使用ObjectInputStream时Android上的StackOverflowError

Question

我正在开发一个Android项目，我正在尝试使用objectOutputStream将Trie保存到文件中，然后能够重新读取它。由于某种原因，我不断得到StackOverFlowError，即使在我的特里有三个字。

尝试代码：http://algs4.cs.princeton.edu/52trie/TST.java.html

这是我的读/写代码

public static void writeObject(Context c, String key, Object object)
{
    try{
        FileOutputStream fileOutputStream = c.openFileOutput(key, Context.MODE_PRIVATE);
        ObjectOutputStream objectOutputStream = new ObjectOutputStream(fileOutputStream);
        objectOutputStream.writeObject(object);
        objectOutputStream.close();
        fileOutputStream.close();
    } catch(IOException e) {}


}

public static Object readObject(Context c, String key)
{
    Object object = null;
    try{
        FileInputStream fileInputStream = c.openFileInput(key);
        try{
        ObjectInputStream objectInputStream = new ObjectInputStream(fileInputStream);
        try{
        object = objectInputStream.readObject();}
        catch (ClassNotFoundException e) {}
        ;} catch (IOException e) {}

    } catch (FileNotFoundException e) {}
    return object;
}

这是我得到的错误。 3字Trie不应该导致堆栈溢出错误。

java.lang.StackOverflowError
            at java.lang.Thread.currentThread(Thread.java:476)
            at java.lang.ThreadLocal.get(ThreadLocal.java:53)
            at dalvik.system.BlockGuard.getThreadPolicy(BlockGuard.java:140)
            at libcore.io.BlockGuardOs.read(BlockGuardOs.java:148)
            at libcore.io.IoBridge.read(IoBridge.java:422)
            at java.io.FileInputStream.read(FileInputStream.java:179)
            at libcore.io.Streams.readSingleByte(Streams.java:41)
            at java.io.FileInputStream.read(FileInputStream.java:175)
            at java.io.DataInputStream.readByte(DataInputStream.java:96)
            at java.io.ObjectInputStream.nextTC(ObjectInputStream.java:506)
            at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:680)
            at java.io.ObjectInputStream.readNewObject(ObjectInputStream.java:1799)
            at java.io.ObjectInputStream.readNonPrimitiveContent(ObjectInputStream.java:787)
            at java.io.ObjectInputStream.readObject(ObjectInputStream.java:1999)
            at java.io.ObjectInputStream.readObject(ObjectInputStream.java:1956)
            at java.io.ObjectInputStream.readFieldValues(ObjectInputStream.java:1137)
            at java.io.ObjectInputStream.defaultReadObject(ObjectInputStream.java:455)
            at java.io.ObjectInputStream.readObjectForClass(ObjectInputStream.java:1369)
            at java.io.ObjectInputStream.readHierarchy(ObjectInputStream.java:1266)
            at java.io.ObjectInputStream.readNewObject(ObjectInputStream.java:1851)
            at java.io.ObjectInputStream.readNonPrimitiveContent(ObjectInputStream.java:787)
            at java.io.ObjectInputStream.readObject(ObjectInputStream.java:1999)
            at java.io.ObjectInputStream.readObject(ObjectInputStream.java:1956)
            at java.io.ObjectInputStream.readFieldValues(ObjectInputStream.java:1137)
            at java.io.ObjectInputStream.defaultReadObject(ObjectInputStream.java:455)
            at java.io.ObjectInputStream.readObjectForClass(ObjectInputStream.java:1369)
            at java.io.ObjectInputStream.readHierarchy(ObjectInputStream.java:1266)
            at java.io.ObjectInputStream.readNewObject(ObjectInputStream.java:1851)
            at java.io.ObjectInputStream.readNonPrimitiveContent(ObjectInputStream.java:787)
            at java.io.ObjectInputStream.readObject(ObjectInputStream.java:1999)
            at java.io.ObjectInputStream.readObject(ObjectInputStream.java:1956)
            at java.io.ObjectInputStream.readFieldValues(ObjectInputStream.java:1137)
            at java.io.ObjectInputStream.defaultReadObject(ObjectInputStream.java:455)
            at java.io.ObjectInputStream.readObjectForClass(ObjectInputStream.java:1369)
            at java.io.ObjectInputStream.readHierarchy(ObjectInputStream.java:1266)
            at java.io.ObjectInputStream.readNewObject(ObjectInputStream.java:1851)
            at java.io.ObjectInputStream.readNonPrimitiveContent(ObjectInputStream.java:787)
            at java.io.ObjectInputStream.readObject(ObjectInputStream.java:1999)
            at java.io.ObjectInputStream.readObject(ObjectInputStream.java:1956)
            at java.io.ObjectInputStream.readFieldValues(ObjectInputStream.java:1137)
            at java.io.ObjectInputStream.defaultReadObject(ObjectInputStream.java:455)
            at java.io.ObjectInputStream.readObjectForClass(ObjectInputStream.java:1369)
            at java.io.ObjectInputStream.readHierarchy(ObjectInputStream.java:1266)
            at java.io.ObjectInputStream.readNewObject(ObjectInputStream.java:1851)
            at java.io.ObjectInputStream.readNonPrimitiveContent(ObjectInputStream.java:787)
            at java.io.ObjectInputStream.readObject(ObjectInputStream.java:1999)
            at java.io.ObjectInputStream.readObject(ObjectInputStream.java:1956)
            at java.io.ObjectInputStream.readFieldValues(ObjectInputStream.java:1137)
            at java.io.ObjectInputStream.defaultReadObject(ObjectInputStream.java:455)
            at java.io.ObjectInputStream.readObjectForClass(ObjectInputStream.java:1369)
            at java.io.ObjectInputStream.readHierarchy(ObjectInputStream.java:1266)
            at java.io.ObjectInputStream.readNewObject(ObjectInputStream.java:1851)
            at java.io.ObjectInputStream.readNonPrimitiveContent(ObjectInputStream.java:787)
            at java.io.ObjectInputStream.readObject(ObjectInputStream.java:1999)
            at java.io.ObjectInputStream.readObject(ObjectInputStream.java:1956)
            at java.io.ObjectInputStream.readFieldValues(ObjectInputStream.java:1137)
            at java