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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, 10 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, 5 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, 8 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
, 3 months 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)