How to run mvn command from gradle task?

Question

I have a project with following structure:

maven-as-submodule - is just a gradle project; graph-gen - is a maven-module inside a gradle project (not a submodule)

Well, my goal is to run command: mvn graphwalker:generate-sources From a gradle task. So I've composed some:

task generateGraphBasedInterfaces(type: Exec) {
    workingDir './graph-gen'
    commandLine 'mvn graphwalker:generate-sources'
}

Everything seems okay, and I could run command mvn graphwalker:generate-sources without a problem from /graph-gen directory.

But when I'm trying to run it via gradle task - it ends up with error. So, here is some stacktrace:

• Exception is: org.gradle.api.tasks.TaskExecutionException: Execution failed for task ':generateGraphBasedInterfaces'. at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.lambda$executeIfValid$1(ExecuteActionsTaskExecuter.java:187) at org.gradle.internal.Try$Failure.ifSuccessfulOrElse(Try.java:263) at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.executeIfValid(ExecuteActionsTaskExecuter.java:185) at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.execute(ExecuteActionsTaskExecuter.java:166) at org.gradle.api.internal.tasks.execution.CleanupStaleOutputsExecuter.execute(CleanupStaleOutputsExecuter.java:109) at org.gradle.api.internal.tasks.execution.FinalizePropertiesTaskExecuter.execute(FinalizePropertiesTaskExecuter.java:46) at org.gradle.api.internal.tasks.execution.ResolveTaskExecutionModeExecuter.execute(ResolveTaskExecutionModeExecuter.java:62) at org.gradle.api.internal.tasks.execution.SkipTaskWithNoActionsExecuter.execute(SkipTaskWithNoActionsExecuter.java:57) at org.gradle.api.internal.tasks.execution.SkipOnlyIfTaskExecuter.execute(SkipOnlyIfTaskExecuter.java:56) at org.gradle.api.internal.tasks.execution.CatchExceptionTaskExecuter.execute(CatchExceptionTaskExecuter.java:36) at org.gradle.api.internal.tasks.execution.EventFiringTaskExecuter$1.executeTask(EventFiringTaskExecuter.java:77) at org.gradle.api.internal.tasks.execution.EventFiringTaskExecuter$1.call(EventFiringTaskExecuter.java:55) at org.gradle.api.internal.tasks.execution.EventFiringTaskExecuter$1.call(EventFiringTaskExecuter.java:52) at org.gradle.internal.operations.DefaultBuildOperationExecutor$CallableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:416) at org.gradle.internal.operations.DefaultBuildOperationExecutor$CallableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:406) at org.gradle.internal.operations.DefaultBuildOperationExecutor$1.execute(DefaultBuildOperationExecutor.java:165) at org.gradle.internal.operations.DefaultBuildOperationExecutor.execute(DefaultBuildOperationExecutor.java:250) at org.gradle.internal. operations.DefaultBuildOperationExecutor.execute(DefaultBuildOperationExecutor.java:158) at org.gradle.internal.operations.DefaultBuildOperationExecutor.call(DefaultBuildOperationExecutor.java:102) at org.gradle.internal.operations.DelegatingBuildOperationExecutor.call(DelegatingBuildOperationExecutor.java:36) at org.gradle.api.internal.tasks.execution.EventFiringTaskExecuter.execute(EventFiringTaskExecuter.java:52) at org.gradle.execution.plan.LocalTaskNodeExecutor.execute(LocalTaskNodeExecutor.java:41) at org.gradle.execution.taskgraph.DefaultTaskExecutionGraph$InvokeNodeExecutorsAction.execute(DefaultTaskExecutionGraph.java:374) at org.gradle.execution.taskgraph.DefaultTaskExecutionGraph$InvokeNodeExecutorsAction.execute(DefaultTaskExecutionGraph.java:361) at org.gradle.execution.taskgraph.DefaultTaskExecutionGraph$BuildOperationAwareExecutionAction.execute(DefaultTaskExecutionGraph.java:354) at org.gradle.execution.taskgraph.DefaultTaskExecutionGraph$BuildOperationAwareExecutionAct ion.execute(DefaultTaskExecutionGraph.java:340) at org.gradle.execution.plan.DefaultPlanExecutor$ExecutorWorker.lambda$run$0(DefaultPlanExecutor.java:127) at org.gradle.execution.plan.DefaultPlanExecutor$ExecutorWorker.execute(DefaultPlanExecutor.java:191) at org.gradle.execution.plan.DefaultPlanExecutor$ExecutorWorker.executeNextNode(DefaultPlanExecutor.java:182) at org.gradle.execution.plan.DefaultPlanExecutor$ExecutorWorker.run(DefaultPlanExecutor.java:124) at org.gradle.internal.concurrent.ExecutorPolicy$CatchAndRecordFailures.onExecute(ExecutorPolicy.java:64) at org.gradle.internal.concurrent.ManagedExecutorImpl$1.run(ManagedExecutorImpl.java:48) at org.gradle.internal.concurrent.ThreadFactoryImpl$ManagedThreadRunnable.run(ThreadFactoryImpl.java:56) Caused by: org.gradle.process.internal.ExecException: A problem occurred starting process 'command 'mvn graphwalker:generate-sources'' at org.gradle.process.internal.DefaultExecHandle.execExceptionFor(DefaultExecHandle.java:241) at org .gradle.process.internal.DefaultExecHandle.setEndStateInfo(DefaultExecHandle.java:218) at org.gradle.process.internal.DefaultExecHandle.failed(DefaultExecHandle.java:372) at org.gradle.process.internal.ExecHandleRunner.run(ExecHandleRunner.java:87) at org.gradle.internal.operations.CurrentBuildOperationPreservingRunnable.run(CurrentBuildOperationPreservingRunnable.java:42) ... 3 more Caused by: net.rubygrapefruit.platform.NativeException: Could not start 'mvn graphwalker:generate-sources' at net.rubygrapefruit.platform.internal.DefaultProcessLauncher.start(DefaultProcessLauncher.java:27) at net.rubygrapefruit.platform.internal.WrapperProcessLauncher.start(WrapperProcessLauncher.java:36) at org.gradle.process.internal.ExecHandleRunner.startProcess(ExecHandleRunner.java:98) at org.gradle.process.internal.ExecHandleRunner.run(ExecHandleRunner.java:71) ... 4 more Caused by: java.io.IOException: Cannot run program "mvn graphwalker:generate-sources" (in directory "/Users/Sanchellios/WORK_DIR /experiments/maven-as-submodule/graph-gen"): error=2, No such file or directory at net.rubygrapefruit.platform.internal.DefaultProcessLauncher.start(DefaultProcessLauncher.java:25) ... 7 more Caused by: java.io.IOException: error=2, No such file or directory ... 8 more

I have even tried to generate maven wrapper inside of the graph-gen module - it didn't help.

Changing task to

task runMvnInterfaceGenerator(type: Exec) { dependsOn 'copyGraphsToGenerator' workingDir './graph-gen' args 'graphwalker:generate-sources' executable 'mvn' }

worked well. So, what's problem with commandLine ?

Answer 1

The commandLine arguments need to be passed individually:

task generateGraphBasedInterfaces(type: Exec) {
    workingDir rootProject.getProjectDir().getAbsolutePath() + "/graph-gen"
    commandLine "mvn", "graphwalker:generate-sources"
}

Also make sure to have mvn / mvn.cmd on $PATH .