Java to Kotlin_ Gson.Json Conversion Error

Question

While converting from java to kotlin the output is given as follows Java:

Gson gson = new Gson();
    String strObj = getIntent().getStringExtra("passdata");
    userDictionery  = gson.fromJson(strObj, Map.class);

Kotlin:

val gson = Gson()
    val strObj = intent.getStringExtra("passdata")
    userDictionery = gson.fromJson<Map<*, *>>(strObj, Map<*, *>::class.java) as Map<String, String>?

But second line in kotlin shows an error that - Only Classes are allowed left hand side of the class literal

variable userDictionery is declared as Map<String, String>

How to resolve this issue?

Lino · Accepted Answer · 2019-05-31 12:24:19Z

1

You can't reference classes with their generic parameters in Kotlin the same way you can't reference them in java. So Map<*, *>::class is in the same way invalid in Kotlin as Map<?, ?>.class is in Java. Replace this:

gson.fromJson<Map<*, *>>(strObj, Map<*, *>::class.java)

With that:

gson.fromJson<Map<*, *>>(strObj, Map::class.java)

answered May 31, 2019 at 12:24

Lino

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1 Comment

SARATH V Over a year ago

thanks for support. I've updated code with non null check also

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