电子剪辑：java.lang.ClassNotFoundException：org.apache.commons.dbutils.DbUtils

Question

我在我的 eClipse 根目录中创建了一个文件夹 jars，并在 jars 的子文件夹中放置了相关的 jar。我还通过 Add External Jars 在 Java Build Path 中添加了类路径 [![在此处输入图片描述][1]][1]

commons-dbutils-1.7.jar是显示

的jar

java.lang.ClassNotFoundException: org.apache.commons.dbutils.DbUtils

eClipse 未显示任何代码错误，但 eClipse Tomcat-9 在运行时显示此错误并且代码不是运行显示以下内容：

HTTP Status 500 ? Internal Server Error
Type Exception Report

Message Servlet execution threw an exception

Description The server encountered an unexpected condition that prevented it from fulfilling the request.

Exception

javax.servlet.ServletException: Servlet execution threw an exception
    org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
Root Cause

java.lang.NoClassDefFoundError: org/apache/commons/dbutils/DbUtils

user.taxonomy.categories.DAO.selectAll(DAO.java:107)
    user.taxonomy.categories.view.HTML.selectAll(HTML.java:29)
    user.taxonomy.categories.SelectAll.doGet(SelectAll.java:64)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:626)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:733)
    org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
    Note The full stack trace of the root cause is available in the server logs.

请告诉我哪里出错了？

最好的问候 [1]: https://i.stack.imgur.com/aaarw.png

Answer 1

您的 JAR 应该在 WEB-INF/lib 中，以便 Tomcat 自动加载它们。

见

What's the correct procedure to add JARs into WEB-INF/lib directory in IntelliJ

电子剪辑：java.lang.ClassNotFoundException：org.apache.commons.dbutils.DbUtils

eClipse: java.lang.ClassNotFoundException: org.apache.commons.dbutils.DbUtils

java

eclipse

classnotfoundexception

tomcat9

http-status-code-500