The SingleSignOutFilter can affect character encoding. This becomes most obvious when used in conjunction with Confluence. Its recommended you explicitly configure either the VT Character Encoding Filter or the Spring Character Encoding Filter with explicit encodings.

The Single Sign Out support in CAS consists of configuring one filter and one ContextListener. Please note that if you have configured the CAS Client for Java as Web filters, this filter must come before the other filters as described on the preceding page

Add the following configuration to your web.xml where appropriate:

With CAS 2.0 Protocol

<filter>
   <filter-name>CAS Single Sign Out Filter</filter-name>
   <filter-class>org.jasig.cas.client.session.SingleSignOutFilter</filter-class>
</filter>
...
<filter-mapping>
   <filter-name>CAS Single Sign Out Filter</filter-name>
   <url-pattern>/*</url-pattern>
</filter-mapping>
...
<listener>
	<listener-class>org.jasig.cas.client.session.SingleSignOutHttpSessionListener</listener-class>
</listener>

With SAML 1.1 Protocol

<filter>
   <filter-name>CAS Single Sign Out Filter</filter-name>
   <filter-class>org.jasig.cas.client.session.SingleSignOutFilter</filter-class>
   <init-param>
      <param-name>artifactParameterName</param-name>
      <param-value>SAMLart</param-value>
   </init-param>
</filter>
...
<filter-mapping>
   <filter-name>CAS Single Sign Out Filter</filter-name>
   <url-pattern>/*</url-pattern>
</filter-mapping>
...
<listener>
	<listener-class>org.jasig.cas.client.session.SingleSignOutHttpSessionListener</listener-class>
</listener>