java.io.StreamCorruptedException：意外的重置； 递归深度1

Question

I'm trying to write to and read from one file with ObjectInputStream and ObjectOutputStream, in two threads. Since I have to append to this file, so according to some online advise, I implement a class:

public class AppendableObjectOutputStream extends ObjectOutputStream {

public AppendableObjectOutputStream(OutputStream out) throws IOException {
    super(out);
}

protected void writeStreamHeader() throws IOException {
    reset();
}
}

And the write logic is like:

synchronized (SDKLogger.failoverFile) {
        FileOutputStream fos = null;
        ObjectOutputStream oos = null;
        try {
            if (failoverFile.exists()) {
                fos = new FileOutputStream(SDKLogger.failoverFile, true);
                oos = new AppendableObjectOutputStream(fos);
            } else {
                fos = new FileOutputStream(SDKLogger.failoverFile, true);
                oos = new ObjectOutputStream(fos);
            }
            for (LogModel log : logs)
                oos.writeObject(log);

Because I have synchronized on the global file only used for this purpose, not referenced anywhere else, I don't understand why I meet this exception always.

java.io.StreamCorruptedException: unexpected reset; recursion depth: 1
at java.io.ObjectInputStream.handleReset(Unknown Source)
at java.io.ObjectInputStream.access$600(Unknown Source)
at java.io.ObjectInputStream$BlockDataInputStream.readBlockHeader(Unknown Source)
at java.io.ObjectInputStream$BlockDataInputStream.refill(Unknown Source)
at java.io.ObjectInputStream$BlockDataInputStream.skipBlockData(Unknown Source)
at java.io.ObjectInputStream.skipCustomData(Unknown Source)
at java.io.ObjectInputStream.readNonProxyDesc(Unknown Source)
at java.io.ObjectInputStream.readClassDesc(Unknown Source)
at java.io.ObjectInputStream.readOrdinaryObject(Unknown Source)
at java.io.ObjectInputStream.readObject0(Unknown Source)
at java.io.ObjectInputStream.readObject(Unknown Source) 

After searching the web, I find almost nothing on what this error is about and why one could come cross this error.

Thanks for your help in advance.

Answer 1

Calling reset() in writeStreamHeader() is completely pointless. You are still constructing the object stream at this point: there is nothing in it to reset yet. It is also obviously the source of this problem. Just remove it.