How do you inject a list of objects?

[Carl Myers]

Say I have an interface, like WidgetGroker, and I have several implementations of WidgetGroker. I want my Component to have a class layout like this:

class JiraEventListener {

private Collection<WidgetGroker> grokers;

 

public JiraEventListener(Collection<WidgetGroker> theGrokers) {

    this.grokers = theGrokers;

}

 

@EventListener

public void eventListener(...) { .... }

// ...

}

I tried this and spring exploded with "no unique bean" errors or "no matching ctor" or whatever. Is there a way to do this? I have a <component> thing in my atlassian-plugin.xml for each implementation of WidgetGroker as well as a proper listener definition for JiraEventListener.

Thanks!

-Carl

EDIT: formatting fail =(

[Julien Hoarau · Accepted solution]

You can do that by adding a Spring configuration file in resources/META-INF/spring/plugin-components.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
             xmlns:osgi="http://www.springframework.org/schema/osgi"
             xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
             xsi:schemaLocation="http://www.springframework.org/schema/beans
                                 http://www.springframework.org/schema/beans/spring-beans-2.5.xsd
                                 http://www.springframework.org/schema/osgi
                                 http://www.springframework.org/schema/osgi/spring-osgi.xsd"
             default-autowire="autodetect">

  <bean id="jiraEventListener" class="com.company.product.package.JiraEventListener">
    <constructor-arg>
      <list>
        <ref bean="groker1"/>
        <ref bean="groker2"/>
        <ref bean="groker3"/>
      </list>
    </constructor-arg>
  </bean>

</beans>

[Carl Myers]

Awesome! I will try this out and accept your answer when I get it working =D

[Dennis Kromhout van der Meer]

Hi Carl, let us know if this answer works for you :)

[Carl Myers]

Sorry it took me so long to find time to test this answer - it totally works for me! Thanks very much! =D

[Carl Myers]

BTW, if your constructor takes multiple arguments, you probably have to list them too - so my actual code looks something like this:

<bean id="blah">
  <constructor-arg ref="arg1"/>
  <constructor-arg ref="arg1"/>
  <constructor-arg ref="arg2"/>
  <constructor-arg>
    <list>
      <ref bean="arg3-item1"/>
      <ref bean="arg3-item2"/>
    </list>
  </constructor-arg>
  <constructor-arg ref="arg4"/>
  <!-- .... -->
 </bean>

EDIT: fixed the code - recently realized it wasn't quite right.