2 回答求解：Cannot change version of project facet Dynamic Web Module to 2.4. HelloSpringMvc line 1 Maven Java EE Configuration Problem

1 回答controller cannot be resolved to a type ?

4 回答一直都報The goal you specified requires a project to execute but there is no POM in this directory 的錯誤，求大神指教

3 回答卡在了generating project in Interactive mode

2 回答Project build error: 'dependencies.dependency.version' for org.springframework:spring-webmvc:jar is missing.