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POjson filter fails with >#<NoMethodError: undefined method `[]' for nil:NilClass>
primarykey
Id
18268259
data
AcceptedAnswerId
18621446
AnswerCount
1
ClosedDate
CommentCount
0
CommunityOwnedDate
CreationDate
2013-08-16T07:41:44.063
FavoriteCount
0
LastActivityDate
2014-03-07T06:57:45.540
LastEditDate
2014-03-07T06:57:45.540
LastEditorUserId
3086951
OwnerUserId
1458461
ParentId
0
PostTypeId
1
Score
0
ViewCount
1865
LastEditorDisplayName
text
Body
I'm trying to process entries from a logfile that contains both plain messages and json formatted messages. My initial idea was to grep for messages enclosed in curly braces and have them processed by another chained filter. Grep works fine (as does plain message processing), but the subsequent json filter reports an exception. I attached the logstash configuration, input and error message below. Do you have any ideas what the problem might be? Any alternative suggestions for processing plain and json formatted entries from the same file? Thanks a lot, Johannes Error message: <pre><code>Trouble parsing json {:key=>"@message", :raw=>"{\"time\":\"14.08.2013 10:16:31:799\",\"level\":\"DEBUG\",\"thread\":\"main\",\"clazz\":\"org.springframework.beans.factory.support.DefaultListableBeanFactory\",\"line\":\"214\",\"msg\":\"Returning cached instance of singleton bean 'org.apache.activemq.xbean.XBeanBrokerService#0'\"}", :exception=>#<NoMethodError: undefined method `[]' for nil:NilClass>, :level=>:warn} </code></pre> logstash conf: <pre><code>file { path => [ "plain.log" ] type => "plainlog" format => "plain" } } filter { # Grep json formatted messages and send them to following json filter grep { type => "plainlog" add_tag => [ "grepped_json" ] match => [ "@message", "^{.*}" ] } json { tags => [ "grepped_json" ] source => "@message" } } output { stdout { debug => true debug_format => "json"} elasticsearch { embedded => true } } </code></pre> Input from logfile (just one line): <pre><code>{"time":"14.08.2013 10:16:31:799","level":"DEBUG","thread":"main","clazz":"org.springframework.beans.factory.support.DefaultListableBeanFactory","line":"214","msg":"Returning cached instance of singleton bean 'org.apache.activemq.xbean.XBeanBrokerService#0'"} </code></pre>
Tags
<json><logstash>
Title
json filter fails with >#<NoMethodError: undefined method `[]' for nil:NilClass>
singulars
PostAcceptedAnswerId
1. PO
 singulars
 PostTypePostTypeId
 PTAnswer
PostParentId
1. This table or related slice is empty.
PostTypePostTypeId
1. PTQuestion
UserLastEditorUserId
1. USBen Lim
UserOwnerUserId
1. USjayeff
plurals
PostLinksPostIdRelatedPostId
1. This table or related slice is empty.
PostLinksRelatedPostIdPostId
1. This table or related slice is empty.
PostsAcceptedAnswerId
1. This table or related slice is empty.
PostsParentIdCreationDate
1. PO
 singulars
 PostTypePostTypeId
 PTAnswer
VotesPostIdCreationDate
1. This table or related slice is empty.
CommentsPostId
1. This table or related slice is empty.

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