範例

public static class SerializableObject implements Serializable{

synchronized private void readObject(ObjectInputStream s) throws IOException, ClassNotFoundException {
s.defaultReadObject();
}
}

解決方案
宣告不含 synchronized 修飾元的 readObject()

public static class SerializableObject implements Serializable{

private void readObject(ObjectInputStream s) throws IOException, ClassNotFoundException {
s.defaultReadObject();
}
}