Jersey Hk2 Injection @Service annotated classes

Question

Throughout life, I cannot get Jersey with hk2 to automatically open annotated @Service classes and introduce them. I tried to follow all the tips for stack overflow, jersey and documentation on hk2 and still no luck. I am trying to introduce a simple echo service to a Jersey resource. The skeleton is created from a simple japp webapp maven archetype that I was trying to expand. This is what I have so far:

pom.xml

<build> <finalName>sandbox</finalName> <plugins> <plugin> <groupId>org.glassfish.hk2</groupId> <artifactId>hk2-inhabitant-generator</artifactId> <version>2.3.0</version> <executions> <execution> <configuration> <verbose>true</verbose> </configuration> <goals> <goal>generate-inhabitants</goal> </goals> </execution> </executions> </plugin> </plugins> </build> ... <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.containers</groupId> <artifactId>jersey-container-servlet-core</artifactId> </dependency> <dependency> <groupId>org.glassfish.hk2</groupId> <artifactId>hk2</artifactId> <version>2.3.0</version> </dependency> </dependencies> 

web.xml

 <servlet> <servlet-name>Jersey Web Application</servlet-name> <servlet-class>org.glassfish.jersey.servlet.ServletContainer</servlet-class> <init-param> <param-name>jersey.config.server.provider.packages</param-name> <param-value>my.package.jerseytest</param-value> </init-param> <init-param> <param-name>javax.ws.rs.Application</param-name> <param-value>my.package.jerseytest.application.Application</param-value> </init-param> <load-on-startup>1</load-on-startup> </servlet> 

my.package.jerseytest.application.Application

 public class Application extends ResourceConfig { public Application() { ServiceLocator locator = ServiceLocatorUtilities.createAndPopulateServiceLocator(); } } 

my.package.jerseytest.service.EchoService

 @Service public class EchoService { public String generateResponse(String echo) { return echo; } } 

my.package.jerseytest.resource.MyResource

 @Path("myresource") public class MyResource { @Inject EchoService echoService; @GET @Produces(MediaType.TEXT_PLAIN) public String getIt() { return echoService.generateResponse("Got it!"); } } 

I checked that the inhibitor generator really starts and produces its output, but when starting the Tomcat server getting http://localhost:8080/sandbox/webapi/myresource I get

 SEVERE: Servlet.service() for servlet [Jersey Web Application] in context with path [/sandbox] threw exception [A MultiException has 3 exceptions. They are: 1. org.glassfish.hk2.api.UnsatisfiedDependencyException: There was no object available for injection at SystemInjecteeImpl(requiredType=EchoService,parent=MyResource,qualifiers={},position=-1,optional=false,self=false,unqualified=null,932014249) 2. java.lang.IllegalArgumentException: While attempting to resolve the dependencies of my.package.jerseytest.resource.MyResource errors were found 3. java.lang.IllegalStateException: Unable to perform operation: resolve on my.package.jerseytest.resource.MyResource ] with root cause org.glassfish.hk2.api.UnsatisfiedDependencyException: There was no object available for injection at SystemInjecteeImpl(requiredType=EchoService,parent=MyResource,qualifiers={},position=-1,optional=false,self=false,unqualified=null,932014249) 

Any ideas what I am missing? I would be grateful for any help :(

NB! I know about

• How does ServiceLocator find @Service and @Contact automatically in HK2?
• HK2 annotations are not processed
• https://hk2.java.net/inhabitant-generator.html
• https://hk2.java.net/2.2.0-b25/getting-started.html
• https://java.net/jira/browse/HK2-165

but they didn’t help me ...

Answer 1

I combined the understanding that I received from these two questions:

• How does ServiceLocator find @Service and @Contact automatically in HK2?
• jersey + grizzly + hk2: dependency injection but not in resource

First, use the HK2 Metadata Generator (or the residential generator) in your build chain (as you already did). This scans your source and creates META-INF/hk2-locator/default .

Secondly, create a new ServiceLocator populated with services from metadata:

 ServiceLocator locator = ServiceLocatorUtilities.createAndPopulateServiceLocator(); 

Now pass on to Grizzly . Quoting @peeskillet :

Jersey has its own ServiceLocator, and it’s not easy to try to get a link to it. We could provide Jersey with our ServiceLocator, but Jersey ultimately still creates its own locator and populates it with our locator.

 ResourceConfig config = new MyApplicationConfig(); HttpServer server = GrizzlyHttpServerFactory.createHttpServer( URI.create(BASE_URI), config, serviceLocator ); 

Answer 2

I solved my problem just like this, using a class that extends AbstractBinder, instantiating and registering it with the application.

 resourceConfig.register(new DependencyBinder()); 

Besides,

 /** * dependency injection bindings. * Jersey requires that service implementations are bound to their contracts this way. */ public final class DependencyBinder extends AbstractBinder { @Override protected final void configure() { bind(StatusServiceImpl.class).to(StatusService.class); } } 

Answer 3

Try adding packages that you want to scan in the Application constructor. The true option in packets means scanning the packet recursively:

 public class Application extends ResourceConfig { public Application() { packages(true, "my.package.jerseytest"); ServiceLocator locator = ServiceLocatorUtilities.createAndPopulateServiceLocator(); } } 

Answer 4

Use packages(true, "my.package.jerseytest"); And use the annotation org.glassfish.jersey.spi.Contract not org.jvnet.hk2.annotations.Contract . And use simple interfaces without generics.

Answer 5

Try adding @Stateless

 @Path("myresource") @Stateless public class MyResource { @Inject EchoService echoService; ... }