Injection.invert[String, Array[Byte]](Array[Byte](1, 2, 3, -1, -2, -127)) produces a string that cannot be inverted back

[ashwinraghav]

[johnynek]

I think we need to validate that the byte string is valid UTF-8. It seems Java does not by default. That is really surprising. Why String does not throw an exception is really beyond me here.

[ashwinraghav]

One way to fix this is discussed here
TLDR;

(new String(Array[Byte](1,2,3,-1,-2,-127).map(_.toChar))).toCharArray.map(_.toByte)

Don't depend on an encoding. Before the transformation, convert to characters arrays.
The string constructor applies no encoding to char arrays.

[ianoc]

Thats not going to be correct for characters which take more than one byte though is it?

[mosesn]

Java lets you report failures in other ways.

[johnynek]

@mosesn that looks like the way to go.