MemoryRealm - BASIC Authentication

[Swapan Mazumdar]

I am trying to implement BASIC authentication for a web app. I am getting following errors. Do I need to create my custom login page and control the validation? I was expecting this to work like windows authentication. Please can anyone help?

2005/11/22 11:58:57 org.apache.catalina.authenticator.FormAuthenticator authenticate
WARNING: Unexpected error forwarding to login page
java.lang.NullPointerException

Following are the entries in the web.xml:
<security-constraint>
<display-name></display-name>
<web-resource-collection>
<web-resource-name>Protected Area</web-resource-name>
<url-pattern>*.jsp</url-pattern>
<url-pattern>*.html</url-pattern>
</web-resource-collection>
<auth-constraint>
<role-name>admin</role-name>
</auth-constraint>
</security-constraint>
<login-config>
<auth-method>BASIC</auth-method>
<realm-name>Basic Authentication Mechanism</realm-name>
</login-config>
<security-role>
<description></description>
<role-name>admin</role-name>
</security-role>

[Renato Losio]

Can you add the error message from the tomcat log file?