To produce the exception:

---

Mongo mongo = new Mongo("localhost", 27017);
GridFS gfs = new GridFS(mongo.getDB("bucket_test"));
GridFSInputFile file = gfs.createFile("512kb_bucket");
file.setChunkSize(512 * 1024);
OutputStream os = file.getOutputStream();
for (int i=0; i<32 * 1024 * 1024; i++)

{ os.write('.'); }

os.close();
mongo.close();

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It appears that the private _buffer[] in GridFSInputFile.java should be resized as well in the setChunkSize(long _chunkSize) method. Eg.

—
public void setChunkSize(long _chunkSize)

{ if (_outputStream != null || _savedChunks) return; this._chunkSize = _chunkSize; _buffer = new byte[(int) _chunkSize]; // ######## Resize here? ######## }

—