吉斯MapBinder

我使用吉斯在Java中+科特林項目注入算法實現的地圖到一個特定的bean，但我不斷收到吉斯MapBinder

1) No implementation for java.util.Map<java.lang.String, ? extends com.scherule.scheduling.algorithms.SchedulingAlgorithm> annotated with @com.google.inject.name.Named(value=scheduling.algorithms) was bound. 
    while locating java.util.Map<java.lang.String, ? extends com.scherule.scheduling.algorithms.SchedulingAlgorithm> annotated with @com.google.inject.name.Named(value=scheduling.algorithms) 
    for the 2nd parameter of com.scherule.scheduling.SchedulingJobConsumer.<init>(SchedulingJobConsumer.kt:17) 
    while locating com.scherule.scheduling.SchedulingJobConsumer

模塊的定義是這樣定義的：

class AlgorithmsModule : AbstractModule() { 

    override fun configure() { 
     MapBinder.newMapBinder(binder(), 
       String::class.java, 
       SchedulingAlgorithm::class.java, 
       Names.named("scheduling.algorithms") 
     ).addBinding("interval-projection").toInstance(IntervalProjectionAlgorithm()) 
    } 

}

和呼叫者的代碼是：

@Singleton 
class SchedulingJobConsumer 
@Inject constructor(
     @Named("scheduling.channel") channel: Channel, 
     @Named("scheduling.algorithms") val schedulers: Map<String, SchedulingAlgorithm> 
) : DefaultConsumer(channel) ...

但是當我做

injector.getInstance(Key.get(new TypeLiteral<Map<String, SchedulingAlgorithm>>() {}, named("scheduling.algorithms")))

它在那裏。怎麼了？

來源

2017-07-24 kboom

嘗試在'val schedulers'的聲明中添加'@ JvmSuppressWildcards'註釋 – yole

將它添加到構造函數聲明中不會改變任何內容。在字段上執行此操作會將錯誤消息修改爲java.util.Map的No實現（...）所以它似乎甚至找不到它。 – kboom

錯誤消息似乎說它找不到SchedulingAlgorithm的實現。那是如何定義的？ – Les

問題在於Kotlin Generics！= Java Generics。

This Kotlin code。

@Named("scheduling.algorithms") val schedulers: Map<String, SchedulingAlgorithm>

獲取在注射吉斯尋找Map<String, ? extends SchedulingAlgorithm>爲它不具有約束力的MapBinder創建的綁定爲Map<String, SchedulingAlgorithm>編譯爲

Map<String, ? extends SchedulingAlgorithm> and not Map<String, SchedulingAlgorithm>

。

來源

2017-09-12 13:11:06

回答

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