Intellij Idea启动springboot报ClassNotFoundException

Intellij Idea版本为Ultimate 2016.1, gradle版本为3.5,启动springboot报错

java.lang.NoClassDefFoundError: org/springframework/boot/SpringApplication
    at com.some.fancy.name.Application.main(Application.java:13)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at com.intellij.rt.execution.application.AppMain.main(AppMain.java:147)
Caused by: java.lang.ClassNotFoundException: org.springframework.boot.SpringApplication
    at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
    ... 6 more

首先排除了各种因依赖配置错误问题，各种百思不得其解。最后google搜到，原来是个bug。

It's a known issue in IntelliJ IDEA that is specific to Gradle 3.4 and later versions:

• IDEA-167412 Gradle 3.4-rc-1 changes compile dependencies to provided
• original bug report in the Gradle project with more details
• comment from the responsible developer regarding "Create Module per source set" option and how Gradle integration works in IntelliJ IDEA

It's already fixed in IntelliJ IDEA 2017.1 and 2016.3.6.

You can also use Gradle 3.3 or older as a workaround if you can't or don't want to update IntelliJ IDEA.

原文地址：

https://stackoverflow.com/questions/42587487/noclassdeffounderror-after-intellij-idea-upgrade/42588061#42588061

解决办法，更新Intellij Idea至2016.3或者2017.1，要么使用3.3版本或者低于3.3版本的gradle。