overriding this java method, how can I add a new i...

# getting-started

[frogger]

overriding this java method, how can I add a new item to the map?

override fun extractAuthentication(map: MutableMap<String, *>)

e.g. when I want to add a list the compiler says: “Required Any? found List<String>”

[diesieben07]

MutableMap<String, *> means: A map with string values and I don't know what the values are.
If you don't know what the values are, you cannot safely put anything in, because you cannot know if it would fit.

[diesieben07]

Someone could pass in a MutableMap<String, String>. Then you cannot add a List<String> to that.

[frogger]

But I cannot declare/overwrite it differently, can I?

[diesieben07]

No, you can't, but you cannot safely put stuff into this map

[diesieben07]

You say this is a Java method? Whats teh declaration on the Java side?

[Michael de Kaste]

@frogger probably needs a MutableMap<String, Any?> not a MutableMap<String, *>

The former implies you can add anything, the latter implies you can only add the one type we don't know (and thus you can't add anything)