使用$ ./gradlew jar命令在mongo-hadoop中构建jar时出错

Question

我使用以下参考

克隆了mongo-hadoop连接器git存储库

http://docs.mongodb.org/ecosystem/tutorial/getting-started-with-hadoop/

成功克隆后，我正在尝试使用$ ./gradlew jar构建jar，它显示以下异常，

 hduser@mypc:/mongo-hadoop$ ./gradlew jar
:compileJava
FAILURE: Build failed with an exception.

* What went wrong:
Could not create service of type TaskArtifactStateCacheAccess using    TaskExecutionServices.createCacheAccess().
> Failed to create parent directory '/mongo-hadoop/.gradle' when creating directory '/mongo-hadoop/.gradle/2.2.1/taskArtifacts'

* Try:
Run with --stacktrace option to get the stack trace. Run with --info   or --debug option to get more log output.  

建立失败

这可能是什么原因让任何人帮我解决这个问题。