IndicesClient.create throwing exception

[babu.subburathinam]

I am attempting to create an index as follows:

public class CreateIndexTest {

    @Test
    public void testIndexCreationWithMapping() throws IOException {
        final RestClientBuilder restClientBuilder =
            RestClient.builder(new HttpHost("localhost", 9200));
        final RestHighLevelClient esClient =
            new RestHighLevelClient(restClientBuilder);
        String indexName = "students";
        String typeName = "student";
        final CreateIndexRequest createIndexRequest =
            new CreateIndexRequest(
                indexName
            )
        ;
        createIndexRequest.settings(
            Settings.builder()
                .put("index.number_of_shards", 1)
                .put("index.number_of_replicas", 1)
        );
        final String mapping =
            "{" +
            "   \"mappings\": {" +
            "       \"student\": {" +
            "           \"properties\": {" +
            "               \"student_id\": {" +
            "                   \"type\": \"long\"" +
            "               }" +
            "           }" +
            "       }" +
            "   }" +
            "}"
        ;
        createIndexRequest.mapping(typeName, mapping, XContentType.JSON);
        esClient.indices().create(createIndexRequest);
    }
}

But this results in the following exception (in create() call on the last line of the snippet above):

java.lang.NoSuchMethodError: org.elasticsearch.action.admin.indices.create.CreateIndexResponse.fromXContent(Lorg/elasticsearch/common/xcontent/XContentParser;)Lorg/elasticsearch/action/admin/indices/create/CreateIndexResponse;
	at java.base/java.lang.invoke.MethodHandleNatives.resolve(Native Method)
	at java.base/java.lang.invoke.MemberName$Factory.resolve(MemberName.java:1041)
	at java.base/java.lang.invoke.MemberName$Factory.resolveOrFail(MemberName.java:1066)
	at java.base/java.lang.invoke.MethodHandles$Lookup.resolveOrFail(MethodHandles.java:2040)
	at java.base/java.lang.invoke.MethodHandles$Lookup.linkMethodHandleConstant(MethodHandles.java:2453)
	at java.base/java.lang.invoke.MethodHandleNatives.linkMethodHandleConstant(MethodHandleNatives.java:501)
	at org.elasticsearch.client.IndicesClient.create(IndicesClient.java:77)
	at x.CreateIndexTest.testIndexCreationWithMapping(CreateIndexTest.java:49)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.base/java.lang.reflect.Method.invoke(Method.java:564)
	at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)

I am using elasticsearch-rest-high-level-client version 6.2.4

compile('org.elasticsearch.client:elasticsearch-rest-high-level-client:6.2.4')

with a server of the same version:

$ curl localhost:9200/
{
  "name" : "SNDFUfO",
  "cluster_name" : "elasticsearch",
  "cluster_uuid" : "ZffUtr4PQxaU2aMdaCEZnQ",
  "version" : {
    "number" : "6.2.4",
    "build_hash" : "ccec39f",
    "build_date" : "2018-04-12T20:37:28.497551Z",
    "build_snapshot" : false,
    "lucene_version" : "7.2.1",
    "minimum_wire_compatibility_version" : "5.6.0",
    "minimum_index_compatibility_version" : "5.0.0"
  },
  "tagline" : "You Know, for Search"
}

Java version is 9.0:

$ java -version
openjdk version "9.0.4"
OpenJDK Runtime Environment (build 9.0.4+11)
OpenJDK 64-Bit Server VM (build 9.0.4+11, mixed mode)

Appreciate any pointers on what I could be doing wrong.

Note: This question also pertains to this same exception, but version incompatibility was the issue there. In my case, the client and server are the same version.

[javanna (Luca Cavanna)]

The error is not about incompatibility between server and client. The problem is all in the client classpath, where the rest high-level client is looking for a method CreateIndexResponse.fromXContent that was there at compile time, but it's not available at runtime. Seems that you are pulling a previous version of Elasticsearch in your classpath for some reason, not sure where that comes from but the elasticsearch jar in your classpath is certainly not 6.2.4 that the 6.2.4 client depends on.

Cheers
Luca