Question

对于我的生活，我无法通过hk2获得Jersey来自动发现@Service注释类并注入它们。我试图遵循堆栈溢出，泽西和hk2文档的每一个建议，仍然没有运气。我试图将一个简单的echo服务注入Jersey资源。骨架是从Jersey的简单webapp maven原型生成的，我试图扩展它。这就是我到目前为止所做的：

的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>

的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!");
    }
}

我已经检查过，抑制剂生成器确实运行并产生了它的输出，但是在运行Tomcat服务器时GETting http://localhost:8080/sandbox/webapi/myresource我得到了

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)

我缺少什么想法？我将不胜感激任何帮助:(

NB！我知道

但他们没有帮助我......

Answer 1

我结合了从这两个问题中获得的见解：

首先，在构建链中使用HK2 Metadata Generator（或居民生成器）（就像您一样）。这将扫描您的来源并创建Dipose()。

其次，创建一个新的META-INF/hk2-locator/default，填充元数据中的服务：

ServiceLocator

现在将其传递给ServiceLocator locator = ServiceLocatorUtilities.createAndPopulateServiceLocator();。引用@peeskillet：

泽西岛拥有自己的ServiceLocator，尝试获取它的参考并不容易。我们可以给泽西岛我们的ServiceLocator，但泽西岛最终仍然创建它自己的定位器，并用我们的定位器填充它。

Grizzly

Answer 2

通过使用扩展AbstractBinder的类，实例化它并将其注册到应用程序中，我解决了我的问题，就像这个问题一样。

resourceConfig.register(new DependencyBinder());

此外，

/**
 * 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

尝试在Application构造函数中添加需要扫描的包。包上的“true”参数表示以递归方式扫描包：

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

Answer 4

使用packages(true, "my.package.jerseytest"); 并使用org.glassfish.jersey.spi.Contract而不是org.jvnet.hk2.annotations.Contract注释。并且使用没有泛型的简单接口。

Answer 5

尝试添加@Stateless

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

Jersey Hk2注入@Service注释类

5 个答案: