find & sed (search and replace)

I'm using the following command on my mac: $find . -name “*.java” -exec sed -i ’s/foo/bar/g’ {} \; and it seems to have no effect. I have two files in the directory that end in .java, which both have the foo text in them. Am I missing something? **EDIT : Results from request of comments** [aafghani-03:~/test amirafghani]$ find . -name "*.java" -exec sed -i 's/foo/bar/g' {} \; sed: 1: "./bar.java": invalid command code . sed: 1: "./foo.java": invalid command code .