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<!DOCTYPE chapter [<!ENTITY % ents SYSTEM "jersey.ent" > %ents;]>
<chapter xmlns="http://docbook.org/ns/docbook"
         version="5.0"
         xml:lang="en"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xmlns:xi="http://www.w3.org/2001/XInclude"
         xmlns:xlink="http://www.w3.org/1999/xlink"
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                             http://www.w3.org/1999/xlink http://www.w3.org/1999/xlink.xsd"
         xml:id="spring">
    <title>Spring DI</title>

    <para>
        Jersey provides an extension to support Spring DI.
        This enables Jersey to use Spring beans as JAX-RS components (e.g. resources and providers) and also allows
        Spring to inject into Jersey managed components.
    </para>

    <para>
        The Spring extension module configuration is based on annotations.
        Spring beans are injected and JAX-RS classes are made Spring managed using annotations.
        Injected Spring beans can have further dependencies injected using Spring XML configuration.
        Spring singleton and request scopes are supported.
    </para>

    <para>
        To enable JAX-RS resources to work Spring functionality that requires proxying, such as Spring transaction management
        (with <literal>@Transactional</literal>), Spring Security and aspect oriented programming (such as <literal>@Aspect</literal>), the resources
        must themselves be managed by Spring, by annotating with <literal>@Component</literal>, <literal>@Service</literal>,
        <literal>@Controller</literal> or <literal>@Repository</literal>:

        <programlisting language="java" linenumbering="numbered">import javax.ws.rs.GET;
import javax.ws.rs.Path;
import org.springframework.stereotype.Component;

@Component
@Path("/")
public class SomeResource {

    @Transactional
    @GET
    public void updateResource() {
        // ...
    }
}
        </programlisting>
    </para>

    <para>
        Limitations:

        <itemizedlist>
            <listitem><para>Spring beans can't be injected directly into JAX-RS classes by using Spring XML configuration</para></listitem>
        </itemizedlist>
    </para>

    <section>
        <title>Dependencies</title>

        <para>
            If you want to use Jersey Spring DI support
            you will need to add the <literal>jersey-spring4</literal> module into the list of your dependencies:

            <programlisting language="xml">&lt;dependency&gt;
    &lt;groupId&gt;org.glassfish.jersey.ext&lt;/groupId&gt;
    &lt;artifactId&gt;jersey-spring4&lt;/artifactId&gt;
    &lt;version&gt;&version;&lt;/version&gt;
&lt;/dependency&gt;</programlisting>
        </para>

        <para>
            The above module adds transitive dependencies on Spring modules.
            See &jersey.ext.spring4.deps.link; module dependencies for more details about list and scope of dependencies.
            Please note the module depends on &hk2.spring-bridge.link; that is used to inject Spring services into HK2 services
            or inject HK2 services into Spring services.
        </para>

    </section>

    <section>
        <title>Registration and Configuration</title>

        <para>
            To use capabilities of Jersey Spring 3 DI support in your JAX-RS/Jersey application you need to have
            the above mentioned module on your class-path.
        </para>

    </section>

    <section>
        <title>Example</title>

        <para>To see an example of Spring DI support in Jersey refer to the
            <link xlink:href='&jersey.github.examples.uri;/helloworld-spring-webapp'>Spring DI Example</link>.</para>
    </section>
</chapter>