我的maven配置 <dependency> <groupId>org.apache.logging.log4j</groupId> <artifactId>log4j-web</artifactId> <version>2.8.1</version> <scope>compile</scope> </dependency> <dependency> <groupId>org.apache.logging.log4j</groupId> <artifactId>log4j-api</artifactId> <version>2.8.1</version> <scope>compile</scope> </dependency> <dependency> <groupId>org.apache.logging.log4j</groupId> <artifactId>log4j-core</artifactId> <version>2.8.1</version> <scope>compile</scope> </dependency> 然后我在main函數中調用一切正常 public class Test { private static final Logger LOGGER = LogManager.getLogger(Test.class); public static void main(String[] args) { LOGGER.error("cuo wu"); } } 但是在servlet中使用就會報錯 @WebServlet(urlPatterns = "/index") public class Test extends HttpServlet{ @Override protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { final Logger LOGGER = LogManager.getLogger(); LOGGER.error("aefaefe"); resp.getWriter().write("hi"); } } 錯誤信息是 java.lang.NoClassDefFoundError: org/apache/logging/log4j/LogManager 希望有經驗的大佬幫幫忙