Spring-cloud-netflix: Dashboard templates not found on classpath

[stovocor]

After enabling the Eureka server with @EnableEurekaServer in an existing application the dashboard can not be opened:

org.thymeleaf.exceptions.TemplateInputException: Error resolving template [eureka/status], 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-3.0.11.RELEASE.jar:3.0.11.RELEASE]
    at org.thymeleaf.engine.TemplateManager.parseAndProcess(TemplateManager.java:607) ~[thymeleaf-3.0.11.RELEASE.jar:3.0.11.RELEASE]
    at org.thymeleaf.TemplateEngine.process(TemplateEngine.java:1098) ~[thymeleaf-3.0.11.RELEASE.jar:3.0.11.RELEASE]
    at org.thymeleaf.TemplateEngine.process(TemplateEngine.java:1072) ~[thymeleaf-3.0.11.RELEASE.jar:3.0.11.RELEASE]
    at org.thymeleaf.spring5.view.ThymeleafView.renderFragment(ThymeleafView.java:362) ~[thymeleaf-spring5-3.0.11.RELEASE.jar:3.0.11.RELEASE]
    at org.thymeleaf.spring5.view.ThymeleafView.render(ThymeleafView.java:189) ~[thymeleaf-spring5-3.0.11.RELEASE.jar:3.0.11.RELEASE]
    at org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1370) ~[spring-webmvc-5.1.2.RELEASE.jar:5.1.2.RELEASE]
    at org.springframework.web.servlet.DispatcherServlet.processDispatchResult(DispatcherServlet.java:1116) ~[spring-webmvc-5.1.2.RELEASE.jar:5.1.2.RELEASE]
    at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1055) ~[spring-webmvc-5.1.2.RELEASE.jar:5.1.2.RELEASE]
    at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:942) ~[spring-webmvc-5.1.2.RELEASE.jar:5.1.2.RELEASE]
    at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:998) ~[spring-webmvc-5.1.2.RELEASE.jar:5.1.2.RELEASE]
    at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:890) ~[spring-webmvc-5.1.2.RELEASE.jar:5.1.2.RELEASE]
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:634) ~[tomcat-embed-core-9.0.12.jar:9.0.12]
    at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:875) ~[spring-webmvc-5.1.2.RELEASE.jar:5.1.2.RELEASE]
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:741) ~[tomcat-embed-core-9.0.12.jar:9.0.12]

Since Eureka uses Freemarker as its template engine, the error message is at least confusing. After debugging this case I found that the Freemarker templates can not be loaded by the ClassTemplateLoader. I am not sure what the root cause is but it seems strange that resourceLoaderClass is set and all templates are being resolved relative to this class.

As a workaround I can set the template loader manually:

spring.freemarker.template-loader-path=classpath:/templates/
spring.freemarker.prefer-file-system-access=false

I am using spring-cloud-netflix-eureka-server (2.0.2.RELEASE) and Spring Boot 2.1.0.

[spencergibb]

Looks like your existing application uses thymeleaf?

[stovocor]

Yes, that is correct.

[spencergibb]

We've never encounter that. So you're workaround is probably needed.

[stovocor]

This issue affects other users, too.

• Stack Overflow: Spring Thymeleaf Dependency Overwriting Eureka Template?
• Google Groups posting

Perhaps it is a good idea to document this workaround.

[spencergibb]

Pull requests welcome

[abelokon955]

This issue still occurs in my project, is there a valid solution to this by now?

[spencergibb]

Did you read the documentation in the above commit?

[abelokon955]

Please forgive my ignorance, the workaround did actually resolve my issue. Thank you @spencergibb and @stovocor