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Java.NET

Attempt to provide unopinionated aid in language transition between one and the other. Using clean architecture and design patterns, such as Pipeline, IOC, Mediator and CQRS. Domain and test driven.

Scafolding project serving SPA(Angular or React) over HTTP2

https://docs.microsoft.com/en-us/dotnet/core/
https://github.com/jbogard/MediatR

Run

./gradlew Run

screenshotRun point your browser to

https://localhost:8080
https://localhost

Up when

docker service ls
all services has at least 1 Replica

For available tasks

./gradlew tasks

Stack & tools

Java13, .NETcore3 C#8, Angular8, React16, Gradle6, Docker3, Jetty9, Redis5, RabbitMQ3, Tinkerpop3, Alpine3, Visual Studio Code & extensions

Features

  • Build .NET, Java and stack using Gradle
  • Http2 with TLS
  • serviceloader(java)
  • redis cache
  • rabbit messaging
  • separate domain logic providers to handlers, querys, commands and notifications

Java and .NET Core (c#) project side by side

Java App start the .NET Core way

Program.java

public class Program {
    public static void main(String[] args) {
        App.Run(new Startup());
    }
}

Startup.java

public class Startup {
    public void ConfigureServices(IServiceCollection.Builder services) {
       services
            .AddSingleton(IMessageService.class, EmailService.class)
            .AddSingleton(IShortMessageService.class, SmsService.class)
            
            .AddController("/weatherforecast", WeatherForecastController.class)
            .AddController("/feature", FeatureController.class)
            .AddController("/hello", HelloController.class)

            .AddEmail()
            .AddSms();
    }
    public void Configure(IApplication.Builder app){
        app.UseEmail();
        app.UseSms();
    }
}

screenshot

IDE

with VS code, hit F5

OR

Run .NET

./gradlew DotnetRun (dotnet run)

Run Java

./gradlew run

Docker hints

stack

(docker swarm - docker swarm init)

docker-compose -f stack.docker.yml build
docker stack deploy -c stack.docker.yml app
docker service ls

point your browser to
https://localhost:8080
https://localhost

check

  • docker service ls
  • docker service logs -f app_dotnet
  • docker service logs -f app_java
  • docker service ps app_java --no-trunc
  • docker service inspect app_java
  • docker run -it --entrypoint /bin/bash $IMAGE_NAME -s

build & run

  • docker build -t javanetapp -f docker/java.Dockerfile .
  • docker build -t dotnetapp -f docker/dotnet.Dockerfile .
  • docker run -it --rm --name javanetapp -p 8080:8080 javanetapp
  • docker run -it --rm --name dotnetapp -p 80:80 -p 443:443 dotnetapp

Option

Run Angular/Frontend separatly

cd ClientApp
ng serve

Run Java server with Jetty

docker run --name jetty --rm -v war:/var/lib/jetty -v [local path to wars]:/myvol vol -it -p 80:8080 jetty:9-jre11
cp /myvol/webapps/*.war webapps
point your browser to
http://localhost/app-1.0/hello

Gradle

./gradlew install
build/install/Java.NETcore/bin/Java.NETcore

scale up stacked container

docker service update --replicas 2 app_redis

Cleanup

docker stack rm app
docker system prune

TLS

Caution here !!! with your certificates and private keys even in development mode

Java

Generate private server self-signed root certificate

[java]/bin/keytool -genkey
-alias myPrivateServer
-keyalg EC
-keypass changeit
-storepass changeit
-validity 30
-dname "CN=PrivateServer, OU=Unknown, O=Unknown, L=Unknown, ST=Unknown, C=Unknown"
-ext san=dns:localhost,dns:Anders-Mac.local,ip:127.0.0.1,ip:::1
-storetype PKCS12
-keystore myPrivateServerCert.pfx

Export public server certificate

[java]/bin/keytool -export
-alias myPrivateServer
-storepass changeit
-storetype PKCS12
-keystore myPrivateServerCert.pfx
-file myPublicServer.cer

Add public server certificate to client truststore

[java]/bin/keytool -import -v -trustcacerts
-alias publicClient
-file myPublicClient.cer
-keypass changeit
-storepass changeit
-storetype PKCS12
-keystore clienttruststore.pfx

Option

Add to Mac or where you run request (browser)

drag myPrivateServerCert.pfx to login keychain
For Certificate in login keychain, setup Trust for SSL
add publicClient certificate to request or in code setNeedClientAuth(false)

Check

[java]/bin/keytool -printcert -file myPublicServer.cer
[java]/bin/keytool -list -v -keystore myPrivateServerCert.pfx

Java code check certificate (X509) for expiry date

var cer = (X509Certificate) CertificateFactory.getInstance("X.509").generateCertificate(new FileInputStream ("myPublicServer.cer"));
var expDate = cer.getNotAfter()

.NET

Export developer certificate

dotnet dev-certs https -ep myPrivateServerCert.pfx -p changeit

Trust developer certificate

dotnet dev-certs https --trust

.NET code check certificate (X509) for expiry date

var cert = X509Certificate.CreateFromCertFile("myPublicServer.cer");
var expDate = cert.GetExpirationDateString();

Cleanup

remove certificate from keychain
./gradlew StackStop
./gradlew DockerClean
rm myPrivateServerCert.pfx myPublicServer.cer clienttruststore.pfx