We are on AEM 6.5 with uber-jar-6.5.15We are trying to use log4j 2.x.x in order to be able to use lambda expression in log statements. How can we achieve this?

I am seeing this with version 5.1.2 and error is java.lang.IllegalArgumentException: Illegal page name. io.wcm.testing.aem-mock.junit5 version: 5.1.2 

yes, I was hoping to know if there was something as part of Configuration or Property itself. Thank you.

Is it possible to specify a CA configuration as required or Not-Null or Unique.I am exploring for a use-case where I don't want my config collection which has a key-value pair properties to be blank or duplicate. Is there is an OOTB specifier which I have missed? Sample configs.I want to avoid cases...

@arunpatidar : thank you for replying.Not exactly what I was looking for initially but I understand we will have to use an alternative.thanks.

No, this is needed inside RTE component.thank you.

@Raja_Reddy : thank you for looking at this. We are able to add static values into the style plugin.The values in step 2-6 are meant to be dynamic for our use-case, which is our main concern at this point.

[Update]: Is it possible to have the values under /apps/...../text/..../rteplugins/styles/styles to come dynamically instead of static values?We have a requirement to have RTE styles plugin with dynamic drop-down values. We have the list of values but somehow unable to bind those values in styles pl...

@gkalyan : Thanks for replying.Ask is to use 400-error, 500-error (just an ex) node names for error pages due to some constraint.Currently we have put a redirect in dispatcher from 400 -> 400-error etc.We are still exploring if this can be done without that redirect rule.

Is it possible to create custom error pages instead of 400 OR 500 for e.g. 400-error, 500-error?If yes, can it be done without needing a redirect rule in dispatcher configuration?