问题描述

项目在idea中可以正常访问，但是达成jar包后访问时候访问异常，并报错，部分异常栈如下:

org.thymeleaf.exceptions.TemplateInputException: Error resolving template [/views/login], template might not exist or might not be accessible by any of the configured Template Resolvers
        at org.thymeleaf.engine.TemplateManager.resolveTemplate(TemplateManager.java:869) ~[thymeleaf-3.0.15.RELEASE.jar!/:3.0.15.RELEASE]
        at org.thymeleaf.engine.TemplateManager.parseAndProcess(TemplateManager.java:607) ~[thymeleaf-3.0.15.RELEASE.jar!/:3.0.15.RELEASE]
        at org.thymeleaf.TemplateEngine.process(TemplateEngine.java:1098) [thymeleaf-3.0.15.RELEASE.jar!/:3.0.15.RELEASE]
        at org.thymeleaf.TemplateEngine.process(TemplateEngine.java:1072) [thymeleaf-3.0.15.RELEASE.jar!/:3.0.15.RELEASE]
        at org.thymeleaf.spring5.view.ThymeleafView.renderFragment(ThymeleafView.java:366) [thymeleaf-spring5-3.0.15.RELEASE.jar!/:3.0.15.RELEASE]
        at org.thymeleaf.spring5.view.ThymeleafView.render(ThymeleafView.java:190) [thymeleaf-spring5-3.0.15.RELEASE.jar!/:3.0.15.RELEASE]
        at org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1406) [spring-webmvc-5.3.27.jar!/:5.3.27]
        at org.springframework.web.servlet.DispatcherServlet.processDispatchResult(DispatcherServlet.java:1150) [spring-webmvc-5.3.27.jar!/:5.3.27]
        at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1089) [spring-webmvc-5.3.27.jar!/:5.3.27]

可以看到是TemplateManager中resolveTemplate方法报错了

问题排查

因为只有打包后jar运行才报错，问了定位问题，本地启动jar时候开启一个远程debug端口5005，启动命令如下：

java -jar -agentlib:jdwp=transport=dt_socket,server=y,suspend=n,address=5005 target/pro-artifact-1.0.0.jar

IDEA添加Remote JVM Debug

定位

问题代码入口

问题节点

此处返回null导致无法加载页面，继续跟踪tempalteResource.exists方法，检查为什么返回false

exists方法检查

到此处，问题已经明了，path中多了一个斜杠。原因spring.thymleaf.prefix值为classpath:/templates/，但是配置页面以/views/开头，导致多一个/，这个在idea中没影响，但是部署jar执行的时候却无法识别。

thymleaf相关的yml配置

spring:
  thymeleaf:
    cache: false  #关闭 Thymeleaf 的缓存开发过程中无需重启
    encoding: UTF-8 #设置thymeleaf页面的编码
    mode: HTML
    #设置thymeleaf页面的后缀
    suffix: .html
    #设置thymeleaf页面的存储路径
    prefix: classpath:/templates/

页面配置

@RequestMapping("/{pageName}")
    public ModelAndView router(@PathVariable String pageName, HttpServletRequest request) {
        ModelAndView modelAndView = new ModelAndView("/views/" + pageName);
        modelAndView.addObject("ctx", request.getContextPath());
        Subject subject = SecurityUtils.getSubject();
        String loginUserName = String.valueOf(subject.getPrincipal());
        User user = new User();
        user.setUserName(loginUserName);
        modelAndView.addObject("user", user);
        return modelAndView;
    }