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     <div id="main-block" class="container main-block">
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             <div class='page-header'>

               <h1>Singleton Startup Ordering</h1>
             </div>
           </div>
         </div>
         <div class="row">

             <div class="col-md-12">
                 <div id="preamble">
 <div class="sectionbody">
 <div class="paragraph">
 <p>This examples shows in practice the  <code>@Startup</code> and <code>@DependsOn</code> annotations on <code>singleton</code> EJB&#8217;s.</p>
 </div>
 </div>
 </div>
 <div class="sect2">
 <h3 id="_run_the_tests">Run the tests</h3>
 <div class="listingblock">
 <div class="content">
 <pre class="highlight"><code class="language-java" data-lang="java">mvn clean test</code></pre>
 </div>
 </div>
 </div>
 <div class="sect2">
 <h3 id="_the_scenario">The scenario</h3>
 <div class="ulist">
 <ul>
 <li>
 <p>The example is composed by three singleton beans: <code>SingletonA</code>, <code>SingletonB</code>, <code>SingletonC</code>.</p>
 </li>
 <li>
 <p>The three EJB&#8217;s contains a <code>@PostConstruct</code> annotation for the <code>init</code> method that is executed after dependency injection is done to perform any initialization. This method is invoked before the class is put into service.</p>
 </li>
 <li>
 <p>The <code>init</code> method store the name of the bean class that is been initialized in the <code>Supervisor</code> bean.</p>
 </li>
 <li>
 <p>The <code>Supervisor</code> bean is annotated with <code>@ApplicationScoped</code> to be able to share the list of bean names stored in the <code>records</code> attribute.</p>
 </li>
 <li>
 <p><code>SingletonA</code> and <code>SingletonB</code> are annotated with <code>@Startup</code> which means they are going to initialized upon application startup.  <code>SingletonC</code> will be initilized until the bean is going to be used in later injection point.</p>
 </li>
 <li>
 <p><code>SingletonB</code> is annotated with <code>@DependsOn("SingletonA")</code> to enforce a initialization order with respect to <code>SingletonA</code>.</p>
 </li>
 </ul>
 </div>
 <div class="paragraph">
 <p><code>SingletonA.java</code>: Singleton EJB annotated with  <code>@Startup</code>. It depends on the EJB <code>Supervisor</code>.</p>
 </div>
 <div class="listingblock">
 <div class="content">
 <pre class="highlight"><code class="language-java" data-lang="java">package org.foo;

 import jakarta.annotation.PostConstruct;
 import jakarta.ejb.Singleton;
 import jakarta.ejb.Startup;
 import jakarta.inject.Inject;
 import java.util.logging.Logger;

 @Singleton
 @Startup
 public class SingletonA {

     @Inject
     Supervisor supervisor;

     private final static Logger LOGGER = Logger.getLogger(SingletonA.class.getName());


     @PostConstruct
     public void init() {
         LOGGER.info("Hi from init in class: " + this.getClass().getName());
         supervisor.addRecord(this.getClass().getSimpleName());
     }
 }</code></pre>
 </div>
 </div>
 <div class="paragraph">
 <p><code>SingletonB.java</code>: Singleton EJB annotated with  <code>@Startup</code> and <code>DependsOn</code>. It depends on the EJB <code>Supervisor</code>.</p>
 </div>
 <div class="listingblock">
 <div class="content">
 <pre class="highlight"><code class="language-java" data-lang="java">package org.foo;

 import jakarta.annotation.PostConstruct;
 import jakarta.ejb.DependsOn;
 import jakarta.ejb.Singleton;
 import jakarta.ejb.Startup;
 import jakarta.inject.Inject;
 import java.util.logging.Logger;

 @Singleton
 @Startup
 @DependsOn("SingletonA")
 public class SingletonB {

     @Inject
     Supervisor supervisor;

     private final static Logger LOGGER = Logger.getLogger(SingletonB.class.getName());

     @PostConstruct
     public void init() {
         LOGGER.info("Hi from init in class: " + this.getClass().getName());
         supervisor.addRecord(this.getClass().getSimpleName());
     }
 }</code></pre>
 </div>
 </div>
 <div class="paragraph">
 <p><code>SingletonC.java</code>: Singleton EJB. It depends on the EJB <code>Supervisor</code>.</p>
 </div>
 <div class="listingblock">
 <div class="content">
 <pre class="highlight"><code class="language-java" data-lang="java">import jakarta.annotation.PostConstruct;
 import jakarta.ejb.Singleton;
 import jakarta.inject.Inject;
 import java.util.logging.Logger;

 @Singleton
 public class SingletonC {
     @Inject
     Supervisor supervisor;

     private final static Logger LOGGER = Logger.getLogger(SingletonC.class.getName());

     @PostConstruct
     public void init() {
         LOGGER.info("Hi from init in class: " + this.getClass().getName());
         supervisor.addRecord(this.getClass().getSimpleName());

     }

     public String hello() {
         return "Hello from SingletonC.class";
     }
 }</code></pre>
 </div>
 </div>
 <div class="paragraph">
 <p><code>Supervisor.java</code>: Applicaiton scoped Bean that keep track of a list of Bean Names.</p>
 </div>
 <div class="listingblock">
 <div class="content">
 <pre class="highlight"><code class="language-java" data-lang="java">import jakarta.enterprise.context.ApplicationScoped;
 import java.util.ArrayList;
 import java.util.List;

 @ApplicationScoped
 public class Supervisor {
     private final List&lt;String&gt; records = new ArrayList&lt;&gt;();

     public void addRecord(String beanClass){
         records.add(beanClass);
     }

     public String getRecord(){
         return records.toString();
     }
 }</code></pre>
 </div>
 </div>
 </div>
 <div class="sect2">
 <h3 id="_the_tests">The tests</h3>
 <div class="ulist">
 <ul>
 <li>
 <p>The class <code>TestSingletonStartupOrder.java</code> contains two test that are executed in order via the annotation <code>@FixMethodOrder(MethodSorters.NAME_ASCENDING)</code></p>
 </li>
 <li>
 <p><code>firstTest</code>: assert true if an only if the records stored in the <code>Supervisor.record</code> are equals to <code>[SingletonA, SingletonB]</code>. Notice that the order is validated too. In this test we don&#8217;t expect to see <code>SingletonC</code> initilized since it&#8217;s not annotated with <code>@Startup</code>.</p>
 </li>
 <li>
 <p><code>secondTest</code>:  This test inject <code>SingletonC</code> as a parameter in the tests, therefore it asserts to true if an only if the records stored in the <code>Supervisor.record</code> are equals to <code>[SingletonA, SingletonB, SingletonC]</code></p>
 </li>
 </ul>
 </div>
 <div class="paragraph">
 <p><code>TestSingletonStartupOrder.java</code></p>
 </div>
 <div class="listingblock">
 <div class="content">
 <pre class="highlight"><code class="language-java" data-lang="java">import org.jboss.arquillian.container.test.api.Deployment;
 import org.jboss.arquillian.junit.Arquillian;
 import org.jboss.shrinkwrap.api.ShrinkWrap;
 import org.jboss.shrinkwrap.api.asset.StringAsset;
 import org.jboss.shrinkwrap.api.spec.WebArchive;
 import org.junit.FixMethodOrder;
 import org.junit.Test;
 import org.junit.runner.RunWith;
 import org.junit.runners.MethodSorters;
 import org.foo.SingletonA;
 import org.foo.SingletonB;
 import org.foo.SingletonC;
 import org.foo.Supervisor;

 import java.util.logging.Logger;

 import static junit.framework.TestCase.assertTrue;


 @RunWith(Arquillian.class)
 @FixMethodOrder(MethodSorters.NAME_ASCENDING)
 public class TestSingletonStartupOrder {
     private final static Logger LOGGER = Logger.getLogger(TestSingletonStartupOrder.class.getName());

     @Deployment()
     public static WebArchive createDeployment() {
         final WebArchive webArchive = ShrinkWrap.create(WebArchive.class, "test.war")
                                                 .addClass(SingletonA.class)
                                                 .addClass(SingletonB.class)
                                                 .addClass(SingletonC.class)
                                                 .addClass(Supervisor.class)
                                                 .addAsWebInfResource(new StringAsset("&lt;beans/&gt;"), "beans.xml");
         return webArchive;
     }


     @Test
     public void firstTest(Supervisor supervisor) {
         LOGGER.info("SUPERVISOR: [" + supervisor.getRecord() + "]");
         assertTrue(supervisor.getRecord().equals("[SingletonA, SingletonB]"));
     }

     @Test
     public void secondTest(Supervisor supervisor, SingletonC singletonC) {
         LOGGER.info(singletonC.hello());
         LOGGER.info("SUPERVISOR: [" + supervisor.getRecord() + "]");
         assertTrue(supervisor.getRecord().equals("[SingletonA, SingletonB, SingletonC]"));
     }
 }</code></pre>
 </div>
 </div>
 </div>
 <div class="sect2">
 <h3 id="_about_the_test_architecture">About the Test architecture</h3>
 <div class="paragraph">
 <p>The test cases from this project are built using Arquillian and TomEE
 Remote. The arquillian configuration can be found in
 <code>src/test/resources/arquillian.xml</code></p>
 </div>
 </div>
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	<div id="main-block" class="container main-block">
	<div class="row title">
	<div class="col-md-12">
	<div class='page-header'>

	<h1>Singleton Startup Ordering</h1>
	</div>
	</div>
	</div>
	<div class="row">

	<div class="col-md-12">
	<div id="preamble">
	<div class="sectionbody">
	<div class="paragraph">
	<p>This examples shows in practice the <code>@Startup</code> and <code>@DependsOn</code> annotations on <code>singleton</code> EJB’s.</p>
	</div>
	</div>
	</div>
	<div class="sect2">
	<h3 id="_run_the_tests">Run the tests</h3>
	<div class="listingblock">
	<div class="content">
	<pre class="highlight"><code class="language-java" data-lang="java">mvn clean test</code></pre>
	</div>
	</div>
	</div>
	<div class="sect2">
	<h3 id="_the_scenario">The scenario</h3>
	<div class="ulist">
	<ul>
	<li>
	<p>The example is composed by three singleton beans: <code>SingletonA</code>, <code>SingletonB</code>, <code>SingletonC</code>.</p>
	</li>
	<li>
	<p>The three EJB’s contains a <code>@PostConstruct</code> annotation for the <code>init</code> method that is executed after dependency injection is done to perform any initialization. This method is invoked before the class is put into service.</p>
	</li>
	<li>
	<p>The <code>init</code> method store the name of the bean class that is been initialized in the <code>Supervisor</code> bean.</p>
	</li>
	<li>
	<p>The <code>Supervisor</code> bean is annotated with <code>@ApplicationScoped</code> to be able to share the list of bean names stored in the <code>records</code> attribute.</p>
	</li>
	<li>
	<p><code>SingletonA</code> and <code>SingletonB</code> are annotated with <code>@Startup</code> which means they are going to initialized upon application startup. <code>SingletonC</code> will be initilized until the bean is going to be used in later injection point.</p>
	</li>
	<li>
	<p><code>SingletonB</code> is annotated with <code>@DependsOn("SingletonA")</code> to enforce a initialization order with respect to <code>SingletonA</code>.</p>
	</li>
	</ul>
	</div>
	<div class="paragraph">
	<p><code>SingletonA.java</code>: Singleton EJB annotated with <code>@Startup</code>. It depends on the EJB <code>Supervisor</code>.</p>
	</div>
	<div class="listingblock">
	<div class="content">
	<pre class="highlight"><code class="language-java" data-lang="java">package org.foo;

	import jakarta.annotation.PostConstruct;
	import jakarta.ejb.Singleton;
	import jakarta.ejb.Startup;
	import jakarta.inject.Inject;
	import java.util.logging.Logger;

	@Singleton
	@Startup
	public class SingletonA {

	@Inject
	Supervisor supervisor;

	private final static Logger LOGGER = Logger.getLogger(SingletonA.class.getName());


	@PostConstruct
	public void init() {
	LOGGER.info("Hi from init in class: " + this.getClass().getName());
	supervisor.addRecord(this.getClass().getSimpleName());
	}
	}</code></pre>
	</div>
	</div>
	<div class="paragraph">
	<p><code>SingletonB.java</code>: Singleton EJB annotated with <code>@Startup</code> and <code>DependsOn</code>. It depends on the EJB <code>Supervisor</code>.</p>
	</div>
	<div class="listingblock">
	<div class="content">
	<pre class="highlight"><code class="language-java" data-lang="java">package org.foo;

	import jakarta.annotation.PostConstruct;
	import jakarta.ejb.DependsOn;
	import jakarta.ejb.Singleton;
	import jakarta.ejb.Startup;
	import jakarta.inject.Inject;
	import java.util.logging.Logger;

	@Singleton
	@Startup
	@DependsOn("SingletonA")
	public class SingletonB {

	@Inject
	Supervisor supervisor;

	private final static Logger LOGGER = Logger.getLogger(SingletonB.class.getName());

	@PostConstruct
	public void init() {
	LOGGER.info("Hi from init in class: " + this.getClass().getName());
	supervisor.addRecord(this.getClass().getSimpleName());
	}
	}</code></pre>
	</div>
	</div>
	<div class="paragraph">
	<p><code>SingletonC.java</code>: Singleton EJB. It depends on the EJB <code>Supervisor</code>.</p>
	</div>
	<div class="listingblock">
	<div class="content">
	<pre class="highlight"><code class="language-java" data-lang="java">import jakarta.annotation.PostConstruct;
	import jakarta.ejb.Singleton;
	import jakarta.inject.Inject;
	import java.util.logging.Logger;

	@Singleton
	public class SingletonC {
	@Inject
	Supervisor supervisor;

	private final static Logger LOGGER = Logger.getLogger(SingletonC.class.getName());

	@PostConstruct
	public void init() {
	LOGGER.info("Hi from init in class: " + this.getClass().getName());
	supervisor.addRecord(this.getClass().getSimpleName());

	}

	public String hello() {
	return "Hello from SingletonC.class";
	}
	}</code></pre>
	</div>
	</div>
	<div class="paragraph">
	<p><code>Supervisor.java</code>: Applicaiton scoped Bean that keep track of a list of Bean Names.</p>
	</div>
	<div class="listingblock">
	<div class="content">
	<pre class="highlight"><code class="language-java" data-lang="java">import jakarta.enterprise.context.ApplicationScoped;
	import java.util.ArrayList;
	import java.util.List;

	@ApplicationScoped
	public class Supervisor {
	private final List<String> records = new ArrayList<>();

	public void addRecord(String beanClass){
	records.add(beanClass);
	}

	public String getRecord(){
	return records.toString();
	}
	}</code></pre>
	</div>
	</div>
	</div>
	<div class="sect2">
	<h3 id="_the_tests">The tests</h3>
	<div class="ulist">
	<ul>
	<li>
	<p>The class <code>TestSingletonStartupOrder.java</code> contains two test that are executed in order via the annotation <code>@FixMethodOrder(MethodSorters.NAME_ASCENDING)</code></p>
	</li>
	<li>
	<p><code>firstTest</code>: assert true if an only if the records stored in the <code>Supervisor.record</code> are equals to <code>[SingletonA, SingletonB]</code>. Notice that the order is validated too. In this test we don’t expect to see <code>SingletonC</code> initilized since it’s not annotated with <code>@Startup</code>.</p>
	</li>
	<li>
	<p><code>secondTest</code>: This test inject <code>SingletonC</code> as a parameter in the tests, therefore it asserts to true if an only if the records stored in the <code>Supervisor.record</code> are equals to <code>[SingletonA, SingletonB, SingletonC]</code></p>
	</li>
	</ul>
	</div>
	<div class="paragraph">
	<p><code>TestSingletonStartupOrder.java</code></p>
	</div>
	<div class="listingblock">
	<div class="content">
	<pre class="highlight"><code class="language-java" data-lang="java">import org.jboss.arquillian.container.test.api.Deployment;
	import org.jboss.arquillian.junit.Arquillian;
	import org.jboss.shrinkwrap.api.ShrinkWrap;
	import org.jboss.shrinkwrap.api.asset.StringAsset;
	import org.jboss.shrinkwrap.api.spec.WebArchive;
	import org.junit.FixMethodOrder;
	import org.junit.Test;
	import org.junit.runner.RunWith;
	import org.junit.runners.MethodSorters;
	import org.foo.SingletonA;
	import org.foo.SingletonB;
	import org.foo.SingletonC;
	import org.foo.Supervisor;

	import java.util.logging.Logger;

	import static junit.framework.TestCase.assertTrue;


	@RunWith(Arquillian.class)
	@FixMethodOrder(MethodSorters.NAME_ASCENDING)
	public class TestSingletonStartupOrder {
	private final static Logger LOGGER = Logger.getLogger(TestSingletonStartupOrder.class.getName());

	@Deployment()
	public static WebArchive createDeployment() {
	final WebArchive webArchive = ShrinkWrap.create(WebArchive.class, "test.war")
	.addClass(SingletonA.class)
	.addClass(SingletonB.class)
	.addClass(SingletonC.class)
	.addClass(Supervisor.class)
	.addAsWebInfResource(new StringAsset("<beans/>"), "beans.xml");
	return webArchive;
	}


	@Test
	public void firstTest(Supervisor supervisor) {
	LOGGER.info("SUPERVISOR: [" + supervisor.getRecord() + "]");
	assertTrue(supervisor.getRecord().equals("[SingletonA, SingletonB]"));
	}

	@Test
	public void secondTest(Supervisor supervisor, SingletonC singletonC) {
	LOGGER.info(singletonC.hello());
	LOGGER.info("SUPERVISOR: [" + supervisor.getRecord() + "]");
	assertTrue(supervisor.getRecord().equals("[SingletonA, SingletonB, SingletonC]"));
	}
	}</code></pre>
	</div>
	</div>
	</div>
	<div class="sect2">
	<h3 id="_about_the_test_architecture">About the Test architecture</h3>
	<div class="paragraph">
	<p>The test cases from this project are built using Arquillian and TomEE
	Remote. The arquillian configuration can be found in
	<code>src/test/resources/arquillian.xml</code></p>
	</div>
	</div>
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