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 Looks like the eclipse plugin is havign trouble with my version string. I'll admit it is a bit on the long side, but as far as I know there is not a restriction on the format of the version string. 
crotwell$ cat build.gradle 
group = "edu.sc.seis" 
version = "2.0beta10_localMod" 
sourceCompatibility = 1.5 
apply plugin: 'java' 
apply plugin: 'eclipse' 
repositories  
{
flatDir name: 'localRepository', dirs: 'lib'
mavenRepo urls: "http://www.seis.sc.edu/software/maven2"
mavenCentral()
}
defaultTasks "clean", "jar" 
dependencies  
{
compile "org.slf4j:slf4j-log4j12:1.6.1"
compile "edu.sc.seis:seisFile:1.2"
compile "jython:jython:2.5.1"
testCompile "junit:junit:4.8.1"
}
crotwell$ gradle --stacktrace eclipse 
:eclipseClasspath 
:eclipseJdt 
FAILURE: Build failed with an exception. 
- What went wrong:
 
Execution failed for task ':eclipseJdt'. 
Cause: java.math.BigDecimal cannot be cast to org.gradle.api.JavaVersion 
 
- Try:
 
Run with --info or --debug option to get more log output. 
 
- Exception is:
 
org.gradle.api.tasks.TaskExecutionException: Execution failed for task ':eclipseJdt'. 
at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.executeActions(ExecuteActionsTaskExecuter.java:71) 
at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.execute(ExecuteActionsTaskExecuter.java:48) 
at org.gradle.api.internal.tasks.execution.PostExecutionAnalysisTaskExecuter.execute(PostExecutionAnalysisTaskExecuter.java:34) 
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.execute(AbstractTask.java:237) 
at org.gradle.execution.DefaultTaskGraphExecuter.executeTask(DefaultTaskGraphExecuter.java:167) 
at org.gradle.execution.DefaultTaskGraphExecuter.doExecute(DefaultTaskGraphExecuter.java:160) 
at org.gradle.execution.DefaultTaskGraphExecuter.execute(DefaultTaskGraphExecuter.java:78) 
at org.gradle.execution.TaskNameResolvingBuildExecuter.execute(TaskNameResolvingBuildExecuter.java:113) 
at org.gradle.execution.DelegatingBuildExecuter.execute(DelegatingBuildExecuter.java:54) 
at org.gradle.initialization.DefaultGradleLauncher.doBuildStages(DefaultGradleLauncher.java:158) 
at org.gradle.initialization.DefaultGradleLauncher.doBuild(DefaultGradleLauncher.java:112) 
at org.gradle.initialization.DefaultGradleLauncher.run(DefaultGradleLauncher.java:80) 
at org.gradle.launcher.RunBuildAction.execute(RunBuildAction.java:41) 
at org.gradle.launcher.RunBuildAction.execute(RunBuildAction.java:27) 
at org.gradle.launcher.ExceptionReportingAction.execute(ExceptionReportingAction.java:32) 
at org.gradle.launcher.ExceptionReportingAction.execute(ExceptionReportingAction.java:21) 
at org.gradle.launcher.CommandLineActionFactory$WithLoggingAction.execute(CommandLineActionFactory.java:219) 
at org.gradle.launcher.CommandLineActionFactory$WithLoggingAction.execute(CommandLineActionFactory.java:203) 
at org.gradle.launcher.Main.execute(Main.java:55) 
at org.gradle.launcher.Main.main(Main.java:40) 
at org.gradle.launcher.ProcessBootstrap.runNoExit(ProcessBootstrap.java:46) 
at org.gradle.launcher.ProcessBootstrap.run(ProcessBootstrap.java:28) 
at org.gradle.launcher.GradleMain.main(GradleMain.java:24) 
Caused by: java.lang.ClassCastException: java.math.BigDecimal cannot be cast to org.gradle.api.JavaVersion 
at org.gradle.plugins.ide.eclipse.model.EclipseJdt_Decorated.getSourceCompatibility(Unknown Source) 
at org.gradle.api.internal.BeanDynamicObject.getProperty(BeanDynamicObject.java:86) 
at org.gradle.api.internal.CompositeDynamicObject.getProperty(CompositeDynamicObject.java:51) 
at org.gradle.plugins.ide.eclipse.model.EclipseJdt_Decorated.getProperty(Unknown Source) 
at org.gradle.plugins.ide.eclipse.GenerateEclipseJdt$1.configure(GenerateEclipseJdt.groovy:63) 
at org.gradle.plugins.ide.eclipse.GenerateEclipseJdt$1.configure(GenerateEclipseJdt.groovy) 
at org.gradle.plugins.ide.api.GeneratorTask.generate(GeneratorTask.java:69) 
at org.gradle.api.internal.BeanDynamicObject.invokeMethod(BeanDynamicObject.java:158) 
at org.gradle.api.internal.CompositeDynamicObject.invokeMethod(CompositeDynamicObject.java:93) 
at org.gradle.plugins.ide.eclipse.GenerateEclipseJdt_Decorated.invokeMethod(Unknown Source) 
at org.gradle.util.ReflectionUtil.invoke(ReflectionUtil.groovy:23) 
at org.gradle.api.internal.project.taskfactory.AnnotationProcessingTaskFactory$2.execute(AnnotationProcessingTaskFactory.java:129) 
at org.gradle.api.internal.project.taskfactory.AnnotationProcessingTaskFactory$2.execute(AnnotationProcessingTaskFactory.java:127) 
at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.executeActions(ExecuteActionsTaskExecuter.java:63) 
... 28 more 
 
BUILD FAILED 
Total time: 6.425 secs 
 
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