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Example of event listeners does not work (Crowd plugin)

Hi,

I'm trying to run the example of a Crowd plugin with Event Listeners but it does not work.

I see differences between the official documentation and the repository example. For example, in the repository there is no listener section in atlassian-plugin.xml.

I have replaced the "System.out.println" line with a slf4j logger, but it also does not print any logs when a user is created.

If I add the listener section in atlassian-plugin.xml, when I launch Crowd it returns an error of ClassNotFoundException:

2022-06-16 09:48:53,336 localhost-startStop-1 ERROR [atlassian.plugin.manager.DefaultPluginManager] There was an error loading the descriptor 'User Created Listener' of plugin 'com.atlassian.crowd.example.crowd-event-listener-example'. Disabling.
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'com.atlassian.crowd.event.listener.example.UserCreatedListener': Lookup method resolution failed; nested exception is java.lang.IllegalStateException: Failed to introspect Class [com.atlassian.crowd.event.listener.example.UserCreatedListener] from ClassLoader [com.atlassian.crowd.example.crowd-event-listener-example [28]]
at com.atlassian.crowd.console.listener.StartupListener.contextInitialized(StartupListener.java:101)
at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4705)
Caused by: java.lang.IllegalStateException: Failed to introspect Class [com.atlassian.crowd.event.listener.example.UserCreatedListener] from ClassLoader [com.atlassian.crowd.example.crowd-event-listener-example [28]]
Caused by: java.lang.ClassNotFoundException: com.atlassian.crowd.event.user.UserCreatedEvent not found by com.atlassian.crowd.example.crowd-event-listener-example [28]

This is the source code (without the listener section):

UserCreatedListener.java

package com.atlassian.crowd.event.listener.example;

import com.atlassian.crowd.event.user.UserCreatedEvent;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class UserCreatedListener{
private static final Logger log = LoggerFactory.getLogger(UserCreatedListener.class);

@com.atlassian.event.api.EventListener
public void printUserCreatedEvent(UserCreatedEvent event) {
log.debug("User " + event.getUser().getDisplayName() + " has been created.");
}
}

atlassian-plugin.xml

<atlassian-plugin key="${project.groupId}.${project.artifactId}" name="${project.name}" plugins-version="2">
<plugin-info>
<description>${project.description}</description>
<version>${project.version}</version>
<vendor name="${project.organization.name}" url="${project.organization.url}" />
</plugin-info>
</atlassian-plugin>

pom.xml

<?xml version="1.0" encoding="UTF-8"?>

<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">

<modelVersion>4.0.0</modelVersion>
<groupId>com.atlassian.crowd.event.listener.example</groupId>
<artifactId>crowd-event-listener-example</artifactId>
<version>1.0.1-SNAPSHOT</version>

<organization>
<name>Example Company</name>
<url>http://www.example.com/</url>
</organization>

<name>event-listener-example</name>
<description>This is an event listener plugin for Atlassian Crowd.</description>
<packaging>atlassian-plugin</packaging>

<repositories>
<repository>
<id>atlassian-public</id>
<url>https://packages.atlassian.com/mvn/maven-external/</url>
<snapshots>
<enabled>true</enabled>
<updatePolicy>never</updatePolicy>
<checksumPolicy>warn</checksumPolicy>
</snapshots>
<releases>
<enabled>true</enabled>
<checksumPolicy>warn</checksumPolicy>
</releases>
</repository>
</repositories>

<pluginRepositories>
<pluginRepository>
<id>atlassian-public</id>
<url>https://packages.atlassian.com/mvn/maven-external/</url>
<snapshots>
<enabled>true</enabled>
<updatePolicy>never</updatePolicy>
<checksumPolicy>warn</checksumPolicy>
</snapshots>
<releases>
<enabled>true</enabled>
<checksumPolicy>warn</checksumPolicy>
</releases>
</pluginRepository>
</pluginRepositories>

<dependencies>
<dependency>
<groupId>com.atlassian.crowd</groupId>
<artifactId>crowd-events</artifactId>
<version>${crowd.version}</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>com.atlassian.event</groupId>
<artifactId>atlassian-event</artifactId>
<version>4.1.2</version>
<scope>provided</scope>
</dependency>
</dependencies>

<build>
<plugins>
<plugin>
<groupId>com.atlassian.maven.plugins</groupId>
<artifactId>crowd-maven-plugin</artifactId>
<version>8.2.3</version>
<extensions>true</extensions>
<configuration>
<productVersion>${crowd.version}</productVersion>
<productDataVersion>${crowd.data.version}</productDataVersion>
<enableQuickReload>true</enableQuickReload>

<instructions>
<Import-Package>
com.atlassian.event.*
</Import-Package>
</instructions>
</configuration>
</plugin>
<plugin>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.8.1</version>
<configuration>
<source>1.8</source>
<target>1.8</target>
</configuration>
</plugin>
</plugins>
</build>

<properties>
<crowd.version>4.3.5</crowd.version>
<crowd.data.version>4.1.10</crowd.data.version>
</properties>
</project>

 Thanks!

1 answer

Hey @CARLOS MEDINA SANCHEZ and welcome to the community!

I tried to download and run this example and have same problem as you have: ClassNotFoundException, when I was running my Crowd.

I can describe my way to solve this issue:
1) I created my custom crowd plugin with command:

atlas-create-crowd-plugin

2) Then I updated my atlas-create-crowd-plugin-module. That will allow you to use Crowd 4.4. 

AMPS_PLUGIN_VERSION="8.5.0"

3) I added UserCreatedListener class and dependencies to newly created project.
Also you can use different log levels. Other way to enable DEBUG level use this how to. Just for fun I enabled them all:

System.out.println("User " + event.getUser().getDisplayName() + " has been created.");
log.info("User " + event.getUser().getDisplayName() + " has been created.");
log.warn("User " + event.getUser().getDisplayName() + " has been created.");
log.debug("User " + event.getUser().getDisplayName() + " has been created.");
log.error("User " + event.getUser().getDisplayName() + " has been created.");


4) Then I used this command to run Crowd 4.4 with my plugin.

mvn crowd:run

And after I created user I had this message in logs:
Screenshot 2022-06-23 at 12.11.26.png

 

I hope this small guide will help you to resolve the issue.

upd:
You can find atlas-create-crowd-plugin-module file in your atlassian-plugin-sdk folder. For me it was:

/usr/local/Cellar/atlassian-plugin-sdk/8.2.7/libexec/bin/atlas-create-crowd-plugin-module

 

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