In the JWS 3.1 installation guide, it is said JWS 3.1 is only supported running on Windows Server 2012. It is conflicting with the JWS 3 Supported Configuration page which is saying as long as the Tomcat in JWS 3 is running on the supported JDK, then it will be supported.

As per documentation :

https://access.redhat.com/documentation/en-us/red_hat_jboss_web_server/3.1/html/installation_guide/installing_jboss_web_server_on_microsoft_windows
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IMPORTANT :
JBoss Web Server 3.1 support for Microsoft Windows is limited to the Oracle JDK (versions 1.7 and 1.8) on Windows Server 2012.
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With the 3.1 release, we make a distinction between the platforms that the Tomcat java bits are supported on, and the native bits including Apace HTTP are supported on.

Tomcat is supported on a defined set of Vendor JVMs and versions.
Apache HTTP and other native components are supported on a specified set of OSs and Architectures.