EventListener is not called in Bitbucket 4.4.1 or 4.0.1

I've create some EventListeners for listening to pull request events, such as open, reopened, declined, merge.  They were work successfully in the Bitbucket 4.9.1, but when I changed to Bitbucket 4.4.1 or 4.0.1, these EventListeners aren't even triggered. BTW, I wrote plugin by scala. Here is my example class:

import com.atlassian.bitbucket.event.pull.PullRequestDeclinedEvent
import com.atlassian.event.api.EventListener
import com.fr.cra.Logging
import org.springframework.beans.factory.annotation.Autowired
import org.springframework.stereotype.Component

class PullRequestDeclinedListener @Autowired()(cachedRepoInformation : CachedRepoInformation) extends AnyRef with Logging {
  def onPullRequestDeclined(event : PullRequestDeclinedEvent) : Unit = {
    println("pullrequest declined")
    val pr = event.getPullRequest

AND, I use spring Atlassian spring scanner while I need not register the listener to Atlassian-plugin.xml.

2 answers

Hmm, I wonder if it's related to this:  https://answers.atlassian.com/questions/43550567.   Seems some Java 8 features don't work with the Spring scanner.   If you rewrite your listener class from Scala to pure Java 7 I suspect it might start working.

I changed project jdk to 1.7, doesn't work still. 

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