```./buckw install -r pos-app
Parsing buck files: finished in 0.9 sec
Building... 5.4 sec (98%) 2044/2079 jobs, 0 updated
 - IDLE
 - //.okbuck/ext/org/eclipse/jetty:jetty-server-9.4.14.v20181114.jar#d8... 3.2 sec (running d8[3.2 sec])
 - //.okbuck/ext/org/hibernate/validator:hibernate-validator-6.0.13.Final.jar#d8... 3.5 sec (running d8[3.5 sec])
 - //.okbuck/ext/org/apache/logging/log4j:log4j-core-2.11.1.jar#d8... 3.5 sec (running d8[3.5 sec])
 - //hairball-features/help:src_debug... 3.3 sec (running kotlinc[1.3 sec])
 - //hairball-features/items-applet:src_debug... 3.4 sec (running kotlinc[2.2 sec])
 - //.okbuck/ext/org/apache/kafka:kafka-clients-0.11.0.1.jar#d8... 3.3 sec (running d8[3.3 sec])
 - IDLE
Error: MethodHandle.invoke and MethodHandle.invokeExact are only supported starting with Android O (--min-api 26)
com.android.tools.r8.CompilationFailedException: Compilation failed to complete
	at com.android.tools.r8.utils.ExceptionUtils.withCompilationHandler(ExceptionUtils.java:72)
	at com.android.tools.r8.utils.ExceptionUtils.withD8CompilationHandler(ExceptionUtils.java:43)
	at com.android.tools.r8.D8.run(D8.java:73)
	at com.facebook.buck.android.DxStep.executeInProcess(DxStep.java:306)
	at com.facebook.buck.android.DxStep.execute(DxStep.java:268)
	at com.facebook.buck.step.DefaultStepRunner.runStepForBuildTarget(DefaultStepRunner.java:45)
	at com.facebook.buck.core.build.engine.impl.CachingBuildRuleBuilder$BuildRuleSteps.executeCommands(CachingBuildRuleBuilder.java:1362)
	at com.facebook.buck.core.build.engine.impl.CachingBuildRuleBuilder$BuildRuleSteps.executeCommandsNowThatDepsAreBuilt(CachingBuildRuleBuilder.java:1330)
	at com.facebook.buck.core.build.engine.impl.CachingBuildRuleBuilder$BuildRuleSteps.runWithExecutor(CachingBuildRuleBuilder.java:1289)
	at com.facebook.buck.core.build.engine.impl.CachingBuildRuleBuilder$BuildRuleSteps.run(CachingBuildRuleBuilder.java:1278)
	at com.facebook.buck.core.build.engine.impl.CachingBuildRuleBuilder$2.runWithDefaultExecutor(CachingBuildRuleBuilder.java:811)
	at com.facebook.buck.util.concurrent.WeightedListeningExecutorService.lambda$submit$2(WeightedListeningExecutorService.java:100)
	at com.facebook.buck.util.concurrent.WeightedListeningExecutorService.lambda$submitWithSemaphore$0(WeightedListeningExecutorService.java:74)
	at com.google.common.util.concurrent.AbstractTransformFuture$AsyncTransformFuture.doTransform(AbstractTransformFuture.java:206)
	at com.google.common.util.concurrent.AbstractTransformFuture$AsyncTransformFuture.doTransform(AbstractTransformFuture.java:195)
	at com.google.common.util.concurrent.AbstractTransformFuture.run(AbstractTransformFuture.java:115)
	at com.google.common.util.concurrent.MoreExecutors$5$1.run(MoreExecutors.java:999)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
	at java.lang.Thread.run(Thread.java:748)
Caused by: com.android.tools.r8.utils.AbortException: Error: MethodHandle.invoke and MethodHandle.invokeExact are only supported starting with Android O (--min-api 26)
	at com.android.tools.r8.utils.Reporter.failIfPendingErrors(Reporter.java:101)
	at com.android.tools.r8.utils.Reporter.fatalError(Reporter.java:72)
	at com.android.tools.r8.utils.ExceptionUtils.withCompilationHandler(ExceptionUtils.java:64)
	... 19 more
Error: Class or interface javax.servlet.ServletException required for desugaring of try-with-resources is not found.
com.android.tools.r8.CompilationFailedException: Compilation failed to complete
	at com.android.tools.r8.utils.ExceptionUtils.withCompilationHandler(ExceptionUtils.java:72)
	at com.android.tools.r8.utils.ExceptionUtils.withD8CompilationHandler(ExceptionUtils.java:43)
	at com.android.tools.r8.D8.run(D8.java:73)
	at com.facebook.buck.android.DxStep.executeInProcess(DxStep.java:306)
	at com.facebook.buck.android.DxStep.execute(DxStep.java:268)
	at com.facebook.buck.step.DefaultStepRunner.runStepForBuildTarget(DefaultStepRunner.java:45)
	at com.facebook.buck.core.build.engine.impl.CachingBuildRuleBuilder$BuildRuleSteps.executeCommands(CachingBuildRuleBuilder.java:1362)
	at com.facebook.buck.core.build.engine.impl.CachingBuildRuleBuilder$BuildRuleSteps.executeCommandsNowThatDepsAreBuilt(CachingBuildRuleBuilder.java:1330)
	at com.facebook.buck.core.build.engine.impl.CachingBuildRuleBuilder$BuildRuleSteps.runWithExecutor(CachingBuildRuleBuilder.java:1289)
	at com.facebook.buck.core.build.engine.impl.CachingBuildRuleBuilder$BuildRuleSteps.run(CachingBuildRuleBuilder.java:1278)
	at com.facebook.buck.core.build.engine.impl.CachingBuildRuleBuilder$2.runWithDefaultExecutor(CachingBuildRuleBuilder.java:811)
	at com.facebook.buck.util.concurrent.WeightedListeningExecutorService.lambda$submit$2(WeightedListeningExecutorService.java:100)
	at com.facebook.buck.util.concurrent.WeightedListeningExecutorService.lambda$submitWithSemaphore$0(WeightedListeningExecutorService.java:74)
	at com.google.common.util.concurrent.AbstractTransformFuture$AsyncTransformFuture.doTransform(AbstractTransformFuture.java:206)
	at com.google.common.util.concurrent.AbstractTransformFuture$AsyncTransformFuture.doTransform(AbstractTransformFuture.java:195)
	at com.google.common.util.concurrent.AbstractTransformFuture.run(AbstractTransformFuture.java:115)
	at com.google.common.util.concurrent.MoreExecutors$5$1.run(MoreExecutors.java:999)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
	at java.lang.Thread.run(Thread.java:748)
Caused by: com.android.tools.r8.utils.AbortException: Error: Class or interface javax.servlet.ServletException required for desugaring of try-with-resources is not found.
	at com.android.tools.r8.utils.Reporter.failIfPendingErrors(Reporter.java:101)
	at com.android.tools.r8.utils.Reporter.fatalError(Reporter.java:72)
	at com.android.tools.r8.utils.ExceptionUtils.withCompilationHandler(ExceptionUtils.java:64)
	... 19 more
Error: MethodHandle.invoke and MethodHandle.invokeExact are only supported starting with Android O (--min-api 26)
com.android.tools.r8.CompilationFailedException: Compilation failed to complete
	at com.android.tools.r8.utils.ExceptionUtils.withCompilationHandler(ExceptionUtils.java:72)
	at com.android.tools.r8.utils.ExceptionUtils.withD8CompilationHandler(ExceptionUtils.java:43)
	at com.android.tools.r8.D8.run(D8.java:73)
	at com.facebook.buck.android.DxStep.executeInProcess(DxStep.java:306)
	at com.facebook.buck.android.DxStep.execute(DxStep.java:268)
	at com.facebook.buck.step.DefaultStepRunner.runStepForBuildTarget(DefaultStepRunner.java:45)
	at com.facebook.buck.core.build.engine.impl.CachingBuildRuleBuilder$BuildRuleSteps.executeCommands(CachingBuildRuleBuilder.java:1362)
	at com.facebook.buck.core.build.engine.impl.CachingBuildRuleBuilder$BuildRuleSteps.executeCommandsNowThatDepsAreBuilt(CachingBuildRuleBuilder.java:1330)
	at com.facebook.buck.core.build.engine.impl.CachingBuildRuleBuilder$BuildRuleSteps.runWithExecutor(CachingBuildRuleBuilder.java:1289)
	at com.facebook.buck.core.build.engine.impl.CachingBuildRuleBuilder$BuildRuleSteps.run(CachingBuildRuleBuilder.java:1278)
	at com.facebook.buck.core.build.engine.impl.CachingBuildRuleBuilder$2.runWithDefaultExecutor(CachingBuildRuleBuilder.java:811)
	at com.facebook.buck.util.concurrent.WeightedListeningExecutorService.lambda$submit$2(WeightedListeningExecutorService.java:100)
	at com.facebook.buck.util.concurrent.WeightedListeningExecutorService.lambda$submitWithSemaphore$0(WeightedListeningExecutorService.java:74)
	at com.google.common.util.concurrent.AbstractTransformFuture$AsyncTransformFuture.doTransform(AbstractTransformFuture.java:206)
	at com.google.common.util.concurrent.AbstractTransformFuture$AsyncTransformFuture.doTransform(AbstractTransformFuture.java:195)
	at com.google.common.util.concurrent.AbstractTransformFuture.run(AbstractTransformFuture.java:115)
	at com.google.common.util.concurrent.MoreExecutors$5$1.run(MoreExecutors.java:999)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
	at java.lang.Thread.run(Thread.java:748)
Caused by: com.android.tools.r8.utils.AbortException: Error: MethodHandle.invoke and MethodHandle.invokeExact are only supported starting with Android O (--min-api 26)
	at com.android.tools.r8.utils.Reporter.failIfPendingErrors(Reporter.java:101)
	at com.android.tools.r8.utils.Reporter.fatalError(Reporter.java:72)
	at com.android.tools.r8.utils.ExceptionUtils.withCompilationHandler(ExceptionUtils.java:64)
	... 19 more
Error: MethodHandle.invoke and MethodHandle.invokeExact are only supported starting with Android O (--min-api 26)
com.android.tools.r8.CompilationFailedException: Compilation failed to complete
	at com.android.tools.r8.utils.ExceptionUtils.withCompilationHandler(ExceptionUtils.java:72)
	at com.android.tools.r8.utils.ExceptionUtils.withD8CompilationHandler(ExceptionUtils.java:43)
	at com.android.tools.r8.D8.run(D8.java:73)
	at com.facebook.buck.android.DxStep.executeInProcess(DxStep.java:306)
	at com.facebook.buck.android.DxStep.execute(DxStep.java:268)
	at com.facebook.buck.step.DefaultStepRunner.runStepForBuildTarget(DefaultStepRunner.java:45)
	at com.facebook.buck.core.build.engine.impl.CachingBuildRuleBuilder$BuildRuleSteps.executeCommands(CachingBuildRuleBuilder.java:1362)
	at com.facebook.buck.core.build.engine.impl.CachingBuildRuleBuilder$BuildRuleSteps.executeCommandsNowThatDepsAreBuilt(CachingBuildRuleBuilder.java:1330)
	at com.facebook.buck.core.build.engine.impl.CachingBuildRuleBuilder$BuildRuleSteps.runWithExecutor(CachingBuildRuleBuilder.java:1289)
	at com.facebook.buck.core.build.engine.impl.CachingBuildRuleBuilder$BuildRuleSteps.run(CachingBuildRuleBuilder.java:1278)
	at com.facebook.buck.core.build.engine.impl.CachingBuildRuleBuilder$2.runWithDefaultExecutor(CachingBuildRuleBuilder.java:811)
	at com.facebook.buck.util.concurrent.WeightedListeningExecutorService.lambda$submit$2(WeightedListeningExecutorService.java:100)
	at com.facebook.buck.util.concurrent.WeightedListeningExecutorService.lambda$submitWithSemaphore$0(WeightedListeningExecutorService.java:74)
	at com.google.common.util.concurrent.AbstractTransformFuture$AsyncTransformFuture.doTransform(AbstractTransformFuture.java:206)
	at com.google.common.util.concurrent.AbstractTransformFuture$AsyncTransformFuture.doTransform(AbstractTransformFuture.java:195)
	at com.google.common.util.concurrent.AbstractTransformFuture.run(AbstractTransformFuture.java:115)
	at com.google.common.util.concurrent.MoreExecutors$5$1.run(MoreExecutors.java:999)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
	at java.lang.Thread.run(Thread.java:748)
Caused by: com.android.tools.r8.utils.AbortException: Error: MethodHandle.invoke and MethodHandle.invokeExact are only supported starting with Android O (--min-api 26)
	at com.android.tools.r8.utils.Reporter.failIfPendingErrors(Reporter.java:101)
	at com.android.tools.r8.utils.Reporter.fatalError(Reporter.java:72)
	at com.android.tools.r8.utils.ExceptionUtils.withCompilationHandler(ExceptionUtils.java:64)
	... 19 more```