执行报错：

./gradlew build -x test --stacktrace

报错信息：

Could not find or load main class org.gradle.wrapper.GradleWrapperMain

解决：
确定目录结构是否正常

├── build.gradle
├── gradle
│   └── wrapper
│       ├── gradle-wrapper.jar
│       └── gradle-wrapper.properties
├── gradlew
├── gradlew.bat
└── settings.gradle

对比后发现缺少gradle-wrapper.jar，下载后执行成功
下载路径；

http://www.java2s.com/Code/JarDownload/gradle-wrapper/gradle-wrapper.jar.zip

参考：

https://stackoverflow.com/questions/29805622/could-not-find-or-load-main-class-org-gradle-wrapper-gradlewrappermain