java - log4j2 在servlet3.1下报错NoClassDefFoundError

问题描述

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函数中调用一切正常

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中使用就会报错

@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'); }}

错误信息是

java.lang.NoClassDefFoundError: org/apache/logging/log4j/LogManager

希望有经验的大佬帮帮忙

问题解答

可以在项目的发布目录下找一下对应的class文件是否存在