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Recently upgraded Tomcat server to 9.0.102 from 9.0.98. Now it throws the error:

org.apache.catalina.connector.Request.startAsync Unable to start async because the following classes in the processing chain do not support async.(com.mycompany.LoginServlet).

The error is triggered by a doForward() request to a JSP.

It's a legacy web-app running on Servlet 2.5. I am aware async operation is not supported until 3.0+. Did something change in Tomcat 9.0.102 enforcing async-support that is causing this behavior?

I am planning to upgrade web.xml to servlet 3.0 and add async-support on the servlets throwing this exception. Any tips?

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