fix:

seecoder-gitlab-server/src/main/java/com/nju/edu/gitlab/service/impl/ProjectServiceImpl.java

@@ -359,7 +359,7 @@ public class ProjectServiceImpl implements ProjectService {
     @Override
     public VisibilityVO getProjectVisibility(Integer projectId) throws GitLabApiException {
         ProjectApi projectApi = gitlabApi.getProjectApi();
-        Project project = projectApi.getProject(projectId);
+        Project project = projectApi.getProject((long)projectId);
         return new VisibilityVO(projectId, project.getVisibility().toString());
     }