java - Dependency injection with Jersey 2.0 -

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starting scratch without previous jersey 1.x knowledge, i'm having hard time understanding how setup dependency injection in jersey 2.0 project.

i understand hk2 available in jersey 2.0, cannot seem find docs jersey 2.0 integration.

@managedbean @path("myresource") public class myresource {      @inject     myservice myservice;      /**      * method handling http requests. returned object sent      * client "text/plain" media type.      *      * @return string returned text/plain response.      */     @get     @produces(mediatype.application_json)     @path("/getit")     public string getit() {         return "got {" + myservice + "}";     } }  @resource @managedbean public class myservice {     void servicecall() {         system.out.print("service calls");     } }

pom.xml

<properties>     <jersey.version>2.0-rc1</jersey.version>     <project.build.sourceencoding>utf-8</project.build.sourceencoding> </properties>  <dependencymanagement>     <dependencies>         <dependency>             <groupid>org.glassfish.jersey</groupid>             <artifactid>jersey-bom</artifactid>             <version>${jersey.version}</version>             <type>pom</type>             <scope>import</scope>         </dependency>     </dependencies> </dependencymanagement>  <dependencies>     <dependency>         <groupid>org.glassfish.jersey.core</groupid>         <artifactid>jersey-common</artifactid>     </dependency>     <dependency>         <groupid>org.glassfish.jersey.core</groupid>         <artifactid>jersey-server</artifactid>     </dependency>     <dependency>         <groupid>org.glassfish.jersey</groupid>         <artifactid>jax-rs-ri</artifactid>     </dependency> </dependencies>

i can container start , serve resource, add @inject myservice, framework throws exception:

severe: servlet.service() servlet [com.noip.myapplication] in context path [/jaxrs] threw exception [a multiexception has 3 exceptions.  are: 1. org.glassfish.hk2.api.unsatisfieddependencyexception: there no object available injection @ injectee(requiredtype=myservice,parent=myresource,qualifiers={}),position=-1,optional=false,self=false,unqualified=null,1039471128) 2. java.lang.illegalargumentexception: while attempting resolve dependencies of com.noip.myresource errors found 3. java.lang.illegalstateexception: unable perform operation: resolve on com.noip.myresource ] root cause org.glassfish.hk2.api.unsatisfieddependencyexception: there no object available injection @ injectee(requiredtype=myservice,parent=myresource,qualifiers={}),position=-1,optional=false,self=false,unqualified=null,1039471128)     @ org.jvnet.hk2.internal.threethirtyresolver.resolve(threethirtyresolver.java:74)


starter project available @ github: https://github.com/donaldjarmstrong/jaxrs

you need define abstractbinder , register in jax-rs application. binder specifies how dependency injection should create classes.

public class myapplicationbinder extends abstractbinder {     @override     protected void configure() {         bind(myservice.class).to(myservice.class);     } }

when @inject detected on parameter or field of type myservice.class instantiated using class myservice. use binder, need registered jax-rs application. in web.xml, define jax-rs application this:

<servlet>   <servlet-name>myapplication</servlet-name>   <servlet-class>org.glassfish.jersey.servlet.servletcontainer</servlet-class>   <init-param>     <param-name>javax.ws.rs.application</param-name>     <param-value>com.mypackage.myapplication</param-value>   </init-param>   <load-on-startup>1</load-on-startup> </servlet> <servlet-mapping>   <servlet-name>myapplication</servlet-name>   <url-pattern>/*</url-pattern> </servlet-mapping>

implement myapplication class (specified above in init-param).

public class myapplication extends resourceconfig {     public myapplication() {         register(new myapplicationbinder());         packages(true, "com.mypackage.rest");     } }

the binder specifying dependency injection registered in constructor of class, , tell application find rest resources (in case, myresource) using packages() method call.


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