Do not let logging kill the request on NullNointerException, if principal mappin…

…g has failed and there is no principal.

code/moya-web/src/main/java/fi/codecrew/moya/HostnameFilter.java

@@ -20,6 +20,7 @@ package fi.codecrew.moya;
 
 import java.io.IOException;
 import java.io.PrintWriter;
+import java.security.Principal;
 
 import javax.ejb.EJB;
 import javax.faces.application.ProjectStage;
@@ -33,7 +34,6 @@ import javax.servlet.ServletResponse;
 import javax.servlet.http.HttpServletRequest;
 import javax.servlet.http.HttpServletResponse;
 
-import org.apache.http.HttpRequest;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 import org.slf4j.MDC;
@@ -99,9 +99,15 @@ public class HostnameFilter implements Filter {
 	 * @param authType
 	 */
 	void insertLoggingContext(HttpServletRequest request, AuthType authType) {
-		String userString = request.getUserPrincipal().getName();
+		Principal userPrincipal = request.getUserPrincipal();
+		if (userPrincipal != null) {
+			String userString = userPrincipal.getName();
 			MDC.put("user", userString);
-		MDC.put("authtype", authType.name());
+			MDC.put("authtype", authType != null ? authType.name() : "null");
+		} else {
+			MDC.put("user", "null");
+			MDC.put("authtype", "null");
+		}
 	}
 
 	/**
@@ -154,7 +160,7 @@ public class HostnameFilter implements Filter {
 		}
 		// pass the request along the filter chain
 		try {
-			insertLoggingContext((HttpServletRequest)request, authtype);
+			insertLoggingContext((HttpServletRequest) request, authtype);
 			chain.doFilter(request, response);
 		} catch (Throwable t) {
 			if (AuthType.REST == authtype) {