Java 1.8 Gradle problem

[zhangysh1995]

gradle jar in directory throws:

FAILURE: Build failed with an exception.

* Where:
Build file '/Users/KellyZhang/Desktop/work/Software/LewisOmniscientDebugger-0.1.5/build.gradle' line: 73

* What went wrong:
Execution failed for task ':jar'.
> You cannot add child specs at execution time. Consider configuring this task during configuration time or using a separate task to do the configuration.

I'm not familiar with Gradle, but sovled this way

My java version:

java version "1.8.0_45"
Java(TM) SE Runtime Environment (build 1.8.0_45-b14)
Java HotSpot(TM) 64-Bit Server VM (build 25.45-b02, mixed mode)

And I use the release for building.

Exception stack trace below:

org.gradle.api.tasks.TaskExecutionException: Execution failed for task ':jar'. at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.executeActions(ExecuteActionsTaskExecuter.java:100) at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.execute(ExecuteActionsTaskExecuter.java:70) at org.gradle.api.internal.tasks.execution.SkipUpToDateTaskExecuter.execute(SkipUpToDateTaskExecuter.java:62) at org.gradle.api.internal.tasks.execution.ResolveTaskOutputCachingStateExecuter.execute(ResolveTaskOutputCachingStateExecuter.java:54) at org.gradle.api.internal.tasks.execution.ValidatingTaskExecuter.execute(ValidatingTaskExecuter.java:58) at org.gradle.api.internal.tasks.execution.SkipEmptySourceFilesTaskExecuter.execute(SkipEmptySourceFilesTaskExecuter.java:97) at org.gradle.api.internal.tasks.execution.CleanupStaleOutputsExecuter.execute(CleanupStaleOutputsExecuter.java:87) at org.gradle.api.internal.tasks.execution.ResolveTaskArtifactStateTaskExecuter.execute(ResolveTaskArtifactStateTaskExecuter.java:52) at org.gradle.api.internal.tasks.execution.SkipTaskWithNoActionsExecuter.execute(SkipTaskWithNoActionsExecuter.java:52) at org.gradle.api.internal.tasks.execution.SkipOnlyIfTaskExecuter.execute(SkipOnlyIfTaskExecuter.java:54) at org.gradle.api.internal.tasks.execution.ExecuteAtMostOnceTaskExecuter.execute(ExecuteAtMostOnceTaskExecuter.java:43) at org.gradle.api.internal.tasks.execution.CatchExceptionTaskExecuter.execute(CatchExceptionTaskExecuter.java:34) at org.gradle.execution.taskgraph.DefaultTaskGraphExecuter$EventFiringTaskWorker$1.run(DefaultTaskGraphExecuter.java:248) at org.gradle.internal.progress.DefaultBuildOperationExecutor$RunnableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:336) at org.gradle.internal.progress.DefaultBuildOperationExecutor$RunnableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:328) at org.gradle.internal.progress.DefaultBuildOperationExecutor.execute(DefaultBuildOperationExecutor.java:199) at org.gradle.internal.progress.DefaultBuildOperationExecutor.run(DefaultBuildOperationExecutor.java:110) at org.gradle.execution.taskgraph.DefaultTaskGraphExecuter$EventFiringTaskWorker.execute(DefaultTaskGraphExecuter.java:241) at org.gradle.execution.taskgraph.DefaultTaskGraphExecuter$EventFiringTaskWorker.execute(DefaultTaskGraphExecuter.java:230) at org.gradle.execution.taskgraph.DefaultTaskPlanExecutor$TaskExecutorWorker.processTask(DefaultTaskPlanExecutor.java:123) at org.gradle.execution.taskgraph.DefaultTaskPlanExecutor$TaskExecutorWorker.access$200(DefaultTaskPlanExecutor.java:79) at org.gradle.execution.taskgraph.DefaultTaskPlanExecutor$TaskExecutorWorker$1.execute(DefaultTaskPlanExecutor.java:104) at org.gradle.execution.taskgraph.DefaultTaskPlanExecutor$TaskExecutorWorker$1.execute(DefaultTaskPlanExecutor.java:98) at org.gradle.execution.taskgraph.DefaultTaskExecutionPlan.execute(DefaultTaskExecutionPlan.java:625) at org.gradle.execution.taskgraph.DefaultTaskExecutionPlan.executeWithTask(DefaultTaskExecutionPlan.java:580) at org.gradle.execution.taskgraph.DefaultTaskPlanExecutor$TaskExecutorWorker.run(DefaultTaskPlanExecutor.java:98) at org.gradle.internal.concurrent.ExecutorPolicy$CatchAndRecordFailures.onExecute(ExecutorPolicy.java:63) at org.gradle.internal.concurrent.ManagedExecutorImpl$1.run(ManagedExecutorImpl.java:46) at org.gradle.internal.concurrent.ThreadFactoryImpl$ManagedThreadRunnable.run(ThreadFactoryImpl.java:55) Caused by: org.gradle.api.GradleException: You cannot add child specs at execution time. Consider configuring this task during configuration time or using a separate task to do the configuration. at org.gradle.api.tasks.AbstractCopyTask$1.childSpecAdded(AbstractCopyTask.java:66) at org.gradle.api.internal.file.copy.DefaultCopySpec.fireChildSpecListeners(DefaultCopySpec.java:191) at org.gradle.api.internal.file.copy.DefaultCopySpec.access$000(DefaultCopySpec.java:55) at org.gradle.api.internal.file.copy.DefaultCopySpec$1.childSpecAdded(DefaultCopySpec.java:176) at org.gradle.api.internal.file.copy.DefaultCopySpec.fireChildSpecListeners(DefaultCopySpec.java:191) at org.gradle.api.internal.file.copy.DefaultCopySpec.access$000(DefaultCopySpec.java:55) at org.gradle.api.internal.file.copy.DefaultCopySpec$2.visit(DefaultCopySpec.java:184) at org.gradle.api.internal.file.copy.DefaultCopySpec.visit(DefaultCopySpec.java:197) at org.gradle.api.internal.file.copy.DefaultCopySpec.addChildSpec(DefaultCopySpec.java:181) at org.gradle.api.internal.file.copy.DefaultCopySpec.addChildSpec(DefaultCopySpec.java:161) at org.gradle.api.internal.file.copy.SingleParentCopySpec.addChild(SingleParentCopySpec.java:33) at org.gradle.api.internal.file.copy.DefaultCopySpec.from(DefaultCopySpec.java:131) at org.gradle.api.tasks.AbstractCopyTask.from(AbstractCopyTask.java:297) at org.gradle.api.tasks.AbstractCopyTask.from(AbstractCopyTask.java:55) at build_cbdh6zlwixgbfc59zr2uky5av$_run_closure6$_closure21.doCall(/Users/KellyZhang/Desktop/work/Software/LewisOmniscientDebugger-0.1.5/build.gradle:73) at org.gradle.api.internal.AbstractTask$ClosureTaskAction.execute(AbstractTask.java:700) at org.gradle.api.internal.AbstractTask$ClosureTaskAction.execute(AbstractTask.java:673) at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter$1.run(ExecuteActionsTaskExecuter.java:121) at org.gradle.internal.progress.DefaultBuildOperationExecutor$RunnableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:336) at org.gradle.internal.progress.DefaultBuildOperationExecutor$RunnableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:328) at org.gradle.internal.progress.DefaultBuildOperationExecutor.execute(DefaultBuildOperationExecutor.java:199) at org.gradle.internal.progress.DefaultBuildOperationExecutor.run(DefaultBuildOperationExecutor.java:110) at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.executeAction(ExecuteActionsTaskExecuter.java:110) at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.executeActions(ExecuteActionsTaskExecuter.java:92) ... 28 more