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| <div class='page-header'> |
| |
| <h1>Constructor Injection</h1> |
| </div> |
| </div> |
| </div> |
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| |
| <div class="col-md-12"> |
| <div class="paragraph"> |
| <p>For those of you who would like to use final fields, |
| wish to avoid numerous setters, or dislike private field injection and |
| would like nothing more than to just use plan old java constructors, |
| your wish has come true. This is a feature we intended to add to OpenEJB |
| 3.0 but didn’t have time for. We’re happy to bring it to the OpenEJB 3.1 |
| release and with a bit of luck and support from people like yourself, |
| we’ll see this as an EJB 3.1 feature as well.</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="highlight"><code class="language-java" data-lang="java">@Stateless |
| public class WidgetBean implements Widget { |
| |
| @EJB(beanName = "FooBean") |
| private final Foo foo; |
| |
| @Resource(name = "count") |
| private final int count; |
| |
| @Resource |
| private final DataSource ds; |
| |
| public WidgetBean(Integer count, Foo foo, DataSource ds) { |
| this.count = count; |
| this.foo = foo; |
| this.ds = ds; |
| } |
| |
| public int getCount() { |
| return count; |
| } |
| |
| public Foo getFoo() { |
| return foo; |
| } |
| }</code></pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>The <code>@EJB</code>, <code>@Resource</code>, <code>@PersistenceUnit</code>, and <code>@PersistenceContext</code> |
| annotations can be placed at the class-level instead such as:</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="highlight"><code class="language-java" data-lang="java">@Stateless |
| @EJB(name = "foo", beanInterface = Foo.class, beanName = "FooBean") |
| @Resource(name = "count", type = int.class) |
| @Resource(name = "ds", type = DataSource.class) |
| public class WidgetBean implements Widget { |
| |
| public WidgetBean(Integer count, Foo foo, DataSource ds) { |
| // do something |
| } |
| |
| public int getCount() { |
| return count; |
| } |
| |
| public Foo getFoo() { |
| return foo; |
| } |
| }</code></pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>Currently this functionality relies on classes being compiled with debug |
| symbols (the default compile setting for javac) as we use the debug |
| table in the byte code to discover the constructor arg names. |
| Additionally, you must not have a no-arg constructor. If a no-arg |
| constructor is present, that constructor will be used instead.</p> |
| </div> |
| <div class="paragraph"> |
| <p>Ideally, we would like the annotations to be used on the parameters |
| directly as shown below. Unfortunately, this does not work as the Java |
| EE annotation classes do not permit usage on parameters. If you’d like |
| to see that change as much as we do, definitely voice your support by |
| sending note to |
| <a href="mailto:jsr-316-comments@jcp.org.html">jsr-316-comments@jcp.org</a></p> |
| </div> |
| <div class="paragraph"> |
| <p>Not yet possible</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="highlight"><code class="language-java" data-lang="java">@Stateless |
| |
| public class WidgetBean implements Widget { |
| |
| public WidgetBean(@Resource(name = "count") Integer count, @EJB Foo foo, @Resource DataSource ds) { |
| // do something |
| } |
| |
| public int getCount() { |
| return count; |
| } |
| |
| public Foo getFoo() { |
| return foo; |
| } |
| }</code></pre> |
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