Gson throws MalformedJsonException, and other Exceptions

I tried to save data to json string in a txt file using Gson and then restore it using Gson either. Things go well if I do it in eclipse. But when packaged to jar, Gson throws Exceptions.

Here is the code for saving the file.

String gsonStr = gson.toJson(masterShips);  // masterShips is ArrayList<Ship>
BufferedWriter writer = null;
try {
    writer = new BufferedWriter(new FileWriter("D:\master_ship.txt"));
    writer.write(gsonStr);
} catch (IOException e) {
    System.err.println(e);
} finally {
    if (writer != null) {
        try {
            writer.close();
        } catch (IOException e) {
            System.err.println(e);
        }
    }
}

Then I read the file in eclipse using this code (and it works):

Scanner in = new Scanner(new FileReader("D:\master_ship.txt"));

String str = in.nextLine();
Log.toDebug(str);
in.close();
JsonParser parser = new JsonParser();
JsonElement je = parser.parse(str);
JsonArray ja = je.getAsJsonArray();
for (int i=0; i<ja.size(); ++i) { 
    ... 
}

But after packaged into jar and run in cmd, Exception occurs:

Exception in thread "main" com.google.gson.JsonSyntaxException: com.google.gson.
stream.MalformedJsonException: Use JsonReader.setLenient(true) to accept malform
ed JSON at line 1 column 4
        at com.google.gson.JsonParser.parse(JsonParser.java:65)
        at com.google.gson.JsonParser.parse(JsonParser.java:45)
        at kan.util.Master.loadMasterShip(Master.java:44)
        at kan.util.Master.load(Master.java:27)
        at kan.Main.main(Main.java:22)
Caused by: com.google.gson.stream.MalformedJsonException: Use JsonReader.setLeni
ent(true) to accept malformed JSON at line 1 column 4
        at com.google.gson.stream.JsonReader.syntaxError(JsonReader.java:1505)
        at com.google.gson.stream.JsonReader.checkLenient(JsonReader.java:1386)
        at com.google.gson.stream.JsonReader.doPeek(JsonReader.java:531)
        at com.google.gson.stream.JsonReader.peek(JsonReader.java:414)
        at com.google.gson.JsonParser.parse(JsonParser.java:60)
        ... 4 more

According to the hint of the Exception, I changed my code and it still works in eclipse:

Scanner in = new Scanner(new FileReader("D:\master_ship.txt"));

String str = in.nextLine();
in.close();

Reader reader = new StringReader(str);
JsonReader jr = new JsonReader(reader);
jr.setLenient(true);
JsonParser parser = new JsonParser();
JsonElement je = parser.parse(jr);
JsonArray ja = je.getAsJsonArray();
for (int i=0; i<ja.size(); ++i) { 
... 
}

But jar failed and throws

Exception in thread "main" java.lang.IllegalStateException: This is not a JSON A
rray.
    at com.google.gson.JsonElement.getAsJsonArray(JsonElement.java:106)
    at kan.util.Master.loadMasterShip(Master.java:58)
    at kan.util.Master.load(Master.java:30)
    at kan.Main.main(Main.java:22)

As suggested by Sotirios I cut the length of the arraylist down, and when I increase the number of ships to 4, things go wrong. Here is the json:

[{"id":1,"name":"睦月","type":2,"rank":2,"fuelMax":15,"bulletMax":15,"slotNum":2,"speed":10,"afterLv":20,"afterId":254,"range":1,"powerups":[1,1,0,0]},{"id":2,"name":"如月","type":2,"rank":1,"fuelMax":15,"bulletMax":15,"slotNum":2,"speed":10,"afterLv":20,"afterId":255,"range":1,"powerups":[0,1,0,0]},{"id":6,"name":"長月","type":2,"rank":1,"fuelMax":15,"bulletMax":15,"slotNum":2,"speed":10,"afterLv":20,"afterId":258,"range":1,"powerups":[0,1,0,0]},{"id":7,"name":"三日月","type":2,"rank":1,"fuelMax":15,"bulletMax":15,"slotNum":2,"speed":10,"afterLv":20,"afterId":260,"range":1,"powerups":[0,1,0,0]}]
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             ↑ colunm 473

Exception in thread "main" com.google.gson.JsonSyntaxException: com.google.gson.
stream.MalformedJsonException: Unterminated object at line 1 column 473
        at com.google.gson.internal.Streams.parse(Streams.java:56)
        at com.google.gson.JsonParser.parse(JsonParser.java:84)
        at kan.util.Master.loadMasterShip(Master.java:55)
        at kan.util.Master.load(Master.java:30)
        at kan.Main.main(Main.java:22)
Caused by: com.google.gson.stream.MalformedJsonException: Unterminated object at
 line 1 column 473
        at com.google.gson.stream.JsonReader.syntaxError(JsonReader.java:1505)
        at com.google.gson.stream.JsonReader.doPeek(JsonReader.java:480)
        at com.google.gson.stream.JsonReader.hasNext(JsonReader.java:403)
        at com.google.gson.internal.bind.TypeAdapters$25.read(TypeAdapters.java:
666)
        at com.google.gson.internal.bind.TypeAdapters$25.read(TypeAdapters.java:
659)
        at com.google.gson.internal.bind.TypeAdapters$25.read(TypeAdapters.java:
642)
        at com.google.gson.internal.Streams.parse(Streams.java:44)
        ... 4 more

Can anyone help me with this, you will be reaally preciated!