# Caused by: java.lang.NumberFormatException: For input string: "b4"

**URL:** <https://discuss.elastic.co/t/caused-by-java-lang-numberformatexception-for-input-string-b4/84996>\
**Category:** Elasticsearch\
**Created:** [May 9, 2017, 1:54am UTC](https://discuss.elastic.co/t/caused-by-java-lang-numberformatexception-for-input-string-b4/84996 "2017-05-09T01:54:15Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![shaonbean](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/shaonbean/32/14416_2.png) [@shaonbean](https://discuss.elastic.co/u/shaonbean)\
**Post date:** [May 9, 2017, 1:54am UTC](https://discuss.elastic.co/t/caused-by-java-lang-numberformatexception-for-input-string-b4/84996/1 "2017-05-09T01:54:15Z")

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# elk 5.4 +filebeat

I use filebeat template and office nginx examples gather nginx log, begin is good, but when run sometimes it's will error like this:

Caused by: java.lang.NumberFormatException: For input string: "b4"  
at java.lang.NumberFormatException.forInputString(NumberFormatException.java:65) ~[?:1.8.0\_131]  
at java.lang.Long.parseLong(Long.java:589) ~[?:1.8.0\_131]  
at java.lang.Long.parseLong(Long.java:631) ~[?:1.8.0\_131]  
at org.elasticsearch.common.xcontent.support.AbstractXContentParser.longValue(AbstractXContentParser.java:172) ~[elasticsearch-5.4.0.jar:5.4.0]  
at org.elasticsearch.index.mapper.NumberFieldMapper$NumberType$7.parse(NumberFieldMapper.java:740) ~[elasticsearch-5.4.0.jar:5.4.0]  
at org.elasticsearch.index.mapper.NumberFieldMapper$NumberType$7.parse(NumberFieldMapper.java:719) ~[elasticsearch-5.4.0.jar:5.4.0]  
at org.elasticsearch.index.mapper.NumberFieldMapper.parseCreateField(NumberFieldMapper.java:1058) ~[elasticsearch-5.4.0.jar:5.4.0]  
at org.elasticsearch.index.mapper.FieldMapper.parse(FieldMapper.java:287) ~[elasticsearch-5.4.0.jar:5.4.0]  
... 48 more

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<div class="post-metadata">

**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\
**Post date:** [June 6, 2017, 2:05am UTC](https://discuss.elastic.co/t/caused-by-java-lang-numberformatexception-for-input-string-b4/84996/2 "2017-06-06T02:05:54Z")

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