我想提出一个Android应用程序在那里我有一个双向循环对象树,我需要序列填写BLOB字段中SQLite数据库。 但是默认的系列化实现抛出,在我的StackOverflowError(底部堆栈跟踪)。 但是我在编写自定义Java序列化代码,以避免这种情况的经验。
我这个线程( 的StackOverflowError序列化Java中的对象的时候 ),他谈到了问题,而是如何实现它在我的情况我真的没有任何想法:
这是可能的,以限定用于这样的列表类,当第一链路是串行化的,简单地行走的列表,并迭代地串行化每个链路一个writeObject()方法; 这将阻止默认递归机制被使用。
这是我的对象模型(看1 / M,而不是其他标志):
这是我使用序列化对象模型为字节阵列(正确并不重要)的方法:
public byte[] serialize(Object object) {
byte[] buf = null;
try {
ByteArrayOutputStream bos = new ByteArrayOutputStream();
ObjectOutput out = new ObjectOutputStream(bos);
out.writeObject(object);
out.close();
buf = bos.toByteArray();
} catch (IOException e) {
e.printStackTrace();
}
return buf;
}
自定义序列化功能:
private void writeObject(java.io.ObjectOutputStream out) throws IOException {
//please help me with this code
}
private void readObject(java.io.ObjectInputStream in) throws IOException, ClassNotFoundException {
//please help me with this code
}
希望有人能帮助我得到这个问题解决了。 任何线索是表示赞赏。
异常堆栈跟踪:
05-25 20:28:16.231: E/AndroidRuntime(14451): FATAL EXCEPTION: main
05-25 20:28:16.231: E/AndroidRuntime(14451): java.lang.StackOverflowError
05-25 20:28:16.231: E/AndroidRuntime(14451): at java.util.IdentityHashMap.findIndex(IdentityHashMap.java:419)
05-25 20:28:16.231: E/AndroidRuntime(14451): at java.util.IdentityHashMap.get(IdentityHashMap.java:371)
05-25 20:28:16.231: E/AndroidRuntime(14451): at java.io.ObjectOutputStream.dumpCycle(ObjectOutputStream.java:471)
05-25 20:28:16.231: E/AndroidRuntime(14451): at java.io.ObjectOutputStream.writeObjectInternal(ObjectOutputStream.java:1739)
05-25 20:28:16.231: E/AndroidRuntime(14451): at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:1689)
05-25 20:28:16.231: E/AndroidRuntime(14451): at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:1653)
05-25 20:28:16.231: E/AndroidRuntime(14451): at java.io.ObjectOutputStream.writeFieldValues(ObjectOutputStream.java:1143)
05-25 20:28:16.231: E/AndroidRuntime(14451): at java.io.ObjectOutputStream.defaultWriteObject(ObjectOutputStream.java:413)
05-25 20:28:16.231: E/AndroidRuntime(14451): at java.io.ObjectOutputStream.writeHierarchy(ObjectOutputStream.java:1241)
05-25 20:28:16.231: E/AndroidRuntime(14451): at java.io.ObjectOutputStream.writeNewObject(ObjectOutputStream.java:1575)
05-25 20:28:16.231: E/AndroidRuntime(14451): at java.io.ObjectOutputStream.writeObjectInternal(ObjectOutputStream.java:1847)
05-25 20:28:16.231: E/AndroidRuntime(14451): at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:1689)
05-25 20:28:16.231: E/AndroidRuntime(14451): at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:1653)
05-25 20:28:16.231: E/AndroidRuntime(14451): at java.io.ObjectOutputStream.writeFieldValues(ObjectOutputStream.java:1143)
05-25 20:28:16.231: E/AndroidRuntime(14451): at java.io.ObjectOutputStream.defaultWriteObject(ObjectOutputStream.java:413)
05-25 20:28:16.231: E/AndroidRuntime(14451): at java.io.ObjectOutputStream.writeHierarchy(ObjectOutputStream.java:1241)
05-25 20:28:16.231: E/AndroidRuntime(14451): at java.io.ObjectOutputStream.writeNewObject(ObjectOutputStream.java:1575)
05-25 20:28:16.231: E/AndroidRuntime(14451): at java.io.ObjectOutputStream.writeObjectInternal(ObjectOutputStream.java:1847)
05-25 20:28:16.231: E/AndroidRuntime(14451): at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:1689)
05-25 20:28:16.231: E/AndroidRuntime(14451): at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:1653)
05-25 20:28:16.231: E/AndroidRuntime(14451): at java.util.ArrayList.writeObject(ArrayList.java:651)
05-25 20:28:16.231: E/AndroidRuntime(14451): at java.lang.reflect.Method.invokeNative(Native Method)
05-25 20:28:16.231: E/AndroidRuntime(14451): at java.lang.reflect.Method.invoke(Method.java:507)
05-25 20:28:16.231: E/AndroidRuntime(14451): at java.io.ObjectOutputStream.writeHierarchy(ObjectOutputStream.java:1219)
05-25 20:28:16.231: E/AndroidRuntime(14451): at java.io.ObjectOutputStream.writeNewObject(ObjectOutputStream.java:1575)
05-25 20:28:16.231: E/AndroidRuntime(14451): at java.io.ObjectOutputStream.writeObjectInternal(ObjectOutputStream.java:1847)
05-25 20:28:16.231: E/AndroidRuntime(14451): at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:1689)
05-25 20:28:16.231: E/AndroidRuntime(14451): at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:1653)
05-25 20:28:16.231: E/AndroidRuntime(14451): at java.io.ObjectOutputStream.writeFieldValues(ObjectOutputStream.java:1143)
05-25 20:28:16.231: E/AndroidRuntime(14451): at java.io.ObjectOutputStream.defaultWriteObject(ObjectOutputStream.java:413)
05-25 20:28:16.231: E/AndroidRuntime(14451): at java.io.ObjectOutputStream.writeHierarchy(ObjectOutputStream.java:1241)
05-25 20:28:16.231: E/AndroidRuntime(14451): at java.io.ObjectOutputStream.writeNewObject(ObjectOutputStream.java:1575)
05-25 20:28:16.231: E/AndroidRuntime(14451): at java.io.ObjectOutputStream.writeObjectInternal(ObjectOutputStream.java:1847)
05-25 20:28:16.231: E/AndroidRuntime(14451): at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:1689)
05-25 20:28:16.231: E/AndroidRuntime(14451): at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:1653)
05-25 20:28:16.231: E/AndroidRuntime(14451): at java.io.ObjectOutputStream.writeFieldValues(ObjectOutputStream.java:1143)
05-25 20:28:16.231: E/AndroidRuntime(14451): at java.io.ObjectOutputStream.defaultWriteObject(ObjectOutputStream.java:413)
05-25 20:28:16.231: E/AndroidRuntime(14451): at java.io.ObjectOutputStream.writeHierarchy(ObjectOutputStream.java:1241)
05-25 20:28:16.231: E/AndroidRuntime(14451): at java.io.ObjectOutputStream.writeNewObject(ObjectOutputStream.java:1575)
05-25 20:28:16.231: E/AndroidRuntime(14451): at java.io.ObjectOutputStream.writeObjectInternal(ObjectOutputStream.java:1847)
05-25 20:28:16.231: E/AndroidRuntime(14451): at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:1689)
05-25 20:28:16.231: E/AndroidRuntime(14451): at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:1653)
05-25 20:28:16.231: E/AndroidRuntime(14451): at java.util.ArrayList.writeObject(ArrayList.java:651)
05-25 20:28:16.231: E/AndroidRuntime(14451): at java.lang.reflect.Method.invokeNative(Native Method)
05-25 20:28:16.231: E/AndroidRuntime(14451): at java.lang.reflect.Method.invoke(Method.java:507)
05-25 20:28:16.231: E/AndroidRuntime(14451): at java.io.ObjectOutputStream.writeHierarchy(ObjectOutputStream.java:1219)
05-25 20:28:16.231: E/AndroidRuntime(14451): at java.io.ObjectOutputStream.writeNewObject(ObjectOutputStream.java:1575)
05-25 20:28:16.231: E/AndroidRuntime(14451): at java.io.ObjectOutputStream.writeObjectInternal(ObjectOutputStream.java:1847)
05-25 20:28:16.231: E/AndroidRuntime(14451): at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:1689)
05-25 20:28:16.231: E/AndroidRuntime(14451): at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:1653)
05-25 20:28:16.231: E/AndroidRuntime(14451): at java.io.ObjectOutputStream.writeFieldValues(ObjectOutputStream.java:1143)
05-25 20:28:16.231: E/AndroidRuntime(14451): at java.io.ObjectOutputStream.defaultWriteObject(ObjectOutputStream.java:413)
05-25 20:28:16.231: E/AndroidRuntime(14451): at java.io.ObjectOutputStream.writeHierarchy(ObjectOutputStream.java:1241)
05-25 20:28:16.231: E/AndroidRuntime(14451): at java.io.ObjectOutputStream.writeNewObject(ObjectOutputStream.java:1575)
05-25 20:28:16.231: E/AndroidRuntime(14451): at java.io.ObjectOutputStream.writeObject