# Java.lang.ClassCastException: com.ford.it.gradle.plugins.builddependencies.VersionSuffixTask\_Decorated incompatible with java.lang.Class

**URL:** <https://discuss.gradle.org/t/java-lang-classcastexception-com-ford-it-gradle-plugins-builddependencies-versionsuffixtask-decorated-incompatible-with-java-lang-class/15317>\
**Category:** Help/Discuss\
**Created:** [March 21, 2016, 1:06pm UTC](https://discuss.gradle.org/t/java-lang-classcastexception-com-ford-it-gradle-plugins-builddependencies-versionsuffixtask-decorated-incompatible-with-java-lang-class/15317 "2016-03-21T13:06:13Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![curtisjreinke](https://avatars.discourse-cdn.com/v4/letter/c/919ad9/32.png) [@curtisjreinke](https://discuss.gradle.org/u/curtisjreinke)\
**Post date:** [March 21, 2016, 1:06pm UTC](https://discuss.gradle.org/t/java-lang-classcastexception-com-ford-it-gradle-plugins-builddependencies-versionsuffixtask-decorated-incompatible-with-java-lang-class/15317/1 "2016-03-21T13:06:13Z")

</div>

I’ve written a simple Gradle plugin and task to add a version suffix to the version property of a project as follows:

> package com.ford.it.gradle.plugins.builddependencies;

> import org.gradle.api.Plugin;  
> import org.gradle.api.Project;

> public class VersionSuffixPlugin implements Plugin{  
> @Override  
> public void apply(Project project) {  
> project.getTasks().create(“VersionSuffixTask”, VersionSuffixTask.class);  
> }  
> }

> package com.ford.it.gradle.plugins.builddependencies;

> import org.gradle.api.DefaultTask;  
> import org.gradle.api.Project;  
> import org.gradle.api.tasks.TaskAction;

> public class VersionSuffixTask extends DefaultTask {
> 
> ```
> @TaskAction
> public void setVersionUsingBuildTypeSuffix() { 
> final Project project = getProject();
> final String buildType = (String) project.getProperties().get("buildType");
> final String version = (String) project.getProperties().get("version");
>     
> System.out.println("Test");
> String versionSuffix = null;
>     
> if (buildType == null || buildType.equals("SNAPSHOT")) {
> versionSuffix = "-SNAPSHOT";
> } else if (buildType.equals("PRODUCTION_RELEASE_CANDIDATE")) {
> versionSuffix = "-PRODUCTION_RELEASE_CANDIDATE";
> } else if (buildType.equals("PRODUCTION")) {
> versionSuffix = "";
> } else {
> versionSuffix = "-" + buildType;
> }
> project.setProperty("version", version + versionSuffix);
> }
> 
> ```
> 
> }

To test it, I’ve created another simple Gradle project containing the following build.gradle script:

> apply plugin: ‘maven’  
> apply plugin: ‘java’  
> apply plugin: ‘com.ford.it.gradle.plugins.builddependencies.versionsuffix’

> version = ‘1.2.0.0’

> task versionSuffixTask(type: VersionSuffixTask)  
> versionSuffixTask.setVersionUsingBuildTypeSuffix()  
> println version

> buildscript {  
> ext.defaultRepository = {  
> mavenLocal()
> 
> ```
> maven {
> url "http://www.nexus.ford.com/content/repositories/ford_experimental_repository/"
> }
>     
> maven {
> url "http://www.nexus.ford.com/content/groups/public/"
> }
> }
> repositories defaultRepository
> 
> dependencies {
> classpath "com.ford.it.gradle.plugins.builddependencies:GradlePlugins:1.0.0-SNAPSHOT"
> }
> 
> ```
> 
> }

When I try running the script, I get the following. Using a 1.6 JDK if that matters:

> Working Directory: C:\Projects\GradlePluginsTester  
> Gradle User Home: C:\Users\CREINKE3.gradle  
> Gradle Distribution: Local installation at C:\ford\gradle\gradle-2.8  
> Gradle Version: 2.8  
> Java Home: C:\IBM\WAS80\java  
> JVM Arguments: None  
> Program Arguments: --stacktrace  
> Gradle Tasks: clean build

> FAILURE: Build failed with an exception.

> - Where:  
> Build file ‘C:\Projects\GradlePluginsTester\build.gradle’ line: 7

> - What went wrong:  
> A problem occurred evaluating root project ‘GradlePluginsTester’.
> 
> > com.ford.it.gradle.plugins.builddependencies.VersionSuffixTask\_Decorated incompatible with java.lang.Class

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

> - Exception is:  
> org.gradle.api.GradleScriptException: A problem occurred evaluating root project ‘GradlePluginsTester’.  
> at org.gradle.groovy.scripts.internal.DefaultScriptRunnerFactory$ScriptRunnerImpl.run(DefaultScriptRunnerFactory.java:93)  
> at org.gradle.configuration.DefaultScriptPluginFactory$ScriptPluginImpl$1.run(DefaultScriptPluginFactory.java:148)  
> at org.gradle.configuration.ProjectScriptTarget.addConfiguration(ProjectScriptTarget.java:72)  
> at org.gradle.configuration.DefaultScriptPluginFactory$ScriptPluginImpl.apply(DefaultScriptPluginFactory.java:153)  
> at org.gradle.configuration.project.BuildScriptProcessor.execute(BuildScriptProcessor.java:38)  
> at org.gradle.configuration.project.BuildScriptProcessor.execute(BuildScriptProcessor.java:25)  
> at org.gradle.configuration.project.ConfigureActionsProjectEvaluator.evaluate(ConfigureActionsProjectEvaluator.java:34)  
> at org.gradle.configuration.project.LifecycleProjectEvaluator.evaluate(LifecycleProjectEvaluator.java:55)  
> at org.gradle.api.internal.project.AbstractProject.evaluate(AbstractProject.java:499)  
> at org.gradle.api.internal.project.AbstractProject.evaluate(AbstractProject.java:86)  
> at org.gradle.execution.TaskPathProjectEvaluator.configureHierarchy(TaskPathProjectEvaluator.java:42)  
> at org.gradle.configuration.DefaultBuildConfigurer.configure(DefaultBuildConfigurer.java:35)  
> at org.gradle.initialization.DefaultGradleLauncher$2.run(DefaultGradleLauncher.java:125)  
> 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:122)  
> 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.runner.BuildModelActionRunner.run(BuildModelActionRunner.java:46)  
> at org.gradle.launcher.exec.ChainingBuildActionRunner.run(ChainingBuildActionRunner.java:35)  
> at org.gradle.tooling.internal.provider.runner.SubscribableBuildActionRunner.run(SubscribableBuildActionRunner.java:58)  
> 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:77)  
> at org.gradle.launcher.exec.ContinuousBuildActionExecuter.execute(ContinuousBuildActionExecuter.java:47)  
> at org.gradle.launcher.daemon.server.exec.ExecuteBuild.doBuild(ExecuteBuild.java:52)  
> at org.gradle.launcher.daemon.server.exec.BuildCommandOnly.execute(BuildCommandOnly.java:36)  
> at org.gradle.launcher.daemon.server.api.DaemonCommandExecution.proceed(DaemonCommandExecution.java:120)  
> at org.gradle.launcher.daemon.server.exec.WatchForDisconnection.execute(WatchForDisconnection.java:37)  
> at org.gradle.launcher.daemon.server.api.DaemonCommandExecution.proceed(DaemonCommandExecution.java:120)  
> at org.gradle.launcher.daemon.server.exec.ResetDeprecationLogger.execute(ResetDeprecationLogger.java:26)  
> at org.gradle.launcher.daemon.server.api.DaemonCommandExecution.proceed(DaemonCommandExecution.java:120)  
> at org.gradle.launcher.daemon.server.exec.RequestStopIfSingleUsedDaemon.execute(RequestStopIfSingleUsedDaemon.java:34)  
> at org.gradle.launcher.daemon.server.api.DaemonCommandExecution.proceed(DaemonCommandExecution.java:120)  
> at org.gradle.launcher.daemon.server.exec.ForwardClientInput$2.call(ForwardClientInput.java:74)  
> at org.gradle.launcher.daemon.server.exec.ForwardClientInput$2.call(ForwardClientInput.java:72)  
> at org.gradle.util.Swapper.swap(Swapper.java:38)  
> at org.gradle.launcher.daemon.server.exec.ForwardClientInput.execute(ForwardClientInput.java:72)  
> at org.gradle.launcher.daemon.server.api.DaemonCommandExecution.proceed(DaemonCommandExecution.java:120)  
> at org.gradle.launcher.daemon.server.health.DaemonHealthTracker.execute(DaemonHealthTracker.java:47)  
> at org.gradle.launcher.daemon.server.api.DaemonCommandExecution.proceed(DaemonCommandExecution.java:120)  
> at org.gradle.launcher.daemon.server.exec.LogToClient.doBuild(LogToClient.java:66)  
> at org.gradle.launcher.daemon.server.exec.BuildCommandOnly.execute(BuildCommandOnly.java:36)  
> at org.gradle.launcher.daemon.server.api.DaemonCommandExecution.proceed(DaemonCommandExecution.java:120)  
> at org.gradle.launcher.daemon.server.exec.EstablishBuildEnvironment.doBuild(EstablishBuildEnvironment.java:71)  
> at org.gradle.launcher.daemon.server.exec.BuildCommandOnly.execute(BuildCommandOnly.java:36)  
> at org.gradle.launcher.daemon.server.api.DaemonCommandExecution.proceed(DaemonCommandExecution.java:120)  
> at org.gradle.launcher.daemon.server.health.HintGCAfterBuild.execute(HintGCAfterBuild.java:41)  
> at org.gradle.launcher.daemon.server.api.DaemonCommandExecution.proceed(DaemonCommandExecution.java:120)  
> at org.gradle.launcher.daemon.server.exec.StartBuildOrRespondWithBusy$1.run(StartBuildOrRespondWithBusy.java:50)  
> at org.gradle.launcher.daemon.server.DaemonStateCoordinator$1.run(DaemonStateCoordinator.java:246)  
> at org.gradle.internal.concurrent.ExecutorPolicy$CatchAndRecordFailures.onExecute(ExecutorPolicy.java:54)  
> at org.gradle.internal.concurrent.StoppableExecutorImpl$1.run(StoppableExecutorImpl.java:40)  
> Caused by: java.lang.ClassCastException: com.ford.it.gradle.plugins.builddependencies.VersionSuffixTask\_Decorated incompatible with java.lang.Class  
> at org.gradle.api.internal.project.taskfactory.TaskFactory.createTask(TaskFactory.java:76)  
> at org.gradle.api.internal.project.taskfactory.AnnotationProcessingTaskFactory.createTask(AnnotationProcessingTaskFactory.java:100)  
> at org.gradle.api.internal.project.taskfactory.DependencyAutoWireTaskFactory.createTask(DependencyAutoWireTaskFactory.java:39)  
> at org.gradle.api.internal.tasks.DefaultTaskContainer.create(DefaultTaskContainer.java:62)  
> at org.gradle.api.internal.project.AbstractProject.task(AbstractProject.java:882)  
> at org.gradle.api.internal.BeanDynamicObject$MetaClassAdapter.invokeMethod(BeanDynamicObject.java:232)  
> at org.gradle.api.internal.BeanDynamicObject.invokeMethod(BeanDynamicObject.java:127)  
> at org.gradle.api.internal.CompositeDynamicObject.invokeMethod(CompositeDynamicObject.java:150)  
> at org.gradle.groovy.scripts.BasicScript.methodMissing(BasicScript.java:79)  
> at build\_29l5mumczv69elh12l9usq7no.run(C:\Projects\GradlePluginsTester\build.gradle:7)  
> at org.gradle.groovy.scripts.internal.DefaultScriptRunnerFactory$ScriptRunnerImpl.run(DefaultScriptRunnerFactory.java:91)  
> … 60 more

> BUILD FAILED

> Total time: 0.167 secs

---

<div class="post-metadata">

**Author:** ![st\_oehme](https://sea1.discourse-cdn.com/gradle/user_avatar/discuss.gradle.org/st_oehme/32/5249_2.png) [@st\_oehme](https://discuss.gradle.org/u/st_oehme)\
**Post date:** [March 22, 2016, 10:45pm UTC](https://discuss.gradle.org/t/java-lang-classcastexception-com-ford-it-gradle-plugins-builddependencies-versionsuffixtask-decorated-incompatible-with-java-lang-class/15317/2 "2016-03-22T22:45:26Z")

</div>

> [@curtisjreinke](#):
>
> project.getTasks().create(“VersionSuffixTask”, VersionSuffixTask.class);

> [@curtisjreinke](#):
>
> task versionSuffixTask(type: VersionSuffixTask)

These two lines produce a conflict. The first creates an uppercase variable that looks like a class literal, but isn’t 😉

You probably wanted to have a lower-case task name and then configure that task instead of creating another one. Also, you should not call the tasks action yourself. This is Gradle’s job.

A task that modifies the project model is usually a bad idea, because that configuration change will come long after everyone else has read the version property. You probably just want a lazy Version class.

Also, use `project.setVersion()`, not `project.setProperty("version", version + versionSuffix)`