java - 指定 GenericKeyed Pool 的构造函数 Arg ( Apache Commons )

Question

我正在尝试使用 spring 配置注入(inject)值:但我收到此错误

Could not resolve matching constructor (hint: specify index/type/name arguments for simple parameters to avoid type ambiguities)

Spring 代码片段是:

<bean id="Pool" class="org.apache.commons.pool.impl.GenericKeyedObjectPool">
        <constructor-arg name = "factory" ref="xyzFactory" />
        <constructor-arg type = "int" name = "maxActive" value='3' />
        <constructor-arg type= "byte" name = "whenExhaustedAction" value='WHEN_EXHAUSTED_GROW' />       
        <constructor-arg type = "long" name = "maxWait" value='3000' />
        <constructor-arg type = "int" name = "maxIdle" value='3' />
        <constructor-arg name = "testOnBorrow" value='true' />
        <constructor-arg name = "testOnReturn" value='true' />
    </bean>

请指教？

Answer 1

有了这个

<constructor-arg type= "byte" name = "whenExhaustedAction" value='WHEN_EXHAUSTED_GROW' />       

Spring 将尝试转换 String值"WHEN_EXHAUSTED_GROW"到 byte并失败。

您应该能够使用 <util:constant>

<constructor-arg type= "byte" name = "whenExhaustedAction" />     
    <util:constant static-field="org.apache.commons.pool.impl.GenericKeyedObjectPool.WHEN_EXHAUSTED_GROW"/>
</constructor-arg>

解析 static 的值 field 。不要忘记将相应的命名空间添加到您的 xml 上下文中。

<小时/>

请保持一致，并在属性值上使用双引号。