Using Spring as a dependency injection framework with play 2.4.x?

Question

I am exploring play-scala 2.4.2 and trying to get the spring DI working with it. I see there are a lot of changes in play 2.4.x and old way of overriding the GlobalSettings.getC

Answer 1

Please follow the following steps:

Step1: Add the spring dependencies in build.sbt file.

libraryDependencies += "org.springframework" % "spring-context" % "4.1.6.RELEASE"
libraryDependencies += "org.springframework" % "spring-core" % "4.1.6.RELEASE"
libraryDependencies += "org.springframework" % "spring-beans" % "4.1.6.RELEASE"
libraryDependencies += "org.springframework" % "spring-aop" % "4.1.6.RELEASE"

Step2: Create a new class (ApplicationGlobalSettings.java) and that implements with GlobalSettings class.

package com.ranga.global.settings;

import org.springframework.context.ConfigurableApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import play.Application;
import play.GlobalSettings;
public class ApplicationGlobalSettings extends GlobalSettings { 


private static final String APPLICATION_CONTEXT_XML = "applicationContext.xml";
private ConfigurableApplicationContext applicationContext;

@Override
public void beforeStart(Application application) {      
    super.beforeStart(application);
}

@Override
public void onStart(Application application) {      
    super.onStart(application);     
    applicationContext = new ClassPathXmlApplicationContext(APPLICATION_CONTEXT_XML);           
}

@Override
public void onStop(Application application) {       
    super.onStop(application);
    if(applicationContext != null) {
        applicationContext.close();
    }
}

}

Step3: Create a new spring configuration file under conf folder (applicationContext.xml) conf\applicationContext.xml

Step4: Add the newly created GlobalSettings file location to the application configuration file (conf/application.conf).

.....some more configuration here.....
# Global Objects class
application.global=com.ranga.global.settings.ApplicationGlobalSettings

Step5: Create a new service class under com.ranga.service package (HelloWorldService.java).

package com.ranga.services;
import javax.inject.Inject;
import org.springframework.stereotype.Service;

import com.ranga.daos.HelloWorldDAO;
@Service
public class HelloWorldService {

    @Inject
    private HelloWorldDAO helloWorldDAO;

    public String sayHello() {
        return helloWorldDAO.sayHello();
    }
}

Step6: Create a new dao class under com.ranga.daos package (HelloWorldDAO.java).

package com.ranga.daos;

import org.springframework.stereotype.Repository;
@Repository
public class HelloWorldDAO {
    public String sayHello() {
        return "Hello Ranga!";
    }
}

Step7: Finally inject the HelloWorldService in Application.java file.

package com.ranga.controllers;

import javax.inject.Inject;

import org.springframework.beans.factory.annotation.Autowired;

import com.ranga.services.HelloWorldService;

import play.*;
import play.mvc.*;

import views.html.*;

public class Application extends Controller {

    @Inject
    private HelloWorldService helloWorldService;

    public Result index() {         
        return ok(index.render(helloWorldService.sayHello()));
    }
}

Step8: Finally modify the index.scala.html file code.

@(message: String)

@message

Now done.. run the application.