"Reflection.java uses unchecked or unsafe operations"

[tssm]

I just installed it, but when I try to use it Vim suspends itself and displays this error:

Note: ftbundle/java/complete/autoload/Reflection.java uses unchecked or unsafe operations.
Note: Recompile with -Xlint:unchecked for details.

Press ENTER or type command to continue

I'm running it on Mac OS X Mavericks.

$ java -version
java version "1.6.0_65"
Java(TM) SE Runtime Environment (build 1.6.0_65-b14-462-11M4609)
Java HotSpot(TM) 64-Bit Server VM (build 20.65-b04-462, mixed mode)

[mhdirkse]

I got the same text, but it was a warning. When I pressed Ctrl-X Ctrl-O, I saw the following:

As-MacBook-Pro:tryvim martijndirkse$ vim SomeClass.java

[No write since last change]
Note: /Users/martijndirkse/.vim/autoload/Reflection.java uses unchecked or unsafe operations.
Note: Recompile with -Xlint:unchecked for details.

Press ENTER or type command to continue

After this, I could use auto completion as I wanted.

I am working on MacOS Sierra, version 10.12.2 and my Java version is 1.7.0_80.