Question

public class ToInject {
    public int val = 0;

    public ToInject(){
        System.out.println("Default");
    }
}

@Module
public class ToInjectModule {
    @Provides
    @Singleton
    public ToInject provideToInject(){
        return new ToInject();
    }
}

@Component(modules = ToInjectModule.class)
public interface ToInjectModuleComponent {
    WillGetInjected willGetInjectedMaker();
}

public class WillGetInjected {
    private ToInject toInject;
    @Inject
    public WillGetInjected(ToInject toInject){
        this.toInject = toInject;
        System.out.println(this.toInject.val);
    }
}

如上所述，我正在尝试将ToInject注入WillGetInjected中。我有一个ToInjectModule，也有一个ToInjectModuleComponent，所以我完全完全按照说明进行操作。我还导入了

<dependency>
            <groupId>com.google.dagger</groupId>
            <artifactId>dagger</artifactId>
            <version>2.0</version>
        </dependency>

但是当我执行mvn compile时，我仍然收到此错误：

Fatal error compiling: java.lang.NoClassDefFoundError: dagger/Subcomponent$Builder: dagger.Subcomponent$Builder -> [Help 1]

知道发生了什么，为什么？

Answer 1

有两个失踪案。

将dagger compiler添加到pom.xml（Link）

<build>
  <plugins>
    <plugin>
      <groupId>org.apache.maven.plugins</groupId>
      <artifactId>maven-compiler-plugin</artifactId>
      <version>3.6.1</version>
      <configuration>
        <annotationProcessorPaths>
          <path>
            <groupId>com.google.dagger</groupId>
            <artifactId>dagger-compiler</artifactId>
            <version>2.x</version>
          </path>
        </annotationProcessorPaths>
      </configuration>
    </plugin>
  </plugins>
</build>

将annotation scope添加到组件中。（Link参见Singletons and Scoped Bindings）

@Component(modules = ToInjectModule.class)
public interface ToInjectModuleComponent {
    WillGetInjected willGetInjectedMaker();
}

到

@Singleton
@Component(modules = ToInjectModule.class)
public interface ToInjectModuleComponent {
    WillGetInjected willGetInjectedMaker();
}

Java中找不到Dagger组件错误？

1 个答案: