Coherence*Web allows session data to be shared by different Web applications deployed in the same or different Web containers. To do so, you must correctly configure the Coherence*Web cookie context parameters and you must make the classes of objects stored in session attributes available to each Web application.
To find out how to keep Web applications from accessing each other's data, see "How do I prevent session data from being shared by different apps?".
If you are using cookies to store session IDs (that is, you are not using URL rewriting), you must set the coherence-session-cookie-path context parameter to a common context path of all Web applications that share session data. For example, if you would like to share session data between two Web applications registered under the contexts paths /web/HRPortal and /web/InWeb, you should set the coherence-session-cookie-path parameter to /web. On the other hand, if the two Web applications are registered under the context paths /HRPortal and /InWeb, you should set the coherence-session-cookie-path parameter to /.
If the Web applications that you would like to share session data are deployed on different Web containers running on different machines (that are not behind a common load balancer), you must also set the coherence-session-cookie-domain parameter to a domain shared by the machines. For example, if you would like to share session data between two Web applications running on server1.mydomain.com and server2.mydomain.com, you must set the coherence-session-cookie-domain parameter to .mydomain.com.
To correctly serialize/deserialize objects stored in shared sessions, the classes of all objects stored in session attributes must be available to Web applications that share session data. For Web applications deployed on different containers, the classes may be placed in either the Web container or Web application classpath; however, for application deployed in the same Web container, the classes must be placed in the Web container classpath. This is due to the fact that most containers load each Web application using a separate ClassLoader.