Question

用于所有数据源连接的连接池类。它有一个静态枚举来指示连接类型。

class ConnectionPool {

   public static enum Type {
     t1,
     t2,
     t3;
   }
…
}

另一个类没有默认承包商，构造函数将Type作为承包商参数

class Update {
   public Update(Type type) {
      this.type = type;
   }
...
}

在applicationContext.xml中，定义了一个bean

<bean id="update" class="package.Update">
    <contructor-arg type="package.ConnectionPool.Type">
        <value>Type.t1</value>
    </contructor-arg>
</bean>

但我得到了

Error creating bean with name 'update' defined in class path resource [applicationContext.xml]: Unsatisfied dependency expressed through constructor argument with index 0 of type [package.ConnectionPools$PoolType]: Ambiguous constructor argument types - did you specify the correct bean references as constructor arguments?

Answer 1

这应该有效：

<bean id="update" class="package.Update">
    <contructor-arg type="package.ConnectionPool.Type">
        <value>t1</value>
    </contructor-arg>
</bean>

甚至：

<bean id="update" class="package.Update">
    <contructor-arg type="package.ConnectionPool.Type" value="t1"/>
</bean>

或我最喜欢的：

@Configuration
public class Config {

    @Bean
    public Update update() {
        return new Update(t1);
    }

}

定义bean采用枚举构造函数arg

1 个答案: