Spring启动JSP错误：NoClassDefFoundError [英] Spring boot JSP error: NoClassDefFoundError
问题描述
每当我尝试运行配置了JSP的spring boot app时，我都会收到此错误：
Everytime I try to run spring boot app configured with JSP I get this error:
java.lang.NoClassDefFoundError: javax/servlet/ServletContext
at java.lang.Class.getDeclaredMethods0(Native Method)
at java.lang.Class.privateGetDeclaredMethods(Class.java:2701)
at java.lang.Class.getDeclaredMethods(Class.java:1975)
.............
[more errors/exceptions]
.............
Exception in thread "main" java.lang.NoClassDefFoundError: javax/servlet/ServletContext
at java.lang.Class.getDeclaredMethods0(Native Method)
at java.lang.Class.privateGetDeclaredMethods(Class.java:2701)
at java.lang.Class.getDeclaredMethods(Class.java:1975)
我试图运行样本： spring-boot-sample-web-jsp 和 spring-boot-sample-web-jsp
这些样本的结果相同。我使用IntelliJ IDEA运行应用程序并且没有IDEA为什么它不起作用。
The result is the same for those samples. I run application using IntelliJ IDEA and have no IDEA why it does not work.
推荐答案
有一个 IntelliJ中的错误表示提供的依赖项未添加到类路径中。假设你想坚持使用IDEA，你有几个选择：
There's a bug in IntelliJ that means that provided dependencies aren't added to the classpath. Assuming you want to stick with IDEA, you have a few options:
- 在IDEA中手动配置类路径
- 使用
命令行运行示例mvn spring-boot：run - 删除所有出现的
< scope>从pom提供< / scope>。这意味着应用程序无法部署为对Tomcat或类似的战争
- Manually configure the classpath in IDEA
- Run the samples on the command line using
mvn spring-boot:run - Remove all occurrences of
<scope>provided</scope>from the pom. This will mean that app can't be deployed as a war to Tomcat or similar
编辑：错误已修复且服务器将只要在 classpath 下面的运行配置中勾选 包含提供范围 的依赖项复选框，就可以正常启动strong>。
The bug is fixed and the server will start normally, as long as you tick the Include dependencies with "Provided" scope checkbox in the run configuration, below classpath.
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