When processing pbf file with splitter on single processor computer, processing never finishes. If my guess is correct, the problem is in the endMap function of the SplitProcessor class. Process hangs on line 176 because of blocking of the toProcess queue. The queue is not processed with the inner OSMWriterWorker class. Proposed solution which works for me is (patched to current trunk, i.e. rev. 167): Index: SplitProcessor.java --- SplitProcessor.java Base (BASE) +++ SplitProcessor.java Locally Modified (Based On LOCAL) @@ -172,7 +172,7 @@ } } try { - toProcess.put(STOP_MSG);// Magic flag used to indicate that all data is done. \ No newline at end of file + if (maxThreads > 1) toProcess.put(STOP_MSG);// Magic flag used to indicate that all data is done. \ No newline at end of file } catch (InterruptedException e1) { e1.printStackTrace(); Frank