gradle Cannot set the value of read-only property ‘classDirectories‘ for task *

报错背景：gradle编译时
报错提示：Cannot set the value of read-only property ‘classDirectories’ for task ‘…’ of type org.gradle.testing.jacoco.tasks.JacocoReport

原因：
gradle的classDirectories属性在5.6之后的版本里已经废弃掉了，classDirectories 由classDirectories.from替代了，

具体可见：gradle的关于classDirectories废弃的文档：
https://docs.gradle.org/current/userguide/upgrading_version_5.html#other_deprecated_behaviors_and_apis