# Fscrawler Exception in thread "main" com.fasterxml.jackson.databind.JsonMappingException: Unrecognized character escape 'U'

**URL:** <https://discuss.elastic.co/t/fscrawler-exception-in-thread-main-com-fasterxml-jackson-databind-jsonmappingexception-unrecognized-character-escape-u/199868>\
**Category:** Elasticsearch\
**Created:** [September 17, 2019, 5:40pm UTC](https://discuss.elastic.co/t/fscrawler-exception-in-thread-main-com-fasterxml-jackson-databind-jsonmappingexception-unrecognized-character-escape-u/199868 "2019-09-17T17:40:22Z")\
**Posts on this page:** 4\
**Page:** 1

<div class="post-metadata">

**Author:** ![vstevenson](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/vstevenson/32/54354_2.png) [@vstevenson](https://discuss.elastic.co/u/vstevenson)\
**Post date:** [September 17, 2019, 5:40pm UTC](https://discuss.elastic.co/t/fscrawler-exception-in-thread-main-com-fasterxml-jackson-databind-jsonmappingexception-unrecognized-character-escape-u/199868/1 "2019-09-17T17:40:22Z")

</div>

Hi,

I'm trying to use fscrawler to index pdf files. When I try to run it, I get the following error message:

```
C:\Users\vincent.stevenson\Desktop\fscrawler-2.5\fscrawler-2.5>bin\fscrawler --config_dir .\config books
Exception in thread "main" com.fasterxml.jackson.databind.JsonMappingException: Unrecognized character escape 'U' (code 85)
 at [Source: (String)"{
  "name" : "books",
  "fs" : {
    "url" : "C:\Users\vincent.stevenson\Desktop\user_manuals",
    "update_rate" : "15m",
    "excludes" : ["*/~*"],
    "json_support" : false,
    "filename_as_id" : false,
    "add_filesize" : true,
    "remove_deleted" : true,
    "add_as_inner_object" : false,
    "store_source" : false,
    "index_content" : true,
    "attributes_support" : false,
    "raw_metadata" : true,
    "xml_support" : false,
    "index_folders" : true,
  "[truncated 472 chars]; line: 4, column: 18]
 at [Source: (String)"{
  "name" : "books",
  "fs" : {
    "url" : "C:\Users\vincent.stevenson\Desktop\user_manuals",
    "update_rate" : "15m",
    "excludes" : ["*/~*"],
    "json_support" : false,
    "filename_as_id" : false,
    "add_filesize" : true,
    "remove_deleted" : true,
    "add_as_inner_object" : false,
    "store_source" : false,
    "index_content" : true,
    "attributes_support" : false,
    "raw_metadata" : true,
    "xml_support" : false,
    "index_folders" : true,
  "[truncated 472 chars]; line: 4, column: 13] (through reference chain: fr.pilato.elasticsearch.crawler.fs.settings.FsSettings["fs"]->fr.pilato.elasticsearch.crawler.fs.settings.Fs["url"])
        at com.fasterxml.jackson.databind.JsonMappingException.wrapWithPath(JsonMappingException.java:391)
        at com.fasterxml.jackson.databind.JsonMappingException.wrapWithPath(JsonMappingException.java:351)
        at com.fasterxml.jackson.databind.deser.BeanDeserializerBase.wrapAndThrow(BeanDeserializerBase.java:1711)
        at com.fasterxml.jackson.databind.deser.BeanDeserializer.vanillaDeserialize(BeanDeserializer.java:290)
        at com.fasterxml.jackson.databind.deser.BeanDeserializer.deserialize(BeanDeserializer.java:151)
        at com.fasterxml.jackson.databind.deser.impl.MethodProperty.deserializeAndSet(MethodProperty.java:127)
        at com.fasterxml.jackson.databind.deser.BeanDeserializer.vanillaDeserialize(BeanDeserializer.java:288)
        at com.fasterxml.jackson.databind.deser.BeanDeserializer.deserialize(BeanDeserializer.java:151)
        at com.fasterxml.jackson.databind.ObjectMapper._readMapAndClose(ObjectMapper.java:4013)
        at com.fasterxml.jackson.databind.ObjectMapper.readValue(ObjectMapper.java:3004)
        at fr.pilato.elasticsearch.crawler.fs.settings.FsSettingsParser.fromJson(FsSettingsParser.java:35)
        at fr.pilato.elasticsearch.crawler.fs.settings.FsSettingsFileHandler.read(FsSettingsFileHandler.java:47)
        at fr.pilato.elasticsearch.crawler.fs.cli.FsCrawler.main(FsCrawler.java:195)
Caused by: com.fasterxml.jackson.core.JsonParseException: Unrecognized character escape 'U' (code 85)
 at [Source: (String)"{
  "name" : "books",
  "fs" : {
    "url" : "C:\Users\vincent.stevenson\Desktop\user_manuals",
    "update_rate" : "15m",
    "excludes" : ["*/~*"],
    "json_support" : false,
    "filename_as_id" : false,
    "add_filesize" : true,
    "remove_deleted" : true,
    "add_as_inner_object" : false,
    "store_source" : false,
    "index_content" : true,
    "attributes_support" : false,
    "raw_metadata" : true,
    "xml_support" : false,
    "index_folders" : true,
  "[truncated 472 chars]; line: 4, column: 18]
        at com.fasterxml.jackson.core.JsonParser._constructError(JsonParser.java:1804)
        at com.fasterxml.jackson.core.base.ParserMinimalBase._reportError(ParserMinimalBase.java:669)
        at com.fasterxml.jackson.core.base.ParserMinimalBase._handleUnrecognizedCharacterEscape(ParserMinimalBase.java:646)
        at com.fasterxml.jackson.core.json.ReaderBasedJsonParser._decodeEscaped(ReaderBasedJsonParser.java:2522)
        at com.fasterxml.jackson.core.json.ReaderBasedJsonParser._finishString2(ReaderBasedJsonParser.java:2043)
        at com.fasterxml.jackson.core.json.ReaderBasedJsonParser._finishString(ReaderBasedJsonParser.java:2016)
        at com.fasterxml.jackson.core.json.ReaderBasedJsonParser.getText(ReaderBasedJsonParser.java:278)
        at com.fasterxml.jackson.databind.deser.std.StringDeserializer.deserialize(StringDeserializer.java:35)
        at com.fasterxml.jackson.databind.deser.std.StringDeserializer.deserialize(StringDeserializer.java:10)
        at com.fasterxml.jackson.databind.deser.impl.MethodProperty.deserializeAndSet(MethodProperty.java:127)
        at com.fasterxml.jackson.databind.deser.BeanDeserializer.vanillaDeserialize(BeanDeserializer.java:288)
        ... 9 more

```

Is this an error in the \_settings.json file? How can I resolve this?

Thanks!

---

<div class="post-metadata">

**Author:** ![dadoonet](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/dadoonet/32/137187_2.png) [@dadoonet](https://discuss.elastic.co/u/dadoonet)\
**Post date:** [September 17, 2019, 8:17pm UTC](https://discuss.elastic.co/t/fscrawler-exception-in-thread-main-com-fasterxml-jackson-databind-jsonmappingexception-unrecognized-character-escape-u/199868/2 "2019-09-17T20:17:22Z")

</div>

few things:

Don't use \ but / for paths  
Please try latest 2.7-SNAPSHOT

---

<div class="post-metadata">

**Author:** ![vstevenson](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/vstevenson/32/54354_2.png) [@vstevenson](https://discuss.elastic.co/u/vstevenson)\
**Post date:** [September 19, 2019, 5:09pm UTC](https://discuss.elastic.co/t/fscrawler-exception-in-thread-main-com-fasterxml-jackson-databind-jsonmappingexception-unrecognized-character-escape-u/199868/3 "2019-09-19T17:09:01Z")

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Thank you!

---

<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:** [October 17, 2019, 5:09pm UTC](https://discuss.elastic.co/t/fscrawler-exception-in-thread-main-com-fasterxml-jackson-databind-jsonmappingexception-unrecognized-character-escape-u/199868/4 "2019-10-17T17:09:04Z")

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