Springboot實踐心得

剛入門Springboot，跟著B站小匠視頻學習，基本上照著敲，但是實踐過程中可能是因為版本的問題，在調用Request的時候出現了以下問題。
附帶B站小匠視頻原版地址:https://www.bilibili.com/video/av50200264?spm_id_from=333.788.b_765f64657363.1
調用代碼：

@GetMapping("callback")public String callBack(@RequestParam(name = "code") String code,@RequestParam(name = "state") String state,HttpServletRequest request) {GitHubProvider gitHubProvider = new GitHubProvider();gitHubDo.setState(state);gitHubDo.setCode(code);gitHubDo.setClient_id(client_id);gitHubDo.setClient_secret(client_secret);gitHubDo.setRedirect_uri("http://localhost:10086/callback");String returnMsg = gitHubProvider.accessToken(gitHubDo);System.out.println(returnMsg);String returnAccess = returnMsg.split("&")[0];System.out.println(returnAccess);String accessToken = returnAccess.split("=")[1];System.out.println(accessToken);String vs = gitHubProvider.getAccessTokenInfo(accessToken);UserDao userDao = gitHubProvider.getUser(vs);System.out.println(userDao.toString());try {request.getSession().setAttribute("githubUser", userDao);} catch (Exception e) {//如果用戶不存在request.getSession().setAttribute("githubUser", userDao);try {} catch (Exception ee) {}}return "redirect:/yhw";}

報錯提示：

org.apache.catalina.core.ContainerBase.[Tomcat].[localhost].[/] - Session event listener threw exception java.lang.AbstractMethodError: org.apache.tomcat.websocket.server.WsSessionListener.sessionCreated(Ljavax/servlet/http/HttpSessionEvent;)V at org.apache.catalina.session.StandardSession.tellNew(StandardSession.java:388) [tomcat-embed-core-9.0.22.jar:9.0.22] at org.apache.catalina.session.StandardSession.setId(StandardSession.java:360) [tomcat-embed-core-9.0.22.jar:9.0.22]

跟著提示看下去。中間過程debugger看，getSession()在沒有Session的情況下會新建Session，也就是中間這一長串，效果等同于getSession(true).但是調用接口的sessionCreated的時候報錯了，進去看到是個繼承HttpSessionListner的類，按理來說沒錯，實在找不出問題，然后面向谷歌編程。

在這個老哥那里得到問題所在:
轉自:https://blog.csdn.net/yanwenyuan0304/article/details/100514065
知道是版本的問題后

Description:An attempt was made to call a method that does not exist. The attempt was made from the following location:org.springframework.boot.web.embedded.tomcat.TomcatServletWebServerFactory.getWebServer(TomcatServletWebServerFactory.java:175)The following method did not exist:org.apache.tomcat.util.modeler.Registry.disableRegistry()VThe method's class, org.apache.tomcat.util.modeler.Registry, is available from the following locations:jar:file:/C:/Users/lukawa/.m2/repository/org/apache/tomcat/embed/tomcat-embed-core/8.5.37/tomcat-embed-core-8.5.37.jar!/org/apache/tomcat/util/modeler/Registry.classIt was loaded from the following location:file:/C:/Users/lukawa/.m2/repository/org/apache/tomcat/embed/tomcat-embed-core/8.5.37/tomcat-embed-core-8.5.37.jarAction:Correct the classpath of your application so that it contains a single, compatible version of org.apache.tomcat.util.modeler.Registry

很明顯是jar包里方法的問題，改class文件是不可能的了，然后直接從倉庫里把9.X的core.jar拿過來名字改一下就OK了，改成8.X版本的名字，有點像自家的仔放別人家養的感覺，但是最后sessionCreated不報錯了是真的！

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