# BulkProcessor creation using RestHighLevelClient compilation error on ES5.6 **URL:** \ **Category:** Elasticsearch\ **Created:** [July 18, 2018, 2:07pm UTC](https://discuss.elastic.co/t/bulkprocessor-creation-using-resthighlevelclient-compilation-error-on-es5-6/140573 "2018-07-18T14:07:37Z")\ **Posts on this page:** 1\ **Showing post:** 2
**Author:** ![Rappahannock](https://avatars.discourse-cdn.com/v4/letter/r/dc4da7/32.png) [@Rappahannock](https://discuss.elastic.co/u/Rappahannock)\ **Post date:** [July 18, 2018, 2:12pm UTC](https://discuss.elastic.co/t/bulkprocessor-creation-using-resthighlevelclient-compilation-error-on-es5-6/140573/2 "2018-07-18T14:12:19Z")
Similar problem has been discussed in the following topics: > [@Headache with RestHighLevelClient and bulkprocessor](https://discuss.elastic.co/t/headache-with-resthighlevelclient-and-bulkprocessor/106072): > > BulkProcessor.Builder builder = BulkProcessor.builder(client::bulkAsync, new BulkProcessorListener()); this line is complaining The target type of this expression must be a functional interface the error is this part: builder(client::bulkAsync, any idea? please help import org.elasticsearch.client.RestHighLevelClient; RestHighLevelClient client; environment: java 8, eclipse > [@\[BUG\] You can use BulkProcessor with high-level client in 5.6 version](https://discuss.elastic.co/t/bug-you-can-use-bulkprocessor-with-high-level-client-in-5-6-version/123602): > > Hi team, Thanks in advance I try to create a BulkProcessor like [https://www.elastic.co/guide/en/elasticsearch/client/java-rest/5.6/java-rest-high-document-bulk.html](https://www.elastic.co/guide/en/elasticsearch/client/java-rest/5.6/java-rest-high-document-bulk.html) with the high-level client in the version 5.6 but I get this compilation error at this point: ... RestHighLevelClient rHLClient ... BulkProcessor bulkProcessor = BulkProcessor.builder(rHLClient::bulkAsync, listener,threadPool).build(); "Client is not a functional interface" If there is a better way to use that, please advis… But I don't find there how to solve my problem. This comment suggests that it's a bug in Eclipse IDE: [[BUG] You can use BulkProcessor with high-level client in 5.6 version - #9 by juanaramis](https://discuss.elastic.co/t/bug-you-can-use-bulkprocessor-with-high-level-client-in-5-6-version/123602/9) But I compile in another IDE, also I compile from command line using maven 3.0.4. Here is an extract from my maven compilation log: ```auto Apache Maven 3.0.4 (r1232337; 2012-01-17 12:44:56+0400) Maven home: F:\1_Tools\apache-maven-3.0.4 Java version: 1.8.0_77, vendor: Oracle Corporation Java home: C:\Program Files\Java\jdk1.8.0_77\jre Default locale: en_US, platform encoding: Cp1251 OS name: "windows 7", version: "6.1", arch: "amd64", family: "dos" [INFO] Error stacktraces are turned on. [DEBUG] Reading global settings from F:\1_Tools\apache-maven-3.0.4\conf\settings.xml [DEBUG] Reading user settings from C:\...\.m2\settings.xml [DEBUG] Using local repository at C:\m2 [DEBUG] Using manager EnhancedLocalRepositoryManager with priority 10 for C:\m2 ... [INFO] ------------------------------------------------------------- [ERROR] COMPILATION ERROR : [INFO] ------------------------------------------------------------- [ERROR] /F:/GIT/0_Examples/test-bulkprocessor/src/main/java/com/rappahannock/elasticsearch/ESConfiguration.java: incompatible types: org.elasticsearch.client.Client is not a functional interface multiple non-overriding abstract methods found in interface org.elasticsearch.client.Client [INFO] 1 error [INFO] ------------------------------------------------------------- [INFO] ------------------------------------------------------------------------ [INFO] BUILD FAILURE [INFO] ------------------------------------------------------------------------ [INFO] Total time: 7.067s [INFO] Finished at: Wed Jul 18 17:28:21 GET 2018 [INFO] Final Memory: 26M/306M [INFO] ------------------------------------------------------------------------ [ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.1:compile (default-compile) on project test-bulkprocessor: Compilation failure [ERROR] /F:/GIT/0_Examples/test-bulkprocessor/src/main/java/com/rappahannock/elasticsearch/ESConfiguration.java: incompatible types: org.elasticsearch.client.Client is not a functional interface [ERROR] multiple non-overriding abstract methods found in interface org.elasticsearch.client.Client [ERROR] -> [Help 1] org.apache.maven.lifecycle.LifecycleExecutionException: Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.1:compile (default-compile) on project test-bulkprocessor: Compilation failure /F:/GIT/0_Examples/test-bulkprocessor/src/main/java/com/rappahannock/elasticsearch/ESConfiguration.java: incompatible types: org.elasticsearch.client.Client is not a functional interface multiple non-overriding abstract methods found in interface org.elasticsearch.client.Client at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:213) at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:153) at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:145) at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:84) at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:59) at org.apache.maven.lifecycle.internal.LifecycleStarter.singleThreadedBuild(LifecycleStarter.java:183) at org.apache.maven.lifecycle.internal.LifecycleStarter.execute(LifecycleStarter.java:161) at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:320) at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:156) at org.apache.maven.cli.MavenCli.execute(MavenCli.java:537) at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:196) at org.apache.maven.cli.MavenCli.main(MavenCli.java:141) 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:498) at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced(Launcher.java:290) at org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:230) at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode(Launcher.java:409) at org.codehaus.plexus.classworlds.launcher.Launcher.main(Launcher.java:352) Caused by: org.apache.maven.plugin.compiler.CompilationFailureException: Compilation failure /F:/GIT/0_Examples/test-bulkprocessor/src/main/java/com/rappahannock/elasticsearch/ESConfiguration.java: incompatible types: org.elasticsearch.client.Client is not a functional interface multiple non-overriding abstract methods found in interface org.elasticsearch.client.Client at org.apache.maven.plugin.compiler.AbstractCompilerMojo.execute(AbstractCompilerMojo.java:858) at org.apache.maven.plugin.compiler.CompilerMojo.execute(CompilerMojo.java:129) at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:101) at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:209) ... 19 more ``` --- _[View the full topic](https://discuss.elastic.co/t/bulkprocessor-creation-using-resthighlevelclient-compilation-error-on-es5-6/140573)._