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Ensure that the following JAR files are deployed in the shared lib folder on the application server:

JTA (Java Transaction API)

The JTA specifies standard Java interfaces between a transaction manager and the parties involved in a distributed transaction system: the resource manager, the application server and the transactional applications. Refer to the Sun documentation for more information.
JavaMail classes
Java Beans Activation Framework (for those using Sun JDK 1.5.x only, this is included in JDK 1.6)

All of these JAR files are available in the Crowd Standalone Distribution zip file, available on the Crowd download centre. The files are: activation-1.1.jar, jta-1.0.1B.jar and mail-1.4.jar. You will find them in {CROWD_INSTALL}\apache-tomcat\lib (for Crowd 2.0.2 or later) or in {CROWD_INSTALL}\apache-tomcat\common\lib (for Crowd 2.0.1 or earlier).

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