java.util.EmptyStackException throws from imported ANT tasks

river · July 26, 2016, 5:47pm

Gradle Version: 2.14.1
Operating System: Windows 7(64bit)
Is this a regression? If yes, which version of Gradle do you know it last worked for?

We have experienced an EmptyStackException thrown from an imported ANT target and successfully captured the issue into a minimal build script:

build.gradle:

ant.importBuild 'build.xml'

build.xml:

<?xml version="1.0" encoding="utf-8"?>
<project name="Test" default="build" >
	<target name="build" depends="x, a, b, c, d, e"/>
	<target name="a"/>
	<target name="b" />
	<target name="c" />
	<target name="e"/>
	<target name="x" depends="e"/>
	<target name="d" depends="f"/>
	<target name="f" depends="x"/>
</project>

Console output:

gradle build --stacktrace

FAILURE: Build failed with an exception.

* What went wrong:
java.util.EmptyStackException (no error message)

* Try:
Run with --info or --debug option to get more log output.

* Exception is:
java.util.EmptyStackException
        at org.gradle.execution.taskgraph.DefaultTaskExecutionPlan.restorePath(DefaultTaskExecutionPlan.java:343)
        at org.gradle.execution.taskgraph.DefaultTaskExecutionPlan.determineExecutionPlan(DefaultTaskExecutionPlan.java:281)
        at org.gradle.execution.taskgraph.DefaultTaskGraphExecuter.ensurePopulated(DefaultTaskGraphExecuter.java:172)
        at org.gradle.execution.taskgraph.DefaultTaskGraphExecuter.execute(DefaultTaskGraphExecuter.java:106)
        at org.gradle.execution.SelectedTaskExecutionAction.execute(SelectedTaskExecutionAction.java:37)
        at org.gradle.execution.DefaultBuildExecuter.execute(DefaultBuildExecuter.java:37)
        at org.gradle.execution.DefaultBuildExecuter.access$000(DefaultBuildExecuter.java:23)
        at org.gradle.execution.DefaultBuildExecuter$1.proceed(DefaultBuildExecuter.java:43)
        at org.gradle.execution.DryRunBuildExecutionAction.execute(DryRunBuildExecutionAction.java:32)
        at org.gradle.execution.DefaultBuildExecuter.execute(DefaultBuildExecuter.java:37)
        at org.gradle.execution.DefaultBuildExecuter.execute(DefaultBuildExecuter.java:30)
        at org.gradle.initialization.DefaultGradleLauncher$4.run(DefaultGradleLauncher.java:154)
        at org.gradle.internal.Factories$1.create(Factories.java:22)
        at org.gradle.internal.progress.DefaultBuildOperationExecutor.run(DefaultBuildOperationExecutor.java:90)
        at org.gradle.internal.progress.DefaultBuildOperationExecutor.run(DefaultBuildOperationExecutor.java:52)
        at org.gradle.initialization.DefaultGradleLauncher.doBuildStages(DefaultGradleLauncher.java:151)
        at org.gradle.initialization.DefaultGradleLauncher.access$200(DefaultGradleLauncher.java:32)
        at org.gradle.initialization.DefaultGradleLauncher$1.create(DefaultGradleLauncher.java:99)
        at org.gradle.initialization.DefaultGradleLauncher$1.create(DefaultGradleLauncher.java:93)
        at org.gradle.internal.progress.DefaultBuildOperationExecutor.run(DefaultBuildOperationExecutor.java:90)
        at org.gradle.internal.progress.DefaultBuildOperationExecutor.run(DefaultBuildOperationExecutor.java:62)
        at org.gradle.initialization.DefaultGradleLauncher.doBuild(DefaultGradleLauncher.java:93)
        at org.gradle.initialization.DefaultGradleLauncher.run(DefaultGradleLauncher.java:82)
        at org.gradle.launcher.exec.InProcessBuildActionExecuter$DefaultBuildController.run(InProcessBuildActionExecuter.java:94)
        at org.gradle.tooling.internal.provider.ExecuteBuildActionRunner.run(ExecuteBuildActionRunner.java:28)
        at org.gradle.launcher.exec.ChainingBuildActionRunner.run(ChainingBuildActionRunner.java:35)
        at org.gradle.launcher.exec.InProcessBuildActionExecuter.execute(InProcessBuildActionExecuter.java:43)
        at org.gradle.launcher.exec.InProcessBuildActionExecuter.execute(InProcessBuildActionExecuter.java:28)
        at org.gradle.launcher.exec.ContinuousBuildActionExecuter.execute(ContinuousBuildActionExecuter.java:75)
        at org.gradle.launcher.exec.ContinuousBuildActionExecuter.execute(ContinuousBuildActionExecuter.java:45)
        at org.gradle.launcher.exec.DaemonUsageSuggestingBuildActionExecuter.execute(DaemonUsageSuggestingBuildActionExecuter.java
        at org.gradle.launcher.exec.DaemonUsageSuggestingBuildActionExecuter.execute(DaemonUsageSuggestingBuildActionExecuter.java
        at org.gradle.launcher.cli.RunBuildAction.run(RunBuildAction.java:43)
        at org.gradle.internal.Actions$RunnableActionAdapter.execute(Actions.java:170)
        at org.gradle.launcher.cli.CommandLineActionFactory$ParseAndBuildAction.execute(CommandLineActionFactory.java:237)
        at org.gradle.launcher.cli.CommandLineActionFactory$ParseAndBuildAction.execute(CommandLineActionFactory.java:210)
        at org.gradle.launcher.cli.JavaRuntimeValidationAction.execute(JavaRuntimeValidationAction.java:35)
        at org.gradle.launcher.cli.JavaRuntimeValidationAction.execute(JavaRuntimeValidationAction.java:24)
        at org.gradle.launcher.cli.CommandLineActionFactory$WithLogging.execute(CommandLineActionFactory.java:206)
        at org.gradle.launcher.cli.CommandLineActionFactory$WithLogging.execute(CommandLineActionFactory.java:169)
        at org.gradle.launcher.cli.ExceptionReportingAction.execute(ExceptionReportingAction.java:33)
        at org.gradle.launcher.cli.ExceptionReportingAction.execute(ExceptionReportingAction.java:22)
        at org.gradle.launcher.Main.doAction(Main.java:33)
        at org.gradle.launcher.bootstrap.EntryPoint.run(EntryPoint.java:45)
        at org.gradle.launcher.bootstrap.ProcessBootstrap.runNoExit(ProcessBootstrap.java:54)
        at org.gradle.launcher.bootstrap.ProcessBootstrap.run(ProcessBootstrap.java:35)
        at org.gradle.launcher.GradleMain.main(GradleMain.java:23)


BUILD FAILED

Total time: 2.002 secs

Extra notes:

The exception will not throw if task ‘a’, ‘b’ or ‘c’ are removed from the dependency list of ‘build’ task.

Stefan_Wolf · August 1, 2016, 12:34pm

Hi,

thank you for reporting this. I can reproduce the bug locally. It seems to be fixed by changing the build target to ```


It looks that it is related to [GRADLE-3127](https://issues.gradle.org/browse/GRADLE-3127). This affects also older Gradle versions and is no a regression in 2.14. I will look into it and try to provide a fix later that week.

Stefan_Wolf · August 2, 2016, 9:27am

It looks like GRADLE-3127 hasn’t been solved completely with Gradle 2.2. We fixed this problem in the current master branch. The fix will be included in Gradle 3.1-rc-1.

river · August 3, 2016, 1:46pm

When will 3.1-rc-1 available to be fetched by gradlew wrapper? And will the fix also be backported to gradle 2 branch?

Stefan_Wolf · August 3, 2016, 3:01pm

Currently there are no plans on backporting this to Gradle 2. If you want to try out the fix you can use the latest nightly:

gradle wrapper --gradle-version 3.1-20160803000014+0000

How to use the nightly is also described here: https://gradle.org/gradle-nightly-build/

I suppose Gradle 3.1 will be released end of September, so you can expect a first RC shortly before that.