Problem with javaExec

CeyhunMamedov · April 9, 2012, 11:40am

gradle JavaExec task do not work for me. other task like compile, classes, build and so on work properly. I can build code, and I can see class files, I can even execute class files manually. But JavaExec task gives error “No main class specified”.

I have tried many things but no success.

May be there is a know miscompatability with some other tools like Python, Maven

Below I give my conf. and example that do not work

I have setup GRADLE_HOME, JAVA_HOME env.var. Path to %GRADLE_HOME%\bin, %JAVA_HOME%\bin

I use gradle 1.0 milestone-9

java version “1.6.0_23”

Java™ SE Runtime Environment (build 1.6.0_23-b05)

Java HotSpot™ 64-Bit Server VM (build 19.0-b09, mixed mode)

Project directory layout (tree)

  |---.gradle  |

|---1.0-milestone-9  |



 |---taskArtifacts  |---.settings  |---build  |

|---classes  |

|

|---main  |

|



 |---com  |

|





  |---deneme  |

|---dependency-cache  |---src



|---main





 |---java







  |---com











|---deneme

code for sample java “src\main\java\com\deneme\DDeneme.java”

package com.deneme;
  public class DDeneme {
 public static void main (String[] args)throws Exception
 {
  System.out.println("Hi there");
 }
}

apply plugin: 'java'
  task
(calistir, dependsOn : classes, type: JavaExec) << {
 main = "com.deneme.DDeneme"
 classpath sourceSets.main.classesDir
 classpath configurations.runtime
}

stacktrace

FAILURE: Build failed with an exception.
  * What went wrong:
Execution failed for task ':calistir'.
> No main class specified
  * Try:
Run with --info or --debug option to get more log output.
  * Exception is:
org.gradle.api.tasks.TaskExecutionException: Execution failed for task ':calistir'.
        at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.executeActions(ExecuteActionsTaskExecuter.java:68)
        at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.execute(ExecuteActionsTaskExecuter.java:46)
        at org.gradle.api.internal.tasks.execution.PostExecutionAnalysisTaskExecuter.execute(PostExecutionAnalysisTaskExecuter.java:34)
        at org.gradle.api.internal.changedetection.CacheLockHandlingTaskExecuter
$1.run(CacheLockHandlingTaskExecuter.java:34)
        at org.gradle.cache.internal.DefaultCacheAccess$2.create(DefaultCacheAccess.java:200)
        at org.gradle.cache.internal.DefaultCacheAccess.longRunningOperation(DefaultCacheAccess.java:172)
        at org.gradle.cache.internal.DefaultCacheAccess.longRunningOperation(DefaultCacheAccess.java:198)
        at org.gradle.cache.internal.DefaultPersistentDirectoryStore.longRunningOperation(DefaultPersistentDirectoryStore.java:111)
        at org.gradle.api.internal.changedetection.DefaultTaskArtifactStateCacheAccess.longRunningOperation(DefaultTaskArtifactStateCacheAccess.java:83)
        at org.gradle.api.internal.changedetection.CacheLockHandlingTaskExecuter.execute(CacheLockHandlingTaskExecuter.java:32)
        at org.gradle.api.internal.tasks.execution.SkipUpToDateTaskExecuter.execute(SkipUpToDateTaskExecuter.java:55)
        at org.gradle.api.internal.tasks.execution.ValidatingTaskExecuter.execute(ValidatingTaskExecuter.java:57)
        at org.gradle.api.internal.tasks.execution.SkipEmptySourceFilesTaskExecuter.execute(SkipEmptySourceFilesTaskExecuter.java:41)
        at org.gradle.api.internal.tasks.execution.SkipTaskWithNoActionsExecuter.execute(SkipTaskWithNoActionsExecuter.java:51)
        at org.gradle.api.internal.tasks.execution.SkipOnlyIfTaskExecuter.execute(SkipOnlyIfTaskExecuter.java:52)
        at org.gradle.api.internal.tasks.execution.ExecuteAtMostOnceTaskExecuter.execute(ExecuteAtMostOnceTaskExecuter.java:42)
        at org.gradle.api.internal.AbstractTask.executeWithoutThrowingTaskFailure(AbstractTask.java:247)
        at org.gradle.execution.DefaultTaskGraphExecuter.executeTask(DefaultTaskGraphExecuter.java:192)
        at org.gradle.execution.DefaultTaskGraphExecuter.doExecute(DefaultTaskGraphExecuter.java:177)
        at org.gradle.execution.DefaultTaskGraphExecuter.execute(DefaultTaskGraphExecuter.java:83)
        at org.gradle.execution.SelectedTaskExecutionAction.execute(SelectedTaskExecutionAction.java:36)
        at org.gradle.execution.DefaultBuildExecuter.execute(DefaultBuildExecuter.java:61)
        at org.gradle.execution.DefaultBuildExecuter.access$200(DefaultBuildExecuter.java:23)
        at org.gradle.execution.DefaultBuildExecuter$2.proceed(DefaultBuildExecuter.java:67)
        at org.gradle.api.internal.changedetection.TaskCacheLockHandlingBuildExecuter$1.run(TaskCacheLockHandlingBuildExecuter.java:31)
        at org.gradle.cache.internal.DefaultCacheAccess$1.create(DefaultCacheAccess.java:111)
        at org.gradle.cache.internal.DefaultCacheAccess.useCache(DefaultCacheAccess.java:126)
        at org.gradle.cache.internal.DefaultCacheAccess.useCache(DefaultCacheAccess.java:109)
        at org.gradle.cache.internal.DefaultPersistentDirectoryStore.useCache(DefaultPersistentDirectoryStore.java:103)
        at org.gradle.api.internal.changedetection.DefaultTaskArtifactStateCacheAccess.useCache(DefaultTaskArtifactStateCacheAccess.java:79)
        at org.gradle.api.internal.changedetection.TaskCacheLockHandlingBuildExecuter.execute(TaskCacheLockHandlingBuildExecuter.java:29)
        at org.gradle.execution.DefaultBuildExecuter.execute(DefaultBuildExecuter.java:61)
        at org.gradle.execution.DefaultBuildExecuter.access$200(DefaultBuildExecuter.java:23)
        at org.gradle.execution.DefaultBuildExecuter$2.proceed(DefaultBuildExecuter.java:67)
        at org.gradle.execution.DryRunBuildExecutionAction.execute(DryRunBuildExecutionAction.java:32)
        at org.gradle.execution.DefaultBuildExecuter.execute(DefaultBuildExecuter.java:61)
        at org.gradle.execution.DefaultBuildExecuter.execute(DefaultBuildExecuter.java:54)
        at org.gradle.initialization.DefaultGradleLauncher.doBuildStages(DefaultGradleLauncher.java:155)
        at org.gradle.initialization.DefaultGradleLauncher.doBuild(DefaultGradleLauncher.java:110)
        at org.gradle.initialization.DefaultGradleLauncher.run(DefaultGradleLauncher.java:78)
        at org.gradle.launcher.cli.RunBuildAction.execute(RunBuildAction.java:42)
        at org.gradle.launcher.cli.RunBuildAction.execute(RunBuildAction.java:28)
        at org.gradle.launcher.exec.ExceptionReportingAction.execute(ExceptionReportingAction.java:32)
        at org.gradle.launcher.exec.ExceptionReportingAction.execute(ExceptionReportingAction.java:21)
        at org.gradle.launcher.cli.CommandLineActionFactory$WithLoggingAction.execute(CommandLineActionFactory.java:302)
        at org.gradle.launcher.cli.CommandLineActionFactory$WithLoggingAction.execute(CommandLineActionFactory.java:286)
        at org.gradle.launcher.Main.doAction(Main.java:48)
        at org.gradle.launcher.exec.EntryPoint$1.execute(EntryPoint.java:53)
        at org.gradle.launcher.exec.EntryPoint$1.execute(EntryPoint.java:51)
        at org.gradle.launcher.exec.Execution.execute(Execution.java:28)
        at org.gradle.launcher.exec.EntryPoint.run(EntryPoint.java:39)
        at org.gradle.launcher.Main.main(Main.java:39)
        at org.gradle.launcher.ProcessBootstrap.runNoExit(ProcessBootstrap.java:51)
        at org.gradle.launcher.ProcessBootstrap.run(ProcessBootstrap.java:33)
        at org.gradle.launcher.GradleMain.main(GradleMain.java:24)
Caused by: java.lang.IllegalStateException: No main class specified
        at org.gradle.process.internal.JavaExecHandleBuilder.build(JavaExecHandleBuilder.java:211)
        at org.gradle.process.internal.DefaultJavaExecAction.execute(DefaultJavaExecAction.java:31)
        at org.gradle.api.tasks.JavaExec.exec(JavaExec.java:50)
        at org.gradle.api.internal.BeanDynamicObject$MetaClassAdapter.invokeMethod(BeanDynamicObject.java:196)
        at org.gradle.api.internal.BeanDynamicObject.invokeMethod(BeanDynamicObject.java:102)
        at org.gradle.api.internal.CompositeDynamicObject.invokeMethod(CompositeDynamicObject.java:99)
        at org.gradle.api.tasks.JavaExec_Decorated.invokeMethod(Unknown Source)
        at org.gradle.util.ReflectionUtil.invoke(ReflectionUtil.groovy:23)
        at org.gradle.api.internal.project.taskfactory.AnnotationProcessingTaskFactory$4.execute(AnnotationProcessingTaskFactory.java:150)
        at org.gradle.api.internal.project.taskfactory.AnnotationProcessingTaskFactory$4.execute(AnnotationProcessingTaskFactory.java:145)
        at org.gradle.api.internal.AbstractTask$TaskActionWrapper.execute(AbstractTask.java:477)
        at org.gradle.api.internal.AbstractTask$TaskActionWrapper.execute(AbstractTask.java:466)
        at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.executeActions(ExecuteActionsTaskExecuter.java:60)
        ... 54 more

Szczepan_Faber · April 10, 2012, 9:34am

task
(calistir, dependsOn : classes, type: JavaExec) << {
//Note the '<< {}' is an equivalent to doLast {}

Looks like you’re adding an action instead of configuring the the task, all your configuration on the task happens too late, that is at the execution time.

I’m also wondering if it wouldn’t be nicer if you used classpath like: classpath sourceSets.main.output and drop the hardwired dependency to ‘classes’ task. sourceSets.main.output knows what builds it so the task dependencies can be inferred.

Hope that helps!

CeyhunMamedov · April 12, 2012, 6:52pm

thank you very much,

I don’t know how I managed use this construct…

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