gson throws MalformedJsonException

Question

I m using gson to convert a json string to a Java-Object  The value of result2 is exactly the same as the value of result1   Copied from debugger  Backslashs added   The following exception is thrown while converting result1  com google gson JsonSyntaxException  com google gson stream MalformedJsonException  Expected EOF at line 1 column 170  Converting result2 works fine   The json string is valid according to jsonlint com   public static Userinfo getUserinfo         String result1   http POST  https   www bitstamp net api balance                                    postdata  true       String result2       btc reserved      0      fee      0 5000      btc available      0 10000000      usd reserved      0      btc balance      0 10000000      usd balance      30 00      usd available      30 00          Gson gson   new Gson        Userinfo userinfo1   gson fromJson result1  Userinfo class     throws Exception     Userinfo userinfo2   gson fromJson result2  Userinfo class     works fine      return userinfo1    private class Userinfo        public Userinfo               public float usd balance      public float btc balance       public float usd reserved      public float btc reserved      public float usd available      public float btc available      public float fee      public float last update

User · Answer

From my recent experience  JsonReader setLenient basically makes the parser very tolerant  even to allow malformed JSON data   But for certain data retrieved from your trusted RESTful API s   this error might be caused by trailing white spaces  In such cases  simply trim the data would avoid the error   String trimmed   result1 trim      Then gson fromJson trimmed  T  might work  Surely this only covers a special case  so YMMV

User · Answer

I suspect that result1 has some characters at the end of it that you can t see in the debugger that follow the closing   character  What s the length of result1 versus result2  I ll note that result2 as you ve quoted it has 169 characters   GSON throws that particular error when there s extra characters after the end of the object that aren t whitespace  and it defines whitespace very narrowly  as the JSON spec does  - only  t   n   r  and space count as whitespace  In particular  note that trailing NUL   0  characters do not count as whitespace and will cause this error   If you can t easily figure out what s causing the extra characters at the end and eliminate them  another option is to tell GSON to parse in lenient mode   Gson gson   new Gson    JsonReader reader   new JsonReader new StringReader result1    reader setLenient true   Userinfo userinfo1   gson fromJson reader  Userinfo class

User · Answer

In the debugger you don t need to add back slashes  the input field understands the special chars   In java code you need to escape the special chars

[java] gson throws MalformedJsonException

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