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Many behaviors can be specified in the Deployment Descriptor object of each container.
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Transaction management properties: no longer write transaction demarcation in the code - container will implicitly use one of six transaction rules.
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EJB spec suggests, but not requires, you to use Java Transaction Service (JTS) API, the Java binding of the CORBA Object Transaction Service.
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Security: security rules for each bean are defined in a set of AccessControlEntry objects within the deployment descriptor.
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Defines a list of users allowed to access each method
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Or the user may choose to manage their own security programmatically with the java.security package.
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A bean may be moved to any EJB server (for example, for performance reasons).
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