You can use the wsadmin tool to stop applications.
There are two ways to complete this task. Firstly, you can use the AdminControl object to stop the application. Alternatively, you can use the scripts in the AdminApplication script library to start, stop, and administer your application configurations.

Representational State Transfer (REST) is a lightweight framework for designing applications that use HTTP to make calls. REST uses HTTP to perform the Create, Read, Update, and Delete (CRUD) operations between client and server. Applications interact with the services by using HTTP, POST, PUT, GET, and DELETE operations.
Reference: https://www.ibm.com/support/knowledgecenter/en/SSZLC2_7.0.0/ com.ibm.commerce.webservices.doc/concepts/cwvrest.htm

The runtime environment for Web components is called the Web container.. It processes servlets, JSP files, and other types of server-side components.
References:http://www.redbooks.ibm.com/redpapers/pdfs/redp4309.pdf

Verify that the application placement controller is enabled. The application placement controller is enabled by default. The application placement controller enables the autonomic capabilities of dynamic clusters.