Java Google Guice辅助注入对象为空

我需要在运行时使用用户定义的数据创建对象。为此，我使用了 google guice协助注入。但当我运行测试时，它抛出

null

指针异常。请告诉我哪里出错

IArtifacts界面

public interface IArtifacts {

    MavenMetaDataXMLDTO getArtifactsVersions();
}

public interface ArtifactsFactory {

    IArtifacts create(ProductProfile productProfile);
}

ArtifactsService.java

public class ArtifactsService implements IArtifacts {

    private ProductProfile productProfile;

    @Inject
    public ArtifactsService(@Assisted ProductProfile productProfile){
        System.out.println(productProfile.getArtifactManagementURL());
        this.productProfile=productProfile;
    }

    @Override
    public MavenMetaDataXMLDTO getArtifactsVersions() {

        System.out.println(productProfile.getArtifactManagementURL());
        return null;
    }
}

工件工厂界面

public interface IArtifacts {

    MavenMetaDataXMLDTO getArtifactsVersions();
}

public interface ArtifactsFactory {

    IArtifacts create(ProductProfile productProfile);
}

模块类

@Override
    protected void configure() {
    install(new FactoryModuleBuilder().implement(IArtifacts.class,ArtifactsService.class).build(ArtifactsFactory.class));
}

TestArtifacts.java

public class TestArtifacts {

    @Inject // this obj is null
    private ArtifactsFactory artifactsFactory;

    private  IArtifacts s;

    public TestArtifacts(){

    }

    public void getdata(){
        //Pass custom data to factory
        this.s=artifactsFactory.create(Products.QA.get());
        System.out.println(s.getArtifactsVersions());
    }


}  

 private Injector injector=Guice.createInjector(new MYModule());//where implemented configuration

    @Inject
    private ArtifactsFactory artifactsFactory=injector.getInstance(ArtifactsFactory.class);

休息终点

    @GET
    @Path("/test")
    @Produces(MediaType.APPLICATION_JSON)
    public String getartifacts(){
      new TestArtifacts().getdata();
    }

---

您在Rest端点类中自己创建了TestArtifacts类的实例，但所有类都需要由Guice框架而不是您创建

那么，当您使用新工具创建类时，Guice框架应该如何向类中注入一些东西呢？您还需要将类TestArtifacts注入Rest端点，并且您的Rest端点也必须由Guice创建

更新：

也许这个链接会对你有所帮助

---

我能够通过向下面的TestArtifacts.java类添加以下代码片段来修复它

TestArtifacts.java

public class TestArtifacts {

    @Inject // this obj is null
    private ArtifactsFactory artifactsFactory;

    private  IArtifacts s;

    public TestArtifacts(){

    }

    public void getdata(){
        //Pass custom data to factory
        this.s=artifactsFactory.create(Products.QA.get());
        System.out.println(s.getArtifactsVersions());
    }


}  

 private Injector injector=Guice.createInjector(new MYModule());//where implemented configuration

    @Inject
    private ArtifactsFactory artifactsFactory=injector.getInstance(ArtifactsFactory.class);

---

谢谢你的快速回复。你有样品可供参考吗。