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I'm trying to override the email-notification sent out by Liferay Form. I've followed the tricks in this topic: https://community.liferay.com/it/forums/-/message_boards/view_message/104934134.
No dice. I've succesfully added a custom implementation of DDLFormEmailNotificationSender. Which is registered correctly, (with correct service). If I check out the registered service, My custom DDLFormEmailNotificationSender comes out on top. But when I submit a form, liferay keeps using the 'normal' DDLFormEmailNotificationSender, and not my custom DDLFormEmailNotificationSender. Any tips 'n tricks?

My DDLFormEmailNotificationSender looks like this:

@Component(
 immediate = true,
 property = 
 "service.ranking:Integer=100"
 ,
 service = DDLFormEmailNotificationSender.class
)
public class CustomDDLFormEmailNotificationSender extends DDLFormEmailNotificationSender 

 private static final String CUSTOM_TEMPLATE_PATH = "";

 @Override
 protected Template createTemplate(
 PortletRequest portletRequest, DDLRecordSet recordSet,
 DDLRecord record) throws PortalException 

 Template template = TemplateManagerUtil.getTemplate(TemplateConstants.LANG_TYPE_SOY,
 getTemplateResource(CUSTOM_TEMPLATE_PATH), false);

 populateParameters(template, portletRequest, recordSet, record);

 return template;
 

(I know the CUSTOM_TEMPLATE_PATH is empty right now. But that's only for testing purposes.

I've created a fragment to expose the private package as described in the forum post:

Bundle-Name: liferay-xxx-dynamic-data-lists-form-override
Bundle-SymbolicName: liferay.xxx.dynamic.data.lists.form.override
Fragment-Host: com.liferay.dynamic.data.lists.form.web;bundle-version="2.0.15"

Export-Package: com.liferay.dynamic.data.lists.form.web.internal.notification
-jsp: *.jsp,*.jspf
-plugin.jsp: com.liferay.ant.bnd.jsp.JspAnalyzerPlugin
-plugin.resourcebundle: com.liferay.ant.bnd.resource.bundle.ResourceBundleLoaderAnalyzerPlugin
-plugin.sass: com.liferay.ant.bnd.sass.SassAnalyzerPlugin
-sass: *

So you can see I've exposed the "com.liferay.dynamic.data.lists.form.web.internal.notification" package.

If I check the DDLFormEmailNotificationSender in Apache GOGO:

services | grep DDLFormEmailNotificationSender
com.liferay.dynamic.data.lists.form.web.internal.notification.DDLFormEmailNotificationSender=service.ranking=100, component.name=be.xxx.portal.website.form.CustomDDLFormEmailNotificationSender, component.id=519, service.id=299, service.bundleid=757, service.scope=bundle
com.liferay.dynamic.data.lists.form.web.internal.notification.DDLFormEmailNotificationSender=component.name=com.liferay.dynamic.data.lists.form.web.internal.notification.DDLFormEmailNotificationSender, component.id=811, service.id=2629, service.bundleid=143, service.scope=bundle
true

I'm on Liferay 7.0.

I've got some support from the Liferay Community, and found out how to fix it.

Above configuration is correct! But, the (liferay)service referencing the DDLFormEmailNotification, has this reference static / reluctant. I had to create a config file to drop in my osgi/configs folder, which defines the correct implementation. (My CustomDDLFormEmailNotificationSender).

My config file is named: com.liferay.dynamic.data.lists.form.web.internal.portlet.action.AddRecordMVCActionCommand.config

This is because I need to configure the AddRecordMVCAction command. (Configure references that are defined there as static / reluctant).

It contains:

DDLFormEmailNotificationSender.target="(component.name=be.xxx.portal.website.form.CustomDDLFormEmailNotificationSender)"

So basicly it says: DDLFormEmailNotificationSender (is the reference name there), should be: be.xxx.portal.website.form.CustomDDLFormEmailNotificationSender.

Make sure that component is deployed correctly, because once configured, there is no fallback to the original implementation. (If you remove that configuration, osgi will fallback).

Source: https://dev.liferay.com/en/develop/tutorials/-/knowledge_base/7-0/overriding-service-references#find-the-component-and-service-reference

Hope this helps someone.