Add support for servletContext.setInitParameter() when servletContext didn't start yet

• Type: Bug
• Status: Closed
• Resolution: Fixed
• Affects Version/s: 7.0.0 DXP SP2, Master
• Fix Version/s: 7.0.0 DXP FP10, 7.0.0 DXP SP2, 7.0.3 CE GA4, 7.1.X, Master
• Component/s: Core Infrastructure, Core Infrastructure > Wab Extender
• Labels:
  • liferay-digital-enterprise-70-sp2
  • liferay-fixpack-de-10-7010
• Branch Version/s:
  7.0.x
• Backported to Branch:
  Committed
• Story Points: 1
• Fix Priority: 3
• Git Pull Request: https://github.com/brianchandotcom/liferay-portal/pull/45482

Servlet 3 api allows to set init parameters (those with <context-param> if coming from web.xml) while servletContext isn't initialized yet.

For example, If doing so from a servletContainerInitializer, it will throw an IllegalStateException.

This will make many frameworks (like Spring Boot like here: https://github.com/spring-projects/spring-boot/blob/master/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/jersey/JerseyAutoConfiguration.java#L229) to not work, as they use this API method.

Steps to reproduce

1. Deploy attached portlet (com.lps69270.sample-1.0-SNAPSHOT.war).
2. Access http://localhost:8080/o/com.lps69270.sample-1.0-SNAPSHOT/foo

Expected behaviour: you should see 3 messages like this at the end of the page:

setting context Init param works!

context Init param is visible from Listener!

context attribute was set properly from Initializer!

Actual behaviour: those three messages doesn't show exactly like that, stating some of those doesn't work.

First seen in forums: https://web.liferay.com/community/forums/-/message_boards/view_message/81031101