more generics and prevent NPE

git-svn-id: https://svn.apache.org/repos/asf/maven/shared/trunk@1358529 13f79535-47bb-0310-9956-ffa450edef68
1 file changed
tree: 3a23e434176b20143d05dc6942e6fdc5d7a439a1
  1. src/
  2. pom.xml