Thymeleaf 在 Docker 容器内运行时无法解析模板

Question

我有一个 SpringBoot 应用程序的标准项目结构：

当我像这样构建并运行我的应用程序时：

mvn clean install
mvn spring-boot:run

一切正常。

当我尝试在 docker-compose 指定的 docker 容器内运行时

file:
version: "3.1"
services:
  app:
    container_name: thdnes-app
    restart: always
    build:
      context: ./
      dockerfile: Dockerfile
    ports:
      - "8080:8080"

和 Dockerfile：

FROM openjdk:11-jdk
VOLUME /tmp
COPY /target/thdnes-0.0.1-SNAPSHOT.jar app.jar
ENTRYPOINT ["java","-Djava.security.egd=file:/dev/./urandom","-jar","app.jar"]

SpringBoot 启动正常（通过控制台输出判断，没有错误）。

但是当我导航到http://localhost:8080/login 时出现错误：

thdnes-app | 2019-07-26 13:32:11.361 ERROR 1 --- [nio-8080-exec-1] org.thymeleaf.TemplateEngine             : [THYMELEAF][http-nio-8080-exec-1] Exception processing template "/login.html": Error resolving template [/login.html], template might not exist or might not be accessible by any of the configured Template Resolvers
thdnes-app | 
thdnes-app | org.thymeleaf.exceptions.TemplateInputException: Error resolving template [/login.html], template might not exist or might not be accessible by any of the configured Template Resolvers
thdnes-app |    at org.thymeleaf.engine.TemplateManager.resolveTemplate(TemplateManager.java:869) ~[thymeleaf-3.0.11.RELEASE.jar!/:3.0.11.RELEASE]
thdnes-app |    at org.thymeleaf.engine.TemplateManager.parseAndProcess(TemplateManager.java:607) ~[thymeleaf-3.0.11.RELEASE.jar!/:3.0.11.RELEASE]
thdnes-app |    at org.thymeleaf.TemplateEngine.process(TemplateEngine.java:1098) ~[thymeleaf-3.0.11.RELEASE.jar!/:3.0.11.RELEASE]
thdnes-app |    at org.thymeleaf.TemplateEngine.process(TemplateEngine.java:1072) ~[thymeleaf-3.0.11.RELEASE.jar!/:3.0.11.RELEASE]
thdnes-app |    at org.thymeleaf.spring5.view.ThymeleafView.renderFragment(ThymeleafView.java:362) ~[thymeleaf-spring5-3.0.11.RELEASE.jar!/:3.0.11.RELEASE]
thdnes-app |    at org.thymeleaf.spring5.view.ThymeleafView.render(ThymeleafView.java:189) ~[thymeleaf-spring5-3.0.11.RELEASE.jar!/:3.0.11.RELEASE]
thdnes-app |    at org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1370) ~[spring-webmvc-5.1.6.RELEASE.jar!/:5.1.6.RELEASE]
thdnes-app |    at org.springframework.web.servlet.DispatcherServlet.processDispatchResult(DispatcherServlet.java:1116) ~[spring-webmvc-5.1.6.RELEASE.jar!/:5.1.6.RELEASE]
thdnes-app |    at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1055) ~[spring-webmvc-5.1.6.RELEASE.jar!/:5.1.6.RELEASE]
thdnes-app |    at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:942) ~[spring-webmvc-5.1.6.RELEASE.jar!/:5.1.6.RELEASE]
thdnes-app |    at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1005) ~[spring-webmvc-5.1.6.RELEASE.jar!/:5.1.6.RELEASE]
thdnes-app |    at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:897) ~[spring-webmvc-5.1.6.RELEASE.jar!/:5.1.6.RELEASE]
thdnes-app |    at javax.servlet.http.HttpServlet.service(HttpServlet.java:634) ~[tomcat-embed-core-9.0.17.jar!/:9.0.17]
thdnes-app |    at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:882) ~[spring-webmvc-5.1.6.RELEASE.jar!/:5.1.6.RELEASE]
thdnes-app |    at javax.servlet.http.HttpServlet.service(HttpServlet.java:741) ~[tomcat-embed-core-9.0.17.jar!/:9.0.17]
...

在不涉及 Docker 的情况下进行测试时，模板存在并打包在 jar 中，但为什么它在容器内失败是我的问题。

Answer 1

当通过 Maven 在本地启动时，我遇到了同样的问题

mvn spring-boot:run

一切都工作正常，但是当我从 docker 容器运行它时，thymeleaf 找不到模板。

/解决方案是从视图名称的开头删除，如下例所示：

前

    public String findOwners(Model model) {
        model.addAttribute("owner", new Owner());
        return "/owners/findOwners";
    }

后

    public String findOwners(Model model) {
        model.addAttribute("owner", new Owner());
        return "owners/findOwners";
    }