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Mutual Client Authentication Get Certificate in Servlet
<Connector
 clientAuth="true" port="8443" protocol="HTTP/1.1" SSLEnabled="true"
 scheme="https" secure="true"
 keystoreFile="C:/Users/Kevin Bowersox/Desktop/Development/My Certs/server.jks"
 keystoreType="JKS" keystorePass="notmypassword"
 truststoreFile="C:/Users/Kevin Bowersox/Desktop/Development/My Certs/server.jks"
 truststoreType="JKS" truststorePass="notmypassword"
 SSLVerifyClient="require" SSLVerifyDepth="2" sslProtocol="TLS"
/>

protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
          X509Certificate[] certs = (X509Certificate[]) request.getAttribute("javax.servlet.request.X509Certificate");
            if (null != certs && certs.length > 0) {
                System.out.println("cert found");
            }
            throw new RuntimeException("No X.509 client certificate found in request");
    }

<servlet>
    <description>
    </description>
    <display-name>MyServlet</display-name>
    <servlet-name>MyServlet</servlet-name>
    <servlet-class>MyServlet</servlet-class>
</servlet>
<servlet-mapping>
    <servlet-name>MyServlet</servlet-name>
    <url-pattern>/MyServlet</url-pattern>
</servlet-mapping>

public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
     X509Certificate[] certs = (X509Certificate[]) request.getAttribute("javax.servlet.request.X509Certificate");
        if (null != certs && certs.length > 0) {
            System.out.println("cert found");
        }
        //throw new RuntimeException("No X.509 client certificate found in request");
    chain.doFilter(request, response);
}

<filter>
    <description>
    </description>
    <display-name>MyFilter</display-name>
    <filter-name>MyFilter</filter-name>
    <filter-class>MyFilter</filter-class>
</filter>
<filter-mapping>
    <filter-name>MyFilter</filter-name>
    <url-pattern>*.jsp</url-pattern>
</filter-mapping>