菜鸟问题现在在接触hibernate（找不到驱动设置的时候测试成功啊）运行一个测试类出现如下Javacodelog4j:WARNNoappenderscouldbefoundforlogger(org.hibernate.cfg.Environment).log4j:WARNPleaseinitializethelog4jsystemproperly.1423'>Exceptioninthread...

org.hibernate.HibernateException:JDBCDriverclassnotfound:com.mysql.jdbc.ri大侠请指教那里有错啊1423'>Exceptioninthread"main"org.hibernate.HibernateException:JDBCDriverclassnotfound:com.mysql.jdbc.river...

sessionFactory为Null!!!Javacodepackagecom.choiwan;importorg.hibernate.SessionFactory;importorg.hibernate.cfg.Configuration;publicclassHibernateDemo{publicstaticvoidmain(Stringargs[]){//Configuration负责管...

异常信息:org.hibernate.exception.SQLGrammarException:couldnotexecutequery,大家帮帮忙好吗这是mani方法:Sessionss=HbUtil.getSession(); Transactiontrans=ss.beginTransaction(); //Personper=newPerson(); Queryquery=ss.crea...

初学Spring，写了一个简单的helloword就遇到了问题。1423'>Exceptioninthread"main"org.springframework.beans.factory.BeanDefinitionStoreException:Errorregisteringbeanwithname'log'definedinfile[D:\eclipse\eclipse\...

初学spring遇到的第一个问题，请高手指点类一：packageonlyfun.caterpillar;publicclassHelloBean{ privateStringhelloWord; publicvoidsetHelloWord(StringhelloWord){ this.helloWord=helloWord; } publicStringgetHelloWord(){ ret...

请教大牛，我写的程序编译没有错。解释时老是出现错误：1423'>Exceptioninthread"main"java.lang.NullPointerExceptJavacodeimportjava.awt.*;importjava.awt.GridBagConstraints;importjava.awt.GridBagLayout;importjava.awt.GridL...

java在窗口中显示文本和图形LabelFrame类：importjava.awt.FlowLayout;importjavax.swing.JFrame;importjavax.swing.JLabel;importjavax.swing.SwingConstants;importjavax.swing.Icon;importjavax.swing.ImageIcon;publicclassLa...

eclipse下运行简单程序，出现1423'>Exceptioninthread"main"java.lang.ClassNotFoundException错误请看一下：源码：JavacodepackageTtest;importjava.lang.reflect.Field;importCommen.Tstring;;publicclassReflection_Test{pu...

java.lang.ClassNotFoundException异常？Javacodepackagecn.com.starit.io;importjava.io.IOException;importjava.io.OutputStream;publicclassSystemDemo02{publicstaticvoidmain(String[]args){OutputStreamout=Syste...

多线程测试，内存溢出，为什么java没给我自动回收垃圾？Javacodeimportjava.util.Date;importjava.util.Timer;importjava.util.TimerTask;publicclassT{privatestaticintcount=0;/***@paramargs*/publicstaticvoidmain(String[]args){classMy...

数组空指针的问题请问这个错在哪里？？？？？char[]letter={'a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v','w','x','y','z'};intc=0;Stringb=jTextField2.getText();char[]a1=null;for(inti=...

集合Collections使用的问题Collections字段EMPTY_SET、EMPTY_LIST和EMPTY_MAP分别起到了什么作用呢？我用以下代码：JavacodeList<String>list=Collections.EMPTY_LIST;list.add("aa");System.err.println(list.size());会报1423'>Ex...

1423'>Exceptioninthread"main"java.lang.NullPointerException求大牛帮忙解决,30行小程序publicclasssmp11{ publicstaticvoidmain(Stringargs[]) { kolkl=newko(); lkl.intiko(); }}classscore{intenGrade;publicv...

各位前辈麻烦你们帮我解决下这个问题，是关于HttpURLConnection类的问题？传智播客视频里的一段代码Javacodepackagecn.zcp.downlod;importjava.io.File;importjava.io.FileNotFoundException;importjava.io.IOException;importjava.io.InputStream;importja...

求助ObjectInputStream用法第一次用这个字节流如下Javacodeimportjava.io.*;classStudentimplementsSerializable{privateStringname;publicStudent(Stringname){this.name=name;}publicStringgetName(){returnthis.name;}publicStri...

新手，求解正则表达式问题JavacodepublicclassSnippet{publicstaticvoidmain(String[]args)throwsUnsupportedEncodingException{Stringa=newString("a\\");//匹配a\System.out.println(a.matches("[a\\]"));//...

关于java反射中的Class异常？下面是java的简单工厂方法我用了java的反射机制。可它老是出现异常啊，上网查了下也没找到解决方法，那位能告诉我是什么原因啊，小弟在此谢了。publicinterfaceAnimal{ publicvoidrun();}publicclassTigerimplementsAnimal{ publicvoidTiger() { } publicvoid...

JDBCexecuteQuery问题importjava.sql.*;importjava.util.*;importjava.io.*;publicclassCharu{ publicStringdriver; Connectionconn; publicStringpass; publicStringuser; publicStringurl; Statementsta; publicvoi...

dos下运行java程序Package的问题如下一段程序packagecom.test.demo;publicclassTest{ /** *@paramargs */ publicstaticvoidmain(String[]args){ //TODOAuto-generatedmethodstub System.out.println("！！！！!"); }}[colo...