Same Issue here. Not using archetype21 but upgrading existing AEM 6.3 project to AEM 6.5 error occurs with same maven-scr-plugin version  1.25.0. Trying to build with OpenJDK 11.

Thanks abhinash007​ for pointing this out. Sadly the documentation about this is unmistakably broken (e.g. here: Templates ) as it states that 'allowedPaths' should be defined on the template instead of 'jcr:content' of the template. Can someone from Adobe initiate that it is fixed?