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The YaleCasFilteredContext is an IYaleCasContext implementation which consumes the results of the CASValidateFilter having performed the actual authentication.
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You'll need to configure the security context in your security.properties file and configure the CASValidateFilter in your web.xml.
Setting the security.properties
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In your web.xml, you need to map and configure the CASValidateFilter and a helper filter which provides a static cache so that the YaleCasFilteredContext can obtain the CASReceipt bearing the results of the authentication.
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