mongodb java driver：com.mongodb.MongoException: can't find a chunk -

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//to download files according filename //the arraylist list of filename

i wondering if there has faced same issue , resolved it.

 try {    mongo mongo = new mongo("10.16.66.107", 27017);          db db = mongo.getdb("vt_dbfile");         (int = 0; < arraylist.size(); i++) {             string dbfilename = arraylist.get(i);             gridfs gridfs = new gridfs(db, "fs");             gridfsdbfile imageforoutput = gridfs.findone(dbfilename);             imageforoutput.writeto("d:\\download_type"  +"\\"+ arraylist.get(i));         }     } catch (exception e) {         // todo: handle exception         e.printstacktrace();     }

exception:

com.mongodb.mongoexception: can't find chunk!  file id: 56aa7a5665cd34935812aae5 chunk: 0     @ com.mongodb.gridfs.gridfsdbfile.getchunk(gridfsdbfile.java:65)     @ com.mongodb.gridfs.gridfsdbfile.writeto(gridfsdbfile.java:53)     @ com.mongodb.gridfs.gridfsdbfile.writeto(gridfsdbfile.java:46)     @ com.mongodb.gridfs.gridfsdbfile.writeto(gridfsdbfile.java:43)     @ com.vt.query.vtdownload.vtdownload(vtdownload.java:21)


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