I use liberty application server and want to know , can create custom activation specification (inbound-resourceAdapter) without rar module ?
I want to implement that in war application not ear .
It is not possible (both in Liberty as well as in the Jakarta/Java EE specs) to provide an activation specification via a standalone WAR module. You need to package the activation specification within a RAR module, which can either be a standalone RAR module or a RAR module within an EAR. Using a standalone RAR module (providing the activation spec) and a standalone WAR module together could be an option if you are willing to do that.