idea无报错但显示空白页面是什么原因？
####idea2018.3 自带的tomcat JDK1.8
引入的eclipse maven项目 编译和启动都成功了 没有报错
然后进入localhost8080端口 显示空白页面 控制台报了如下信息：
2019-07-26 14:31:41.420 [http-nio-8080-exec-1] INFO o.a.c.core.ContainerBase.[Tomcat].[localhost].[/] - Initializing Spring FrameworkServlet 'dispatcherServlet'
2019-07-26 14:31:41.420 [http-nio-8080-exec-1] INFO org.springframework.web.servlet.DispatcherServlet - FrameworkServlet 'dispatcherServlet': initialization started
2019-07-26 14:31:41.453 [http-nio-8080-exec-1] INFO org.springframework.web.servlet.DispatcherServlet - FrameworkServlet 'dispatcherServlet': initialization completed in 33 ms
2019-07-26 14:31:41.503 [http-nio-8080-exec-1] ERROR o.springframework.boot.web.support.ErrorPageFilter - Cannot forward to error page for request [/] as the response has already been committed. As a result, the response may have the wrong status code. If your application is running on WebSphere Application Server you may be able to resolve this problem by setting com.ibm.ws.webcontainer.invokeFlushAfterService to false
直接在网址输入http://localhost:8080/login 报如下：
2019-07-26 15:13:28.972 [http-nio-8080-exec-9] WARN o.s.w.s.m.m.a.ExceptionHandlerExceptionResolver - Resolved exception caused by Handler execution: com.coin.manager.interceptor.UserSessionException: 页面已失效,请重新登录
2019-07-26 15:13:28.978 [http-nio-8080-exec-9] WARN o.s.w.s.m.m.a.ExceptionHandlerExceptionResolver - Resolved exception caused by Handler execution: com.coin.manager.interceptor.UserSessionException: 页面已失效,请重新登录
2019-07-26 15:13:32.408 [http-nio-8080-exec-10] WARN o.s.w.s.m.m.a.ExceptionHandlerExceptionResolver - Resolved exception caused by Handler execution: org.springframework.web.HttpRequestMethodNotSupportedException: Request method 'GET' not supported
2019-07-26 15:13:32.410 [http-nio-8080-exec-10] ERROR o.springframework.boot.web.support.ErrorPageFilter - Cannot forward to error page for request [/login] as the response has already been committed. As a result, the response may have the wrong status code. If your application is running on WebSphere Application Server you may be able to resolve this problem by setting com.ibm.ws.webcontainer.invokeFlushAfterService to false
####**不知道是什么原因，是tomcat的问题吗？还是拦截器的原因？可是这个是从svn拉下来的，同事的eclipse完美运行**
# 页面默认前缀目录
spring.mvc.view.prefix=/WEB-INF/page/
# 响应页面默认后缀
spring.mvc.view.suffix=.jsp
svn获取，同事的没问题，应该就不是代码问题，应该是配置问题。
建议，删除项目，重新从svn获取。然后配置。
选择对应项目的jdk版本，注意idea输出文件的位置，和eclipse有区别。maven第一次下载过，第二次应该很快，
然后一步一步配置，然后Artifatcs 。然后配置tomcat。
然后注意几个地方：
建议还是用自己的tomcat，我遇到很多坑，就是这个问题。弄了几天。有时候还会昨天完美运行，今天就挂了。
HttpRequestMethodNotSupportedException: Request method 'GET' not supported
项目的login发起的请求为'GET' 而你后台对应的login方法请求估计是POST从而请求不到后台的login方法导致报错
项目的login发起的请求'GET'改为POST即可
https://blog.csdn.net/qq_33551131/article/details/80485105
和你的问题一毛一样