Fix typo

git-svn-id: https://svn.apache.org/repos/asf/tomcat/trunk@1523983 13f79535-47bb-0310-9956-ffa450edef68
Use java.beans.Expression to simplify method and constructor matching/execution. Approach suggested by Esmond Pitt.

git-svn-id: https://svn.apache.org/repos/asf/tomcat/trunk@1523988 13f79535-47bb-0310-9956-ffa450edef68