# Could not initialize class org.elasticsearch.common.xcontent.json.JsonXContent

**URL:** <https://discuss.elastic.co/t/could-not-initialize-class-org-elasticsearch-common-xcontent-json-jsonxcontent/48275>\
**Category:** Elasticsearch\
**Created:** [April 25, 2016, 5:30am UTC](https://discuss.elastic.co/t/could-not-initialize-class-org-elasticsearch-common-xcontent-json-jsonxcontent/48275 "2016-04-25T05:30:39Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![gopin4hat7ash](https://avatars.discourse-cdn.com/v4/letter/g/a88e57/32.png) [@gopin4hat7ash](https://discuss.elastic.co/u/gopin4hat7ash)\
**Post date:** [April 25, 2016, 5:30am UTC](https://discuss.elastic.co/t/could-not-initialize-class-org-elasticsearch-common-xcontent-json-jsonxcontent/48275/1 "2016-04-25T05:30:39Z")

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While running the junits , we are facing the below issue and we are using ES2.3.1

java.lang.NoClassDefFoundError: Could not initialize class org.elasticsearch.common.xcontent.json.JsonXContent  
at org.elasticsearch.common.xcontent.XContentFactory.contentBuilder(XContentFactory.java:122)  
at org.elasticsearch.common.xcontent.XContentFactory.jsonBuilder(XContentFactory.java:49)  
at org.elasticsearch.action.support.ToXContentToBytes.toString(ToXContentToBytes.java:73)  
at java.lang.String.valueOf(String.java:2847)  
at java.lang.StringBuilder.append(StringBuilder.java:128)  
at com.XXX.searchservice.util.IPDQueryBuilderUtil.filterByAtaQuery(IPDQueryBuilderUtil.java:151)

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**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\
**Post date:** [July 5, 2017, 10:56pm UTC](https://discuss.elastic.co/t/could-not-initialize-class-org-elasticsearch-common-xcontent-json-jsonxcontent/48275/2 "2017-07-05T22:56:34Z")

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