曖昧工廠方法的參數類型錯誤接線的ExecutorService的

Question

時，我有一個bean定義爲：

<bean id="executor" class="java.util.concurrent.Executors" 
     factory-method="newSingleThreadExecutor" destroy-method="shutdownNow" /> 

當加載，這不幸的原因：

Ignoring factory method [public static java.util.concurrent.ExecutorService java.util.concurrent.Executors.newSingleThreadExecutor(java.util.concurrent.ThreadFactory)] of bean 'executor': 
org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'executor' defined in class path resource [main-config.xml]: Unsatisfied dependency expressed through constructor argument with index 0 of type [java.util.concurrent.ThreadFactory]: Ambiguous factory method argument types - did you specify the correct bean references as factory method arguments? 

春天似乎要使用的newSingleThreadExecutor（ ThreadFactory）方法，而我只想使用無參數方法。任何想法爲什麼？

Answer 1

我不知道您使用的是哪個版本的彈簧，but every document for versions above 3.0 state爲靜態工廠方法提供參數，您需要在<bean>元素內使用<constructor-arg>。

指定

<bean id="executor" class="java.util.concurrent.Executors" 
    factory-method="newSingleThreadExecutor" destroy-method="shutdownNow" /> 

將使用無參數方法newSingleThreadExeutor()。