$ cat AmbiguousVarArgs.java public class AmbiguousVarArgs { public static void main(String[] args) { String[] ss = { "XYZ" }; foo(ss); } static <T> void foo(T... xs) { System.out.println(xs); } } $ javac AmbiguousVarArgs.java Note: AmbiguousVarArgs.java uses unchecked or unsafe operations. Note: Recompile with -Xlint:unchecked for details. $ javac -Xlint:unchecked AmbiguousVarArgs.java AmbiguousVarArgs.java:7: warning: [unchecked] Possible heap pollution from parameterized vararg type T static <T> void foo(T... xs) { ^ where T is a type-variable: T extends Object declared in method <T>foo(T...) 1 warning $ java AmbiguousVarArgs [Ljava.lang.String;@7852e922