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throw WrappedIOException.wrap("you message " + e.getMessage(), e);On 11/4/11, rob parker <[email protected]> wrote: > I have a UDF to output JSON. (PIG v0.9.1, Hadoop 0.20.204) > > I have tested the setup outside of pig and Jackson will produce a JSON > string. > > However in the UDF I am getting: > > ERROR 2997: Unable to recreate exception from backed error: Error: > org.codehaus.jackson.map.ObjectMapper.writeValueAsString(Ljava/lang/Object;)Ljava/lang/String; > > in the putNext(Tuple t) function: > > the aky object is POJO, and I have tested the hardcoded setup (which is > also used in the UDF for now) in a separate Java main block it eliminate > the extreme obvious. > > I have tried to rethrow a PigException to get some idea of which exception > is causing the issue. > > ObjectMapper mapper = new ObjectMapper(); > String jsonOutput = null; > try { > jsonOutput = mapper.writeValueAsString(aky); > Text text = new Text(jsonOutput); > writer.write(null, text); > } catch (JsonGenerationException e) { > e.printStackTrace(); > throw new PigException(e); > } catch (JsonMappingException e) { > e.printStackTrace(); > throw new PigException(e); > } catch (IOException e) { > e.printStackTrace(); > throw new PigException(e); > } > > Anyway to determine the actual exception or the root cause? > > thanks, > > rob >
