java Dagger2找不到带注释的方法
我正在使用Gradle构建一个Java项目,使用Dagger2作为依赖注入程序。我得到一个错误:
<path to the class>/MyComponent.java:13: error: [Dagger/MissingBinding] <package>.ConnectionDTO cannot be provided without an @Inject constructor or an @Provides-annotated method.
ConnectionDTO sourceConnectionDTO();
^
<package>.ConnectionDTO is provided at
<package>.MyComponent.sourceConnectionDTO()
<path to the class>/MyComponent.java:14: error: [Dagger/MissingBinding] <package>.ConnectionDTO cannot be provided without an @Inject constructor or an @Provides-annotated method.
ConnectionDTO destinationConnectionDTO();
^
<package>.ConnectionDTO is provided at
<package>.MyComponent.destinationConnectionDTO()
Java版本1.8 渐变版本:5.4.1(也尝试了4.5.1)
匕首相关性:
dependencies {
annotationProcessor 'com.google.dagger:dagger-compiler:2.17'
compile 'com.google.dagger:dagger:2.17'
...
}
模块类别:
@Module
public class MyModule {
private final MyConfiguration config;
@Inject
public MetaStoreModule(MyConfiguration config){
this.config = config;
}
@Provides
@Singleton
@Named("sourceConnection")
public ConnectionDTO sourceConnectionDTO() {
return new ConnectionDTO(config.sourceHost(), config.sourceUser(),
config.sourcePassword(), config.sourceDataBaseName());
}
@Provides
@Singleton
@Named("destinationConnection")
public ConnectionDTO destinationConnectionDTO() {
return new ConnectionDTO(config.destinationHost(), config.destinationUser(),
config.destinationPassword(), config.destinationDataBaseName());
}
}
组件类别:
import dagger.Component;
import javax.inject.Singleton;
@Singleton
@Component(modules = MyModule.class)
public interface MyComponent{
ConnectionDTO sourceConnectionDTO();
ConnectionDTO destinationConnectionDTO();
}
不确定为什么如果对方法进行了注释,则生成无法识别它们
# 1 楼答案
您没有在任何地方添加
ConnectionDTO
,这就是Dagger抱怨找不到它的原因您可以添加
@Named("sourceConnection") ConnectionDTO
和@Named("destinationConnection") ConnectionDTO
,因此还应该请求那些