public class VkCursor extends AbstractWindowedCursor implements Serializable {
	private static final long serialVersionUID = 1L;
	protected CursorWindow mWindow;
	protected int mPos;
	private int mCount = NO_COUNT;

......

	private void writeObject(ObjectOutputStream stream) throws IOException {
		stream.writeLong(serialVersionUID);
    		if (mWindow!=null)
	        try {
	        	mWindow.acquireReference();

	        	int startPosition = mWindow.getStartPosition();
	        	stream.writeInt(startPosition);
	        	int numRows = mWindow.getNumRows();
	        	stream.writeInt(numRows);
	        	stream.writeInt(mPos);
	        	stream.writeInt(mCount);

	        	for(int pos=startPosition; pos<numRows; pos++) {
	        		// write _id
	       			long _id = mWindow.getLong(pos, 0);
	        		stream.writeLong(_id);
	        		// write Object  
	        		byte[] bs = mWindow.getBlob(pos, 1);
	        		int length = bs.length;
	        		stream.writeInt(length);
	        		stream.write(bs, 0, length);
	        	}
	        } finally {
	        	mWindow.releaseReference();
	        }
	}
    

	private void readObject(ObjectInputStream stream) throws Exception { 
    		final long version = stream.readLong();
	    	if (version==1L) {
            		if (mWindow == null) {
                		mWindow = new CursorWindow(true);
		        } else {
                		mCursorState++;
                		queryThreadLock();
	                	try {
        	        		mWindow.clear();
                		} finally {
                			queryThreadUnlock();
	                	}
        	    	}
			try {
		            	mWindow.acquireReference();
            	
            			int startPos = stream.readInt();
		            	mWindow.setStartPosition(startPos);
	        		int numRows = stream.readInt();
	        		mPos = stream.readInt();
		        	mCount = stream.readInt();

		        	mWindow.setNumColumns(2);
	        		for(int pos=startPos; pos<numRows; pos++) {
	        			boolean alloc = mWindow.allocRow();
			       		if (!alloc) {
	       				    	throw new Exception(String.format("Failed allocating fieldDir at startPos %d row %d", startPos, numRows));
			       		}
	       				// read _id
			       		long _id = stream.readLong();
	       				mWindow.putLong(_id, pos, 0);
			       		// read Object
	        			int length = stream.readInt();
		        		byte[] bs = new byte[length];
		                	stream.read(bs, 0, length);
	        	        	mWindow.putBlob(bs, pos, 1);
	        		}        	
            	
		        } finally {
		        	mWindow.releaseReference();
	        	}
		} 	
	}
}

       		byte[] bs = mWindow.getBlob(pos, 1);
        	int length = bs.length;
        	stream.writeInt(length);
        	stream.write(bs, 0, length);

        	int length = stream.readInt();
	      	byte[] bs = new byte[length];
	        stream.read(bs, 0, length);
	        mWindow.putBlob(bs, pos, 1);

// read Object
int length = stream.readInt();
byte[] bs = new byte[length];
stream.readFully(bs, 0, length); // Вместо stream.read(bs, 0, length)
mWindow.putBlob(bs, pos, 1);