NullPointer while using json recordreader/recordwriter

2017-05-03 09:54:34,947 ERROR [Timer-Driven Process Thread-13] o.a.nifi.processors.standard.QueryRecord QueryRecord[id=ce897ee6-015b-1000-430c-d128f860a1df] Unable to query Standar
dFlowFileRecord[uuid=d843c811-d047-42a5-9951-7c05953fa43a,claim=StandardContentClaim [resourceClaim=StandardResourceClaim[id=1493819646561-1390, container=default, section=366], of
fset=705664, length=2192],offset=0,name=579032883325039,size=2192] due to org.apache.nifi.processor.exception.ProcessException: Failed to determine schema of data records for Stand
ardFlowFileRecord[uuid=d843c811-d047-42a5-9951-7c05953fa43a,claim=StandardContentClaim [resourceClaim=StandardResourceClaim[id=1493819646561-1390, container=default, section=366],
offset=705664, length=2192],offset=0,name=579032883325039,size=2192]: {}
org.apache.nifi.processor.exception.ProcessException: Failed to determine schema of data records for StandardFlowFileRecord[uuid=d843c811-d047-42a5-9951-7c05953fa43a,claim=Standard
ContentClaim [resourceClaim=StandardResourceClaim[id=1493819646561-1390, container=default, section=366], offset=705664, length=2192],offset=0,name=579032883325039,size=2192]
at org.apache.nifi.queryrecord.FlowFileTable.getRowType(FlowFileTable.java:155)
at org.apache.calcite.sql.validate.EmptyScope.resolve_(EmptyScope.java:160)
at org.apache.calcite.sql.validate.EmptyScope.resolveTable(EmptyScope.java:99)
at org.apache.calcite.sql.validate.DelegatingScope.resolveTable(DelegatingScope.java:202)
at org.apache.calcite.sql.validate.IdentifierNamespace.resolveImpl(IdentifierNamespace.java:104)
at org.apache.calcite.sql.validate.IdentifierNamespace.validateImpl(IdentifierNamespace.java:167)
at org.apache.calcite.sql.validate.AbstractNamespace.validate(AbstractNamespace.java:84)
at org.apache.calcite.sql.validate.SqlValidatorImpl.validateNamespace(SqlValidatorImpl.java:931)
at org.apache.calcite.sql.validate.SqlValidatorImpl.validateQuery(SqlValidatorImpl.java:912)
at org.apache.calcite.sql.validate.SqlValidatorImpl.validateFrom(SqlValidatorImpl.java:2941)
at org.apache.calcite.sql.validate.SqlValidatorImpl.validateFrom(SqlValidatorImpl.java:2926)
at org.apache.calcite.sql.validate.SqlValidatorImpl.validateSelect(SqlValidatorImpl.java:3168)
at org.apache.calcite.sql.validate.SelectNamespace.validateImpl(SelectNamespace.java:60)
at org.apache.calcite.sql.validate.AbstractNamespace.validate(AbstractNamespace.java:84)
at org.apache.calcite.sql.validate.SqlValidatorImpl.validateNamespace(SqlValidatorImpl.java:931)
at org.apache.calcite.sql.validate.SqlValidatorImpl.validateQuery(SqlValidatorImpl.java:912)
at org.apache.calcite.sql.SqlSelect.validate(SqlSelect.java:220)
at org.apache.calcite.sql.validate.SqlValidatorImpl.validateScopedExpression(SqlValidatorImpl.java:887)
at org.apache.calcite.sql.validate.SqlValidatorImpl.validate(SqlValidatorImpl.java:597)
at org.apache.calcite.sql2rel.SqlToRelConverter.convertQuery(SqlToRelConverter.java:547)
at org.apache.calcite.prepare.Prepare.prepareSql(Prepare.java:239)
at org.apache.calcite.prepare.Prepare.prepareSql(Prepare.java:203)
at org.apache.calcite.prepare.CalcitePrepareImpl.prepare2_(CalcitePrepareImpl.java:776)
at org.apache.calcite.prepare.CalcitePrepareImpl.prepare_(CalcitePrepareImpl.java:632)
at org.apache.calcite.prepare.CalcitePrepareImpl.prepareSql(CalcitePrepareImpl.java:602)
at org.apache.calcite.jdbc.CalciteConnectionImpl.parseQuery(CalciteConnectionImpl.java:214)
at org.apache.calcite.jdbc.CalciteConnectionImpl.prepareStatement_(CalciteConnectionImpl.java:196)
at org.apache.calcite.jdbc.CalciteConnectionImpl.prepareStatement(CalciteConnectionImpl.java:185)
at org.apache.calcite.jdbc.CalciteConnectionImpl.prepareStatement(CalciteConnectionImpl.java:86)
at org.apache.calcite.avatica.AvaticaConnection.prepareStatement(AvaticaConnection.java:165)
at org.apache.nifi.processors.standard.QueryRecord.buildCachedStatement(QueryRecord.java:382)
at org.apache.nifi.processors.standard.QueryRecord.getStatement(QueryRecord.java:369)
at org.apache.nifi.processors.standard.QueryRecord.queryWithCache(QueryRecord.java:429)
at org.apache.nifi.processors.standard.QueryRecord.onTrigger(QueryRecord.java:278)
at org.apache.nifi.processor.AbstractProcessor.onTrigger(AbstractProcessor.java:27)
at org.apache.nifi.controller.StandardProcessorNode.onTrigger(StandardProcessorNode.java:1118)
at org.apache.nifi.controller.tasks.ContinuallyRunProcessorTask.call(ContinuallyRunProcessorTask.java:144)
at org.apache.nifi.controller.tasks.ContinuallyRunProcessorTask.call(ContinuallyRunProcessorTask.java:47)
at org.apache.nifi.controller.scheduling.TimerDrivenSchedulingAgent$1.run(TimerDrivenSchedulingAgent.java:132)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:308)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:180)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:294)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.NullPointerException: null
at java.text.SimpleDateFormat.<init>(SimpleDateFormat.java:598)
at java.text.SimpleDateFormat.<init>(SimpleDateFormat.java:580)
at org.apache.nifi.serialization.record.util.DataTypeUtils.getDateFormat(DataTypeUtils.java:447)
at org.apache.nifi.json.JsonTreeRowRecordReader.<init>(JsonTreeRowRecordReader.java:59)
at org.apache.nifi.json.JsonTreeReader.createRecordReader(JsonTreeReader.java:73)
at sun.reflect.GeneratedMethodAccessor404.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.apache.nifi.controller.service.StandardControllerServiceInvocationHandler.invoke(StandardControllerServiceInvocationHandler.java:89)
at com.sun.proxy.$Proxy129.createRecordReader(Unknown Source)
at org.apache.nifi.queryrecord.FlowFileTable.getRowType(FlowFileTable.java:152)
... 45 common frames omitted