servlet报错“严重: Allocate exception for servlet 类名java.lang.ClassNotFoundException: 路径. 类名”可能原因...

最新推荐文章于 2023-08-03 10:42:35 发布
转载 最新推荐文章于 2023-08-03 10:42:35 发布 · 2.5k 阅读 · 0 ·
CC 4.0 BY-SA版权
原文链接：http://www.cnblogs.com/JICG/p/11507057.html
文章标签：

#java #开发工具

本文详细解析了在WEB-INF下web.xml文件中<servlet-class>路径配置错误的问题,并提供了正确的配置方法。同时，针对Libraries中servlet jar包缺失的情况，给出了具体的解决方案，包括移除和重新加载jar包的步骤。

1、WEB-INF下web.xml中<servlet-class>路径错误，正确路径为

<servlet-class>包名.类名</servlet-class>

2、Libraries中没有servlet的jar包

若为missing，则remove后重启eclipse，下次启动会载入最新jar

若缺少jar包，则add

转载于:https://www.cnblogs.com/JICG/p/11507057.html

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C:\Users\86180\.jdks\openjdk-24.0.1\bin\java.exe -Dmaven.multiModuleProjectDirectory=C:\Users\86180\IdeaProjects\javafx -Djansi.passthrough=true -Dmaven.home=C:\Users\86180\.m2\wrapper\dists\apache-maven-3.8.5-bin\5i5jha092a3i37g0paqnfr15e0\apache-maven-3.8.5 -Dclassworlds.conf=C:\Users\86180\.m2\wrapper\dists\apache-maven-3.8.5-bin\5i5jha092a3i37g0paqnfr15e0\apache-maven-3.8.5\bin\m2.conf "-Dmaven.ext.class.path=C:\Users\86180\AppData\Local\Programs\IntelliJ IDEA Ultimate 2025.1.2\plugins\maven\lib\maven-event-listener.jar" "-javaagent:C:\Users\86180\AppData\Local\Programs\IntelliJ IDEA Ultimate 2025.1.2\lib\idea_rt.jar=62746" -Dfile.encoding=UTF-8 -Dsun.stdout.encoding=UTF-8 -Dsun.stderr.encoding=UTF-8 -classpath C:\Users\86180\.m2\wrapper\dists\apache-maven-3.8.5-bin\5i5jha092a3i37g0paqnfr15e0\apache-maven-3.8.5\boot\plexus-classworlds-2.6.0.jar;C:\Users\86180\.m2\wrapper\dists\apache-maven-3.8.5-bin\5i5jha092a3i37g0paqnfr15e0\apache-maven-3.8.5\boot\plexus-classworlds.license org.codehaus.classworlds.Launcher -Didea.version=2025.1.2 clean javafx:run WARNING: A restricted method in java.lang.System has been called WARNING: java.lang.System::load has been called by org.fusesource.jansi.internal.JansiLoader in an unnamed module (file:/C:/Users/86180/.m2/wrapper/dists/apache-maven-3.8.5-bin/5i5jha092a3i37g0paqnfr15e0/apache-maven-3.8.5/lib/jansi-2.4.0.jar) WARNING: Use --enable-native-access=ALL-UNNAMED to avoid a warning for callers in this module WARNING: Restricted methods will be blocked in a future release unless native access is enabled WARNING: A terminally deprecated method in sun.misc.Unsafe has been called WARNING: sun.misc.Unsafe::objectFieldOffset has been called by com.google.common.util.concurrent.AbstractFuture$UnsafeAtomicHelper (file:/C:/Users/86180/.m2/wrapper/dists/apache-maven-3.8.5-bin/5i5jha092a3i37g0paqnfr15e0/apache-maven-3.8.5/lib/guava-25.1-android.jar) WARNING: Please consider reporting this to the maintainers of class com.google.common.util.concurrent.AbstractFuture$UnsafeAtomicHelper WARNING: sun.misc.Unsafe::objectFieldOffset will be removed in a future release [INFO] Scanning for projects... [INFO] [INFO] ---------------------< com.example:javafx-project >--------------------- [INFO] Building JavaFX 停车场管理系统 1.0-SNAPSHOT [INFO] --------------------------------[ jar ]--------------------------------- [INFO] [INFO] --- maven-clean-plugin:2.5:clean (default-clean) @ javafx-project --- [INFO] Deleting C:\Users\86180\IdeaProjects\javafx\target [INFO] [INFO] >>> javafx-maven-plugin:0.0.8:run (default-cli) > process-classes @ javafx-project >>> [INFO] [INFO] --- maven-resources-plugin:2.6:resources (default-resources) @ javafx-project --- [INFO] Using 'UTF-8' encoding to copy filtered resources. [INFO] Copying 6 resources [INFO] [INFO] --- maven-compiler-plugin:3.13.0:compile (default-compile) @ javafx-project --- [INFO] Recompiling the module because of changed source code. [INFO] Compiling 11 source files with javac [debug release 24 module-path] to target\classes [INFO] [INFO] <<< javafx-maven-plugin:0.0.8:run (default-cli) < process-classes @ javafx-project <<< [INFO] [INFO] [INFO] --- javafx-maven-plugin:0.0.8:run (default-cli) @ javafx-project --- [WARNING] Module name not found in <mainClass>. Module name will be assumed from module-info.java 6�� 15, 2025 5:27:58 ���� dao.VehicleDAO <init> ����: δ�ҵ�MySQL JDBC��������ȷ����������� java.lang.ClassNotFoundException: com.mysql.cj.jdbc.Driver at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:580) at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:490) at java.base/java.lang.Class.forName0(Native Method) at java.base/java.lang.Class.forName(Class.java:463) at java.base/java.lang.Class.forName(Class.java:454) at javafx@1.0-SNAPSHOT/dao.VehicleDAO.<init>(VehicleDAO.java:33) at javafx@1.0-SNAPSHOT/service.ParkingService.<init>(ParkingService.java:17) at javafx@1.0-SNAPSHOT/view.controller.MainController.initialize(MainController.java:47) at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:104) at java.base/java.lang.reflect.Method.invoke(Method.java:565) at com.sun.javafx.reflect.Trampoline.invoke(MethodUtil.java:65) at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:104) at java.base/java.lang.reflect.Method.invoke(Method.java:565) at javafx.base@24/com.sun.javafx.reflect.MethodUtil.invoke(MethodUtil.java:112) at javafx.fxml@24/com.sun.javafx.fxml.MethodHelper.invoke(MethodHelper.java:78) at javafx.fxml@24/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2658) at javafx.fxml@24/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2533) at javafx.fxml@24/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3304) at javafx.fxml@24/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3264) at javafx.fxml@24/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3235) at javafx.fxml@24/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3211) at javafx.fxml@24/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3191) at javafx.fxml@24/javafx.fxml.FXMLLoader.load(FXMLLoader.java:3186) at javafx@1.0-SNAPSHOT/view.Main.start(Main.java:16) at javafx.graphics@24/com.sun.javafx.application.LauncherImpl.lambda$launchApplication1$7(LauncherImpl.java:840) at javafx.graphics@24/com.sun.javafx.application.PlatformImpl.lambda$runAndWait$5(PlatformImpl.java:444) at javafx.graphics@24/com.sun.javafx.application.PlatformImpl.lambda$runLater$4(PlatformImpl.java:419) at javafx.graphics@24/com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:95) at javafx.graphics@24/com.sun.glass.ui.win.WinApplication._runLoop(Native Method) at javafx.graphics@24/com.sun.glass.ui.win.WinApplication.lambda$runLoop$0(WinApplication.java:168) at java.base/java.lang.Thread.run(Thread.java:1447) 6�� 15, 2025 5:27:58 ���� dao.VehicleDAO getConnection ��Ϣ: �������ӵ�MySQL���ݿ�: jdbc:mysql://localhost:3306/parking_system?useUnicode=true&characterEncoding=UTF-8&useSSL=false&serverTimezone=Asia/Shanghai 6�� 15, 2025 5:27:58 ���� dao.VehicleDAO getConnection ����: MySQL���ݿ�����ʧ�� java.sql.SQLException: No suitable driver found for jdbc:mysql://localhost:3306/parking_system?useUnicode=true&characterEncoding=UTF-8&useSSL=false&serverTimezone=Asia/Shanghai at java.sql/java.sql.DriverManager.getConnection(DriverManager.java:638) at java.sql/java.sql.DriverManager.getConnection(DriverManager.java:199) at javafx@1.0-SNAPSHOT/dao.VehicleDAO.getConnection(VehicleDAO.java:45) at javafx@1.0-SNAPSHOT/dao.VehicleDAO.selectAllVehicles(VehicleDAO.java:122) at javafx@1.0-SNAPSHOT/service.ParkingService.getAllVehicles(ParkingService.java:76) at javafx@1.0-SNAPSHOT/view.controller.MainController.loadVehicleData(MainController.java:100) at javafx@1.0-SNAPSHOT/view.controller.MainController.initialize(MainController.java:92) at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:104) at java.base/java.lang.reflect.Method.invoke(Method.java:565) at com.sun.javafx.reflect.Trampoline.invoke(MethodUtil.java:65) at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:104) at java.base/java.lang.reflect.Method.invoke(Method.java:565) at javafx.base@24/com.sun.javafx.reflect.MethodUtil.invoke(MethodUtil.java:112) at javafx.fxml@24/com.sun.javafx.fxml.MethodHelper.invoke(MethodHelper.java:78) at javafx.fxml@24/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2658) at javafx.fxml@24/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2533) at javafx.fxml@24/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3304) at javafx.fxml@24/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3264) at javafx.fxml@24/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3235) at javafx.fxml@24/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3211) at javafx.fxml@24/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3191) at javafx.fxml@24/javafx.fxml.FXMLLoader.load(FXMLLoader.java:3186) at javafx@1.0-SNAPSHOT/view.Main.start(Main.java:16) at javafx.graphics@24/com.sun.javafx.application.LauncherImpl.lambda$launchApplication1$7(LauncherImpl.java:840) at javafx.graphics@24/com.sun.javafx.application.PlatformImpl.lambda$runAndWait$5(PlatformImpl.java:444) at javafx.graphics@24/com.sun.javafx.application.PlatformImpl.lambda$runLater$4(PlatformImpl.java:419) at javafx.graphics@24/com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:95) at javafx.graphics@24/com.sun.glass.ui.win.WinApplication._runLoop(Native Method) at javafx.graphics@24/com.sun.glass.ui.win.WinApplication.lambda$runLoop$0(WinApplication.java:168) at java.base/java.lang.Thread.run(Thread.java:1447) 6�� 15, 2025 5:27:58 ���� dao.VehicleDAO getConnection ����: �������: 0 6�� 15, 2025 5:27:58 ���� dao.VehicleDAO getConnection ����: SQL״̬: 08001 6�� 15, 2025 5:27:58 ���� dao.VehicleDAO getConnection ����: ������Ϣ: No suitable driver found for jdbc:mysql://localhost:3306/parking_system?useUnicode=true&characterEncoding=UTF-8&useSSL=false&serverTimezone=Asia/Shanghai WARNING: A terminally deprecated method in sun.misc.Unsafe has been called WARNING: sun.misc.Unsafe::allocateMemory has been called by com.sun.marlin.OffHeapArray (file:/C:/Users/86180/.m2/repository/org/openjfx/javafx-graphics/24/javafx-graphics-24-win.jar) WARNING: Please consider reporting this to the maintainers of class com.sun.marlin.OffHeapArray WARNING: sun.misc.Unsafe::allocateMemory will be removed in a future release java.lang.NullPointerException: Cannot invoke "java.sql.Connection.prepareStatement(String)" because "connection" is null at javafx@1.0-SNAPSHOT/dao.VehicleDAO.selectAllVehicles(VehicleDAO.java:123) at javafx@1.0-SNAPSHOT/service.ParkingService.getAllVehicles(ParkingService.java:76) at javafx@1.0-SNAPSHOT/view.controller.MainController.loadVehicleData(MainController.java:100) at javafx@1.0-SNAPSHOT/view.controller.MainController.initialize(MainController.java:92) at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:104) at java.base/java.lang.reflect.Method.invoke(Method.java:565) at com.sun.javafx.reflect.Trampoline.invoke(MethodUtil.java:65) at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:104) at java.base/java.lang.reflect.Method.invoke(Method.java:565) at javafx.base@24/com.sun.javafx.reflect.MethodUtil.invoke(MethodUtil.java:112) at javafx.fxml@24/com.sun.javafx.fxml.MethodHelper.invoke(MethodHelper.java:78) at javafx.fxml@24/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2658) at javafx.fxml@24/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2533) at javafx.fxml@24/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3304) at javafx.fxml@24/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3264) at javafx.fxml@24/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3235) at javafx.fxml@24/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3211) at javafx.fxml@24/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3191) at javafx.fxml@24/javafx.fxml.FXMLLoader.load(FXMLLoader.java:3186) at javafx@1.0-SNAPSHOT/view.Main.start(Main.java:16) at javafx.graphics@24/com.sun.javafx.application.LauncherImpl.lambda$launchApplication1$7(LauncherImpl.java:840) at javafx.graphics@24/com.sun.javafx.application.PlatformImpl.lambda$runAndWait$5(PlatformImpl.java:444) at javafx.graphics@24/com.sun.javafx.application.PlatformImpl.lambda$runLater$4(PlatformImpl.java:419) at javafx.graphics@24/com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:95) at javafx.graphics@24/com.sun.glass.ui.win.WinApplication._runLoop(Native Method) at javafx.graphics@24/com.sun.glass.ui.win.WinApplication.lambda$runLoop$0(WinApplication.java:168) at java.base/java.lang.Thread.run(Thread.java:1447) 6�� 15, 2025 5:28:02 ���� dao.VehicleDAO getConnection ��Ϣ: �������ӵ�MySQL���ݿ�: jdbc:mysql://localhost:3306/parking_system?useUnicode=true&characterEncoding=UTF-8&useSSL=false&serverTimezone=Asia/Shanghai 6�� 15, 2025 5:28:02 ���� dao.VehicleDAO getConnection ����: MySQL���ݿ�����ʧ�� java.sql.SQLException: No suitable driver found for jdbc:mysql://localhost:3306/parking_system?useUnicode=true&characterEncoding=UTF-8&useSSL=false&serverTimezone=Asia/Shanghai at java.sql/java.sql.DriverManager.getConnection(DriverManager.java:638) at java.sql/java.sql.DriverManager.getConnection(DriverManager.java:199) at javafx@1.0-SNAPSHOT/dao.VehicleDAO.getConnection(VehicleDAO.java:45) at javafx@1.0-SNAPSHOT/dao.VehicleDAO.selectAllVehicles(VehicleDAO.java:122) at javafx@1.0-SNAPSHOT/service.ParkingService.getAllVehicles(ParkingService.java:76) at javafx@1.0-SNAPSHOT/service.ParkingService.getVehicleCount(ParkingService.java:111) at javafx@1.0-SNAPSHOT/view.controller.MainController.updateStatistics(MainController.java:112) at javafx@1.0-SNAPSHOT/view.controller.MainController.initialize(MainController.java:93) at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:104) at java.base/java.lang.reflect.Method.invoke(Method.java:565) at com.sun.javafx.reflect.Trampoline.invoke(MethodUtil.java:65) at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:104) at java.base/java.lang.reflect.Method.invoke(Method.java:565) at javafx.base@24/com.sun.javafx.reflect.MethodUtil.invoke(MethodUtil.java:112) at javafx.fxml@24/com.sun.javafx.fxml.MethodHelper.invoke(MethodHelper.java:78) at javafx.fxml@24/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2658) at javafx.fxml@24/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2533) at javafx.fxml@24/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3304) at javafx.fxml@24/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3264) at javafx.fxml@24/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3235) at javafx.fxml@24/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3211) at javafx.fxml@24/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3191) at javafx.fxml@24/javafx.fxml.FXMLLoader.load(FXMLLoader.java:3186) at javafx@1.0-SNAPSHOT/view.Main.start(Main.java:16) at javafx.graphics@24/com.sun.javafx.application.LauncherImpl.lambda$launchApplication1$7(LauncherImpl.java:840) at javafx.graphics@24/com.sun.javafx.application.PlatformImpl.lambda$runAndWait$5(PlatformImpl.java:444) at javafx.graphics@24/com.sun.javafx.application.PlatformImpl.lambda$runLater$4(PlatformImpl.java:419) at javafx.graphics@24/com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:95) at javafx.graphics@24/com.sun.glass.ui.win.WinApplication._runLoop(Native Method) at javafx.graphics@24/com.sun.glass.ui.win.WinApplication.lambda$runLoop$0(WinApplication.java:168) at java.base/java.lang.Thread.run(Thread.java:1447) 6�� 15, 2025 5:28:02 ���� dao.VehicleDAO getConnection ����: �������: 0 6�� 15, 2025 5:28:02 ���� dao.VehicleDAO getConnection ����: SQL״̬: 08001 6�� 15, 2025 5:28:02 ���� dao.VehicleDAO getConnection ����: ������Ϣ: No suitable driver found for jdbc:mysql://localhost:3306/parking_system?useUnicode=true&characterEncoding=UTF-8&useSSL=false&serverTimezone=Asia/Shanghai java.lang.NullPointerException: Cannot invoke "java.sql.Connection.prepareStatement(String)" because "connection" is null at javafx@1.0-SNAPSHOT/dao.VehicleDAO.selectAllVehicles(VehicleDAO.java:123) at javafx@1.0-SNAPSHOT/service.ParkingService.getAllVehicles(ParkingService.java:76) at javafx@1.0-SNAPSHOT/service.ParkingService.getVehicleCount(ParkingService.java:111) at javafx@1.0-SNAPSHOT/view.controller.MainController.updateStatistics(MainController.java:112) at javafx@1.0-SNAPSHOT/view.controller.MainController.initialize(MainController.java:93) at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:104) at java.base/java.lang.reflect.Method.invoke(Method.java:565) at com.sun.javafx.reflect.Trampoline.invoke(MethodUtil.java:65) at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:104) at java.base/java.lang.reflect.Method.invoke(Method.java:565) at javafx.base@24/com.sun.javafx.reflect.MethodUtil.invoke(MethodUtil.java:112) at javafx.fxml@24/com.sun.javafx.fxml.MethodHelper.invoke(MethodHelper.java:78) at javafx.fxml@24/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2658) at javafx.fxml@24/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2533) at javafx.fxml@24/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3304) at javafx.fxml@24/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3264) at javafx.fxml@24/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3235) at javafx.fxml@24/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3211) at javafx.fxml@24/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3191) at javafx.fxml@24/javafx.fxml.FXMLLoader.load(FXMLLoader.java:3186) at javafx@1.0-SNAPSHOT/view.Main.start(Main.java:16) at javafx.graphics@24/com.sun.javafx.application.LauncherImpl.lambda$launchApplication1$7(LauncherImpl.java:840) at javafx.graphics@24/com.sun.javafx.application.PlatformImpl.lambda$runAndWait$5(PlatformImpl.java:444) at javafx.graphics@24/com.sun.javafx.application.PlatformImpl.lambda$runLater$4(PlatformImpl.java:419) at javafx.graphics@24/com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:95) at javafx.graphics@24/com.sun.glass.ui.win.WinApplication._runLoop(Native Method) at javafx.graphics@24/com.sun.glass.ui.win.WinApplication.lambda$runLoop$0(WinApplication.java:168) at java.base/java.lang.Thread.run(Thread.java:1447) [INFO] ------------------------------------------------------------------------ [INFO] BUILD SUCCESS [INFO] ------------------------------------------------------------------------ [INFO] Total time: 13.126 s [INFO] Finished at: 2025-06-15T17:28:06+08:00 [INFO] ------------------------------------------------------------------------ 进程已结束，退出代码为 0
06-16
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