Gson not working properly in grails but Work in Java Perfectly

[bilalsha]

I written a JsonUtils jar in Java and add it as dependency to Grails application.

I want to convert a json file to object so I wrote this method in JsonUtils class.

    public static <T> T fromJSON(Reader reader, Class<T> theClass) throws IOException {
        // gson is sensitive to white spaces. 1 option is to use gson's JsonReader.setLinient(true).
        // but that will allow malformed json. So, the hack is to read the contents and trim the lines
        StringBuilder sb = new StringBuilder();
        BufferedReader bufferedReader = new BufferedReader(reader);
        for (String line = bufferedReader.readLine(); line != null; line = bufferedReader.readLine()) {
            sb.append(line.trim());
        }
        bufferedReader.close();
        return JSONUtils.fromJSON(sb.toString(), theClass);
    }

   public static <T> T fromJSON(String json, Class<T> theClass) {
        Gson gson = new GsonBuilder().enableComplexMapKeySerialization().create();
        JsonObject jsonObject = new JsonParser().parse(json).getAsJsonObject();
        return gson.fromJson(jsonObject.get(theClass.getName()), theClass);
    }

I wrote a test in java and it was passing correctly converting json file to required object.

Now I use this code in Grails application but when I try to get object it returns null always

DSDescriptor descriptor = JSONUtils.fromJSON(new FileReader(newPath.toFile()), new TypeToken<DSDescriptor>(){}.getType())
        descriptor

However when I use Gson's public <T> T fromJson(Reader json, Class<T> classOfT) throws JsonSyntaxException, JsonIOException method directly in grails application, it parse it correctly.

DSDescriptor descriptor = new Gson().fromJson(new FileReader(newPath.toFile()), DSDescriptor.class)

[JSolutionsCoders]

I'm having the same problem here. Please advise on how did you fix it. Mine it works fine as normal Java program, but it doesn't work when I run it on WebLogic server