ClassNotFoundException is thrown for a listener-class when deploying a WAR in Liferay DXP

• Type: Bug
• Status: Closed
• Resolution: Fixed
• Affects Version/s: Master
• Fix Version/s: 7.0.0 DXP FP35, 7.0.0 DXP SP7, 7.0.5 CE GA6, 7.0.X, 7.1.0 M1, 7.1.X, Master
• Component/s: Core Infrastructure > Wab Generator
• Labels:
  • backend_test
  • ee-ts
  • liferay-digital-enterprise-70-sp7
  • liferay-fixpack-de-35-7010
• Branch Version/s:
  7.0.x
• Backported to Branch:
  Committed
• Story Points: 1
• Fix Priority: 2
• Git Pull Request: https://github.com/brianchandotcom/liferay-portal/pull/53624

Description
When deploying a war-styled plugin with listener-classes declared in web.xml, the deployed plugin does not work as expected.

Details
WAR-styled plugins are processed by Liferay's WAB Generator during deployment.
Based on the documentation, the listener-classes declared should have their packages added under the Import-Package header in the WAB's META-INF/MANIFEST.MF file.

The WAB Generator detects packages a plugin's JSPs and descriptor files reference. 
The descriptor files include web.xml, liferay-web.xml, portlet.xml, liferay-portlet.xml, and liferay-hook.xml. 

The WAB Generator verifies whether the detected packages are in the plugin's WEB-INF/classes folder or in a JAR file in the plugin's WEB-INF/lib folder. 
Packages that aren't found in either location are added to an Import-Package header in the WAB's META-INF/MANIFEST.MF file.

Reference: https://dev.liferay.com/develop/tutorials/-/knowledge_base/7-0/using-the-wab-generator

Since the packages of the declared listener-classes are not added to the Import-Package header, a ClassNotFoundException is being thrown.

Steps to Reproduce

1. Startup Liferay
2. Deploy the attached wab-import-poc.war
3. Observe log
   • Expected Result: The bundle will boot successfully
   • Actual Result: ClassNotFoundException is thrown
4. Shutdown Liferay
5. Include the following portal property:

   module.framework.web.generator.headers.Import-Package[wab-import-poc]=com.liferay.portal.kernel.spring.context
   

1. Restart Liferay and wait till it starts up completely
2. Re-deploy the attached wab-import-poc.jar
   • Notice: ClassNotFoundException is no longer thrown.

Additional Details
Attached is a POC war-styled plugin that was generated using Liferay Blade's: WAR MVC Portlet template.
Reference: https://dev.liferay.com/develop/reference/-/knowledge_base/7-0/war-mvc-portlet-template

The only change was modifying web.xml to include the following listener-class tag:

<listener>
	<listener-class>com.liferay.portal.kernel.spring.context.PortletContextLoaderListener</listener-class>
</listener>

Attached is also the source: wab-import-poc-src.zip