hey Sanju Eapen , I can reproduce your problem .
a and b project is ok without problem.
But about c , I can see you want to make another MVCActionCommand to hook on original /login/create_account from com.liferay.login.web , and just do some log.
But the problem is , you used @Reference to inject a service into CreateAccountActionHook.java , but CreateAccountActionHook itself is also a MVCActionCommand service component ,and has higher service ranking , so when osgi container resolve and run the bundle , it will register a service with the same mvc.command.name and javax.portlet.name as the one from com.liferay.login.web and with higher service.ranking , then the container will inject CreateAccountActionHook into itself ! So there was "Circular reference detected".
The logic is wrong , when you go to create account page and fill some fields and click "Save" button , you expect it will call your command , but when you deploy your hook project , you expect it will call system original service , so it is contradictive.
So my suggestion is , add more condition when using reference annotation: such as
@Reference(
target =
"(&(mvc.command.name=/login/create_account)" +
"(javax.portlet.name=com_liferay_login_web_portlet_LoginPortlet)" +
"(component.name=com.liferay.login.web.internal.portlet.action.CreateAccountMVCActionCommand))"
)
and in this way , it will never cause such problem
