fromJson returns null for empty string

[GoogleCodeExporter]

What steps will reproduce the problem?

public void testCase() {
        String json = "";
        final Map<String, String> cachedMap = new Gson().fromJson(json, new TypeToken<Map<String, String>>() {}.getType());
        assertNotNull(cachedMap);
    }

What is the expected output? What do you see instead?

It probably should throw an exception (JsonParseException or maybe a Syntax 
one).

What version of the product are you using? On what operating system?

2.2.4, Ubuntu 12.10 and Android 4.3

Please provide any additional information below.

Original issue reported on code.google.com by da...@swiftkey.com on 30 Oct 2013 at 4:39

[GoogleCodeExporter]

[deleted comment]

[GoogleCodeExporter]

Might be duplicated : https://code.google.com/p/google-gson/issues/detail?id=457

Original comment by yancheng...@gmail.com on 9 Jan 2014 at 10:28

[darktiny]

Is there a plan to fix this issue?

[JakeWharton]

No. This is a side-effect of historical and bad behavior of the Gson object setting leniency by default. Changing this would be backwards-incompatible.

You can look up a TypeAdapter and use it directly to get Gson to behave sanely.

Gson gson = new Gson();
TypeAdapter<String> adapter = gson.getAdapter(String.class);
try {
  String json = "";
  String result = adapter.fromJson(json);
  System.out.println("SUCCEEDED " + result);
} catch (IOException e) {
  System.out.println("FAILED " + e.getClass().getSimpleName() + ": " + e.getMessage());
}

FAILED EOFException: End of input at line 1 column 1