Doing a web project means: Java (jdk 1.7.0.51) + Spring framework (+velocity) + Hibernate + Gradle + Apache Tomcat.
Suddenly, there was a problem: you can not make a build. To build using Gradle.

> 
> 16:50:30: Executing external task 'build'...
>  :compileJava
>  :processResources UP-TO-DATE
>  :classes
>  :jar
>  :bootRepackage FAILED
>  FAILURE: Build failed with an exception.
>  \* What went wrong:
>  Execution failed for task ':bootRepackage'.
>  MALFORMED
>  \* Try:
>  Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output.
>  BUILD FAILED
>  Total time: 14.935 secs
>  MALFORMED
> 
> 
> 

What could be the problem?

The full log:

> 
> :bootRepackage FAILED  
> 
>  FAILURE: Build failed with an exception.  
> 
>  \* What went wrong:
>  Execution failed for task ':bootRepackage'.
>  MALFORMED  
> 
>  \* Try:  
> 
>  Run with --info or --debug option to get more log output.  
> 
>  \* Exception is:
>  org.gradle.api.tasks.TaskExecutionException: Execution failed for task ':bootRepackage'.
>  at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.executeActions(ExecuteActionsTaskExecuter.
>  java:69)
>  at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.execute(ExecuteActionsTaskExecuter.java:46
>  )
>  at org.gradle.api.internal.tasks.execution.PostExecutionAnalysisTaskExecuter.execute(PostExecutionAnalysisTaskEx
>  ecuter.java:35)
>  at org.gradle.api.internal.tasks.execution.SkipUpToDateTaskExecuter.execute(SkipUpToDateTaskExecuter.java:64)
>  at org.gradle.api.internal.tasks.execution.ValidatingTaskExecuter.execute(ValidatingTaskExecuter.java:58)
>  at org.gradle.api.internal.tasks.execution.SkipEmptySourceFilesTaskExecuter.execute(SkipEmptySourceFilesTaskExec
>  uter.java:42)
>  at org.gradle.api.internal.tasks.execution.SkipTaskWithNoActionsExecuter.execute(SkipTaskWithNoActionsExecuter.j
>  ava:52)
>  at org.gradle.api.internal.tasks.execution.SkipOnlyIfTaskExecuter.execute(SkipOnlyIfTaskExecuter.java:53)
>  at org.gradle.api.internal.tasks.execution.ExecuteAtMostOnceTaskExecuter.execute(ExecuteAtMostOnceTaskExecuter.j
>  ava:43)
>  at org.gradle.api.internal.AbstractTask.executeWithoutThrowingTaskFailure(AbstractTask.java:286)
>  at org.gradle.execution.taskgraph.AbstractTaskPlanExecutor$TaskExecutorWorker.executeTask(AbstractTaskPlanExecut
>  or.java:79)
>  at org.gradle.execution.taskgraph.AbstractTaskPlanExecutor$TaskExecutorWorker.processTask(AbstractTaskPlanExecut
>  or.java:63)
>  at org.gradle.execution.taskgraph.AbstractTaskPlanExecutor$TaskExecutorWorker.run(AbstractTaskPlanExecutor.java:
>  51)
>  at org.gradle.execution.taskgraph.DefaultTaskPlanExecutor$1.run(DefaultTaskPlanExecutor.java:33)
>  at org.gradle.internal.Factories$1.create(Factories.java:22)
>  at org.gradle.cache.internal.DefaultCacheAccess.longRunningOperation(DefaultCacheAccess.java:198)
>  at org.gradle.cache.internal.DefaultCacheAccess.longRunningOperation(DefaultCacheAccess.java:266)
>  at org.gradle.cache.internal.DefaultPersistentDirectoryStore.longRunningOperation(DefaultPersistentDirectoryStor
>  e.java:135)
>  at org.gradle.api.internal.changedetection.state.DefaultTaskArtifactStateCacheAccess.longRunningOperation(Defaul
>  tTaskArtifactStateCacheAccess.java:93)
>  at org.gradle.execution.taskgraph.DefaultTaskPlanExecutor.process(DefaultTaskPlanExecutor.java:31)
>  at org.gradle.execution.taskgraph.DefaultTaskGraphExecuter.execute(DefaultTaskGraphExecuter.java:86)
>  at org.gradle.execution.SelectedTaskExecutionAction.execute(SelectedTaskExecutionAction.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$2.proceed(DefaultBuildExecuter.java:67)
>  at org.gradle.execution.DryRunBuildExecutionAction.execute(DryRunBuildExecutionAction.java:32)
>  at org.gradle.execution.DefaultBuildExecuter.execute(DefaultBuildExecuter.java:61)
>  at org.gradle.execution.DefaultBuildExecuter.execute(DefaultBuildExecuter.java:54)
>  at org.gradle.initialization.DefaultGradleLauncher.doBuildStages(DefaultGradleLauncher.java:166)
>  at org.gradle.initialization.DefaultGradleLauncher.doBuild(DefaultGradleLauncher.java:113)
>  at org.gradle.initialization.DefaultGradleLauncher.run(DefaultGradleLauncher.java:81)
>  at org.gradle.launcher.exec.InProcessBuildActionExecuter$DefaultBuildController.run(InProcessBuildActionExecuter
>  .java: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:20
>  1)
>  at org.gradle.launcher.cli.CommandLineActionFactory$ParseAndBuildAction.execute(CommandLineActionFactory.java:17
>  4)
>  at org.gradle.launcher.cli.CommandLineActionFactory$WithLogging.execute(CommandLineActionFactory.java:170)
>  at org.gradle.launcher.cli.CommandLineActionFactory$WithLogging.execute(CommandLineActionFactory.java:139)
>  at org.gradle.launcher.cli.ExceptionReportingAction.execute(ExceptionReportingAction.java:33)
>  at org.gradle.launcher.cli.ExceptionReportingAction.execute(ExceptionReportingAction.java:22)
>  at org.gradle.launcher.Main.doAction(Main.java:46)
>  at org.gradle.launcher.bootstrap.EntryPoint.run(EntryPoint.java:45)
>  at org.gradle.launcher.Main.main(Main.java:37)
>  at org.gradle.launcher.bootstrap.ProcessBootstrap.runNoExit(ProcessBootstrap.java:50)
>  at org.gradle.launcher.bootstrap.ProcessBootstrap.run(ProcessBootstrap.java:32)
>  at org.gradle.launcher.GradleMain.main(GradleMain.java:23)
>  at org.gradle.wrapper.BootstrapMainStarter.start(BootstrapMainStarter.java:30)
>  at org.gradle.wrapper.WrapperExecutor.execute(WrapperExecutor.java:127)
>  at org.gradle.wrapper.GradleWrapperMain.main(GradleWrapperMain.java:58)
>  Caused by: java.lang.IllegalArgumentException: MALFORMED
>  at org.springframework.boot.loader.tools.MainClassFinder.getClassEntries(MainClassFinder.java:237)
>  at org.springframework.boot.loader.tools.MainClassFinder.doWithMainClasses(MainClassFinder.java:200)
>  at org.springframework.boot.loader.tools.MainClassFinder.findSingleMainClass(MainClassFinder.java:187)
>  at org.springframework.boot.loader.tools.Repackager.findMainMethod(Repackager.java:228)
>  at org.springframework.boot.gradle.repackage.RepackageTask$LoggingRepackager.findMainMethod(RepackageTask.java:2
>  19)
>  at org.springframework.boot.loader.tools.Repackager.buildManifest(Repackager.java:206)
>  at org.springframework.boot.loader.tools.Repackager.repackage(Repackager.java:139)
>  at org.springframework.boot.loader.tools.Repackager.repackage(Repackager.java:122)
>  at org.springframework.boot.gradle.repackage.RepackageTask$RepackageAction.repackage(RepackageTask.java:173)
>  at org.springframework.boot.gradle.repackage.RepackageTask$RepackageAction.execute(RepackageTask.java:138)
>  at org.springframework.boot.gradle.repackage.RepackageTask$RepackageAction.execute(RepackageTask.java:1)
>  at org.gradle.api.internal.Actions$FilteredAction.execute(Actions.java:203)
>  at org.gradle.api.internal.DefaultDomainObjectCollection.all(DefaultDomainObjectCollection.java:110)
>  at org.gradle.api.internal.DefaultDomainObjectCollection.withType(DefaultDomainObjectCollection.java:120)
>  at org.springframework.boot.gradle.repackage.RepackageTask.repackage(RepackageTask.java:89)
>  at org.gradle.internal.reflect.JavaMethod.invoke(JavaMethod.java:63)
>  at org.gradle.api.internal.project.taskfactory.AnnotationProcessingTaskFactory$StandardTaskAction.doExecute(Anno
>  tationProcessingTaskFactory.java:219)
>  at org.gradle.api.internal.project.taskfactory.AnnotationProcessingTaskFactory$StandardTaskAction.execute(Annota
>  tionProcessingTaskFactory.java:212)
>  at org.gradle.api.internal.project.taskfactory.AnnotationProcessingTaskFactory$StandardTaskAction.execute(Annota
>  tionProcessingTaskFactory.java:201)
>  at org.gradle.api.internal.AbstractTask$TaskActionWrapper.execute(AbstractTask.java:530)
>  at org.gradle.api.internal.AbstractTask$TaskActionWrapper.execute(AbstractTask.java:513)
>  at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.executeAction(ExecuteActionsTaskExecuter.j
>  ava:80)
>  at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.executeActions(ExecuteActionsTaskExecuter.
>  java:61)
>  ... 52 more  
> 
>  BUILD FAILED  
> 
>  Total time: 13.0 secs
> 
> 
>