Question

尝试使用IntelliJ在Java中创建基本登录页面。我已使用以下指令将JAR添加到CLASSPATH：Adding Jar files to IntellijIdea classpath。我得到的错误如下。

SELECT top 100

ROW_NUMBER() OVER(ORDER BY u.Reputation DESC) AS rank, 

u.Id AS [User Link], u. Reputation, p.Body

from
      Users u
      inner join Posts p on p.OwnerUserId = u.Id 

ORDER BY
    u.Reputation DESC

连接到DB的类称为Validate;

java.lang.ClassNotFoundException: com.mysql.jdbc.Driver
at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1285)
at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1119)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:264)
at main.Validate.checkUser(Validate.java:17)
at main.Login.doPost(Login.java:23)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:661)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:742)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:230)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:192)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:198)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:478)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:140)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:80)
at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:624)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:341)
at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:783)
at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:798)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1441)
at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Thread.java:745)
20-Mar-2017 16:14:19.453 INFO [localhost-startStop-1] org.apache.catalina.startup.HostConfig.deployDirectory Deploying web application directory D:\Users\MYNAME\apache-tomcat-8.5.12\webapps\manager
20-Mar-2017 16:14:19.523 INFO [localhost-startStop-1] org.apache.catalina.startup.HostConfig.deployDirectory Deployment of web application directory D:\Users\MYNAME\apache-tomcat-8.5.12\webapps\manager has finished in 70 ms

Answer 1

向IntelliJ的类路径添加库不会将它们添加到构建工件中，例如.jar文件。如果您正在使用Maven，则应将依赖项添加到POM文件并使用 maven-assembly-plugin 创建包含所有必需依赖项的胖存档：

https://maven.apache.org/plugins/maven-assembly-plugin/usage.html

编辑：在聊天讨论后，结果发现用户试图在tomcat上部署一个简单的.jar，而他认为他正在部署一个Web存档。瘦.jar不包含所需的依赖项，而tomcat也没有提供它们作为其核心的一部分。

IntelliJ java.lang.ClassNotFoundException：com.mysql.jdbc.Driver - 连接到XAMPP MySQL数据库

1 个答案: