官方原文如下：

When running a Spring Boot application that uses an embedded servlet container (and is packaged as an executable archive), there are some limitations in the JSP support.

• With Tomcat it should work if you use war packaging, i.e. an executable war will work, and will also be deployable to a standard container (not limited to, but including Tomcat). An executable jar will not work because of a hard coded file pattern in Tomcat.
• With Jetty it should work if you use war packaging, i.e. an executable war will work, and will also be deployable to any standard container.
• Undertow does not support JSPs.
• Creating a custom error.jsp page won’t override the default view for error handling, custom error pages should be used instead.

There is a JSP sample so you can see how to set things up.

https://docs.spring.io/spring-boot/docs/current/reference/htmlsingle/#boot-features-jsp-limitations