java - 获取自 EJB 以来的 RESTful 列表

Question

我有一个项目 maven - EAR，同时我有一个与 jersey 一起使用的 RESTful JAX-RS，它使用 JSON，当我尝试从 EJB 获取 RESTful 列表时，什么也没有带来。但是，当在同一个 REST 中添加列表时，效果很好。!

这是同一类中的 RESTful 列表!

@Path("/courseMockRS")
@Consumes({"application/json"})
@Produces({"application/json"})
public class CourseMock_RS {

@GET
@Path("/all_courses")
public List<CourseMock> AllCourses() {
    List<CourseMock> courses = getCoursesMock();
    return courses;
}

public List<CourseMock> getCoursesMock() {
    List<CourseMock> coursesMocks = new ArrayList<CourseMock>();

    CourseMock mock = new CourseMock();
    mock.setName("SOA Analist");
    mock.setAuthor("SOA Education");
    mock.setReleaseDate("16/07/2015");
    coursesMocks.add(mock);

    mock = new CourseMock();
    mock.setName("SOA Architect");
    mock.setAuthor("SOA ET");
    mock.setReleaseDate("16/07/2015");
    coursesMocks.add(mock);

    mock = new CourseMock();
    mock.setName("SOA Consultant");
    mock.setAuthor("SOA ET");
    mock.setReleaseDate("16/07/2015");
    coursesMocks.add(mock);

    return coursesMocks;
}
}

因此效果很好!

[{"name":"SOA Analist","author":"SOA Education","releaseDate":"16/07/2015"},    
{"name":"SOA Architect","author":"SOA ET","releaseDate":"16/07/2015"},
{"name":"SOA Consultant","author":"SOA ET","releaseDate":"16/07/2015"}]

但是当实现 EJB 找不到时!，但是应用程序已部署并且无状态资源被接受。

这是来自 EJB 的资源。

DTO

public class CourseMock {

private String name;
private String author;
private String releaseDate;

public String getName() {
    return name;
}

public void setName(String name) {
    this.name = name;
}

public String getAuthor() {
    return author;
}

public void setAuthor(String author) {
    this.author = author;
}

public String getReleaseDate() {
    return releaseDate;
}

public void setReleaseDate(String releaseDate) {
    this.releaseDate = releaseDate;
}   
}

外观

@Stateless
@LocalBean
public class CourseFacadeMock implements ICourseMockFacade{

private CourseMock mock;

@Override
public List<CourseMock> getCoursesMock() {
    List <CourseMock> coursesMocks = new ArrayList<CourseMock>();

    mock= new CourseMock();
    mock.setName("Analista SOA");
    mock.setAuthor("SOA Education");
    mock.setReleaseDate("16/07/2015");        
    coursesMocks.add(mock);

    mock= new CourseMock();
    mock.setName("SOA Analist");
    mock.setAuthor("SOA Education");
    mock.setReleaseDate("16/07/2015");
    coursesMocks.add(mock);

    mock = new CourseMock();
    mock.setName("SOA Architect");
    mock.setAuthor("SOA ET");
    mock.setReleaseDate("16/07/2015");
    coursesMocks.add(mock);

    mock = new CourseMock();
    mock.setName("SOA Consultant");
    mock.setAuthor("SOA ET");
    mock.setReleaseDate("16/07/2015");
    coursesMocks.add(mock);

    return coursesMocks;

}

}

界面外观

@Local
public interface ICourseMockFacade {

public List<CourseMock> getCoursesMock();
}

安静

@Path("/courseMockRS")
@Consumes({"application/json"})
@Produces({"application/json"})
public class CourseMock_RS {

@EJB
ICourseMockFacade courseMockFacade;

@GET
@Path("/all_courses")
public List<CourseMock> AllCourses() {
    List<CourseMock> courses = courseMockFacade.getCoursesMock();
    return courses;
}    
}

因此失败。异常是 NUllPointerException。请帮忙!.

Answer 1

我已经使用您的代码创建了一个项目，假设您已经使用以下内容设置了 JAX-RS 配置类，那么它可以完美运行:

@ApplicationPath("resources")
public class JAXRSConfiguration extends Application {

}

在这种情况下，如果 EJB 未注入(inject)，则问题可能出在 beans.xml 文件中，bean-discovery-mode 属性应设置为“all”。举个例子:

<?xml version="1.0" encoding="UTF-8"?>
<beans 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/beans_1_1.xsd"
   bean-discovery-mode="all">
</beans>

希望对您有所帮助。