apollo-portal/src/main/java/com/ctrip/framework/apollo/portal/entity/vo/NamespaceEnvRolesAssignedUsers.java/NamespaceEnvRolesAssignedUsers/setEnv
class NamespaceEnvRolesAssignedUsers:    public void setEnv(Env env) {
        this.env = env.toString();
    }