Portlet 3.0 incompatibility with PortalUtil.copyRequestParameters(ActionRequest,ActionResponse)

• Type: Bug
• Status: Closed
• Resolution: Fixed
• Affects Version/s: Master
• Fix Version/s: 7.1.10 DXP FP9, 7.1.10.2 SP2, 7.1.3 CE GA4, 7.1.X, Master
• Component/s: Core Infrastructure > MVC Portlet
• Labels:
  • QA-AUTOMATION
  • liferay-dxp-71-sp2
  • liferay-fixpack-dxp-9-7110
• Branch Version/s:
  7.1.x
• Backported to Branch:
  Committed
• Fix Priority: 5
• Git Pull Request: https://github.com/brianchandotcom/liferay-portal/pull/69167
• QA Test Name:
  • LocalFile.SitetemplatesUsecase#EditSiteTemplateGuestPermissions
• QA Test Score: 4

Problem Background

The PortalUtil.copyRequestParameters(ActionRequest,ActionResponse) method is designed to preserve action request parameters into the render request by calling StateAwareResponse.setRenderParameter(String, String[]). However, the Portlet 3.0 Javadoc for this method has a new requirement such that IllegalArgumentException must be thrown if "if an element of the values array is null; if an attempt is made to set a public render parameter to null." Because of this new requirement, the PortalUtil.copyRequestParameters(ActionRequest,ActionResponse) method needs to make sure it does not pass a null array or an array that contains a null value.

Steps to Reproduce:

1. Go to Build > Pages
2. Edit the permission for Welcome page
3. Remove view permission for Site Member role
4. Click Save

Expected Result:
Success message occurs and no error in console.

Actual Result:

 Error:Your request failed to complete.

Error occurs when editing widget page permission.
There's also Error in console:

2019-03-06 05:52:21.337 ERROR [http-nio-9080-exec-9][PortletConfigurationPortlet:688] null