問題描述

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

問題解答

可以在項目的發布目錄下找一下對應的class文件是否存在