Exception in thread "main" java.lang.NoClassDefFoundError如何解决

本人初学Hibernate框架,网络上找的视频自学的,刚刚到第一次运行文件就出现这个错误,用的是eclipse,错误代码如下:

Exception in thread "main" java.lang.NoClassDefFoundError: javax/xml/bind/JAXBException
    at org.hibernate.boot.spi.XmlMappingBinderAccess.<init>(XmlMappingBinderAccess.java:43)
    at org.hibernate.boot.MetadataSources.<init>(MetadataSources.java:87)
    at org.hibernate.cfg.Configuration.<init>(Configuration.java:123)
    at org.hibernate.cfg.Configuration.<init>(Configuration.java:118)
    at cn.ljs.text.HibernateTest.main(HibernateTest.java:13)
Caused by: java.lang.ClassNotFoundException: javax.xml.bind.JAXBException
    at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(Unknown Source)
    at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(Unknown Source)
    at java.base/java.lang.ClassLoader.loadClass(Unknown Source)
    ... 5 more

文件代码如下:

package cn.ljs.text;

import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.boot.registry.StandardServiceRegistryBuilder;
import org.hibernate.cfg.Configuration;
import org.hibernate.service.ServiceRegistry;
import cn.ljs.pojo.User;

public class HibernateTest {
    public static void main(String[] args) {
        Configuration cfg=new Configuration().configure();
        ServiceRegistry registry=new StandardServiceRegistryBuilder().applySettings(cfg.getProperties()).build();
        SessionFactory factory=cfg.buildSessionFactory(registry);
        Session session=factory.openSession();
        User user=(User) session.get(User.class, 1);
        System.out.println(user);
        session.close();
        factory.close();
    }
}

很简单,就是测试一下布置有没有问题
以下是包图:
图片说明
跟着教学视频走的,代码无误,视频里直接输出了数据库表中的信息,而我就报错...

已自行百度后作出以下修改:

1.将jar包修改到classpath目录下,
图片说明
无效
2.修改classpath等配置,
图片说明
图片说明

path:D:\OracleWINDOWS.X64_180000_db_home\bin;%JAVA_HOME%\bin;%MAVEN_HOME%\bin;C:\Program Files (x86)\Common Files\Oracle\Java\javapath;D:\java\bin;C:\Program Files (x86)\NVIDIA Corporation\PhysX\Common;%SystemRoot%\system32;%SystemRoot%;%SystemRoot%\system32\wbem

我半路出家,在外面培训班学过4个月java基础,学的是SSM框架,现在想自己拓展一下学习Hibernate,哪知道一开始就遇到这问题 o(╥﹏╥)o,请高手指点!谢谢!

1个回答

weixin_43959294
手鞠寿司 多谢 完美解决
一年多之前 回复
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Explicitly configure spring.jpa.open-in-view to disable this warning 2019-08-05 10:29:20.846 INFO 7416 --- [ restartedMain] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/application/handwriting_authorization],methods=[GET]}" onto public java.lang.String com.xintujiuzhang.aimanagement.controller.ApplicationAuthorizationController.joinHWA(java.util.Map<java.lang.String, java.lang.Object>) 2019-08-05 10:29:20.847 INFO 7416 --- [ restartedMain] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/application/handwriting_information],methods=[GET]}" onto public java.lang.String com.xintujiuzhang.aimanagement.controller.ApplicationInformationController.joinHWI(java.util.Map<java.lang.String, java.lang.Object>) 2019-08-05 10:29:20.847 INFO 7416 --- [ restartedMain] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/log/background_management_login],methods=[GET]}" onto public java.lang.String com.xintujiuzhang.aimanagement.controller.BackgroundManagementLoginController.joinHWI(java.util.Map<java.lang.String, java.lang.Object>) 2019-08-05 10:29:20.847 INFO 7416 --- [ restartedMain] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/log/computer_login],methods=[GET]}" onto public java.lang.String com.xintujiuzhang.aimanagement.controller.ComputerLoginController.jumpDEM(java.util.Map<java.lang.String, java.lang.Object>) 2019-08-05 10:29:20.847 INFO 7416 --- [ restartedMain] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/authority/department_management],methods=[GET]}" onto public java.lang.String com.xintujiuzhang.aimanagement.controller.DepartmentManagementController.jumpDEM(java.util.Map<java.lang.String, java.lang.Object>) 2019-08-05 10:29:20.848 INFO 7416 --- [ restartedMain] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/authority/dictionary_management],methods=[GET]}" onto public java.lang.String com.xintujiuzhang.aimanagement.controller.DictionaryManagementController.jumpDM(java.util.Map<java.lang.String, java.lang.Object>) 2019-08-05 10:29:20.848 INFO 7416 --- [ restartedMain] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/equipment/hardware_devices],methods=[GET]}" onto public java.lang.String com.xintujiuzhang.aimanagement.controller.EquipmentManagementController.jumpDM(java.util.Map<java.lang.String, java.lang.Object>) 2019-08-05 10:29:20.848 INFO 7416 --- [ restartedMain] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/queryGetServerStatusInterface],methods=[GET]}" onto public java.util.Map<java.lang.String, java.lang.Object> com.xintujiuzhang.aimanagement.controller.GetServerStatusInterfaceController.queryGetServerStatus(java.lang.String,java.lang.String) 2019-08-05 10:29:20.848 INFO 7416 --- [ restartedMain] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/queryHandwritingInterface],methods=[GET]}" onto public java.util.Map<java.lang.String, java.lang.Object> com.xintujiuzhang.aimanagement.controller.HandwritingInterfaceController.queryHandwriting(java.lang.String,java.lang.String,java.lang.Integer,java.util.Date) 2019-08-05 10:29:20.849 INFO 7416 --- [ restartedMain] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/identity/identity_management],methods=[GET]}" onto public java.lang.String com.xintujiuzhang.aimanagement.controller.IdentityManagementController.jumpDM(java.util.Map<java.lang.String, java.lang.Object>) 2019-08-05 10:29:20.849 INFO 7416 --- [ restartedMain] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/queryInstallationRequest],methods=[GET]}" onto public java.util.Map<java.lang.String, java.lang.Object> com.xintujiuzhang.aimanagement.controller.InstallationRequestInterfaceController.queryInstallationRequest(java.lang.String,java.lang.String,java.lang.String) 2019-08-05 10:29:20.849 INFO 7416 --- [ restartedMain] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/queryLicenseInterface],methods=[GET]}" onto public java.util.Map<java.lang.String, java.lang.Object> com.xintujiuzhang.aimanagement.controller.LicenseInterfaceController.queryLicense(java.lang.String,java.lang.String,java.lang.String,java.lang.String,java.lang.String,java.util.Date) 2019-08-05 10:29:20.851 INFO 7416 --- [ restartedMain] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/]}" onto public java.lang.String com.xintujiuzhang.aimanagement.controller.MainController.main(java.util.Map<java.lang.String, java.lang.Object>) 2019-08-05 10:29:20.851 INFO 7416 --- [ restartedMain] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/login],methods=[GET]}" onto public org.springframework.web.servlet.ModelAndView com.xintujiuzhang.aimanagement.controller.MainController.login() 2019-08-05 10:29:20.851 INFO 7416 --- [ restartedMain] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/login],methods=[POST]}" onto public java.lang.String com.xintujiuzhang.aimanagement.controller.MainController.login(java.lang.String,java.lang.String,java.util.Map<java.lang.String, java.lang.Object>) 2019-08-05 10:29:20.851 INFO 7416 --- [ restartedMain] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/main],methods=[GET]}" onto public java.lang.String com.xintujiuzhang.aimanagement.controller.MainController.jumpmain(java.util.Map<java.lang.String, java.lang.Object>) 2019-08-05 10:29:20.852 INFO 7416 --- [ restartedMain] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/authority/menu_management],methods=[GET]}" onto public java.lang.String com.xintujiuzhang.aimanagement.controller.MenuManagementController.jumpMM(java.util.Map<java.lang.String, java.lang.Object>) 2019-08-05 10:29:20.852 INFO 7416 --- [ restartedMain] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/log/module_browsing],methods=[GET]}" onto public java.lang.String com.xintujiuzhang.aimanagement.controller.ModuleBrowsingController.jumpTM(java.util.Map<java.lang.String, java.lang.Object>) 2019-08-05 10:29:20.852 INFO 7416 --- [ restartedMain] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/log/module_operation],methods=[GET]}" onto public java.lang.String com.xintujiuzhang.aimanagement.controller.ModuleOperationController.jumpMM(java.util.Map<java.lang.String, java.lang.Object>) 2019-08-05 10:29:20.852 INFO 7416 --- [ restartedMain] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/deletehandwriting],methods=[POST]}" onto public void com.xintujiuzhang.aimanagement.controller.NotesController.deletehandwriting(java.lang.String) 2019-08-05 10:29:20.852 INFO 7416 --- [ restartedMain] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/updatehandwriting],methods=[POST]}" onto public void com.xintujiuzhang.aimanagement.controller.NotesController.updatehandwriting(com.xintujiuzhang.aimanagement.pojo.Handwriting) 2019-08-05 10:29:20.852 INFO 7416 --- [ restartedMain] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/addhandwriting],methods=[POST]}" onto public void com.xintujiuzhang.aimanagement.controller.NotesController.addhandwriting(com.xintujiuzhang.aimanagement.pojo.Handwriting) 2019-08-05 10:29:20.853 INFO 7416 --- [ restartedMain] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/querynotes],methods=[GET]}" onto public com.xintujiuzhang.aimanagement.pojo.Handwriting com.xintujiuzhang.aimanagement.controller.NotesController.querynotes(java.lang.String) 2019-08-05 10:29:20.853 INFO 7416 --- [ restartedMain] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/authority/parameter_settings],methods=[GET]}" onto public java.lang.String com.xintujiuzhang.aimanagement.controller.parameterSettingsController.jumpPS(java.util.Map<java.lang.String, java.lang.Object>) 2019-08-05 10:29:20.853 INFO 7416 --- [ restartedMain] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/authority/role_authorization],methods=[GET]}" onto public java.lang.String com.xintujiuzhang.aimanagement.controller.RoleAuthorizationController.jumpRA(java.util.Map<java.lang.String, java.lang.Object>) 2019-08-05 10:29:20.853 INFO 7416 --- [ restartedMain] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/log/service_call],methods=[GET]}" onto public java.lang.String com.xintujiuzhang.aimanagement.controller.ServiceCallController.jumpRA(java.util.Map<java.lang.String, java.lang.Object>) 2019-08-05 10:29:20.853 INFO 7416 --- [ restartedMain] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/authority/task_management],methods=[GET]}" onto public java.lang.String com.xintujiuzhang.aimanagement.controller.TaskManagementController.jumpTM(java.util.Map<java.lang.String, java.lang.Object>) 2019-08-05 10:29:20.854 INFO 7416 --- [ restartedMain] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/authority/user_management]}" onto public java.lang.String com.xintujiuzhang.aimanagement.controller.UserController.jnmpUM(java.util.Map<java.lang.String, java.lang.Object>) 2019-08-05 10:29:20.854 INFO 7416 --- [ restartedMain] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/queryUserInterface],methods=[GET]}" onto public java.util.Map<java.lang.String, java.lang.Object> com.xintujiuzhang.aimanagement.controller.UserInterfaceController.queryLicense(java.lang.String,java.lang.String,java.lang.Integer,java.util.Date) 2019-08-05 10:29:20.854 INFO 7416 --- [ restartedMain] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/queryVersionCheckingInterface],methods=[GET]}" onto public java.util.Map<java.lang.String, java.lang.Object> com.xintujiuzhang.aimanagement.controller.VersionCheckingInterfaceController.queryVersionChecking(java.lang.String,java.lang.String,java.lang.String,java.lang.String,java.lang.String,java.lang.Integer,java.util.Date) 2019-08-05 10:29:20.854 INFO 7416 --- [ restartedMain] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/queryVersionupdateInterface],methods=[GET]}" onto public java.util.Map<java.lang.String, java.lang.Object> com.xintujiuzhang.aimanagement.controller.VersionUpdateInterfaceController.queryVersionupdate(java.lang.String,java.lang.String,java.lang.String,java.util.Date) 2019-08-05 10:29:20.857 INFO 7416 --- [ restartedMain] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/error]}" onto public org.springframework.http.ResponseEntity<java.util.Map<java.lang.String, java.lang.Object>> org.springframework.boot.autoconfigure.web.servlet.error.BasicErrorController.error(javax.servlet.http.HttpServletRequest) 2019-08-05 10:29:20.857 INFO 7416 --- [ restartedMain] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/error],produces=[text/html]}" onto public org.springframework.web.servlet.ModelAndView org.springframework.boot.autoconfigure.web.servlet.error.BasicErrorController.errorHtml(javax.servlet.http.HttpServletRequest,javax.servlet.http.HttpServletResponse) 2019-08-05 10:29:20.881 INFO 7416 --- [ restartedMain] o.s.w.s.handler.SimpleUrlHandlerMapping : Mapped URL path [/webjars/**] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler] 2019-08-05 10:29:20.881 INFO 7416 --- [ restartedMain] o.s.w.s.handler.SimpleUrlHandlerMapping : Mapped URL path [/**] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler] 2019-08-05 10:29:20.906 INFO 7416 --- [ restartedMain] o.s.w.s.handler.SimpleUrlHandlerMapping : Mapped URL path [/**/favicon.ico] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler] 2019-08-05 10:29:21.115 INFO 7416 --- [ restartedMain] o.s.b.d.a.OptionalLiveReloadServer : LiveReload server is running on port 35729 2019-08-05 10:29:21.164 INFO 7416 --- [ restartedMain] o.s.j.e.a.AnnotationMBeanExporter : Registering beans for JMX exposure on startup 2019-08-05 10:29:21.165 INFO 7416 --- [ restartedMain] o.s.j.e.a.AnnotationMBeanExporter : Bean with name 'dataSource' has been autodetected for JMX exposure 2019-08-05 10:29:21.170 INFO 7416 --- [ restartedMain] o.s.j.e.a.AnnotationMBeanExporter : Located MBean 'dataSource': registering with JMX server as MBean [com.zaxxer.hikari:name=dataSource,type=HikariDataSource] 2019-08-05 10:29:21.196 INFO 7416 --- [ restartedMain] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat started on port(s): 8080 (http) with context path '' 2019-08-05 10:29:21.198 INFO 7416 --- [ restartedMain] com.xintujiuzhang.aimanagement.App : Started App in 8.458 seconds (JVM running for 8.828) Exception in thread "Thread-12" java.lang.RuntimeException: java.lang.NullPointerException at com.mysql.jdbc.JDBC4Connection$1$1.run(JDBC4Connection.java:106) Caused by: java.lang.NullPointerException at com.mysql.jdbc.ConnectionImpl.abortInternal(ConnectionImpl.java:1240) at com.mysql.jdbc.JDBC4Connection$1$1.run(JDBC4Connection.java:104) **在执行一些方法后“Thread-12”会不断增加** **ps:“Thread-668"**

Exception in thread "main" java.lang.

从svn上down下来的源码,在搭建本机环境的时候报错 ``` Exception in thread "main" java.lang.UnsupportedClassVersionError: org/apdplat/word/analysis/TextSimilarity : Unsupported major.minor version 52.0 2 at java.lang.ClassLoader.defineClass1(Native Method) 3 at java.lang.ClassLoader.defineClass(Unknown Source) 4 at java.security.SecureClassLoader.defineClass(Unknown Source) 5 at java.net.URLClassLoader.defineClass(Unknown Source) 6 at java.net.URLClassLoader.access$100(Unknown Source) 7 at java.net.URLClassLoader$1.run(Unknown Source) 8 at java.net.URLClassLoader$1.run(Unknown Source) 9 at java.security.AccessController.doPrivileged(Native Method) 10 at java.net.URLClassLoader.findClass(Unknown Source) 11 at java.lang.ClassLoader.loadClass(Unknown Source) 12 at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source) 13 at java.lang.ClassLoader.loadClass(Unknown Source) 14 at com.platform.config.run.JfinalConfig.afterJFinalStart(JfinalConfig.java:184) 15 at com.jfinal.core.JFinalFilter.init(JFinalFilter.java:55) 16 at org.eclipse.jetty.servlet.FilterHolder.doStart(FilterHolder.java:119) 17 at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:64) 18 at org.eclipse.jetty.servlet.ServletHandler.initialize(ServletHandler.java:724) 19 at org.eclipse.jetty.servlet.ServletContextHandler.startContext(ServletContextHandler.java:265) 20 at org.eclipse.jetty.webapp.WebAppContext.startContext(WebAppContext.java:1250) 21 at org.eclipse.jetty.server.handler.ContextHandler.doStart(ContextHandler.java:706) 22 at org.eclipse.jetty.webapp.WebAppContext.doStart(WebAppContext.java:492) 23 at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:64) 24 at org.eclipse.jetty.server.handler.HandlerWrapper.doStart(HandlerWrapper.java:95) 25 at org.eclipse.jetty.server.Server.doStart(Server.java:277) 26 at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:64) 27 at com.jfinal.server.JettyServer.doStart(JettyServer.java:135) 28 at com.jfinal.server.JettyServer.start(JettyServer.java:67) 29 at com.jfinal.core.JFinal.start(JFinal.java:154) 30 at com.platform.config.run.JfinalConfig.main(JfinalConfig.java:210) ``` 在各种网站上查阅了一下,说是用低版本的JDK编译高版本的.class就会报这个错,有以下两种易发生的情况: 1,命令行输入java -version和javac -version发现版本不一致,修改之; 2,版本一致则检查Path路径,一般安装oracle的机子配置jdk的时候会覆盖路径,修改之。 但是! 一,我没有装Oracle; Path路径为: d:\data\mblog\graphicsmagick-1.3.23-q8; C:\Windows\system32; C:\Windows; C:\Windows\System32\Wbem; C:\Windows\System32\WindowsPowerShell\v1.0\; D:\jdk1.7\bin; D:\jdk1.7\jre\bin; D:\mysqlinstallation\MySQL Utilities 1.3.6\; D:\maven\apache-maven-3.3.9\bin; 二,javac -version 下是java version “1.7.0_13” java -version下是 javac 1.7.0_13 所以,现在问题会出现在哪儿呢? 我使用的是eclipse,jfinal,maven

List操作错误Exception in thread "main" java.lang.IllegalStateException

Iterator<Teacher> iter = teacherList.iterator(); while(iter.hasNext()){ Teacher teacher =iter.next(); //①查找老师的最大上限值,如果该老师已经达到上限了,则将该老师从List中拿出,不予安排 if(teacher.getMaxnum()<=teacher.getRealnum()){ iter.remove(); teacherList.remove(teacher); } //②找到该考试的时间点,如果该考试桶中存在与该老师的ID则将该老师摘除,不予考虑. if(examBarrelDao.isRelated(exam,teacher)){ iter.remove(); teacherList.remove(teacher); } } //③按照监考上限减去监考下限差额最大的顺序排列,取该老师序列的第一个为最优老师。 for(int i=0;i<teacherList.size()-1;i++){ for (int j=i+1;j<teacherList.size();j++){ Teacher teacher = new Teacher(); if(teacherList.get(i).getMaxnum()-teacherList.get(i).getRealnum() <teacherList.get(j).getMaxnum()-teacherList.get(j).getRealnum()){ teacher =teacherList.get(i); teacherList.set(i, teacherList.get(j)); teacherList.set(j, teacher); } } 我将得到的List判断以后,remove了其中的不符合条件的teacher,然后将List中剩余的teacher重新按照大小进行了一次排序,但是有时报 Exception in thread "main" java.lang.IllegalStateException at java.util.AbstractList$Itr.remove(Unknown Source) at com.sdjzglxy.jwMis.help.ConditionalJudge.listTeacher(ConditionalJudge.java:229) at com.sdjzglxy.jwMis.help.ConditionalJudge.teacherChoiceForSecond(ConditionalJudge.java:162) at com.sdjzglxy.jwMis.action.ArrayExam.arraySecondTeacher(ArrayExam.java:132) at com.sdjzglxy.jwMis.action.ArrayExam.main(ArrayExam.java:159) 有时对有时错,我想问一下,该如何解决这个问题……

Java中遇到的一个异常Exception in thread "main" java.lang.NullPointerException

import java.util.*; public class NewHashTest { public static void main(String[] args) { HashMap hash = new HashMap(); Emp emp1 = new Emp("laoda","111",123f); Emp emp2 = new Emp("laoer","222",234f); Emp emp3 = new Emp("laosan","333",5466f); hash.put(111,emp1); hash.put(222,emp2); hash.put(333,emp3); if(hash.containsKey(111)) { Emp em = (Emp)hash.get(111); em.info();//可以正常显示 } Iterator iter = hash.keySet().iterator(); while(iter.hasNext()) { String key = iter.next().toString(); Emp ems = (Emp)hash.get(key); ems.info();//这里会报错 } } } class Emp { String name; String number; float slary; public void info() { System.out.println("名字叫:"+name); System.out.println("编号为:"+number); System.out.println("薪水是:"+slary); } public Emp(String name,String number,float slary) { this.name = name; this.number = number; this.slary = slary; } } 会在ems.info();一行报一个Exception in thread "main" java.lang.NullPointerException的错误,是不是传入的KEY类型有问题,还是什么别的问题,求指点。

求助:用Java编写存取款程序,报错 $Exception in thread "main" 和java.lang.IllegalStateException: Scanner closed

package piggybank; import java.util.Scanner; public class piggybank { public static void main(String[] args) { Scanner input = new Scanner(System.in); System.out.println("Welcome to the Piggy Bank. Please enter starting balance: "); double startingBalance = input.nextDouble(); System.out.println("Piggy Bank ATM"); System.out.printf("Balance : %6.2f", startingBalance); System.out.println(); while (true){ System.out.println(); System.out.println("OPTIONS"); System.out.println(); System.out.println("1.Deposit\n"+"2.Withdraw\n"+"3.Quit\n"); System.out.println(); System.out.println("Choose one:"); int option = input.nextInt(); switch (option) { case 1: System.out.println("Enter deposit amount:\n" + "Piggy Bank ATM"); double deposit = input.nextDouble(); double depositBalance= startingBalance + deposit; System.out.printf(" Balance: $%6.2f ",depositBalance); System.out.println(); break; case 2: System.out.println("Enter withdrawal amount:\n" + "Piggy Bank ATM"); double withdraw = input.nextDouble(); double withdrawBalance= startingBalance - withdraw; System.out.printf("Balance:$%8.2f ",withdrawBalance); System.out.println(); break; case 3: System.out.printf("Ending Balance: $%8.2f ", startingBalance); break; } input.close(); } } } 我想要反复执行存取款程序,但是就会显示出错 ![图片说明](https://img-ask.csdn.net/upload/201909/28/1569658326_406248.png) 求帮忙! 想要得到以下运行结果 ![图片说明](https://img-ask.csdn.net/upload/201909/28/1569658512_523449.png) 我的运行结果是这样的,没有办法进行第二次输入 ![图片说明](https://img-ask.csdn.net/upload/201909/28/1569658741_470527.png) 呜呜呜,初学什么都不会,求助

启动hive时报错Exception in thread "main" java.lang.NoSuchMethodError: com.google.common.base.Preconditions.checkArgument(ZLjava/lang/String;Ljava/lang/Object;)V

``` Exception in thread "main" java.lang.NoSuchMethodError: com.google.common.base.Preconditions.checkArgument(ZLjava/lang/String;Ljava/lang/Object;)V at org.apache.hadoop.conf.Configuration.set(Configuration.java:1357) at org.apache.hadoop.conf.Configuration.set(Configuration.java:1338) at org.apache.hadoop.mapred.JobConf.setJar(JobConf.java:536) at org.apache.hadoop.mapred.JobConf.setJarByClass(JobConf.java:554) at org.apache.hadoop.mapred.JobConf.<init>(JobConf.java:448) at org.apache.hadoop.hive.conf.HiveConf.initialize(HiveConf.java:5141) at org.apache.hadoop.hive.conf.HiveConf.<init>(HiveConf.java:5099) at org.apache.hadoop.hive.common.LogUtils.initHiveLog4jCommon(LogUtils.java:97) at org.apache.hadoop.hive.common.LogUtils.initHiveLog4j(LogUtils.java:81) at org.apache.hadoop.hive.cli.CliDriver.run(CliDriver.java:699) at org.apache.hadoop.hive.cli.CliDriver.main(CliDriver.java:683) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:498) at org.apache.hadoop.util.RunJar.run(RunJar.java:323) at org.apache.hadoop.util.RunJar.main(RunJar.java:236) ```

eclipse运行显示Exception in thread "main" java.lang.NullPointerException at work_7.Bank.Openuser(Test.java:46) at work_7.Test.main(Test.java:12)

eclipse运行显示Exception in thread "main" java.lang.NullPointerException at work_7.Bank.Openuser(Test.java:46) at work_7.Test.main(Test.java:12) 拜求各位大佬,帮忙解决一下!!!! ![图片说明](https://img-ask.csdn.net/upload/202004/20/1587390228_349436.png) ``` public class Test { public static void main(String []args){ Bank bank = new Bank(); bank.Openuser("丁老头","12345",100.1); bank.Openuser("丁老太","234567",200.5); bank.Openuser("丁小胖","3456778",300.2); bank.SearchMoney("丁小胖"); Account account = new Account("丁小女","567896",500.43); account.SaveMoney(500.123); account.DrawMoney(1000); } } ``` ``` class Account{ String username; String password; double money; Account(String username,String password,double money) { this.username=username; this.password=password; this.money=money; } void SaveMoney(double addmoney){ this.money+=addmoney; System.out.println(username +" : 存钱以后,"+money); } void DrawMoney(double decmoney){ this.money-=decmoney; System.out.println(username +" : 取钱以后,"+money); } } ``` ``` class Bank{ String name; ArrayList<Account> list; void Openuser(String username,String password,double money){ try{list.add(new Account(username,password,money));} catch(Exception ex){System.out.println("插入异常");} } void SearchMoney(String username){ for(int i=0;i<list.size();i++) { if(list.get(i).username==username){ System.out.println(username+" : "+"剩余金额为, "+list.get(i).money); } } } } ```

Exception in thread "main" java.lang.Error

package com.dlhs; class Person(){ public void setName(String name){ this.name=name; } public void setAge(int age){ this.age=age; } public return String getName(){ return name; } public return int getAge(){ return age; } } class Student extends Person() { public return String getSchool(){ return school; } public void setSchool(String school){ this.school =school; } } public class Test{ public static void main(String args[]){ public String school; public String name; public int age; Student student =new Student(); student.setName("john"); student.setAge(18); student.setSchool("SCH"); System.out.println(student.getName()); System.out.println(student.getAge()); System.out.println(student.getSchool());} }

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