Question

我正在使用jersey，EJB开发RESTful Web应用程序。使用JBoss版本6.4.0

我的其他控制器在没有EJB依赖注入的情况下工作正常，但是当我尝试使用EJB依赖注入时，它会在REST控制器中抛出NullPointerException。

我的控制器控制器

prefetchRowsAt

我的服务

@Path("message")
public class DocumentController {

  @EJB
  private TestService testService;

  @GET
  public String greeting()
  {
    return testService.greeting(); // testService is null in there !!!
  }
}

单身人士

@Stateless
public class TestServiceImpl implements TestService {
  @EJB
  private SingletonBean singletonBean;

  @Override
  public String greeting()
  {
    return singletonBean.getName();
  }
}

public interface TestService {
  String greeting();
}

Maven依赖

@Singleton
public class SingletonBeanImpl implements SingletonBean {

  @Override
  public String getName()
  {
    return "Vazgen";
  }
}

public interface SingletonBean {
  String getName();
}

我禁用了resteasy web.xml文件

<dependency>
    <groupId>org.jboss.spec.javax.ejb</groupId>
    <artifactId>jboss-ejb-api_3.1_spec</artifactId>
    <version>1.0.2.Final</version>
    <scope>provided</scope>
</dependency>

<dependency>
    <groupId>org.glassfish.jersey.containers</groupId>
    <artifactId>jersey-container-servlet-core</artifactId>
    <version>2.25.1</version>
</dependency>

<dependency>
    <groupId>javax.servlet</groupId>
    <artifactId>javax.servlet-api</artifactId>
    <version>4.0.0</version>
    <scope>provided</scope>
</dependency>

JBoss日志

<?xml version="1.0" encoding="ISO-8859-1" ?>
<web-app version="3.1" xmlns="http://xmlns.jcp.org/xml/ns/javaee"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd">

    <display-name>Application display name</display-name>

    <servlet>
        <servlet-name>Jersey REST Service</servlet-name>
        <servlet-class>org.glassfish.jersey.servlet.ServletContainer</servlet-class>

        <init-param>
            <param-name>jersey.config.server.provider.packages</param-name>
            <param-value>com.myorg.application.controller</param-value>
        </init-param>

        <init-param>
            <param-name>com.sun.jersey.api.json.POJOMappingFeature</param-name>
            <param-value>true</param-value>
        </init-param>
    </servlet>

    <servlet-mapping>
        <servlet-name>Jersey REST Service</servlet-name>
        <url-pattern>/*</url-pattern>
    </servlet-mapping>

    <context-param>
        <param-name>resteasy.scan</param-name>
        <param-value>false</param-value>
    </context-param>
    <context-param>
        <param-name>resteasy.scan.providers</param-name>
        <param-value>false</param-value>
    </context-param>
    <context-param>
        <param-name>resteasy.scan.resources</param-name>
        <param-value>false</param-value>
    </context-param>
</web-app>

你能帮我理解什么是问题吗？

EJB依赖注入中的NullPointerException

0 个答案: