java - @Produces @Named给出WELD-001408

我正在努力了解CDI，在这种情况下，注释为@Produces和@Named
我有以下代码

@RunWith(CdiRunner.class)
public class cdiTest {

@Inject
protected CDIModel em;

@Test
public void injectionTest(){
    Assert.assertEquals("this", em.getMyString());
}

}

public class CDIModel {

String myString;

public CDIModel(String myString) {
    this.myString = myString;
}

public String getMyString() {
    return myString;
}
}

public class EntityProducer {

@Produces
@Named("this")
@Singleton
public CDIModel doThis() {
    return new CDIModel("this");
}

@Produces
@Named("that")
@Singleton
public CDIModel doThat() {
    return new CDIModel("that");
}

}

我为什么得到

org.jboss.weld.exceptions.DeploymentException: WELD-001408: Unsatisfied
dependencies for type CDIModel with qualifiers @Named
  at injection point [UnbackedAnnotatedField] @Inject @Named protected
persistence.dao.cdiTest.em
  at persistence.dao.cdiTest.em(cdiTest.java:0)

添加@AdditionalClasses(EntityProducer.class)后，我得到

org.jboss.weld.exceptions.DeploymentException: WELD-001409: Ambiguous
dependencies for type CDIModel with qualifiers @Default
at injection point [UnbackedAnnotatedField] @Inject protected
dk.nykredit.lanc.persistence.dao.cdiTest.em
at dk.nykredit.lanc.persistence.dao.cdiTest.em(cdiTest.java:0)
Possible dependencies:
- Producer Method [CDIModel] with qualifiers [@Default @Named @Any] declared
as [[BackedAnnotatedMethod] @Produces @Named @Singleton public
persistence.dao.EntityProducer.doThat()],
- Producer Method [CDIModel] with qualifiers [@Default @Named @Any] declared
as [[BackedAnnotatedMethod] @Produces @Named @Singleton public
persistence.dao.EntityProducer.doThis()]

最佳答案

CDI-Unit不会扫描所有类，因此不会了解EntityProducer类。因此，您必须手动添加要由CDI扫描的类/程序包。

您可以使用@AdditionalClasses批注:

@RunWith(CdiRunner.class)
@AdditionalClasses(EntityProducer.class)
public class cdiTest {
    ....
    ....

}

编辑

然后，您得到了一个模糊的依赖关系，因为您没有适当地限定您的注射质量。您应该在测试类中使用@Named("this")或@Named("that"):

@Inject
@Named("this") // or @Named("that")
protected CDIModel em;

另请注意，在CDI中，我们通常使用@Qualifier而不是@Named

关于java - @Produces @Named给出WELD-001408，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/44825105/