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 <h1>

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 <h1>Bean Validation - Design By Contract</h1>

 <p>Bean Validation (aka JSR 303) contains an optional appendix dealing with method validation.</p>

 <p>Some implementions of this JSR implement this appendix (Apache bval, Hibernate validator for example).</p>

 <p>OpenEJB provides an interceptor which allows you to use this feature to do design by contract.</p>

 <h1>Design by contract</h1>

 <p>The goal is to be able to configure with a finer grain your contract. In the example you specify
 the minimum centimeters a sport man should jump at pole vaulting:</p>

 <pre><code>@Local
 public interface PoleVaultingManager {
     int points(@Min(120) int centimeters);
 }
 </code></pre>

 <h1>Usage</h1>

 <p>TomEE and OpenEJB do not provide anymore <code>BeanValidationAppendixInterceptor</code> since
 Bean Validation 1.1 does it (with a slighly different usage but the exact same feature).</p>

 <p>So basically you don't need to configure anything to use it.</p>

 <h1>Errors</h1>

 <p>If a parameter is not validated an exception is thrown, it is an EJBException wrapping a ConstraintViolationException:</p>

 <pre><code>try {
     gamesManager.addSportMan("I lose", "EN");
     fail("no space should be in names");
 } catch (EJBException wrappingException) {
     assertTrue(wrappingException.getCause() instanceof ConstraintViolationException);
     ConstraintViolationException exception = ConstraintViolationException.class.cast(wrappingException.getCausedByException());
     assertEquals(1, exception.getConstraintViolations().size());
 }
 </code></pre>

 <h1>Example</h1>

 <h2>OlympicGamesManager</h2>

 <pre><code>package org.superbiz.designbycontract;

 import javax.ejb.Stateless;
 import javax.validation.constraints.NotNull;
 import javax.validation.constraints.Pattern;
 import javax.validation.constraints.Size;

 @Stateless
 public class OlympicGamesManager {
     public String addSportMan(@Pattern(regexp = "^[A-Za-z]+$") String name, @Size(min = 2, max = 4) String country) {
         if (country.equals("USA")) {
             return null;
         }
         return new StringBuilder(name).append(" [").append(country).append("]").toString();
     }
 }
 </code></pre>

 <h2>PoleVaultingManager</h2>

 <pre><code>package org.superbiz.designbycontract;

 import javax.ejb.Local;
 import javax.validation.constraints.Min;

 @Local
 public interface PoleVaultingManager {
     int points(@Min(120) int centimeters);
 }
 </code></pre>

 <h2>PoleVaultingManagerBean</h2>

 <pre><code>package org.superbiz.designbycontract;

 import javax.ejb.Stateless;

 @Stateless
 public class PoleVaultingManagerBean implements PoleVaultingManager {
     @Override
     public int points(int centimeters) {
         return centimeters - 120;
     }
 }
 </code></pre>

 <h2>OlympicGamesTest</h2>

 <pre><code>public class OlympicGamesTest {
     private static Context context;

     @EJB
     private OlympicGamesManager gamesManager;

     @EJB
     private PoleVaultingManager poleVaultingManager;

     @BeforeClass
     public static void start() {
         Properties properties = new Properties();
         properties.setProperty(BeanContext.USER_INTERCEPTOR_KEY, BeanValidationAppendixInterceptor.class.getName());
         context = EJBContainer.createEJBContainer(properties).getContext();
     }

     @Before
     public void inject() throws Exception {
         context.bind("inject", this);
     }

     @AfterClass
     public static void stop() throws Exception {
         if (context != null) {
             context.close();
         }
     }

     @Test
     public void sportMenOk() throws Exception {
         assertEquals("IWin [FR]", gamesManager.addSportMan("IWin", "FR"));
     }

     @Test
     public void sportMenKoBecauseOfName() throws Exception {
         try {
             gamesManager.addSportMan("I lose", "EN");
             fail("no space should be in names");
         } catch (EJBException wrappingException) {
             assertTrue(wrappingException.getCause() instanceof ConstraintViolationException);
             ConstraintViolationException exception = ConstraintViolationException.class.cast(wrappingException.getCausedByException());
             assertEquals(1, exception.getConstraintViolations().size());
         }
     }

     @Test
     public void sportMenKoBecauseOfCountry() throws Exception {
         try {
             gamesManager.addSportMan("ILoseTwo", "TOO-LONG");
             fail("country should be between 2 and 4 characters");
         } catch (EJBException wrappingException) {
             assertTrue(wrappingException.getCause() instanceof ConstraintViolationException);
             ConstraintViolationException exception = ConstraintViolationException.class.cast(wrappingException.getCausedByException());
             assertEquals(1, exception.getConstraintViolations().size());
         }
     }

     @Test
     public void polVaulting() throws Exception {
         assertEquals(100, poleVaultingManager.points(220));
     }

     @Test
     public void tooShortPolVaulting() throws Exception {
         try {
             poleVaultingManager.points(119);
             fail("the jump is too short");
         } catch (EJBException wrappingException) {
             assertTrue(wrappingException.getCause() instanceof ConstraintViolationException);
             ConstraintViolationException exception = ConstraintViolationException.class.cast(wrappingException.getCausedByException());
             assertEquals(1, exception.getConstraintViolations().size());
         }
     }
 }
 </code></pre>

 <h1>Running</h1>

 <pre><code>-------------------------------------------------------
  T E S T S
 -------------------------------------------------------
 Running OlympicGamesTest
 Apache OpenEJB 4.0.0-beta-1    build: 20111002-04:06
 http://tomee.apache.org/
 INFO - openejb.home = /Users/dblevins/examples/bean-validation-design-by-contract
 INFO - openejb.base = /Users/dblevins/examples/bean-validation-design-by-contract
 INFO - Using 'javax.ejb.embeddable.EJBContainer=true'
 INFO - Configuring Service(id=Default Security Service, type=SecurityService, provider-id=Default Security Service)
 INFO - Configuring Service(id=Default Transaction Manager, type=TransactionManager, provider-id=Default Transaction Manager)
 INFO - Found EjbModule in classpath: /Users/dblevins/examples/bean-validation-design-by-contract/target/classes
 INFO - Beginning load: /Users/dblevins/examples/bean-validation-design-by-contract/target/classes
 INFO - Configuring enterprise application: /Users/dblevins/examples/bean-validation-design-by-contract
 INFO - Configuring Service(id=Default Stateless Container, type=Container, provider-id=Default Stateless Container)
 INFO - Auto-creating a container for bean PoleVaultingManagerBean: Container(type=STATELESS, id=Default Stateless Container)
 INFO - Configuring Service(id=Default Managed Container, type=Container, provider-id=Default Managed Container)
 INFO - Auto-creating a container for bean OlympicGamesTest: Container(type=MANAGED, id=Default Managed Container)
 INFO - Enterprise application "/Users/dblevins/examples/bean-validation-design-by-contract" loaded.
 INFO - Assembling app: /Users/dblevins/examples/bean-validation-design-by-contract
 INFO - Jndi(name="java:global/bean-validation-design-by-contract/PoleVaultingManagerBean!org.superbiz.designbycontract.PoleVaultingManager")
 INFO - Jndi(name="java:global/bean-validation-design-by-contract/PoleVaultingManagerBean")
 INFO - Jndi(name="java:global/bean-validation-design-by-contract/OlympicGamesManager!org.superbiz.designbycontract.OlympicGamesManager")
 INFO - Jndi(name="java:global/bean-validation-design-by-contract/OlympicGamesManager")
 INFO - Jndi(name="java:global/EjbModule236054577/OlympicGamesTest!OlympicGamesTest")
 INFO - Jndi(name="java:global/EjbModule236054577/OlympicGamesTest")
 INFO - Created Ejb(deployment-id=OlympicGamesManager, ejb-name=OlympicGamesManager, container=Default Stateless Container)
 INFO - Created Ejb(deployment-id=PoleVaultingManagerBean, ejb-name=PoleVaultingManagerBean, container=Default Stateless Container)
 INFO - Created Ejb(deployment-id=OlympicGamesTest, ejb-name=OlympicGamesTest, container=Default Managed Container)
 INFO - Started Ejb(deployment-id=OlympicGamesManager, ejb-name=OlympicGamesManager, container=Default Stateless Container)
 INFO - Started Ejb(deployment-id=PoleVaultingManagerBean, ejb-name=PoleVaultingManagerBean, container=Default Stateless Container)
 INFO - Started Ejb(deployment-id=OlympicGamesTest, ejb-name=OlympicGamesTest, container=Default Managed Container)
 INFO - Deployed Application(path=/Users/dblevins/examples/bean-validation-design-by-contract)
 Tests run: 5, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 1.245 sec

 Results :

 Tests run: 5, Failures: 0, Errors: 0, Skipped: 0
 </code></pre>


 <div class="page-header">&nbsp;</div>
 <h4>APIs Used</h4>
 <ul><li><a href="http://docs.oracle.com/javaee/6/api/javax/ejb/EJB.html">javax.ejb.EJB</a></li>
 <li><a href="http://docs.oracle.com/javaee/6/api/javax/ejb/EJBException.html">javax.ejb.EJBException</a></li>
 <li><a href="http://docs.oracle.com/javaee/6/api/javax/ejb/Local.html">javax.ejb.Local</a></li>
 <li><a href="http://docs.oracle.com/javaee/6/api/javax/ejb/Stateless.html">javax.ejb.Stateless</a></li>
 <li><a href="http://docs.oracle.com/javaee/6/api/javax/ejb/embeddable/EJBContainer.html">javax.ejb.embeddable.EJBContainer</a></li>
 <li><a href="http://docs.oracle.com/javaee/6/api/javax/validation/ConstraintViolationException.html">javax.validation.ConstraintViolationException</a></li>
 <li><a href="http://docs.oracle.com/javaee/6/api/javax/validation/constraints/Min.html">javax.validation.constraints.Min</a></li>
 <li><a href="http://docs.oracle.com/javaee/6/api/javax/validation/constraints/Pattern.html">javax.validation.constraints.Pattern</a></li>
 <li><a href="http://docs.oracle.com/javaee/6/api/javax/validation/constraints/Size.html">javax.validation.constraints.Size</a></li>
 </ul>

 <h3>Source</h3>
   <ul>
       <li>Apache <a href="http://svn.apache.org/repos/asf/tomee/tomee/trunk/examples/bean-validation-design-by-contract">bean-validation-design-by-contract</a></li>
       <li>Github <a href="https://github.com/apache/tomee/tree/trunk/examples/bean-validation-design-by-contract">bean-validation-design-by-contract</a></li>
   </ul>
 <pre>
 svn co http://svn.apache.org/repos/asf/tomee/tomee/trunk/examples/bean-validation-design-by-contract
 cd bean-validation-design-by-contract
 mvn clean install
 </pre>


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	<div class="page-header">
	<h1>

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	</h1>
	</div>

	<h1>Bean Validation - Design By Contract</h1>

	<p>Bean Validation (aka JSR 303) contains an optional appendix dealing with method validation.</p>

	<p>Some implementions of this JSR implement this appendix (Apache bval, Hibernate validator for example).</p>

	<p>OpenEJB provides an interceptor which allows you to use this feature to do design by contract.</p>

	<h1>Design by contract</h1>

	<p>The goal is to be able to configure with a finer grain your contract. In the example you specify
	the minimum centimeters a sport man should jump at pole vaulting:</p>

	<pre><code>@Local
	public interface PoleVaultingManager {
	int points(@Min(120) int centimeters);
	}
	</code></pre>

	<h1>Usage</h1>

	<p>TomEE and OpenEJB do not provide anymore <code>BeanValidationAppendixInterceptor</code> since
	Bean Validation 1.1 does it (with a slighly different usage but the exact same feature).</p>

	<p>So basically you don't need to configure anything to use it.</p>

	<h1>Errors</h1>

	<p>If a parameter is not validated an exception is thrown, it is an EJBException wrapping a ConstraintViolationException:</p>

	<pre><code>try {
	gamesManager.addSportMan("I lose", "EN");
	fail("no space should be in names");
	} catch (EJBException wrappingException) {
	assertTrue(wrappingException.getCause() instanceof ConstraintViolationException);
	ConstraintViolationException exception = ConstraintViolationException.class.cast(wrappingException.getCausedByException());
	assertEquals(1, exception.getConstraintViolations().size());
	}
	</code></pre>

	<h1>Example</h1>

	<h2>OlympicGamesManager</h2>

	<pre><code>package org.superbiz.designbycontract;

	import javax.ejb.Stateless;
	import javax.validation.constraints.NotNull;
	import javax.validation.constraints.Pattern;
	import javax.validation.constraints.Size;

	@Stateless
	public class OlympicGamesManager {
	public String addSportMan(@Pattern(regexp = "^[A-Za-z]+$") String name, @Size(min = 2, max = 4) String country) {
	if (country.equals("USA")) {
	return null;
	}
	return new StringBuilder(name).append(" [").append(country).append("]").toString();
	}
	}
	</code></pre>

	<h2>PoleVaultingManager</h2>

	<pre><code>package org.superbiz.designbycontract;

	import javax.ejb.Local;
	import javax.validation.constraints.Min;

	@Local
	public interface PoleVaultingManager {
	int points(@Min(120) int centimeters);
	}
	</code></pre>

	<h2>PoleVaultingManagerBean</h2>

	<pre><code>package org.superbiz.designbycontract;

	import javax.ejb.Stateless;

	@Stateless
	public class PoleVaultingManagerBean implements PoleVaultingManager {
	@Override
	public int points(int centimeters) {
	return centimeters - 120;
	}
	}
	</code></pre>

	<h2>OlympicGamesTest</h2>

	<pre><code>public class OlympicGamesTest {
	private static Context context;

	@EJB
	private OlympicGamesManager gamesManager;

	@EJB
	private PoleVaultingManager poleVaultingManager;

	@BeforeClass
	public static void start() {
	Properties properties = new Properties();
	properties.setProperty(BeanContext.USER_INTERCEPTOR_KEY, BeanValidationAppendixInterceptor.class.getName());
	context = EJBContainer.createEJBContainer(properties).getContext();
	}

	@Before
	public void inject() throws Exception {
	context.bind("inject", this);
	}

	@AfterClass
	public static void stop() throws Exception {
	if (context != null) {
	context.close();
	}
	}

	@Test
	public void sportMenOk() throws Exception {
	assertEquals("IWin [FR]", gamesManager.addSportMan("IWin", "FR"));
	}

	@Test
	public void sportMenKoBecauseOfName() throws Exception {
	try {
	gamesManager.addSportMan("I lose", "EN");
	fail("no space should be in names");
	} catch (EJBException wrappingException) {
	assertTrue(wrappingException.getCause() instanceof ConstraintViolationException);
	ConstraintViolationException exception = ConstraintViolationException.class.cast(wrappingException.getCausedByException());
	assertEquals(1, exception.getConstraintViolations().size());
	}
	}

	@Test
	public void sportMenKoBecauseOfCountry() throws Exception {
	try {
	gamesManager.addSportMan("ILoseTwo", "TOO-LONG");
	fail("country should be between 2 and 4 characters");
	} catch (EJBException wrappingException) {
	assertTrue(wrappingException.getCause() instanceof ConstraintViolationException);
	ConstraintViolationException exception = ConstraintViolationException.class.cast(wrappingException.getCausedByException());
	assertEquals(1, exception.getConstraintViolations().size());
	}
	}

	@Test
	public void polVaulting() throws Exception {
	assertEquals(100, poleVaultingManager.points(220));
	}

	@Test
	public void tooShortPolVaulting() throws Exception {
	try {
	poleVaultingManager.points(119);
	fail("the jump is too short");
	} catch (EJBException wrappingException) {
	assertTrue(wrappingException.getCause() instanceof ConstraintViolationException);
	ConstraintViolationException exception = ConstraintViolationException.class.cast(wrappingException.getCausedByException());
	assertEquals(1, exception.getConstraintViolations().size());
	}
	}
	}
	</code></pre>

	<h1>Running</h1>

	<pre><code>-------------------------------------------------------
	T E S T S
	-------------------------------------------------------
	Running OlympicGamesTest
	Apache OpenEJB 4.0.0-beta-1 build: 20111002-04:06
	http://tomee.apache.org/
	INFO - openejb.home = /Users/dblevins/examples/bean-validation-design-by-contract
	INFO - openejb.base = /Users/dblevins/examples/bean-validation-design-by-contract
	INFO - Using 'javax.ejb.embeddable.EJBContainer=true'
	INFO - Configuring Service(id=Default Security Service, type=SecurityService, provider-id=Default Security Service)
	INFO - Configuring Service(id=Default Transaction Manager, type=TransactionManager, provider-id=Default Transaction Manager)
	INFO - Found EjbModule in classpath: /Users/dblevins/examples/bean-validation-design-by-contract/target/classes
	INFO - Beginning load: /Users/dblevins/examples/bean-validation-design-by-contract/target/classes
	INFO - Configuring enterprise application: /Users/dblevins/examples/bean-validation-design-by-contract
	INFO - Configuring Service(id=Default Stateless Container, type=Container, provider-id=Default Stateless Container)
	INFO - Auto-creating a container for bean PoleVaultingManagerBean: Container(type=STATELESS, id=Default Stateless Container)
	INFO - Configuring Service(id=Default Managed Container, type=Container, provider-id=Default Managed Container)
	INFO - Auto-creating a container for bean OlympicGamesTest: Container(type=MANAGED, id=Default Managed Container)
	INFO - Enterprise application "/Users/dblevins/examples/bean-validation-design-by-contract" loaded.
	INFO - Assembling app: /Users/dblevins/examples/bean-validation-design-by-contract
	INFO - Jndi(name="java:global/bean-validation-design-by-contract/PoleVaultingManagerBean!org.superbiz.designbycontract.PoleVaultingManager")
	INFO - Jndi(name="java:global/bean-validation-design-by-contract/PoleVaultingManagerBean")
	INFO - Jndi(name="java:global/bean-validation-design-by-contract/OlympicGamesManager!org.superbiz.designbycontract.OlympicGamesManager")
	INFO - Jndi(name="java:global/bean-validation-design-by-contract/OlympicGamesManager")
	INFO - Jndi(name="java:global/EjbModule236054577/OlympicGamesTest!OlympicGamesTest")
	INFO - Jndi(name="java:global/EjbModule236054577/OlympicGamesTest")
	INFO - Created Ejb(deployment-id=OlympicGamesManager, ejb-name=OlympicGamesManager, container=Default Stateless Container)
	INFO - Created Ejb(deployment-id=PoleVaultingManagerBean, ejb-name=PoleVaultingManagerBean, container=Default Stateless Container)
	INFO - Created Ejb(deployment-id=OlympicGamesTest, ejb-name=OlympicGamesTest, container=Default Managed Container)
	INFO - Started Ejb(deployment-id=OlympicGamesManager, ejb-name=OlympicGamesManager, container=Default Stateless Container)
	INFO - Started Ejb(deployment-id=PoleVaultingManagerBean, ejb-name=PoleVaultingManagerBean, container=Default Stateless Container)
	INFO - Started Ejb(deployment-id=OlympicGamesTest, ejb-name=OlympicGamesTest, container=Default Managed Container)
	INFO - Deployed Application(path=/Users/dblevins/examples/bean-validation-design-by-contract)
	Tests run: 5, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 1.245 sec

	Results :

	Tests run: 5, Failures: 0, Errors: 0, Skipped: 0
	</code></pre>


	<div class="page-header"> </div>
	<h4>APIs Used</h4>
	<ul><li><a href="http://docs.oracle.com/javaee/6/api/javax/ejb/EJB.html">javax.ejb.EJB</a></li>
	<li><a href="http://docs.oracle.com/javaee/6/api/javax/ejb/EJBException.html">javax.ejb.EJBException</a></li>
	<li><a href="http://docs.oracle.com/javaee/6/api/javax/ejb/Local.html">javax.ejb.Local</a></li>
	<li><a href="http://docs.oracle.com/javaee/6/api/javax/ejb/Stateless.html">javax.ejb.Stateless</a></li>
	<li><a href="http://docs.oracle.com/javaee/6/api/javax/ejb/embeddable/EJBContainer.html">javax.ejb.embeddable.EJBContainer</a></li>
	<li><a href="http://docs.oracle.com/javaee/6/api/javax/validation/ConstraintViolationException.html">javax.validation.ConstraintViolationException</a></li>
	<li><a href="http://docs.oracle.com/javaee/6/api/javax/validation/constraints/Min.html">javax.validation.constraints.Min</a></li>
	<li><a href="http://docs.oracle.com/javaee/6/api/javax/validation/constraints/Pattern.html">javax.validation.constraints.Pattern</a></li>
	<li><a href="http://docs.oracle.com/javaee/6/api/javax/validation/constraints/Size.html">javax.validation.constraints.Size</a></li>
	</ul>

	<h3>Source</h3>
	<ul>
	<li>Apache <a href="http://svn.apache.org/repos/asf/tomee/tomee/trunk/examples/bean-validation-design-by-contract">bean-validation-design-by-contract</a></li>
	<li>Github <a href="https://github.com/apache/tomee/tree/trunk/examples/bean-validation-design-by-contract">bean-validation-design-by-contract</a></li>
	</ul>
	<pre>
	svn co http://svn.apache.org/repos/asf/tomee/tomee/trunk/examples/bean-validation-design-by-contract
	cd bean-validation-design-by-contract
	mvn clean install
	</pre>


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