# java.lang.ClassNotFoundException: org.elasticsearch.search.aggregations.metrics.cardinality.ParsedCardinality **URL:** \ **Category:** Elasticsearch\ **Created:** [August 7, 2019, 6:11pm UTC](https://discuss.elastic.co/t/java-lang-classnotfoundexception-org-elasticsearch-search-aggregations-metrics-cardinality-parsedcardinality/194304 "2019-08-07T18:11:58Z")\ **Posts on this page:** 19\ **Page:** 1
**Author:** ![iti](https://avatars.discourse-cdn.com/v4/letter/i/b19c9b/32.png) [@iti](https://discuss.elastic.co/u/iti)\ **Post date:** [August 7, 2019, 6:11pm UTC](https://discuss.elastic.co/t/java-lang-classnotfoundexception-org-elasticsearch-search-aggregations-metrics-cardinality-parsedcardinality/194304/1 "2019-08-07T18:11:59Z")
My environment: two ES clusters: one ES 6.7 and one ES 7.1 My app need to use High Level REST Client to access both cluster at the same time. When I am using 7.x REST CLIENT with 7.X ES library. When accessing 6.x ES, I got [Ccs\_minimize\_roundtrips error when using 7.X high level REST API to access 6.x index](https://discuss.elastic.co/t/ccs-minimize-roundtrips-error-when-using-7-x-high-level-rest-api-to-access-6-x-index/194095) When I am using 6.x REST CLient with 7.X ES, when accessing 7.x ES,I got java.lang.ClassNotFoundException: org.elasticsearch.search.aggregations.metrics.cardinality.ParsedCardinality since I have a Cardinality Aggregation. When I am using both 6.x REST Client and ES lib, when access 7.x ES, some of the aggregation result on 7.X ES is not correct. Any idea how to solve this issue? Thanks ---
**Author:** ![javanna](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/javanna/32/4698_2.png) [@javanna](https://discuss.elastic.co/u/javanna)\ **Post date:** [August 12, 2019, 8:52am UTC](https://discuss.elastic.co/t/java-lang-classnotfoundexception-org-elasticsearch-search-aggregations-metrics-cardinality-parsedcardinality/194304/2 "2019-08-12T08:52:17Z")
Hi, this one looks like a bug at first glance. Do you have the complete stacktrace of that exception? And steps to reproduce it? ---
**Author:** ![iti](https://avatars.discourse-cdn.com/v4/letter/i/b19c9b/32.png) [@iti](https://discuss.elastic.co/u/iti)\ **Post date:** [August 14, 2019, 12:07am UTC](https://discuss.elastic.co/t/java-lang-classnotfoundexception-org-elasticsearch-search-aggregations-metrics-cardinality-parsedcardinality/194304/3 "2019-08-14T00:07:35Z")
``` Here is the stack trace: ElasticsearchStatusException[Elasticsearch exception [type=index_not_found_exception, reason=no such index [xxx-api]]] at org.elasticsearch.rest.BytesRestResponse.errorFromXContent(BytesRestResponse.java:177) at org.elasticsearch.client.RestHighLevelClient.parseEntity(RestHighLevelClient.java:2053) at org.elasticsearch.client.RestHighLevelClient.parseResponseException(RestHighLevelClient.java:2030) at org.elasticsearch.client.RestHighLevelClient.internalPerformRequest(RestHighLevelClient.java:1777) at org.elasticsearch.client.RestHighLevelClient.performRequest(RestHighLevelClient.java:1734) at org.elasticsearch.client.RestHighLevelClient.performRequestAndParseEntity(RestHighLevelClient.java:1696) at org.elasticsearch.client.RestHighLevelClient.search(RestHighLevelClient.java:1092) ... at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) at java.lang.Thread.run(Thread.java:748) Suppressed: org.elasticsearch.client.ResponseException: method [POST], host [xxx], URI [/xxx-api/_search?typed_keys=true&ignore_unavailable=false&expand_wildcards=open&allow_no_indices=true&ignore_throttled=true&search_type=query_then_fetch&batched_reduce_size=512], status line [HTTP/1.1 404 Not Found] {"error":{"root_cause":[{"type":"index_not_found_exception","reason":"no such index [xxx-api]","resource.type":"index_or_alias","resource.id":"xxx-api","index_uuid":"_na_","index":"xxx-api"}],"type":"index_not_found_exception","reason":"no such index [xxx-api]","resource.type":"index_or_alias","resource.id":"xxx-api","index_uuid":"_na_","index":"xxx-api"},"status":404} at org.elasticsearch.client.RestClient$SyncResponseListener.get(RestClient.java:936) at org.elasticsearch.client.RestClient.performRequest(RestClient.java:233) at org.elasticsearch.client.RestHighLevelClient.internalPerformRequest(RestHighLevelClient.java:1764) ... 113 more Caused by: org.elasticsearch.client.ResponseException: method [POST], host [xxx], URI [/xxx-api/_search?typed_keys=true&ignore_unavailable=false&expand_wildcards=open&allow_no_indices=true&ignore_throttled=true&search_type=query_then_fetch&batched_reduce_size=512], status line [HTTP/1.1 404 Not Found] {"error":{"root_cause":[{"type":"index_not_found_exception","reason":"no such index [xxx-api]","resource.type":"index_or_alias","resource.id":"xxx-api","index_uuid":"_na_","index":"xxx-api"}],"type":"index_not_found_exception","reason":"no such index [xxx-api]","resource.type":"index_or_alias","resource.id":"xxx-api","index_uuid":"_na_","index":"xxx-api"},"status":404} at org.elasticsearch.client.RestClient$1.completed(RestClient.java:552) at org.elasticsearch.client.RestClient$1.completed(RestClient.java:537) at org.apache.http.concurrent.BasicFuture.completed(BasicFuture.java:123) at org.apache.http.impl.nio.client.DefaultClientExchangeHandlerImpl.responseCompleted(DefaultClientExchangeHandlerImpl.java:181) at org.apache.http.nio.protocol.HttpAsyncRequestExecutor.processResponse(HttpAsyncRequestExecutor.java:436) at org.apache.http.nio.protocol.HttpAsyncRequestExecutor.inputReady(HttpAsyncRequestExecutor.java:326) at org.apache.http.impl.nio.DefaultNHttpClientConnection.consumeInput(DefaultNHttpClientConnection.java:265) at org.apache.http.impl.nio.client.InternalIODispatch.onInputReady(InternalIODispatch.java:81) at org.apache.http.impl.nio.client.InternalIODispatch.onInputReady(InternalIODispatch.java:39) at org.apache.http.impl.nio.reactor.AbstractIODispatch.inputReady(AbstractIODispatch.java:121) at org.apache.http.impl.nio.reactor.BaseIOReactor.readable(BaseIOReactor.java:162) at org.apache.http.impl.nio.reactor.AbstractIOReactor.processEvent(AbstractIOReactor.java:337) at org.apache.http.impl.nio.reactor.AbstractIOReactor.processEvents(AbstractIOReactor.java:315) at org.apache.http.impl.nio.reactor.AbstractIOReactor.execute(AbstractIOReactor.java:276) at org.apache.http.impl.nio.reactor.BaseIOReactor.execute(BaseIOReactor.java:104) at org.apache.http.impl.nio.reactor.AbstractMultiworkerIOReactor$Worker.run(AbstractMultiworkerIOReactor.java:588) ... 1 more 2019-08-13 16:36:13.750 DEBUG 4688 --- [XNIO-2 task-1] xxx.errors.ExceptionTranslator : An unexpected error occurred: null java.lang.NullPointerException: null at xxx.dao.impl.QueryService.search(QueryService.java:237) at xxx.dao.impl.QueryService.search(QueryService.java:100) at xxx.web.rest.SearchResource.getSummary(SearchResource.java:75) at xxx.web.rest.SearchResource$$FastClassBySpringCGLIB$$cec506a1.invoke() at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:204) ... at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) at java.lang.Thread.run(Thread.java:748) 2019-08-13 16:36:13.788 WARN 4688 --- [XNIO-2 task-1] .m.m.a.ExceptionHandlerExceptionResolver : Resolved exception caused by Handler execution: java.lang.NullPointerException ``` ---
**Author:** ![iti](https://avatars.discourse-cdn.com/v4/letter/i/b19c9b/32.png) [@iti](https://discuss.elastic.co/u/iti)\ **Post date:** [August 14, 2019, 12:18am UTC](https://discuss.elastic.co/t/java-lang-classnotfoundexception-org-elasticsearch-search-aggregations-metrics-cardinality-parsedcardinality/194304/4 "2019-08-14T00:18:32Z")
There is no easy way to reproduce the error. But the code is like following: `ExpirationDateUtil.getAggregationBuilders(entry.getValue().getPath()).forEach(edrSubAggBuilder -> {` ``` builder.subAggregation(edrSubAggBuilder .subAggregation(AggregationBuilders.cardinality("unique_summary_count") .field("relation#summary"))); }); ``` Before adding is like this and it works fine: `ExpirationDateUtil.getAggregationBuilders(entry.getValue().getPath()).forEach(edrSubAggBuilder -> {` ``` builder.subAggregation(edrSubAggBuilder); ``` `});` ---
**Author:** ![javanna](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/javanna/32/4698_2.png) [@javanna](https://discuss.elastic.co/u/javanna)\ **Post date:** [August 15, 2019, 8:46am UTC](https://discuss.elastic.co/t/java-lang-classnotfoundexception-org-elasticsearch-search-aggregations-metrics-cardinality-parsedcardinality/194304/5 "2019-08-15T08:46:41Z")
In the stacktrace that you posted, I see an index not found exception being returned, and a null pointer exception in your client code. I don't see any class not found. ---
**Author:** ![iti](https://avatars.discourse-cdn.com/v4/letter/i/b19c9b/32.png) [@iti](https://discuss.elastic.co/u/iti)\ **Post date:** [August 15, 2019, 4:46pm UTC](https://discuss.elastic.co/t/java-lang-classnotfoundexception-org-elasticsearch-search-aggregations-metrics-cardinality-parsedcardinality/194304/6 "2019-08-15T16:46:10Z")
Sorry, my bad. Did not pay attention to the error. Here is the correct trace: ``` org.springframework.web.util.NestedServletException: Handler dispatch failed; nested exception is java.lang.NoClassDefFoundError: org/elasticsearch/search/aggregations/metrics/cardinality/ParsedCardinality at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:982) at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:901) at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:970) at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:872) at javax.servlet.http.HttpServlet.service(HttpServlet.java:707) at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:846) at javax.servlet.http.HttpServlet.service(HttpServlet.java:790) ... at io.undertow.server.HttpServerExchange$1.run(HttpServerExchange.java:830) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) at java.lang.Thread.run(Thread.java:748) Caused by: java.lang.NoClassDefFoundError: org/elasticsearch/search/aggregations/metrics/cardinality/ParsedCardinality at org.elasticsearch.client.RestHighLevelClient.lambda$getDefaultNamedXContents$19(RestHighLevelClient.java:2087) at org.elasticsearch.common.xcontent.NamedXContentRegistry.parseNamedObject(NamedXContentRegistry.java:141) at org.elasticsearch.common.xcontent.support.AbstractXContentParser.namedObject(AbstractXContentParser.java:415) at org.elasticsearch.common.xcontent.XContentParserUtils.parseTypedKeysObject(XContentParserUtils.java:153) at org.elasticsearch.search.aggregations.bucket.range.ParsedRange$ParsedBucket.parseRangeBucketXContent(ParsedRange.java:182) at org.elasticsearch.search.aggregations.bucket.range.ParsedDateRange$ParsedBucket.fromXContent(ParsedDateRange.java:71) at org.elasticsearch.search.aggregations.bucket.range.ParsedDateRange.lambda$static$0(ParsedDateRange.java:41) at org.elasticsearch.search.aggregations.ParsedMultiBucketAggregation.lambda$declareMultiBucketAggregationFields$0(ParsedMultiBucketAggregation.java:75) at org.elasticsearch.common.xcontent.ObjectParser.parseValue(ObjectParser.java:314) at org.elasticsearch.common.xcontent.ObjectParser.parseArray(ObjectParser.java:308) at org.elasticsearch.common.xcontent.ObjectParser.parseSub(ObjectParser.java:340) at org.elasticsearch.common.xcontent.ObjectParser.parse(ObjectParser.java:168) at org.elasticsearch.common.xcontent.ObjectParser.parse(ObjectParser.java:131) at org.elasticsearch.search.aggregations.bucket.range.ParsedDateRange.fromXContent(ParsedDateRange.java:46) at org.elasticsearch.client.RestHighLevelClient.lambda$getDefaultNamedXContents$55(RestHighLevelClient.java:2124) at org.elasticsearch.common.xcontent.NamedXContentRegistry.parseNamedObject(NamedXContentRegistry.java:141) at org.elasticsearch.common.xcontent.support.AbstractXContentParser.namedObject(AbstractXContentParser.java:415) at org.elasticsearch.common.xcontent.XContentParserUtils.parseTypedKeysObject(XContentParserUtils.java:153) at org.elasticsearch.search.aggregations.bucket.ParsedSingleBucketAggregation.parseXContent(ParsedSingleBucketAggregation.java:86) at org.elasticsearch.search.aggregations.bucket.filter.ParsedFilter.fromXContent(ParsedFilter.java:34) at org.elasticsearch.client.RestHighLevelClient.lambda$getDefaultNamedXContents$51(RestHighLevelClient.java:2120) at org.elasticsearch.common.xcontent.NamedXContentRegistry.parseNamedObject(NamedXContentRegistry.java:141) at org.elasticsearch.common.xcontent.support.AbstractXContentParser.namedObject(AbstractXContentParser.java:415) at org.elasticsearch.common.xcontent.XContentParserUtils.parseTypedKeysObject(XContentParserUtils.java:153) at org.elasticsearch.search.aggregations.Aggregations.fromXContent(Aggregations.java:141) at org.elasticsearch.action.search.SearchResponse.innerFromXContent(SearchResponse.java:292) at org.elasticsearch.action.search.SearchResponse.fromXContent(SearchResponse.java:251) at org.elasticsearch.client.RestHighLevelClient.parseEntity(RestHighLevelClient.java:2053) at org.elasticsearch.client.RestHighLevelClient.lambda$performRequestAndParseEntity$13(RestHighLevelClient.java:1697) at org.elasticsearch.client.RestHighLevelClient.internalPerformRequest(RestHighLevelClient.java:1781) at org.elasticsearch.client.RestHighLevelClient.performRequest(RestHighLevelClient.java:1734) at org.elasticsearch.client.RestHighLevelClient.performRequestAndParseEntity(RestHighLevelClient.java:1696) at org.elasticsearch.client.RestHighLevelClient.search(RestHighLevelClient.java:1092) at xxx.dao.impl.QueryService.buckets(QueryService.java:425) at xxx.web.rest.SearchResource.getBuckets(SearchResource.java:95) at xxx.web.rest.SearchResource$$FastClassBySpringCGLIB$$cec506a1.invoke() at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:204) ... at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:827) at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:738) at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:85) at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:967) ... 88 common frames omitted Caused by: java.lang.ClassNotFoundException: org.elasticsearch.search.aggregations.metrics.cardinality.ParsedCardinality at java.net.URLClassLoader.findClass(URLClassLoader.java:382) at java.lang.ClassLoader.loadClass(ClassLoader.java:424) at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:349) at java.lang.ClassLoader.loadClass(ClassLoader.java:357) ... 142 common frames omitted 2019-08-15 09:37:47.420 WARN 472 --- [XNIO-2 task-1] .m.m.a.ExceptionHandlerExceptionResolver : Resolved exception caused by Handler execution: org.springframework.web.util.NestedServletException: Handler dispatch failed; nested exception is java.lang.NoClassDefFoundError: org/elasticsearch/search/aggregations/metrics/cardinality/ParsedCardinality ``` ---
**Author:** ![javanna](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/javanna/32/4698_2.png) [@javanna](https://discuss.elastic.co/u/javanna)\ **Post date:** [August 16, 2019, 12:53pm UTC](https://discuss.elastic.co/t/java-lang-classnotfoundexception-org-elasticsearch-search-aggregations-metrics-cardinality-parsedcardinality/194304/7 "2019-08-16T12:53:54Z")
I cannot think of a reason that would cause besides some classpath issues in your application. The version you are using was compiled correctly and relies on the ParsedCardinality class, but at runtime such class is not there when it needs to be loaded. Given that the high-level client depends on the whole elasticsearch server, you possibly have a version of the client in your classpath, but a different version of elasticsearch which does not support yet the cardinality aggregation. Could you check that please? ---
**Author:** ![iti](https://avatars.discourse-cdn.com/v4/letter/i/b19c9b/32.png) [@iti](https://discuss.elastic.co/u/iti)\ **Post date:** [August 16, 2019, 4:26pm UTC](https://discuss.elastic.co/t/java-lang-classnotfoundexception-org-elasticsearch-search-aggregations-metrics-cardinality-parsedcardinality/194304/8 "2019-08-16T16:26:02Z")
Why high level REST API lib comes with 2.4.6 version of elasticsearch? ![Dependency](https://us1.discourse-cdn.com/elastic/original/3X/9/e/9e9581cbfd6e4a0ccfdfd2ebc4b0d4cccd6accea.png) All my elastic search lib are 6.x and above. Cardinality aggs should be there. 2.4.6 will not though. But I have no control over it. Thanks ---
**Author:** ![rjernst](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/rjernst/32/6363_2.png) [@rjernst](https://discuss.elastic.co/u/rjernst)\ **Post date:** [August 16, 2019, 6:18pm UTC](https://discuss.elastic.co/t/java-lang-classnotfoundexception-org-elasticsearch-search-aggregations-metrics-cardinality-parsedcardinality/194304/9 "2019-08-16T18:18:55Z")
The HLRC 6.8.1 depends on Elasticsearch 6.8.1 jar. Your dependencies are overriding that somewhere, that is why it says `elasticsearch: 2.4.6 (managed from 6.8.1)`. Also, please don't post images of text as they are hardly readable and not searchable. Instead paste the text and format it with `` icon. Check the preview window. Your application's pom file would be useful to debug this issue. ---
**Author:** ![iti](https://avatars.discourse-cdn.com/v4/letter/i/b19c9b/32.png) [@iti](https://discuss.elastic.co/u/iti)\ **Post date:** [August 17, 2019, 9:59pm UTC](https://discuss.elastic.co/t/java-lang-classnotfoundexception-org-elasticsearch-search-aggregations-metrics-cardinality-parsedcardinality/194304/10 "2019-08-17T21:59:43Z")
I am using Spring Boot Starter 1.5.1. It bundles with elasticsearch 2.4.6 jar, that is why 2.4.6 is the managed version. But HLRC 6.8.1 is not smart enough to use the overiding jar. (Strange though, if I lower the Elasticsearch jar to 6.8 instead of 7.x. 6.8.1 HLRC does know to use the 6.8 jar, there is no cardinality error.) So, what is the problem? Latest Spring Boot 2.1.7 is using Elasticsearch 6.4. So, if I upgrade, cardinality should be there. But some other error will happened. So, I still want to know why overriding jar did not get pick up by 6.8 HLRC correctly when ES jar is 7.x (use 6.8.x ES jar and 6.8.x HLRC jar does not have cardinality error. But when connecting to 7.x ES, some of the aggregation result on 7.X ES is not correct.) BTW, the image I posted is not a text, it is a window print screen(It is not a text screen). I have no way of formatting it. ---
**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:** [August 18, 2019, 4:23am UTC](https://discuss.elastic.co/t/java-lang-classnotfoundexception-org-elasticsearch-search-aggregations-metrics-cardinality-parsedcardinality/194304/11 "2019-08-18T04:23:40Z")
When using springboot with elasticsearch, you need to be explicit with some transitive dependencies as SpringBoot declares a version 6.4... Basically you can put this in your `pom.xml`: ```auto 7.3.0 ``` See documentation here: [https://docs.spring.io/spring-boot/docs/current/reference/html/howto-build.html#howto-customize-dependency-versions](https://docs.spring.io/spring-boot/docs/current/reference/html/howto-build.html#howto-customize-dependency-versions) ---
**Author:** ![iti](https://avatars.discourse-cdn.com/v4/letter/i/b19c9b/32.png) [@iti](https://discuss.elastic.co/u/iti)\ **Post date:** [August 18, 2019, 8:59am UTC](https://discuss.elastic.co/t/java-lang-classnotfoundexception-org-elasticsearch-search-aggregations-metrics-cardinality-parsedcardinality/194304/12 "2019-08-18T08:59:48Z")
Tried that, but the error still the same. I search online and the forum, spring boot and elasticsearch with NoClassDefFoundError so far no solution. Adding the property just make the managed version to be 7.x. But the error remains. ---
**Author:** ![iti](https://avatars.discourse-cdn.com/v4/letter/i/b19c9b/32.png) [@iti](https://discuss.elastic.co/u/iti)\ **Post date:** [August 18, 2019, 11:34pm UTC](https://discuss.elastic.co/t/java-lang-classnotfoundexception-org-elasticsearch-search-aggregations-metrics-cardinality-parsedcardinality/194304/13 "2019-08-18T23:34:59Z")
@javanna @rjernst @dadoonet I think I have figured out the NoClassDefFoundError problem. ``` In ES 7.x Lib, there is: import org.elasticsearch.search.aggregations.metrics.CardinalityAggregationBuilder; import org.elasticsearch.search.aggregations.metrics.ParsedCardinality; In ES 6.x lib, it is: import org.elasticsearch.search.aggregations.metrics.cardinality.CardinalityAggregationBuilder; import org.elasticsearch.search.aggregations.metrics.cardinality.ParsedCardinality; So, when using 6.x HLRC, it is expecting org.elasticsearch.search.aggregations.metrics.cardinality.ParsedCardinality. But I am using ES 7.x lib which does not have this class, but the org.elasticsearch.search.aggregations.metrics.ParsedCardinality ``` Is there any reason for the name change from 6.x to 7.x? I did not see it in the breaking changes note. I have no easy way of getting around this problem. Lower ES lib to 6.x will have totalHit() as 0 when accessing ES 7.x, since 7.x change the totalHit() to an object with value and relation, 6.x just a long value. Anyway [Elastic.co](http://Elastic.co) can change HLRC 6.x lib or 7.x ES lib to make HLRC 6.x compatible with 7.x ES? Thanks ---
**Author:** ![javanna](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/javanna/32/4698_2.png) [@javanna](https://discuss.elastic.co/u/javanna)\ **Post date:** [August 22, 2019, 11:11am UTC](https://discuss.elastic.co/t/java-lang-classnotfoundexception-org-elasticsearch-search-aggregations-metrics-cardinality-parsedcardinality/194304/14 "2019-08-22T11:11:54Z")
It is true that the classes changed package in 7.x, but I don't think that is a breaking change. If you use the 6.x client, it depends on elasticsearch 6.x which has the classes in the right place. If you use the 7.x client, it depends on elasticsearch 7.x which has the classes in the new location, still working though. I suspect that you are using two different versions of client/server libraries. We said that if you send requests to both 6.x and 7.x, you should keep on using the 6.x client, which depends on 6.x libraries. That should work. ---
**Author:** ![iti](https://avatars.discourse-cdn.com/v4/letter/i/b19c9b/32.png) [@iti](https://discuss.elastic.co/u/iti)\ **Post date:** [August 22, 2019, 1:05pm UTC](https://discuss.elastic.co/t/java-lang-classnotfoundexception-org-elasticsearch-search-aggregations-metrics-cardinality-parsedcardinality/194304/15 "2019-08-22T13:05:15Z")
@javanna Thanks for the reply. I think in my previous reply, I said that " Lower ES lib to 6.x will have totalHit() as 0 when accessing ES 7.x, since 7.x change the totalHit() to an object with value and relation, 6.x just a long value." So, using both 6.x client and lib does not work. I think this one you can test it out easily. ---
**Author:** ![javanna](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/javanna/32/4698_2.png) [@javanna](https://discuss.elastic.co/u/javanna)\ **Post date:** [August 22, 2019, 1:30pm UTC](https://discuss.elastic.co/t/java-lang-classnotfoundexception-org-elasticsearch-search-aggregations-metrics-cardinality-parsedcardinality/194304/16 "2019-08-22T13:30:50Z")
I see what you mean, the point is that we would never recommend to manually change the libs you use. 6.x works with 6.x, it will give unexpected results when used with 7.x libraries, like you are discovering. When you have problems with total hits, you are hitting this bug: [https://github.com/elastic/elasticsearch/issues/43925](https://github.com/elastic/elasticsearch/issues/43925) . I would suggest to monitor that issue to see when progress is made on it. Meanwhile, I am afraid you will need to use the 7.x client to talk to 7.x nodes, and the 6.x client to talk to 6.x nodes. IN fact, this is the recommended approach and mixed clusters are really only needed while you are upgrading, which is a temporary situation. ---
**Author:** ![iti](https://avatars.discourse-cdn.com/v4/letter/i/b19c9b/32.png) [@iti](https://discuss.elastic.co/u/iti)\ **Post date:** [August 22, 2019, 5:04pm UTC](https://discuss.elastic.co/t/java-lang-classnotfoundexception-org-elasticsearch-search-aggregations-metrics-cardinality-parsedcardinality/194304/17 "2019-08-22T17:04:38Z")
Thanks. Looks like I just have to wait for 6.8.x HLRC for the fix. ---
**Author:** ![iti](https://avatars.discourse-cdn.com/v4/letter/i/b19c9b/32.png) [@iti](https://discuss.elastic.co/u/iti)\ **Post date:** [September 12, 2019, 9:11pm UTC](https://discuss.elastic.co/t/java-lang-classnotfoundexception-org-elasticsearch-search-aggregations-metrics-cardinality-parsedcardinality/194304/18 "2019-09-12T21:11:33Z")
With 6.8.3 HLRC and 6.8.3 ES lib. I was able to access 6.x and 7.x ES with correct TotalHit() and no Cardinality class not found error. Thanks for all the help. ---
**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\ **Post date:** [October 10, 2019, 9:11pm UTC](https://discuss.elastic.co/t/java-lang-classnotfoundexception-org-elasticsearch-search-aggregations-metrics-cardinality-parsedcardinality/194304/19 "2019-10-10T21:11:34Z")
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