# Cause: Unable to find a javac compiler **URL:** \ **Category:** Elasticsearch\ **Created:** [October 4, 2011, 1:14pm UTC](https://discuss.elastic.co/t/cause-unable-to-find-a-javac-compiler/5512 "2011-10-04T13:14:13Z")\ **Posts on this page:** 4\ **Page:** 1
**Author:** ![khinester](https://avatars.discourse-cdn.com/v4/letter/k/90db22/32.png) [@khinester](https://discuss.elastic.co/u/khinester)\ **Post date:** [October 4, 2011, 1:14pm UTC](https://discuss.elastic.co/t/cause-unable-to-find-a-javac-compiler/5512/1 "2011-10-04T13:14:13Z")
Hello, I have just setup a test AWS server and have cloned elesticsearch. $ cd packages $ git clone git://github.com/elasticsearch/elasticsearch.git && cd elasticsearch $ ./gradlew --debug release ... 12:55:53.968 [DEBUG] [org.gradle.api.internal.project.ant.AntLoggingAdapter] fileset: Setup scanner in dir /home/ec2-user/packages/elasticsearch/modules/test/ testng/src/main/java with patternSet{ includes: [] excludes: [] } 12:55:53.989 [DEBUG] [org.gradle.api.internal.tasks.execution.ExecuteAtMostOnceTaskExecuter] Finished executing task ':test-testng:compileJava' 12:55:54.005 [ERROR] [org.gradle.BuildExceptionReporter] 12:55:54.007 [ERROR] [org.gradle.BuildExceptionReporter] FAILURE: Build failed with an exception. 12:55:54.010 [ERROR] [org.gradle.BuildExceptionReporter] 12:55:54.010 [ERROR] [org.gradle.BuildExceptionReporter] \* What went wrong: 12:55:54.011 [ERROR] [org.gradle.BuildExceptionReporter] Execution failed for task ':test-testng:compileJava'. 12:55:54.014 [ERROR] [org.gradle.BuildExceptionReporter] Cause: Unable to find a javac compiler; 12:55:54.014 [ERROR] [org.gradle.BuildExceptionReporter] com.sun.tools.javac.Main is not on the classpath. 12:55:54.015 [ERROR] [org.gradle.BuildExceptionReporter] Perhaps JAVA\_HOME does not point to the JDK. 12:55:54.017 [ERROR] [org.gradle.BuildExceptionReporter] It is currently set to "/usr/lib/jvm/java-1.6.0-openjdk-1.6.0.0.x86\_64/jre" 12:55:54.017 [ERROR] [org.gradle.BuildExceptionReporter] 12:55:54.022 [ERROR] [org.gradle.BuildExceptionReporter] \* Exception is: 12:55:54.023 [ERROR] [org.gradle.BuildExceptionReporter] org.gradle.api.tasks.TaskExecutionException: Execution failed for task ':test-testng:compileJava'. 12:55:54.023 [ERROR] [org.gradle.BuildExceptionReporter] at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.executeActions(ExecuteActionsTaskExecuter.java: 71) 12:55:54.024 [ERROR] [org.gradle.BuildExceptionReporter] at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.execute(ExecuteActionsTaskExecuter.java: 48) 12:55:54.024 [ERROR] [org.gradle.BuildExceptionReporter] at org.gradle.api.internal.tasks.execution.PostExecutionAnalysisTaskExecuter.execute(PostExecutionAnalysisTaskExecuter.java: 34) 12:55:54.031 [ERROR] [org.gradle.BuildExceptionReporter] at org.gradle.api.internal.tasks.execution.SkipUpToDateTaskExecuter.execute(SkipUpToDateTaskExecuter.java: 55) 12:55:54.032 [ERROR] [org.gradle.BuildExceptionReporter] at org.gradle.api.internal.tasks.execution.ValidatingTaskExecuter.execute(ValidatingTaskExecuter.java: 57) 12:55:54.032 [ERROR] [org.gradle.BuildExceptionReporter] at org.gradle.api.internal.tasks.execution.SkipEmptySourceFilesTaskExecuter.execute(SkipEmptySourceFilesTaskExecuter.java: 41) 12:55:54.032 [ERROR] [org.gradle.BuildExceptionReporter] at org.gradle.api.internal.tasks.execution.SkipTaskWithNoActionsExecuter.execute(SkipTaskWithNoActionsExecuter.java: 51) 12:55:54.033 [ERROR] [org.gradle.BuildExceptionReporter] at org.gradle.api.internal.tasks.execution.SkipOnlyIfTaskExecuter.execute(SkipOnlyIfTaskExecuter.java: 52) 12:55:54.036 [ERROR] [org.gradle.BuildExceptionReporter] at org.gradle.api.internal.tasks.execution.ExecuteAtMostOnceTaskExecuter.execute(ExecuteAtMostOnceTaskExecuter.java: 42) 12:55:54.036 [ERROR] [org.gradle.BuildExceptionReporter] at org.gradle.api.internal.AbstractTask.execute(AbstractTask.java:237) 12:55:54.037 [ERROR] [org.gradle.BuildExceptionReporter] at org.gradle.execution.DefaultTaskGraphExecuter.executeTask(DefaultTaskGraphExecuter.java: 167) 12:55:54.037 [ERROR] [org.gradle.BuildExceptionReporter] at org.gradle.execution.DefaultTaskGraphExecuter.doExecute(DefaultTaskGraphExecuter.java: 160) 12:55:54.040 [ERROR] [org.gradle.BuildExceptionReporter] at org.gradle.execution.DefaultTaskGraphExecuter.execute(DefaultTaskGraphExecuter.java: 78) 12:55:54.040 [ERROR] [org.gradle.BuildExceptionReporter] at org.gradle.execution.TaskNameResolvingBuildExecuter.execute(TaskNameResolvingBuildExecuter.java: 113) 12:55:54.041 [ERROR] [org.gradle.BuildExceptionReporter] at org.gradle.execution.DelegatingBuildExecuter.execute(DelegatingBuildExecuter.java: 54) 12:55:54.041 [ERROR] [org.gradle.BuildExceptionReporter] at org.gradle.initialization.DefaultGradleLauncher.doBuildStages(DefaultGradleLauncher.java: 158) 12:55:54.042 [ERROR] [org.gradle.BuildExceptionReporter] at org.gradle.initialization.DefaultGradleLauncher.doBuild(DefaultGradleLauncher.java: 112) 12:55:54.042 [ERROR] [org.gradle.BuildExceptionReporter] at org.gradle.initialization.DefaultGradleLauncher.run(DefaultGradleLauncher.java: 80) 12:55:54.045 [ERROR] [org.gradle.BuildExceptionReporter] at org.gradle.launcher.RunBuildAction.execute(RunBuildAction.java:41) 12:55:54.045 [ERROR] [org.gradle.BuildExceptionReporter] at org.gradle.launcher.RunBuildAction.execute(RunBuildAction.java:27) 12:55:54.046 [ERROR] [org.gradle.BuildExceptionReporter] at org.gradle.launcher.ExceptionReportingAction.execute(ExceptionReportingAction.java: 32) 12:55:54.046 [ERROR] [org.gradle.BuildExceptionReporter] at org.gradle.launcher.ExceptionReportingAction.execute(ExceptionReportingAction.java: 21) 12:55:54.049 [ERROR] [org.gradle.BuildExceptionReporter] at org.gradle.launcher.CommandLineActionFactory $WithLoggingAction.execute(CommandLineActionFactory.java:219) 12:55:54.050 [ERROR] [org.gradle.BuildExceptionReporter] at org.gradle.launcher.CommandLineActionFactory $WithLoggingAction.execute(CommandLineActionFactory.java:203) 12:55:54.050 [ERROR] [org.gradle.BuildExceptionReporter] at org.gradle.launcher.Main.execute(Main.java:55) 12:55:54.051 [ERROR] [org.gradle.BuildExceptionReporter] at org.gradle.launcher.Main.main(Main.java:40) 12:55:54.051 [ERROR] [org.gradle.BuildExceptionReporter] at org.gradle.launcher.ProcessBootstrap.runNoExit(ProcessBootstrap.java: 46) 12:55:54.051 [ERROR] [org.gradle.BuildExceptionReporter] at org.gradle.launcher.ProcessBootstrap.run(ProcessBootstrap.java:28) 12:55:54.052 [ERROR] [org.gradle.BuildExceptionReporter] at org.gradle.launcher.GradleMain.main(GradleMain.java:24) 12:55:54.052 [ERROR] [org.gradle.BuildExceptionReporter] at org.gradle.wrapper.BootstrapMainStarter.start(BootstrapMainStarter.java: 33) 12:55:54.058 [ERROR] [org.gradle.BuildExceptionReporter] at org.gradle.wrapper.Wrapper.execute(Wrapper.java:87) 12:55:54.059 [ERROR] [org.gradle.BuildExceptionReporter] at org.gradle.wrapper.GradleWrapperMain.main(GradleWrapperMain.java:37) 12:55:54.059 [ERROR] [org.gradle.BuildExceptionReporter] Caused by: : Unable to find a javac compiler; 12:55:54.059 [ERROR] [org.gradle.BuildExceptionReporter] com.sun.tools.javac.Main is not on the classpath. 12:55:54.060 [ERROR] [org.gradle.BuildExceptionReporter] Perhaps JAVA\_HOME does not point to the JDK. 12:55:54.060 [ERROR] [org.gradle.BuildExceptionReporter] It is currently set to "/usr/lib/jvm/java-1.6.0-openjdk-1.6.0.0.x86\_64/jre" 12:55:54.060 [ERROR] [org.gradle.BuildExceptionReporter] at org.apache.tools.ant.taskdefs.compilers.CompilerAdapterFactory.getCompiler(CompilerAdapterFactory.java: 128) 12:55:54.061 [ERROR] [org.gradle.BuildExceptionReporter] at org.apache.tools.ant.taskdefs.Javac.findSupportedFileExtensions(Javac.java: 961) 12:55:54.061 [ERROR] [org.gradle.BuildExceptionReporter] at org.apache.tools.ant.taskdefs.Javac.scanDir(Javac.java:938) 12:55:54.067 [ERROR] [org.gradle.BuildExceptionReporter] at org.apache.tools.ant.taskdefs.Javac.execute(Javac.java:909) 12:55:54.068 [ERROR] [org.gradle.BuildExceptionReporter] at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:291) 12:55:54.068 [ERROR] [org.gradle.BuildExceptionReporter] at org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java: 106) 12:55:54.069 [ERROR] [org.gradle.BuildExceptionReporter] at org.gradle.api.internal.project.ant.BasicAntBuilder.nodeCompleted(BasicAntBuilder.java: 71) 12:55:54.069 [ERROR] [org.gradle.BuildExceptionReporter] at org.gradle.api.internal.project.ant.BasicAntBuilder.doInvokeMethod(BasicAntBuilder.java: 86) 12:55:54.069 [ERROR] [org.gradle.BuildExceptionReporter] at org.gradle.api.internal.project.DefaultAntBuilder.super $3$invokeMethod(DefaultAntBuilder.groovy) 12:55:54.070 [ERROR] [org.gradle.BuildExceptionReporter] at org.gradle.api.internal.project.DefaultAntBuilder.invokeMethod(DefaultAntBuilder.groovy: 37) 12:55:54.070 [ERROR] [org.gradle.BuildExceptionReporter] at org.gradle.api.internal.tasks.compile.AntJavaCompiler.execute(AntJavaCompiler.groovy: 64) 12:55:54.070 [ERROR] [org.gradle.BuildExceptionReporter] at org.gradle.api.internal.tasks.compile.IncrementalJavaSourceCompiler.execute(IncrementalJavaSourceCompiler.java: 73) 12:55:54.071 [ERROR] [org.gradle.BuildExceptionReporter] at org.gradle.api.tasks.compile.Compile.compile(Compile.java:55) 12:55:54.071 [ERROR] [org.gradle.BuildExceptionReporter] at org.gradle.api.internal.BeanDynamicObject.invokeMethod(BeanDynamicObject.java: 158) 12:55:54.077 [ERROR] [org.gradle.BuildExceptionReporter] at org.gradle.api.internal.CompositeDynamicObject.invokeMethod(CompositeDynamicObject.java: 93) 12:55:54.078 [ERROR] [org.gradle.BuildExceptionReporter] at org.gradle.api.tasks.compile.Compile\_Decorated.invokeMethod(Unknown Source) 12:55:54.078 [ERROR] [org.gradle.BuildExceptionReporter] at org.gradle.util.ReflectionUtil.invoke(ReflectionUtil.groovy:23) 12:55:54.079 [ERROR] [org.gradle.BuildExceptionReporter] at org.gradle.api.internal.project.taskfactory.AnnotationProcessingTaskFactory $2.execute(AnnotationProcessingTaskFactory.java:129) 12:55:54.079 [ERROR] [org.gradle.BuildExceptionReporter] at org.gradle.api.internal.project.taskfactory.AnnotationProcessingTaskFactory $2.execute(AnnotationProcessingTaskFactory.java:127) 12:55:54.079 [ERROR] [org.gradle.BuildExceptionReporter] at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.executeActions(ExecuteActionsTaskExecuter.java: 63) 12:55:54.080 [ERROR] [org.gradle.BuildExceptionReporter] ... 31 more 12:55:54.080 [ERROR] [org.gradle.BuildExceptionReporter] 12:55:54.087 [LIFECYCLE] [org.gradle.BuildResultLogger] 12:55:54.087 [LIFECYCLE] [org.gradle.BuildResultLogger] BUILD FAILED 12:55:54.088 [LIFECYCLE] [org.gradle.BuildResultLogger] 12:55:54.088 [LIFECYCLE] [org.gradle.BuildResultLogger] Total time: 1 mins 45.891 secs $ java -version java version "1.6.0\_20" OpenJDK Runtime Environment (IcedTea6 1.9.8) (amazon-52.1.9.8.36.amzn1- x86\_64) OpenJDK 64-Bit Server VM (build 19.0-b09, mixed mode) $ echo $JAVA\_HOME /usr/lib/jvm/jre Any advise much appreciated. ---
**Author:** ![kimchy](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/kimchy/32/44952_2.png) [@kimchy](https://discuss.elastic.co/u/kimchy)\ **Post date:** [October 4, 2011, 2:05pm UTC](https://discuss.elastic.co/t/cause-unable-to-find-a-javac-compiler/5512/2 "2011-10-04T14:05:10Z")
In order to build elasticsearch, you need the JDK (Java Development Kit), not a JRE (the Java Runtime). Instead of building it, why not just download an official release? On Tue, Oct 4, 2011 at 3:14 PM, khinester [norman.khine@gmail.com](mailto:norman.khine@gmail.com) wrote: > Hello, > I have just setup a test AWS server and have cloned elesticsearch. > > $ cd packages > $ git clone git://github.com/elasticsearch/elasticsearch.git && cd > elasticsearch > $ ./gradlew --debug release > > ... > > 12:55:53.968 [DEBUG] > [org.gradle.api.internal.project.ant.AntLoggingAdapter] fileset: Setup > scanner in dir /home/ec2-user/packages/elasticsearch/modules/test/ > testng/src/main/java with patternSet{ includes: excludes: } > 12:55:53.989 [DEBUG] > [org.gradle.api.internal.tasks.execution.ExecuteAtMostOnceTaskExecuter] > Finished executing task ':test-testng:compileJava' > 12:55:54.005 [ERROR] [org.gradle.BuildExceptionReporter] > 12:55:54.007 [ERROR] [org.gradle.BuildExceptionReporter] FAILURE: > Build failed with an exception. > 12:55:54.010 [ERROR] [org.gradle.BuildExceptionReporter] > 12:55:54.010 [ERROR] [org.gradle.BuildExceptionReporter] \* What went > wrong: > 12:55:54.011 [ERROR] [org.gradle.BuildExceptionReporter] Execution > failed for task ':test-testng:compileJava'. > 12:55:54.014 [ERROR] [org.gradle.BuildExceptionReporter] Cause: Unable > to find a javac compiler; > 12:55:54.014 [ERROR] [org.gradle.BuildExceptionReporter] > com.sun.tools.javac.Main is not on the classpath. > 12:55:54.015 [ERROR] [org.gradle.BuildExceptionReporter] Perhaps > JAVA\_HOME does not point to the JDK. > 12:55:54.017 [ERROR] [org.gradle.BuildExceptionReporter] It is > currently set to "/usr/lib/jvm/java-1.6.0-openjdk-1.6.0.0.x86\_64/jre" > 12:55:54.017 [ERROR] [org.gradle.BuildExceptionReporter] > 12:55:54.022 [ERROR] [org.gradle.BuildExceptionReporter] \* Exception > is: > 12:55:54.023 [ERROR] [org.gradle.BuildExceptionReporter] > org.gradle.api.tasks.TaskExecutionException: Execution failed for task > ':test-testng:compileJava'. > 12:55:54.023 [ERROR] [org.gradle.BuildExceptionReporter] at > > org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.executeActions(ExecuteActionsTaskExecuter.java: > 71) > 12:55:54.024 [ERROR] [org.gradle.BuildExceptionReporter] at > > org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.execute(ExecuteActionsTaskExecuter.java: > 48) > 12:55:54.024 [ERROR] [org.gradle.BuildExceptionReporter] at > > org.gradle.api.internal.tasks.execution.PostExecutionAnalysisTaskExecuter.execute(PostExecutionAnalysisTaskExecuter.java: > 34) > 12:55:54.031 [ERROR] [org.gradle.BuildExceptionReporter] at > > org.gradle.api.internal.tasks.execution.SkipUpToDateTaskExecuter.execute(SkipUpToDateTaskExecuter.java: > 55) > 12:55:54.032 [ERROR] [org.gradle.BuildExceptionReporter] at > > org.gradle.api.internal.tasks.execution.ValidatingTaskExecuter.execute(ValidatingTaskExecuter.java: > 57) > 12:55:54.032 [ERROR] [org.gradle.BuildExceptionReporter] at > > org.gradle.api.internal.tasks.execution.SkipEmptySourceFilesTaskExecuter.execute(SkipEmptySourceFilesTaskExecuter.java: > 41) > 12:55:54.032 [ERROR] [org.gradle.BuildExceptionReporter] at > > org.gradle.api.internal.tasks.execution.SkipTaskWithNoActionsExecuter.execute(SkipTaskWithNoActionsExecuter.java: > 51) > 12:55:54.033 [ERROR] [org.gradle.BuildExceptionReporter] at > > org.gradle.api.internal.tasks.execution.SkipOnlyIfTaskExecuter.execute(SkipOnlyIfTaskExecuter.java: > 52) > 12:55:54.036 [ERROR] [org.gradle.BuildExceptionReporter] at > > org.gradle.api.internal.tasks.execution.ExecuteAtMostOnceTaskExecuter.execute(ExecuteAtMostOnceTaskExecuter.java: > 42) > 12:55:54.036 [ERROR] [org.gradle.BuildExceptionReporter] at > org.gradle.api.internal.AbstractTask.execute(AbstractTask.java:237) > 12:55:54.037 [ERROR] [org.gradle.BuildExceptionReporter] at > > org.gradle.execution.DefaultTaskGraphExecuter.executeTask(DefaultTaskGraphExecuter.java: > 167) > 12:55:54.037 [ERROR] [org.gradle.BuildExceptionReporter] at > > org.gradle.execution.DefaultTaskGraphExecuter.doExecute(DefaultTaskGraphExecuter.java: > 160) > 12:55:54.040 [ERROR] [org.gradle.BuildExceptionReporter] at > > org.gradle.execution.DefaultTaskGraphExecuter.execute(DefaultTaskGraphExecuter.java: > 78) > 12:55:54.040 [ERROR] [org.gradle.BuildExceptionReporter] at > > org.gradle.execution.TaskNameResolvingBuildExecuter.execute(TaskNameResolvingBuildExecuter.java: > 113) > 12:55:54.041 [ERROR] [org.gradle.BuildExceptionReporter] at > > org.gradle.execution.DelegatingBuildExecuter.execute(DelegatingBuildExecuter.java: > 54) > 12:55:54.041 [ERROR] [org.gradle.BuildExceptionReporter] at > > org.gradle.initialization.DefaultGradleLauncher.doBuildStages(DefaultGradleLauncher.java: > 158) > 12:55:54.042 [ERROR] [org.gradle.BuildExceptionReporter] at > > org.gradle.initialization.DefaultGradleLauncher.doBuild(DefaultGradleLauncher.java: > 112) > 12:55:54.042 [ERROR] [org.gradle.BuildExceptionReporter] at > > org.gradle.initialization.DefaultGradleLauncher.run(DefaultGradleLauncher.java: > 80) > 12:55:54.045 [ERROR] [org.gradle.BuildExceptionReporter] at > org.gradle.launcher.RunBuildAction.execute(RunBuildAction.java:41) > 12:55:54.045 [ERROR] [org.gradle.BuildExceptionReporter] at > org.gradle.launcher.RunBuildAction.execute(RunBuildAction.java:27) > 12:55:54.046 [ERROR] [org.gradle.BuildExceptionReporter] at > > org.gradle.launcher.ExceptionReportingAction.execute(ExceptionReportingAction.java: > 32) > 12:55:54.046 [ERROR] [org.gradle.BuildExceptionReporter] at > > org.gradle.launcher.ExceptionReportingAction.execute(ExceptionReportingAction.java: > 21) > 12:55:54.049 [ERROR] [org.gradle.BuildExceptionReporter] at > org.gradle.launcher.CommandLineActionFactory > $WithLoggingAction.execute(CommandLineActionFactory.java:219) > 12:55:54.050 [ERROR] [org.gradle.BuildExceptionReporter] at > org.gradle.launcher.CommandLineActionFactory > $WithLoggingAction.execute(CommandLineActionFactory.java:203) > 12:55:54.050 [ERROR] [org.gradle.BuildExceptionReporter] at > org.gradle.launcher.Main.execute(Main.java:55) > 12:55:54.051 [ERROR] [org.gradle.BuildExceptionReporter] at > org.gradle.launcher.Main.main(Main.java:40) > 12:55:54.051 [ERROR] [org.gradle.BuildExceptionReporter] at > org.gradle.launcher.ProcessBootstrap.runNoExit(ProcessBootstrap.java: > 46) > 12:55:54.051 [ERROR] [org.gradle.BuildExceptionReporter] at > org.gradle.launcher.ProcessBootstrap.run(ProcessBootstrap.java:28) > 12:55:54.052 [ERROR] [org.gradle.BuildExceptionReporter] at > org.gradle.launcher.GradleMain.main(GradleMain.java:24) > 12:55:54.052 [ERROR] [org.gradle.BuildExceptionReporter] at > org.gradle.wrapper.BootstrapMainStarter.start(BootstrapMainStarter.java: > 33) > 12:55:54.058 [ERROR] [org.gradle.BuildExceptionReporter] at > org.gradle.wrapper.Wrapper.execute(Wrapper.java:87) > 12:55:54.059 [ERROR] [org.gradle.BuildExceptionReporter] at > org.gradle.wrapper.GradleWrapperMain.main(GradleWrapperMain.java:37) > 12:55:54.059 [ERROR] [org.gradle.BuildExceptionReporter] Caused by: : > Unable to find a javac compiler; > 12:55:54.059 [ERROR] [org.gradle.BuildExceptionReporter] > com.sun.tools.javac.Main is not on the classpath. > 12:55:54.060 [ERROR] [org.gradle.BuildExceptionReporter] Perhaps > JAVA\_HOME does not point to the JDK. > 12:55:54.060 [ERROR] [org.gradle.BuildExceptionReporter] It is > currently set to "/usr/lib/jvm/java-1.6.0-openjdk-1.6.0.0.x86\_64/jre" > 12:55:54.060 [ERROR] [org.gradle.BuildExceptionReporter] at > > org.apache.tools.ant.taskdefs.compilers.CompilerAdapterFactory.getCompiler(CompilerAdapterFactory.java: > 128) > 12:55:54.061 [ERROR] [org.gradle.BuildExceptionReporter] at > org.apache.tools.ant.taskdefs.Javac.findSupportedFileExtensions(Javac.java: > 961) > 12:55:54.061 [ERROR] [org.gradle.BuildExceptionReporter] at > org.apache.tools.ant.taskdefs.Javac.scanDir(Javac.java:938) > 12:55:54.067 [ERROR] [org.gradle.BuildExceptionReporter] at > org.apache.tools.ant.taskdefs.Javac.execute(Javac.java:909) > 12:55:54.068 [ERROR] [org.gradle.BuildExceptionReporter] at > org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:291) > 12:55:54.068 [ERROR] [org.gradle.BuildExceptionReporter] at > org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java: > 106) > 12:55:54.069 [ERROR] [org.gradle.BuildExceptionReporter] at > > org.gradle.api.internal.project.ant.BasicAntBuilder.nodeCompleted(BasicAntBuilder.java: > 71) > 12:55:54.069 [ERROR] [org.gradle.BuildExceptionReporter] at > > org.gradle.api.internal.project.ant.BasicAntBuilder.doInvokeMethod(BasicAntBuilder.java: > 86) > 12:55:54.069 [ERROR] [org.gradle.BuildExceptionReporter] at > org.gradle.api.internal.project.DefaultAntBuilder.super > $3$invokeMethod(DefaultAntBuilder.groovy) > 12:55:54.070 [ERROR] [org.gradle.BuildExceptionReporter] at > > org.gradle.api.internal.project.DefaultAntBuilder.invokeMethod(DefaultAntBuilder.groovy: > 37) > 12:55:54.070 [ERROR] [org.gradle.BuildExceptionReporter] at > > org.gradle.api.internal.tasks.compile.AntJavaCompiler.execute(AntJavaCompiler.groovy: > 64) > 12:55:54.070 [ERROR] [org.gradle.BuildExceptionReporter] at > > org.gradle.api.internal.tasks.compile.IncrementalJavaSourceCompiler.execute(IncrementalJavaSourceCompiler.java: > 73) > 12:55:54.071 [ERROR] [org.gradle.BuildExceptionReporter] at > org.gradle.api.tasks.compile.Compile.compile(Compile.java:55) > 12:55:54.071 [ERROR] [org.gradle.BuildExceptionReporter] at > > org.gradle.api.internal.BeanDynamicObject.invokeMethod(BeanDynamicObject.java: > 158) > 12:55:54.077 [ERROR] [org.gradle.BuildExceptionReporter] at > > org.gradle.api.internal.CompositeDynamicObject.invokeMethod(CompositeDynamicObject.java: > 93) > 12:55:54.078 [ERROR] [org.gradle.BuildExceptionReporter] at > org.gradle.api.tasks.compile.Compile\_Decorated.invokeMethod(Unknown > Source) > 12:55:54.078 [ERROR] [org.gradle.BuildExceptionReporter] at > org.gradle.util.ReflectionUtil.invoke(ReflectionUtil.groovy:23) > 12:55:54.079 [ERROR] [org.gradle.BuildExceptionReporter] at > org.gradle.api.internal.project.taskfactory.AnnotationProcessingTaskFactory > $2.execute(AnnotationProcessingTaskFactory.java:129) > 12:55:54.079 [ERROR] [org.gradle.BuildExceptionReporter] at > org.gradle.api.internal.project.taskfactory.AnnotationProcessingTaskFactory > $2.execute(AnnotationProcessingTaskFactory.java:127) > 12:55:54.079 [ERROR] [org.gradle.BuildExceptionReporter] at > > org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.executeActions(ExecuteActionsTaskExecuter.java: > 63) > 12:55:54.080 [ERROR] [org.gradle.BuildExceptionReporter] ... 31 more > 12:55:54.080 [ERROR] [org.gradle.BuildExceptionReporter] > 12:55:54.087 [LIFECYCLE] [org.gradle.BuildResultLogger] > 12:55:54.087 [LIFECYCLE] [org.gradle.BuildResultLogger] BUILD FAILED > 12:55:54.088 [LIFECYCLE] [org.gradle.BuildResultLogger] > 12:55:54.088 [LIFECYCLE] [org.gradle.BuildResultLogger] Total time: 1 > mins 45.891 secs > > $ java -version > java version "1.6.0\_20" > OpenJDK Runtime Environment (IcedTea6 1.9.8) (amazon-52.1.9.8.36.amzn1- > x86\_64) > OpenJDK 64-Bit Server VM (build 19.0-b09, mixed mode) > > $ echo $JAVA\_HOME > /usr/lib/jvm/jre > > Any advise much appreciated. ---
**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:** [October 4, 2011, 2:15pm UTC](https://discuss.elastic.co/t/cause-unable-to-find-a-javac-compiler/5512/3 "2011-10-04T14:15:32Z")
> Instead of building it, why not just download an official release? "If you build it, he will come !", Field of Dreams, 1989 > **[Field of Dreams](https://en.wikipedia.org/wiki/Field_of_Dreams)** > > Field of Dreams is a 1989 American sports fantasy drama film written and directed by Phil Alden Robinson, based on Canadian novelist W. P. Kinsella's 1982 novel Shoeless Joe. The film stars Kevin Costner as a farmer who builds a baseball field in his cornfield that attracts the ghosts of baseball legends, including Shoeless Joe Jackson (Ray Liotta) and the Chicago Black Sox. Amy Madigan, James Earl Jones and Burt Lancaster (in his final film role) also star. > The film was released on May 5, 198... David 😉 Le 4 oct. 2011 à 16:05, Shay Banon [kimchy@gmail.com](mailto:kimchy@gmail.com) a écrit : > In order to build elasticsearch, you need the JDK (Java Development Kit), not a JRE (the Java Runtime). Instead of building it, why not just download an official release? > > On Tue, Oct 4, 2011 at 3:14 PM, khinester [norman.khine@gmail.com](mailto:norman.khine@gmail.com) wrote: > Hello, > I have just setup a test AWS server and have cloned elesticsearch. > > $ cd packages > $ git clone git://github.com/elasticsearch/elasticsearch.git && cd > elasticsearch > $ ./gradlew --debug release > > ... > > 12:55:53.968 [DEBUG] > [org.gradle.api.internal.project.ant.AntLoggingAdapter] fileset: Setup > scanner in dir /home/ec2-user/packages/elasticsearch/modules/test/ > testng/src/main/java with patternSet{ includes: excludes: } > 12:55:53.989 [DEBUG] > [org.gradle.api.internal.tasks.execution.ExecuteAtMostOnceTaskExecuter] > Finished executing task ':test-testng:compileJava' > 12:55:54.005 [ERROR] [org.gradle.BuildExceptionReporter] > 12:55:54.007 [ERROR] [org.gradle.BuildExceptionReporter] FAILURE: > Build failed with an exception. > 12:55:54.010 [ERROR] [org.gradle.BuildExceptionReporter] > 12:55:54.010 [ERROR] [org.gradle.BuildExceptionReporter] \* What went > wrong: > 12:55:54.011 [ERROR] [org.gradle.BuildExceptionReporter] Execution > failed for task ':test-testng:compileJava'. > 12:55:54.014 [ERROR] [org.gradle.BuildExceptionReporter] Cause: Unable > to find a javac compiler; > 12:55:54.014 [ERROR] [org.gradle.BuildExceptionReporter] > com.sun.tools.javac.Main is not on the classpath. > 12:55:54.015 [ERROR] [org.gradle.BuildExceptionReporter] Perhaps > JAVA\_HOME does not point to the JDK. > 12:55:54.017 [ERROR] [org.gradle.BuildExceptionReporter] It is > currently set to "/usr/lib/jvm/java-1.6.0-openjdk-1.6.0.0.x86\_64/jre" > 12:55:54.017 [ERROR] [org.gradle.BuildExceptionReporter] > 12:55:54.022 [ERROR] [org.gradle.BuildExceptionReporter] \* Exception > is: > 12:55:54.023 [ERROR] [org.gradle.BuildExceptionReporter] > org.gradle.api.tasks.TaskExecutionException: Execution failed for task > ':test-testng:compileJava'. > 12:55:54.023 [ERROR] [org.gradle.BuildExceptionReporter] at > org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.executeActions(ExecuteActionsTaskExecuter.java: > 71) > 12:55:54.024 [ERROR] [org.gradle.BuildExceptionReporter] at > org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.execute(ExecuteActionsTaskExecuter.java: > 48) > 12:55:54.024 [ERROR] [org.gradle.BuildExceptionReporter] at > org.gradle.api.internal.tasks.execution.PostExecutionAnalysisTaskExecuter.execute(PostExecutionAnalysisTaskExecuter.java: > 34) > 12:55:54.031 [ERROR] [org.gradle.BuildExceptionReporter] at > org.gradle.api.internal.tasks.execution.SkipUpToDateTaskExecuter.execute(SkipUpToDateTaskExecuter.java: > 55) > 12:55:54.032 [ERROR] [org.gradle.BuildExceptionReporter] at > org.gradle.api.internal.tasks.execution.ValidatingTaskExecuter.execute(ValidatingTaskExecuter.java: > 57) > 12:55:54.032 [ERROR] [org.gradle.BuildExceptionReporter] at > org.gradle.api.internal.tasks.execution.SkipEmptySourceFilesTaskExecuter.execute(SkipEmptySourceFilesTaskExecuter.java: > 41) > 12:55:54.032 [ERROR] [org.gradle.BuildExceptionReporter] at > org.gradle.api.internal.tasks.execution.SkipTaskWithNoActionsExecuter.execute(SkipTaskWithNoActionsExecuter.java: > 51) > 12:55:54.033 [ERROR] [org.gradle.BuildExceptionReporter] at > org.gradle.api.internal.tasks.execution.SkipOnlyIfTaskExecuter.execute(SkipOnlyIfTaskExecuter.java: > 52) > 12:55:54.036 [ERROR] [org.gradle.BuildExceptionReporter] at > org.gradle.api.internal.tasks.execution.ExecuteAtMostOnceTaskExecuter.execute(ExecuteAtMostOnceTaskExecuter.java: > 42) > 12:55:54.036 [ERROR] [org.gradle.BuildExceptionReporter] at > org.gradle.api.internal.AbstractTask.execute(AbstractTask.java:237) > 12:55:54.037 [ERROR] [org.gradle.BuildExceptionReporter] at > org.gradle.execution.DefaultTaskGraphExecuter.executeTask(DefaultTaskGraphExecuter.java: > 167) > 12:55:54.037 [ERROR] [org.gradle.BuildExceptionReporter] at > org.gradle.execution.DefaultTaskGraphExecuter.doExecute(DefaultTaskGraphExecuter.java: > 160) > 12:55:54.040 [ERROR] [org.gradle.BuildExceptionReporter] at > org.gradle.execution.DefaultTaskGraphExecuter.execute(DefaultTaskGraphExecuter.java: > 78) > 12:55:54.040 [ERROR] [org.gradle.BuildExceptionReporter] at > org.gradle.execution.TaskNameResolvingBuildExecuter.execute(TaskNameResolvingBuildExecuter.java: > 113) > 12:55:54.041 [ERROR] [org.gradle.BuildExceptionReporter] at > org.gradle.execution.DelegatingBuildExecuter.execute(DelegatingBuildExecuter.java: > 54) > 12:55:54.041 [ERROR] [org.gradle.BuildExceptionReporter] at > org.gradle.initialization.DefaultGradleLauncher.doBuildStages(DefaultGradleLauncher.java: > 158) > 12:55:54.042 [ERROR] [org.gradle.BuildExceptionReporter] at > org.gradle.initialization.DefaultGradleLauncher.doBuild(DefaultGradleLauncher.java: > 112) > 12:55:54.042 [ERROR] [org.gradle.BuildExceptionReporter] at > org.gradle.initialization.DefaultGradleLauncher.run(DefaultGradleLauncher.java: > 80) > 12:55:54.045 [ERROR] [org.gradle.BuildExceptionReporter] at > org.gradle.launcher.RunBuildAction.execute(RunBuildAction.java:41) > 12:55:54.045 [ERROR] [org.gradle.BuildExceptionReporter] at > org.gradle.launcher.RunBuildAction.execute(RunBuildAction.java:27) > 12:55:54.046 [ERROR] [org.gradle.BuildExceptionReporter] at > org.gradle.launcher.ExceptionReportingAction.execute(ExceptionReportingAction.java: > 32) > 12:55:54.046 [ERROR] [org.gradle.BuildExceptionReporter] at > org.gradle.launcher.ExceptionReportingAction.execute(ExceptionReportingAction.java: > 21) > 12:55:54.049 [ERROR] [org.gradle.BuildExceptionReporter] at > org.gradle.launcher.CommandLineActionFactory > $WithLoggingAction.execute(CommandLineActionFactory.java:219) > 12:55:54.050 [ERROR] [org.gradle.BuildExceptionReporter] at > org.gradle.launcher.CommandLineActionFactory > $WithLoggingAction.execute(CommandLineActionFactory.java:203) > 12:55:54.050 [ERROR] [org.gradle.BuildExceptionReporter] at > org.gradle.launcher.Main.execute(Main.java:55) > 12:55:54.051 [ERROR] [org.gradle.BuildExceptionReporter] at > org.gradle.launcher.Main.main(Main.java:40) > 12:55:54.051 [ERROR] [org.gradle.BuildExceptionReporter] at > org.gradle.launcher.ProcessBootstrap.runNoExit(ProcessBootstrap.java: > 46) > 12:55:54.051 [ERROR] [org.gradle.BuildExceptionReporter] at > org.gradle.launcher.ProcessBootstrap.run(ProcessBootstrap.java:28) > 12:55:54.052 [ERROR] [org.gradle.BuildExceptionReporter] at > org.gradle.launcher.GradleMain.main(GradleMain.java:24) > 12:55:54.052 [ERROR] [org.gradle.BuildExceptionReporter] at > org.gradle.wrapper.BootstrapMainStarter.start(BootstrapMainStarter.java: > 33) > 12:55:54.058 [ERROR] [org.gradle.BuildExceptionReporter] at > org.gradle.wrapper.Wrapper.execute(Wrapper.java:87) > 12:55:54.059 [ERROR] [org.gradle.BuildExceptionReporter] at > org.gradle.wrapper.GradleWrapperMain.main(GradleWrapperMain.java:37) > 12:55:54.059 [ERROR] [org.gradle.BuildExceptionReporter] Caused by: : > Unable to find a javac compiler; > 12:55:54.059 [ERROR] [org.gradle.BuildExceptionReporter] > com.sun.tools.javac.Main is not on the classpath. > 12:55:54.060 [ERROR] [org.gradle.BuildExceptionReporter] Perhaps > JAVA\_HOME does not point to the JDK. > 12:55:54.060 [ERROR] [org.gradle.BuildExceptionReporter] It is > currently set to "/usr/lib/jvm/java-1.6.0-openjdk-1.6.0.0.x86\_64/jre" > 12:55:54.060 [ERROR] [org.gradle.BuildExceptionReporter] at > org.apache.tools.ant.taskdefs.compilers.CompilerAdapterFactory.getCompiler(CompilerAdapterFactory.java: > 128) > 12:55:54.061 [ERROR] [org.gradle.BuildExceptionReporter] at > org.apache.tools.ant.taskdefs.Javac.findSupportedFileExtensions(Javac.java: > 961) > 12:55:54.061 [ERROR] [org.gradle.BuildExceptionReporter] at > org.apache.tools.ant.taskdefs.Javac.scanDir(Javac.java:938) > 12:55:54.067 [ERROR] [org.gradle.BuildExceptionReporter] at > org.apache.tools.ant.taskdefs.Javac.execute(Javac.java:909) > 12:55:54.068 [ERROR] [org.gradle.BuildExceptionReporter] at > org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:291) > 12:55:54.068 [ERROR] [org.gradle.BuildExceptionReporter] at > org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java: > 106) > 12:55:54.069 [ERROR] [org.gradle.BuildExceptionReporter] at > org.gradle.api.internal.project.ant.BasicAntBuilder.nodeCompleted(BasicAntBuilder.java: > 71) > 12:55:54.069 [ERROR] [org.gradle.BuildExceptionReporter] at > org.gradle.api.internal.project.ant.BasicAntBuilder.doInvokeMethod(BasicAntBuilder.java: > 86) > 12:55:54.069 [ERROR] [org.gradle.BuildExceptionReporter] at > org.gradle.api.internal.project.DefaultAntBuilder.super > $3$invokeMethod(DefaultAntBuilder.groovy) > 12:55:54.070 [ERROR] [org.gradle.BuildExceptionReporter] at > org.gradle.api.internal.project.DefaultAntBuilder.invokeMethod(DefaultAntBuilder.groovy: > 37) > 12:55:54.070 [ERROR] [org.gradle.BuildExceptionReporter] at > org.gradle.api.internal.tasks.compile.AntJavaCompiler.execute(AntJavaCompiler.groovy: > 64) > 12:55:54.070 [ERROR] [org.gradle.BuildExceptionReporter] at > org.gradle.api.internal.tasks.compile.IncrementalJavaSourceCompiler.execute(IncrementalJavaSourceCompiler.java: > 73) > 12:55:54.071 [ERROR] [org.gradle.BuildExceptionReporter] at > org.gradle.api.tasks.compile.Compile.compile(Compile.java:55) > 12:55:54.071 [ERROR] [org.gradle.BuildExceptionReporter] at > org.gradle.api.internal.BeanDynamicObject.invokeMethod(BeanDynamicObject.java: > 158) > 12:55:54.077 [ERROR] [org.gradle.BuildExceptionReporter] at > org.gradle.api.internal.CompositeDynamicObject.invokeMethod(CompositeDynamicObject.java: > 93) > 12:55:54.078 [ERROR] [org.gradle.BuildExceptionReporter] at > org.gradle.api.tasks.compile.Compile\_Decorated.invokeMethod(Unknown > Source) > 12:55:54.078 [ERROR] [org.gradle.BuildExceptionReporter] at > org.gradle.util.ReflectionUtil.invoke(ReflectionUtil.groovy:23) > 12:55:54.079 [ERROR] [org.gradle.BuildExceptionReporter] at > org.gradle.api.internal.project.taskfactory.AnnotationProcessingTaskFactory > $2.execute(AnnotationProcessingTaskFactory.java:129) > 12:55:54.079 [ERROR] [org.gradle.BuildExceptionReporter] at > org.gradle.api.internal.project.taskfactory.AnnotationProcessingTaskFactory > $2.execute(AnnotationProcessingTaskFactory.java:127) > 12:55:54.079 [ERROR] [org.gradle.BuildExceptionReporter] at > org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.executeActions(ExecuteActionsTaskExecuter.java: > 63) > 12:55:54.080 [ERROR] [org.gradle.BuildExceptionReporter] ... 31 more > 12:55:54.080 [ERROR] [org.gradle.BuildExceptionReporter] > 12:55:54.087 [LIFECYCLE] [org.gradle.BuildResultLogger] > 12:55:54.087 [LIFECYCLE] [org.gradle.BuildResultLogger] BUILD FAILED > 12:55:54.088 [LIFECYCLE] [org.gradle.BuildResultLogger] > 12:55:54.088 [LIFECYCLE] [org.gradle.BuildResultLogger] Total time: 1 > mins 45.891 secs > > $ java -version > java version "1.6.0\_20" > OpenJDK Runtime Environment (IcedTea6 1.9.8) (amazon-52.1.9.8.36.amzn1- > x86\_64) > OpenJDK 64-Bit Server VM (build 19.0-b09, mixed mode) > > $ echo $JAVA\_HOME > /usr/lib/jvm/jre > > Any advise much appreciated. ---
**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\ **Post date:** [July 6, 2017, 3:52am UTC](https://discuss.elastic.co/t/cause-unable-to-find-a-javac-compiler/5512/4 "2017-07-06T03:52:51Z")