After further research let me ask the question in a different way:

  *   Tomcat 10 is configured to do log4j2 logging.
  *   My log4j2 code works fine.
  *   Spring-cloud-azure-starter-active-directory seems to use logback and it 
is incompatible with my Tomcat 10 setup.

Given the above… what do I need to add to Tomcat 10 to make it handle apps that 
use logback for logging but still use my log4j2 Tomcat configuration for the 
actual logging?

I would swear that Tomcat had slf4j and other logging translation libraries 
built in… but perhaps Tomcat 10 no longer does for some and requires adding 
some jars?

b.

From: Mark Thomas <ma...@apache.org>
Sent: Tuesday, April 11, 2023 2:41 PM
To: users@tomcat.apache.org
Subject: Re: Is Microsoft's spring-cloud-azure-starter-active-directory for 
Spring Boot 3 / Spring 6 compatible with Tomcat 10?

On 11/04/2023 20: 28, BRUNO MELLONI wrote: > I was able to migrate applications 
to Spring Boot 3 / Spring 6 (standalone or running on Tomcat 10) so long as 
authentication was NOT through Azure AD. > > But when I tried to migrate 
applications
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On 11/04/2023 20:28, BRUNO MELLONI wrote:

> I was able to migrate applications to Spring Boot 3 / Spring 6 (standalone or 
> running on Tomcat 10) so long as authentication was NOT through Azure AD.

>

> But when I tried to migrate applications that used Microsoft's 
> spring-cloud-azure-starter-active-directory for authentication of 2-step 
> authenticated webapps (the preferred approach) I started to get this error 
> during application deploy to Tomcat 10:

>

> Cannot cast ch.qos.logback.classic.servlet.LogbackServletContainerInitializer 
> to jakarta.servlet.ServletContainerInitializer

>

>

> My suspicion is that Microsoft's latest implementation is not compatible with 
> Tomcat's approach to support log4j logging (as far as I know the approach has 
> been around since at least Tomcat 9).  But of course I could be wrong.   Has 
> anybody had any success?  Was there any trick to migrating to Spring Boot 3 / 
> Spring 6 / Tomcat 10 with 2-step authentication and authorization using Azure 
> AD?

>

>

>

> NOTE:  I did succeed with 2-step auth with Azure AD when I dropped the 
> Microsoft spring-cloud-azure-starter-active-directory dependency and instead 
> used the raw OAuth2 approach to connect to Azure AD.  The problem though is 
> that roles defined in Azure are not coming through to the GrantedAuthorities 
> of the SecurityContext or Principal.  I know I could extract the UPN from the 
> Principal and then define the AD Groups in the on-premises AD instead of 
> Azure AD, but that would require code changes and what is worse it would make 
> me hostage to the availability of sysadmins that manage our on-premises AD... 
> meaning weeks of delay for new AD groups.  It is a hack that I'd rather not 
> use if Azure authorization can be made to work properly.

>

> Any other advice will be welcome too.



No idea but some questions that might help.



Some sort of Java EE / Jakarta EE conflict?



A JAR present in the WAR that contains some of the Servlet API JARs?



Which version of which JAR is that ServletContainerInitializer coming from?



Mark



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