How to share attributes between sessions?

asked 2020-12-01 01:20:37 +0800

softteam gravatar image softteam
120 8

updated 2020-12-02 20:13:58 +0800


I would like to know the best way to get an attribute of one session from another. We are working with different projects (.war) and every project has his own session. I want to set an attribute that represents the style of the first .war and then get that attribute from another session created by a second .war.

Which is the best way to do this? Can the second session get the attribute from the first one? There is other variable that the two sessions share? We use Tomcat.

Thank you,


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answered 2020-12-01 17:34:09 +0800

cor3000 gravatar image cor3000
5868 2 7
ZK Team

There are definitely ways to share data between war files... however the servlet specification doesn't provide such. Since ZK is built on top of the servlet spec there isn't a mechanism within ZK either.


Instead you'll have to integrate solution outside the war files (e.g. JNDI, redis, ehcache) or a DB to share data between war files.

If the information isn't sensitive you might as well just set a cookie at root path '/' and read the cookie value from both web applications.

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About cookies:

I set sessionCookiePath="/" in <Context> in server.xml How to set and read this cookie value in java?

Thank you!

softteam ( 2020-12-02 22:51:43 +0800 )edit

answered 2020-12-03 15:34:48 +0800

cor3000 gravatar image cor3000
5868 2 7
ZK Team

updated 2020-12-03 15:35:14 +0800

No need to change the session cookie configuration. Instead you add and get your own cookie using HttpServletResponse#addCookie(cookie) & HttpServletRequest#getCookies()

From inside your ZK applications you can get the request and response objects via:

HttpServletRequest request = (HttpServletRequest)Executions.getCurrent().getNativeRequest();

HttpServletResponse response = (HttpServletResponse)Executions.getCurrent().getNativeResponse();
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Asked: 2020-12-01 01:20:37 +0800

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Last updated: Dec 03 '20

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