Can we use StringBuffer class instead of StringBuilder?

[elizabethoswald]

Hi, In the src/client/java/teammates/client/scripts/ListActiveInstructors.java, can we use StringBuffer class instead of StringBuilder as the StringBuffer class is thread-safe one?

[slraina]

Hi @elizabethoswald sorry to post it here since i don't know where to,
Actually this is the first project, i forked and cloned, But now i have absolutely no idea how to proceed further. Please help me!

[cedricongjh]

see: #13055 (comment)