背景：之前产品里面用到的ElasticSearch服务，是单独部署的服务。调用的时候是后端发送http请求es服务器，返回结果后再次查询数据库获取数据。为了减少不必要的http请求，故将es服务集成到后端服务中。在此记录一下
说做就做
ElasticSearch版本5.0.1
直接把es服务作为后端服务的module引入，启动服务。报错
Caused by: java.lang.NoSuchFieldError: FAIL_ON_SYMBOL_HASH_OVERFLOW
at org.elasticsearch.common.xcontent.json.JsonXContent.<clinit>(JsonXContent.java:76)
at org.elasticsearch.common.xcontent.XContentType$1.xContent(XContentType.java:58)
at org.elasticsearch.common.settings.Setting.arrayToParsableString(Setting.java:698)
at org.elasticsearch.common.settings.Setting.lambda$listSetting$26(Setting.java:656)
at org.elasticsearch.common.settings.Setting$$Lambda$38/1908571316.apply(Unknown Source)
at org.elasticsearch.common.settings.Setting$2.getRaw(Setting.java:660)
at org.elasticsearch.common.settings.Setting.get(Setting.java:300)
at org.elasticsearch.plugins.PluginsService.<init>(PluginsService.java:164)
at org.elasticsearch.client.transport.TransportClient.newPluginService(TransportClient.java:81)
at org.elasticsearch.client.transport.TransportClient.buildTemplate(TransportClient.java:106)
at org.elasticsearch.client.transport.TransportClient.<init>(TransportClient.java:228)
at org.elasticsearch.transport.client.PreBuiltTransportClient.<init>(PreBuiltTransportClient.java:69)
at org.elasticsearch.transport.client.PreBuiltTransportClient.<init>(PreBuiltTransportClient.java:65)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:497)
at org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor$LifecycleElement.invoke(InitDestroyAnnotationBeanPostProcessor.java:365)
at org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor$LifecycleMetadata.invokeInitMethods(InitDestroyAnnotationBeanPostProcessor.java:310)
at org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor.postProcessBeforeInitialization(InitDestroyAnnotationBeanPostProcessor.java:133)
... 146 more
看下报错位置代码
jsonFactory.configure(JsonFactory.Feature.FAIL_ON_SYMBOL_HASH_OVERFLOW, false);
发现
com.fasterxml.jackson.core.JsonFactory.Feature.FAIL_ON_SYMBOL_HASH_OVERFLOW
要求的jar包是jackson-core-2.8.1.jar。网上随意查了一下，基本上定位到是jar包冲突导致。
直接上maven helper，分析有多少jar包冲突
image.png
发现冲突的jar包
image.png
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分别引用高版本的jackson-core 并打成jar包，重新启动
Artifact is deployed successfully
下图为ElasticSearch版本5.0.1依赖的Jackson.core的版本
image.png
如果有做的不对的地方，随时欢迎指正!
