.

Java version: https://github.com/stickfigure/hattery

Typescript version: https://github.com/stickfigure/hatteryjs

An easy way to get a pre-configured Keycloak instance is to use JHipster's jhipster-sample-app-oauth2 application. It gets updated with every JHipster release. You can clone it with the following command:

provider "auth0" { domain = "https://" debug = false } # Create a new Auth0 application for the JHipster app resource "auth0_client" "java_ms_client" { name = "JavaMicroservices" description = "Java Microservices Client Created Through Terraform" app_type = "regular_web" callbacks = ["http://localhost:8080/login/oauth2/code/oidc"] allowed_logout_urls = ["http://localhost:8080"] oidc_conformant = true jwt_configuration { alg = "RS256" } } # Configuring client_secret_post as an authentication method. resource "auth0_client_credentials" "java_ms_client_creds" { client_id = auth0_client.java_ms_client.id authentication_method = "client_secret_post" } # Create roles for the JHipster app resource "auth0_role" "admin" { name = "ROLE_ADMIN" description = "Administrator" } resource "auth0_role" "user" { name = "ROLE_USER" description = "User" } # Create an action to customize the authentication flow to add the roles and the username to the access token claims expected by JHipster applications. resource "auth0_action" "jhipster_action" { name = "jhipster_roles_claim" runtime = "node18" deploy = true code = <<-EOT /** * Handler that will be called during the execution of a PostLogin flow. * * @param {Event} event - Details about the user and the context in which they are logging in. * @param {PostLoginAPI} api - Interface whose methods can be used to change the behavior of the login. */ exports.onExecutePostLogin = async (event, api) => { const namespace = 'https://www.jhipster.tech'; if (event.authorization) { api.idToken.setCustomClaim(namespace + '/roles', event.authorization.roles); api.accessToken.setCustomClaim(namespace + '/roles', event.authorization.roles); } }; EOT supported_triggers { id = "post-login" version = "v3" } } # Attach the action to the login flow resource "auth0_trigger_actions" "login_flow" { trigger = "post-login" actions { id = auth0_action.jhipster_action.id display_name = auth0_action.jhipster_action.name } } # Create a test user. You can create more users here if needed resource "auth0_user" "test_user" { connection_name = "Username-Password-Authentication" name = "Jane Doe" email = "[email protected]" email_verified = true password = "passpass$12$12" # Don't set passwords like this in production! Use env variables instead. lifecycle { ignore_changes = [roles] } } resource "auth0_user_roles" "test_user_roles" { user_id = auth0_user.test_user.id roles = [auth0_role.admin.id, auth0_role.user.id] } output "auth0_webapp_client_id" { description = "Auth0 JavaMicroservices Client ID" value = auth0_client.java_ms_client.client_id } output "auth0_webapp_client_secret" { description = "Auth0 JavaMicroservices Client Secret" value = auth0_client_credentials.java_ms_client_creds.client_secret sensitive = true }

If you want a Spring backend with an Angular Frontend check out https://www.jhipster.tech. This is very nice for CRUD stuff.

Use https://www.jhipster.tech/

To test GitHub Actions, we need a new project which in this case I generated using JHipster with the configuration seen here:

exports.onExecutePostLogin = async (event, api) => { const namespace = 'https://www.jhipster.tech'; if (event.authorization) { api.idToken.setCustomClaim('preferred_username', event.user.email); api.idToken.setCustomClaim(`${namespace}/roles`, event.authorization.roles); api.accessToken.setCustomClaim(`${namespace}/roles`, event.authorization.roles); } }

What you maybe asking for is something like vaadin or jhipster which marries the front with the backend. (I don't like them tbh but it worth mentioning)

You can try this stack https://www.jhipster.tech with generator for mobile app https://github.com/jhipster/generator-jhipster-ionic.