CODEWITHSUNDEEP
javaspringpriority-queuecomparator
Jacob
Jacob

Reputation: 797

Instantiate a priority queue with a comparator from spring

As part of learning spring, I'm trying to declare a priority queue bean of MyMessageObject objects, but keep getting the following BeanCreationException: "Error creating bean with name 'messagesHeap' defined in URL [file:/my.app.spring.xml]: Could not resolve matching constructor"

Here's my spring definitions:

<bean id="messagesHeap" class="java.util.PriorityQueue">
    <constructor-arg type="int" name="initialCapacity" value="100" index="0"/>
    <constructor-arg name="comparator" type="java.util.Comparator" index="1"  ref="orderComparator"/>
</bean>

<bean id="orderComparator" class="com.my.myComparator"/>

The class myComparator implements java.util.Comparator as required.

What am I doing wrong here?

Upvotes: 2

Views: 448

Answers (1)

Evgeniy Dorofeev
Evgeniy Dorofeev

Reputation: 136002

try this

<bean id="messagesHeap" class="java.util.PriorityQueue">
    <constructor-arg value="100" />
    <constructor-arg ref="orderComparator" />
</bean>

Upvotes: 1

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