Gradle 5 compatibility

[jaro-sagan]

Hi I have an issue with this plugin when used with Gradle 5. Here is the exception

* Exception is:
org.gradle.api.tasks.TaskExecutionException: Execution failed for task ':shared_searchcommon:javaccTimeDescriptionParser'.
        at org.gradle.api.internal.tasks.execution.ValidatingTaskExecuter.execute(ValidatingTaskExecuter.java:52)
        at org.gradle.api.internal.tasks.execution.SkipEmptySourceFilesTaskExecuter.execute(SkipEmptySourceFilesTaskExecuter.java:101)
        at org.gradle.api.internal.tasks.execution.CleanupStaleOutputsExecuter.execute(CleanupStaleOutputsExecuter.java:91)
        at org.gradle.api.internal.tasks.execution.FinalizePropertiesTaskExecuter.execute(FinalizePropertiesTaskExecuter.java:44)
        at org.gradle.api.internal.tasks.execution.ResolveTaskArtifactStateTaskExecuter.execute(ResolveTaskArtifactStateTaskExecuter.java:62)
        at org.gradle.api.internal.tasks.execution.SkipTaskWithNoActionsExecuter.execute(SkipTaskWithNoActionsExecuter.java:55)
        at org.gradle.api.internal.tasks.execution.SkipOnlyIfTaskExecuter.execute(SkipOnlyIfTaskExecuter.java:54)
        at org.gradle.api.internal.tasks.execution.CatchExceptionTaskExecuter.execute(CatchExceptionTaskExecuter.java:35)
        at org.gradle.api.internal.tasks.execution.EventFiringTaskExecuter$1.run(EventFiringTaskExecuter.java:49)
        at org.gradle.internal.operations.DefaultBuildOperationExecutor$RunnableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:301)
        at org.gradle.internal.operations.DefaultBuildOperationExecutor$RunnableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:293)
        at org.gradle.internal.operations.DefaultBuildOperationExecutor.execute(DefaultBuildOperationExecutor.java:175)
        at org.gradle.internal.operations.DefaultBuildOperationExecutor.run(DefaultBuildOperationExecutor.java:91)
        at org.gradle.internal.operations.DelegatingBuildOperationExecutor.run(DelegatingBuildOperationExecutor.java:31)
        at org.gradle.api.internal.tasks.execution.EventFiringTaskExecuter.execute(EventFiringTaskExecuter.java:44)
        at org.gradle.execution.plan.LocalTaskNodeExecutor.execute(LocalTaskNodeExecutor.java:43)
        at org.gradle.execution.taskgraph.DefaultTaskExecutionGraph$InvokeNodeExecutorsAction.execute(DefaultTaskExecutionGraph.java:337)
        at org.gradle.execution.taskgraph.DefaultTaskExecutionGraph$InvokeNodeExecutorsAction.execute(DefaultTaskExecutionGraph.java:325)
        at org.gradle.execution.taskgraph.DefaultTaskExecutionGraph$BuildOperationAwareExecutionAction.execute(DefaultTaskExecutionGraph.java:318)
        at org.gradle.execution.taskgraph.DefaultTaskExecutionGraph$BuildOperationAwareExecutionAction.execute(DefaultTaskExecutionGraph.java:304)
        at org.gradle.execution.plan.DefaultPlanExecutor$ExecutorWorker$1.execute(DefaultPlanExecutor.java:134)
        at org.gradle.execution.plan.DefaultPlanExecutor$ExecutorWorker$1.execute(DefaultPlanExecutor.java:129)
        at org.gradle.execution.plan.DefaultPlanExecutor$ExecutorWorker.execute(DefaultPlanExecutor.java:202)
        at org.gradle.execution.plan.DefaultPlanExecutor$ExecutorWorker.executeNextNode(DefaultPlanExecutor.java:193)
        at org.gradle.execution.plan.DefaultPlanExecutor$ExecutorWorker.run(DefaultPlanExecutor.java:129)
        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: java.lang.IllegalStateException: No value has been specified for this provider.
        at org.gradle.api.internal.provider.Collectors$NoValueCollector.collectInto(Collectors.java:294)
        at org.gradle.api.internal.provider.AbstractCollectionProperty.get(AbstractCollectionProperty.java:145)
        at org.gradle.api.internal.provider.AbstractCollectionProperty.get(AbstractCollectionProperty.java:37)
        at org.gradle.api.internal.provider.Collectors$ElementsFromCollectionProvider.collectInto(Collectors.java:235)
        at org.gradle.api.internal.provider.AbstractCollectionProperty.get(AbstractCollectionProperty.java:145)
        at org.gradle.api.internal.provider.AbstractCollectionProperty.get(AbstractCollectionProperty.java:37)
        at com.intershop.gradle.javacc.task.JavaCCTask.getJavaCCArgs(JavaCCTask.kt:382)
        at org.gradle.api.internal.tasks.properties.bean.AbstractNestedRuntimeBeanNode$DefaultPropertyValue$1$1.create(AbstractNestedRuntimeBeanNode.java:82)
        at org.gradle.util.SingleMessageLogger.whileDisabled(SingleMessageLogger.java:337)
        at org.gradle.api.internal.tasks.properties.bean.AbstractNestedRuntimeBeanNode$DefaultPropertyValue$1.get(AbstractNestedRuntimeBeanNode.java:79)
        at com.google.common.base.Suppliers$NonSerializableMemoizingSupplier.get(Suppliers.java:167)
        at org.gradle.api.internal.tasks.properties.bean.AbstractNestedRuntimeBeanNode$DefaultPropertyValue.getValue(AbstractNestedRuntimeBeanNode.java:145)
        at org.gradle.api.internal.tasks.properties.bean.AbstractNestedRuntimeBeanNode$DefaultPropertyValue.validate(AbstractNestedRuntimeBeanNode.java:163)
        at org.gradle.api.internal.tasks.DefaultTaskInputPropertySpec.validate(DefaultTaskInputPropertySpec.java:68)
        at org.gradle.api.internal.tasks.execution.DefaultTaskProperties.validate(DefaultTaskProperties.java:197)
        at org.gradle.api.internal.tasks.execution.ValidatingTaskExecuter.execute(ValidatingTaskExecuter.java:50)
        ... 27 more

and example of configuration how I use it:

javacc {
	javaCCVersion = '7.0.3'
	configs {
		timeDescriptionParser {
			inputFile = file("$projectDir/src/main/javacc/foo/bar/time/TimeDescriptionParser.jj")
			packageName = 'foo.bar.time'
		}
	}
}

I have also found an workaround. If you initialize args to an empty array it works.

javacc {
	javaCCVersion = '7.0.3'
	configs {
		timeDescriptionParser {
			inputFile = file("$projectDir/src/main/javacc/foo/bar/time/TimeDescriptionParser.jj")
			packageName = 'foo.bar.time'
			args = [] // fix for compatibility with Gradle 5
		}
	}
}

Would it be possible to fix compatibility with Gradle 5?