# Bootstrap method initialization exception - Elasticsearch 7.8.0

**URL:** <https://discuss.elastic.co/t/bootstrap-method-initialization-exception-elasticsearch-7-8-0/242588>\
**Category:** Elasticsearch\
**Tags:** language-clients\
**Created:** [July 25, 2020, 5:04am UTC](https://discuss.elastic.co/t/bootstrap-method-initialization-exception-elasticsearch-7-8-0/242588 "2020-07-25T05:04:29Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![dpadasala93](https://avatars.discourse-cdn.com/v4/letter/d/dc4da7/32.png) [@dpadasala93](https://discuss.elastic.co/u/dpadasala93)\
**Post date:** [July 25, 2020, 5:04am UTC](https://discuss.elastic.co/t/bootstrap-method-initialization-exception-elasticsearch-7-8-0/242588/1 "2020-07-25T05:04:29Z")

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Hi Team,

Using java-high-level-rest client when we call getMapping for index or create index functions below errors get generated every time. almost for all the index related calls are generating this exception.

bootstrap method initialization exception  
at java.base/java.lang.invoke.BootstrapMethodInvoker.invoke(BootstrapMethodInvoker.java:194)  
at java.base/java.lang.invoke.CallSite.makeSite(CallSite.java:315)  
at java.base/java.lang.invoke.MethodHandleNatives.linkCallSiteImpl(MethodHandleNatives.java:259)  
at java.base/java.lang.invoke.MethodHandleNatives.linkCallSite(MethodHandleNatives.java:249)  
at org.elasticsearch.client.RestHighLevelClient.parseEntity(RestHighLevelClient.java:1883)  
at org.elasticsearch.client.RestHighLevelClient.lambda$performRequestAndParseEntity$9(RestHighLevelClient.java:1564)  
at org.elasticsearch.client.RestHighLevelClient.internalPerformRequest(RestHighLevelClient.java:1628)  
at org.elasticsearch.client.RestHighLevelClient.performRequest(RestHighLevelClient.java:1596)  
at org.elasticsearch.client.RestHighLevelClient.performRequestAndParseEntity(RestHighLevelClient.java:1563)  
at org.elasticsearch.client.IndicesClient.getMapping(IndicesClient.java:282)

Caused by: java.lang.invoke.LambdaConversionException: Invalid receiver type interface org.apache.http.Header; not a subtype of implementation type interface org.apache.http.NameValuePair  
at java.base/java.lang.invoke.AbstractValidatingLambdaMetafactory.validateMetafactoryArgs(AbstractValidatingLambdaMetafactory.java:254)  
at java.base/java.lang.invoke.LambdaMetafactory.metafactory(LambdaMetafactory.java:327)  
at java.base/java.lang.invoke.BootstrapMethodInvoker.invoke(BootstrapMethodInvoker.java:127)

I am using below environments

elasticsearch - 7.8.0.  
openJDK - 11 and 14, JDK 1.8  
elasticsearch-rest-high-level-client-7.8.0.jar and its dependencies included in pom.xml  
Operation System : Tried both Windows 10 and Linux Mint.

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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:** [August 22, 2020, 5:05am UTC](https://discuss.elastic.co/t/bootstrap-method-initialization-exception-elasticsearch-7-8-0/242588/2 "2020-08-22T05:05:07Z")

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