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java.lang.NullPointerException: 	at com.googlecode.jmxtrans.model.output.support.opentsdb.OpenTSDBMessageFormatter.processOneMetric(OpenTSDBMessageFormatter.java:196)	at com.googlecode.jmxtrans.model.output.support.opentsdb.OpenTSDBMessageFormatter.formatResult(OpenTSDBMessageFormatter.java:159)	at com.googlecode.jmxtrans.model.output.support.opentsdb.OpenTSDBMessageFormatter.access$000(OpenTSDBMessageFormatter.java:54)	at com.googlecode.jmxtrans.model.output.support.opentsdb.OpenTSDBMessageFormatter$1.apply(OpenTSDBMessageFormatter.java:170)	at com.googlecode.jmxtrans.model.output.support.opentsdb.OpenTSDBMessageFormatter$1.apply(OpenTSDBMessageFormatter.java:166)	at com.google.common.collect.Iterators$8.transform(Iterators.java:817)	at com.google.common.collect.TransformedIterator.next(TransformedIterator.java:48)	at com.google.common.collect.TransformedIterator.next(TransformedIterator.java:48)	at com.google.common.collect.Iterators$5.hasNext(Iterators.java:569)	at com.google.common.collect.ImmutableList.copyOf(ImmutableList.java:249)	at com.google.common.collect.ImmutableList.copyOf(ImmutableList.java:209)	at com.google.common.collect.FluentIterable.toList(FluentIterable.java:484)	at com.googlecode.jmxtrans.model.output.support.opentsdb.OpenTSDBMessageFormatter.formatResults(OpenTSDBMessageFormatter.java:173)	at com.googlecode.jmxtrans.model.output.OpenTSDBWriter.internalWrite(OpenTSDBWriter.java:116)	at com.googlecode.jmxtrans.model.output.BaseOutputWriter.doWrite(BaseOutputWriter.java:157)	at com.googlecode.jmxtrans.jmx.ResultProcessor$1.run(ResultProcessor.java:58)	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)	at java.util.concurrent.FutureTask.run(FutureTask.java:266)	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)	at java.lang.Thread.run(Thread.java:745)