HelloSingleton.java

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package com.acme.ejb.impl;

import javax.annotation.PostConstruct;
import javax.annotation.PreDestroy;
import javax.annotation.Resource;
import javax.ejb.DependsOn;
import javax.ejb.SessionContext;
import javax.ejb.Singleton;
import javax.ejb.Startup;
import javax.inject.Inject;
import javax.persistence.EntityManagerFactory;
import javax.persistence.PersistenceUnit;

import com.acme.ejb.api.Hello;
import com.acme.util.TestDatabase;
import com.acme.util.TestDependentBeanInLib;
import com.acme.util.TestManagedBean;
import com.acme.util.TestSessionScopedBeanInLib;
import com.acme.util.UtilInLibDir;

@Singleton
@Startup
@DependsOn("Singleton4")
public class HelloSingleton implements Hello {

    @Resource
    SessionContext sessionCtx;

    @PersistenceUnit(unitName = "pu1")
    @TestDatabase
    private EntityManagerFactory emf;
    
    @Inject
    TestManagedBean tmb;
    
    @Inject
    TestDependentBeanInLib tdbil;
    
    @Inject
    TestSessionScopedBeanInLib tssil;
    

    @PostConstruct
    private void init() {
        System.out.println("HelloSingleton::init()");

        String appName;
        String moduleName;
        appName = (String) sessionCtx.lookup("java:app/AppName");
        moduleName = (String) sessionCtx.lookup("java:module/ModuleName");
        System.out.println("AppName = " + appName);
        System.out.println("ModuleName = " + moduleName);
    }

    public String hello() {
        System.out.println("HelloSingleton::hello()");
        String res = testEMF();
        if (!res.equals("")) return res;
        res = testInjectionOfBeansInLibDir();
        if (!res.equals("")) return res;
        UtilInLibDir uilb = new UtilInLibDir();
        if (!(uilb.add(1, 2) == 3)) {
            return "Can't use utility class in library directory";
        }
        return ALL_OK_STRING;
    }

    private String testInjectionOfBeansInLibDir() {
        if (tmb == null) return "Injection of Managed Bean in lib into an EJB in that ear failed";
        if (tdbil == null) return "Injection of Dependent Bean in lib into an EJB in that ear failed";
        if (tssil == null) return "Injection of SessionScoped Bean in lib into an EJB in that ear failed";
        return "";
    }

    private String testEMF() {
        if (emf == null) return "EMF injection failed, is null in Singleton EJB";
        if (emf.createEntityManager() == null) return "Usage of EMF failed in Singleton EJB";
        return "";
    }

    @PreDestroy
    private void destroy() {
        System.out.println("HelloSingleton::destroy()");
    }

}