Gradle remembers old source code - groovy

Question

I want to create gradle custom task. The problem is that sometimes when I change something in source code, gradle shows error that in my code is error with that non existing code. For example I've created local variable timestamp and compiled project. Everything worked fine. But later I changed that variable to final ... TIMESTAMP. After that change gradle shows me error Could not find property 'timestamp'.... How to solve this problem? I assume that gradle has got cache?
Code
class MyCustomTask extends DefaultTask {
private final String TIMESTAMP = System.currentTimeMillis().toString()
public MyCustomTask() {
}
#TaskAction
def build() {
// do something
}
}
Exception
* Exception is:
org.gradle.api.GradleScriptException: A problem occurred evaluating project ':customer'.
at org.gradle.groovy.scripts.internal.DefaultScriptRunnerFactory$ScriptRunnerImpl.run(DefaultScriptRunnerFactory.ja
va:54)
at org.gradle.configuration.DefaultScriptPluginFactory$ScriptPluginImpl.apply(DefaultScriptPluginFactory.java:127)
at org.gradle.configuration.BuildScriptProcessor.execute(BuildScriptProcessor.java:36)
at org.gradle.configuration.BuildScriptProcessor.execute(BuildScriptProcessor.java:23)
at org.gradle.configuration.ConfigureActionsProjectEvaluator.evaluate(ConfigureActionsProjectEvaluator.java:34)
at org.gradle.configuration.LifecycleProjectEvaluator.evaluate(LifecycleProjectEvaluator.java:55)
at org.gradle.api.internal.project.AbstractProject.evaluate(AbstractProject.java:465)
at org.gradle.api.internal.project.AbstractProject.evaluate(AbstractProject.java:76)
at org.gradle.configuration.DefaultBuildConfigurer.configure(DefaultBuildConfigurer.java:31)
at org.gradle.initialization.DefaultGradleLauncher.doBuildStages(DefaultGradleLauncher.java:142)
at org.gradle.initialization.DefaultGradleLauncher.doBuild(DefaultGradleLauncher.java:113)
at org.gradle.initialization.DefaultGradleLauncher.run(DefaultGradleLauncher.java:81)
at org.gradle.launcher.exec.InProcessBuildActionExecuter$DefaultBuildController.run(InProcessBuildActionExecuter.ja
va:64)
at org.gradle.launcher.cli.ExecuteBuildAction.run(ExecuteBuildAction.java:33)
at org.gradle.launcher.cli.ExecuteBuildAction.run(ExecuteBuildAction.java:24)
at org.gradle.launcher.exec.InProcessBuildActionExecuter.execute(InProcessBuildActionExecuter.java:35)
at org.gradle.launcher.exec.InProcessBuildActionExecuter.execute(InProcessBuildActionExecuter.java:26)
at org.gradle.launcher.cli.RunBuildAction.run(RunBuildAction.java:50)
at org.gradle.api.internal.Actions$RunnableActionAdapter.execute(Actions.java:171)
at org.gradle.launcher.cli.CommandLineActionFactory$ParseAndBuildAction.execute(CommandLineActionFactory.java:201)
at org.gradle.launcher.cli.CommandLineActionFactory$ParseAndBuildAction.execute(CommandLineActionFactory.java:174)
at org.gradle.launcher.cli.CommandLineActionFactory$WithLogging.execute(CommandLineActionFactory.java:170)
at org.gradle.launcher.cli.CommandLineActionFactory$WithLogging.execute(CommandLineActionFactory.java:139)
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:48)
at org.gradle.launcher.bootstrap.EntryPoint.run(EntryPoint.java:45)
at org.gradle.launcher.Main.main(Main.java:39)
at org.gradle.launcher.bootstrap.ProcessBootstrap.runNoExit(ProcessBootstrap.java:50)
at org.gradle.launcher.bootstrap.ProcessBootstrap.run(ProcessBootstrap.java:32)
at org.gradle.launcher.GradleMain.main(GradleMain.java:26)
Caused by: org.gradle.api.tasks.TaskInstantiationException: Could not create task of type 'MyCustomTask'.
at org.gradle.api.internal.project.taskfactory.TaskFactory$1.call(TaskFactory.java:115)
at org.gradle.api.internal.project.taskfactory.TaskFactory$1.call(TaskFactory.java:110)
at org.gradle.api.internal.AbstractTask.injectIntoNewInstance(AbstractTask.java:141)
at org.gradle.api.internal.project.taskfactory.TaskFactory.createTaskObject(TaskFactory.java:110)
at org.gradle.api.internal.project.taskfactory.TaskFactory.createTask(TaskFactory.java:70)
at org.gradle.api.internal.project.taskfactory.AnnotationProcessingTaskFactory.createTask(AnnotationProcessingTaskF
actory.java:98)
at org.gradle.api.internal.project.taskfactory.DependencyAutoWireTaskFactory.createTask(DependencyAutoWireTaskFacto
ry.java:39)
at org.gradle.api.internal.tasks.DefaultTaskContainer.create(DefaultTaskContainer.java:53)
at org.gradle.api.internal.project.AbstractProject.task(AbstractProject.java:908)
at org.gradle.api.internal.BeanDynamicObject$MetaClassAdapter.invokeMethod(BeanDynamicObject.java:216)
at org.gradle.api.internal.BeanDynamicObject.invokeMethod(BeanDynamicObject.java:122)
at org.gradle.api.internal.CompositeDynamicObject.invokeMethod(CompositeDynamicObject.java:147)
at org.gradle.groovy.scripts.BasicScript.methodMissing(BasicScript.java:83)
at build_1i1akohldagki7rlpcas5oct58.run(C:\workspace-eclipse-juno\Is2k8\customer\build.gradle:19)
at org.gradle.groovy.scripts.internal.DefaultScriptRunnerFactory$ScriptRunnerImpl.run(DefaultScriptRunnerFactory.ja
va:52)
... 30 more
Caused by: groovy.lang.MissingPropertyException: Could not find property 'timestamp' on task ':customer:is2k8Test'.
at org.gradle.api.internal.AbstractDynamicObject.propertyMissingException(AbstractDynamicObject.java:43)
at org.gradle.api.internal.AbstractDynamicObject.getProperty(AbstractDynamicObject.java:35)
at org.gradle.api.internal.CompositeDynamicObject.getProperty(CompositeDynamicObject.java:94)
at pl.ydp.gradle.MyCustomTask_Decorated.getProperty(Unknown Source)
at pl.ydp.gradle.MyCustomTask.<init>(MyCustomTask.groovy:15)
at pl.ydp.gradle.MyCustomTask_Decorated.<init>(Unknown Source)
at org.gradle.api.internal.DependencyInjectingInstantiator.newInstance(DependencyInjectingInstantiator.java:62)
at org.gradle.api.internal.ClassGeneratorBackedInstantiator.newInstance(ClassGeneratorBackedInstantiator.java:36)
at org.gradle.api.internal.project.taskfactory.TaskFactory$1.call(TaskFactory.java:113)
... 44 more
At the end you will find Caused by: groovy.lang.MissingPropertyException: Could not find property 'timestamp' on task ':customer:is2k8Test'.