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    Expert tip

    Take a look at this blog post on how to set up Grid2 https://goo.gl/rxzbE6. A user related (in the email group on the source) that using older selenium libs solves this exception.

Solutions on the web

via Google Groups by Ben Vogan, 7 months ago
Instantiation of [simple type, class io.druid.data.input.impl.DelimitedParseSpec] value failed: columns
via Google Groups by Unknown author, 1 year ago
Instantiation of [simple type, class io.druid.data.input.impl.DelimitedParseSpec] value failed: columns
via Google Groups by Philip Walenta, 3 months ago
Instantiation of [simple type, class io.druid.data.input.impl.StringInputRowParser] value failed: json can not be null or empty
via Google Groups by Ben Markham, 5 months ago
Instantiation of [simple type, class io. druid.data.input.impl.StringInputRowParser] value failed: json can not be null or empty
via GitHub by az3
, 2 weeks ago
Can not deserialize instance of java.lang.String out of START_OBJECT token at [Source: N/A; line: -1, column: -1] (through reference chain: java.util.ArrayList[2])
via GitHub by liangqing
, 1 year ago
Instantiation of [simple type, class io.druid.data.input.impl.StringInputRowParser] value failed: com.metamx.common.parsers.JSONPathParser
java.lang.NullPointerException: columns	at com.google.common.base.Preconditions.checkNotNull(Preconditions.java:229)	at io.druid.data.input.impl.DelimitedParseSpec.(DelimitedParseSpec.java:52)	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)	at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)	at java.lang.reflect.Constructor.newInstance(Constructor.java:526)	at com.fasterxml.jackson.databind.introspect.AnnotatedConstructor.call(AnnotatedConstructor.java:125)	at com.fasterxml.jackson.databind.deser.std.StdValueInstantiator.createFromObjectWith(StdValueInstantiator.java:230)	at com.fasterxml.jackson.databind.deser.impl.PropertyBasedCreator.build(PropertyBasedCreator.java:167)	at com.fasterxml.jackson.databind.deser.BeanDeserializer._deserializeUsingPropertyBased(BeanDeserializer.java:398)	at com.fasterxml.jackson.databind.deser.BeanDeserializerBase.deserializeFromObjectUsingNonDefault(BeanDeserializerBase.java:1064)	at com.fasterxml.jackson.databind.deser.BeanDeserializer.deserializeFromObject(BeanDeserializer.java:264)	at com.fasterxml.jackson.databind.deser.BeanDeserializer._deserializeOther(BeanDeserializer.java:156)	at com.fasterxml.jackson.databind.deser.BeanDeserializer.deserialize(BeanDeserializer.java:126)	at com.fasterxml.jackson.databind.jsontype.impl.AsPropertyTypeDeserializer._deserializeTypedUsingDefaultImpl(AsPropertyTypeDeserializer.java:129)	at com.fasterxml.jackson.databind.jsontype.impl.AsPropertyTypeDeserializer.deserializeTypedFromObject(AsPropertyTypeDeserializer.java:92)	at com.fasterxml.jackson.databind.deser.AbstractDeserializer.deserializeWithType(AbstractDeserializer.java:132)	at com.fasterxml.jackson.databind.deser.SettableBeanProperty.deserialize(SettableBeanProperty.java:536)	at com.fasterxml.jackson.databind.deser.BeanDeserializer._deserializeUsingPropertyBased(BeanDeserializer.java:344)	at com.fasterxml.jackson.databind.deser.BeanDeserializerBase.deserializeFromObjectUsingNonDefault(BeanDeserializerBase.java:1064)	at com.fasterxml.jackson.databind.deser.BeanDeserializer.deserializeFromObject(BeanDeserializer.java:264)	at com.fasterxml.jackson.databind.deser.BeanDeserializer._deserializeOther(BeanDeserializer.java:156)	at com.fasterxml.jackson.databind.deser.BeanDeserializer.deserialize(BeanDeserializer.java:126)	at com.fasterxml.jackson.databind.jsontype.impl.AsPropertyTypeDeserializer._deserializeTypedForId(AsPropertyTypeDeserializer.java:113)	at com.fasterxml.jackson.databind.jsontype.impl.AsPropertyTypeDeserializer.deserializeTypedFromObject(AsPropertyTypeDeserializer.java:84)	at com.fasterxml.jackson.databind.deser.AbstractDeserializer.deserializeWithType(AbstractDeserializer.java:132)	at com.fasterxml.jackson.databind.deser.impl.TypeWrappedDeserializer.deserialize(TypeWrappedDeserializer.java:41)	at com.fasterxml.jackson.databind.ObjectMapper._convert(ObjectMapper.java:2769)	at com.fasterxml.jackson.databind.ObjectMapper.convertValue(ObjectMapper.java:2700)	at io.druid.segment.indexing.DataSchema.getParser(DataSchema.java:101)	at com.metamx.tranquility.druid.DruidBeams$.fromConfigInternal(DruidBeams.scala:293)	at com.metamx.tranquility.druid.DruidBeams$.fromConfig(DruidBeams.scala:199)	at com.metamx.tranquility.kafka.KafkaBeamUtils$.createTranquilizer(KafkaBeamUtils.scala:40)	at com.metamx.tranquility.kafka.KafkaBeamUtils.createTranquilizer(KafkaBeamUtils.scala)	at com.metamx.tranquility.kafka.writer.TranquilityEventWriter.(TranquilityEventWriter.java:64)	at com.metamx.tranquility.kafka.writer.WriterController.createWriter(WriterController.java:171)	at com.metamx.tranquility.kafka.writer.WriterController.getWriter(WriterController.java:98)	at com.metamx.tranquility.kafka.KafkaConsumer$2.run(KafkaConsumer.java:231)	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)	at java.util.concurrent.FutureTask.run(FutureTask.java:262)	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)	at java.lang.Thread.run(Thread.java:745)