Enabling J2EE Sessions in Java

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Enabling J2EE Sessions
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J2EE sessions are easily enabled and require no changes in coding to use them. You find an option in the CF MX Administrator under the Server Settings heading, Memory Variables link. Select the Use J2EE Sessions check box. Although the screen doesn t say so, you need to restart the CF MX server before the change takes effect. After J2EE sessions are enabled, they affect all code in all applications on the server that use <cfapplication sessionmanagement= yes >. No other change to the application code is necessary. This feature, by the way, works in both the Enterprise and Professional Editions of ColdFusion MX.
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New SessionIDs
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After enabling J2EE sessions and restarting the server, you notice (if you have server debugging displayed or use <cfdump var= #session# >, for example) that the values shown for
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28 Integrating ColdFusion MX and Java
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session variables reflect new information. First, without J2EE sessions enabled, the value of the session variable sessionid may look as follows:
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sessionid=_2704_73826960
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This reflects a combination of the cfid and cftoken, which are the keys that have enabled session support prior to J2EE sessions. With J2EE sessions enabled, it instead appears in the following format:
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sessionid=8030584681031438559214
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This reflects a key change from using the old cfid/cftoken pair for supporting sessions to using a new single 22-digit number. We discuss the security benefits of that later in this chapter. Second, you observe that the session variable urltoken also reflects new information. Without J2EE sessions, urltoken may look as follows:
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urltoken=cfid=2704&cftoken=73826960
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But with J2EE sessions enabled, it shows a new jsessionid value (rather than sessionid) appended to the end of the string, as in the following example:
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urltoken=cfid=2704&cftoken=73826960&jsessionid=8030584681031438559214
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This urltoken is formed as a query string, and it or jsessionid are used in supporting browsers that don t enable cookies. (You find more information about that later in this chapter.). Finally, yet another difference is that, without J2EE sessions enabled, you also have cfid and cftoken variables in the session scope. But if you enable J2EE sessions, those no longer exist. It makes sense, because the sessionid is that 22-digit number. The cfid and cftoken still exist in the cookie scope, but be aware that, if you have code that refers to session.cfid or session.cftoken, that no longer works with J2EE sessions enabled.
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Benefits of J2EE sessions
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The change in format of the urltoken and jsessionid variables is key to enabling J2EE sessions, but it s not really an apparent benefit. Still, a couple aspects of the change are indeed beneficial. First, the change to a 22-digit number for the sessionid has a security benefit. Sessions are generally supported by way of two cookie variables: cfid and cftoken. Sessions can also be supported by passing those variables on the query string in a URL (which, again, is the purpose of the urltoken). But the value of the cfid and cftoken variables being such small numbers makes them rather easy to guess. If your J2EE sessions are using a much longer value for the sessionid, the chances are reduced that the jsessionid or urltoken values can be randomly guessed if presented as either cookie or URL variables.
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Note You can attain increased security regarding the simplicity of cftoken values, without enabling J2EE sessions, by using another new feature in CF MX that enables you to ask the server to generate more elaborate UUIDs (universally unique identifiers) for the cftoken. This is enabled in the CF Administrator, on the Server Settings page, by selecting the Use UUID for cftoken check box. As you do in enabling J2EE sessions, you need to restart the CF MX server for this change to take effect but do not need to change any code to benefit from the new feature.
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