Apache Tomcat: SEVERE: Exception starting filter 'NtlmHttpFilter'

Hi all,

we run Java 1.6.0-b105 and Tomcat 5.5.20 for our Web applications.
We usually use Tomcat's Manager to deploy WAR file.

Now, when deploying a Web application /test, application will NOT automatically be started and we receive the error message 'FAIL - Application at context path /test could not be started'.

Having a look to the Tomcat logs, there is a more detailed message:

"Feb 7, 2007 9:06:15 AM org.apache.catalina.core.StandardContext filterStart
SEVERE: Exception starting filter NtlmHttpFilter
java.lang.NoClassDefFoundError: javax/servlet/Filter".

Filter 'NtlmHttpFilter' is been defined in application's web.xml:

    <filter>        
        <filter-name>NtlmHttpFilter</filter-name>
        <filter-class>jcifs.http.NtlmHttpFilter</filter-class>

        <init-param>
            <param-name>jcifs.netbios.wins</param-name>
            <param-value>[ip addresses]</param-value>
        </init-param>
        <init-param>
            <param-name>jcifs.smb.client.domain</param-name>
            <param-value>[domain name]</param-value>
        </init-param>        
    </filter>

    <filter-mapping>
        <filter-name>NtlmHttpFilter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>

Filter is been used for single sign-on mechanism NTLM as described under: http://jcifs.samba.org/src/docs/ntlmhttpauth.html

What is causing the problem?

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