3回答

• 

  慕尼黑9189017

  2018-09-13 06:26:05

  问题找到了，数据库没有设置密码，重新设下密码重启服务就成功了

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• 

  慕尼黑9189017

  2018-09-12 18:13:31

  这是配置文件，哪出错了

  <?xml version="1.0" encoding="UTF-8"?>

  <!DOCTYPE hibernate-configuration PUBLIC

  "-//Hibernate/Hibernate Configuration DTD 3.0//EN"

  "http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">

  <hibernate-configuration>

      <session-factory>

      <property name="connection.username">root</property> <!-- 用户名 -->

      <property name="connection.password"></property> <!-- 用户密码 -->

      <property name="connection.driver_class">com.mysql.jdbc.Driver</property> <!-- 使用Mysql的驱动，连接Mysql数据库就用这个类名 -->

      <property name="connection.url">jdbc:mysql:///hibernate?useUnicode=true&amp;characterEncoding=UTF-8</property> <!-- 访问数据库地址 -->

      <!-- jdbc:mysql:///hibernate --> <!-- jdbc:mysql://localhost:3306/hibernate-->

      

      <property name="dialect">org.hibernate.dialect.MySQL5Dialect</property> <!-- 访问数据库的方言 -->

      

      <property name="show_sql">true</property> 

      <property name="format_sql">true</property> <!--  -->

      <property name="hbm2ddl.auto">create</property> <!-- ddl生成策略 -->

      

      <mapping resource="Students.hbm.xml"/> <!-- 这是创建的对象关系映射，把这个配置文件添加到这里 -->

      </session-factory>

  </hibernate-configuration>

  
  

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• 

  慕尼黑9189017

  2018-09-12 18:08:55

  其中一个问题的原因找到了，xml其中一个标签没放在第一行

  org.hibernate.exception.GenericJDBCException: Could not open connection

  at org.hibernate.exception.internal.StandardSQLExceptionConverter.convert(StandardSQLExceptionConverter.java:54)

  at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:125)

  at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:110)

  at org.hibernate.engine.jdbc.internal.LogicalConnectionImpl.obtainConnection(LogicalConnectionImpl.java:221)

  at org.hibernate.engine.jdbc.internal.LogicalConnectionImpl.getConnection(LogicalConnectionImpl.java:157)

  at org.hibernate.engine.transaction.internal.jdbc.JdbcTransaction.doBegin(JdbcTransaction.java:67)

  at org.hibernate.engine.transaction.spi.AbstractTransactionImpl.begin(AbstractTransactionImpl.java:160)

  at org.hibernate.internal.SessionImpl.beginTransaction(SessionImpl.java:1426)

  at StudentsTest.init(StudentsTest.java:36)

  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:483)

  at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:45)

  at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)

  at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:42)

  at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:27)

  at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:30)

  at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:263)

  at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:68)

  at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:47)

  at org.junit.runners.ParentRunner$3.run(ParentRunner.java:231)

  at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:60)

  at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:229)

  at org.junit.runners.ParentRunner.access$000(ParentRunner.java:50)

  at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:222)

  at org.junit.runners.ParentRunner.run(ParentRunner.java:300)

  at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:86)

  at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)

  at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:538)

  at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:760)

  at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:460)

  at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:206)

  Caused by: java.sql.SQLException: Access denied for user 'root'@'localhost' (using password: NO)

  at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:965)

  at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3978)

  at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3914)

  at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:871)

  at com.mysql.jdbc.MysqlIO.proceedHandshakeWithPluggableAuthentication(MysqlIO.java:1714)

  at com.mysql.jdbc.MysqlIO.doHandshake(MysqlIO.java:1224)

  at com.mysql.jdbc.ConnectionImpl.coreConnect(ConnectionImpl.java:2199)

  at com.mysql.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:2230)

  at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2025)

  at com.mysql.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:778)

  at com.mysql.jdbc.JDBC4Connection.<init>(JDBC4Connection.java:47)

  at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)

  at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)

  at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)

  at java.lang.reflect.Constructor.newInstance(Constructor.java:408)

  at com.mysql.jdbc.Util.handleNewInstance(Util.java:425)

  at com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:386)

  at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:330)

  at org.hibernate.service.jdbc.connections.internal.DriverManagerConnectionProviderImpl.getConnection(DriverManagerConnectionProviderImpl.java:204)

  at org.hibernate.internal.AbstractSessionImpl$NonContextualJdbcConnectionAccess.obtainConnection(AbstractSessionImpl.java:292)

  at org.hibernate.engine.jdbc.internal.LogicalConnectionImpl.obtainConnection(LogicalConnectionImpl.java:214)

  ... 29 more

  
  

  java.lang.NullPointerException

  at StudentsTest.destory(StudentsTest.java:41)

  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:483)

  at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:45)

  at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)

  at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:42)

  at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:36)

  at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:263)

  at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:68)

  at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:47)

  at org.junit.runners.ParentRunner$3.run(ParentRunner.java:231)

  at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:60)

  at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:229)

  at org.junit.runners.ParentRunner.access$000(ParentRunner.java:50)

  at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:222)

  at org.junit.runners.ParentRunner.run(ParentRunner.java:300)

  at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:86)

  at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)

  at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:538)

  at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:760)

  at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:460)

  at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:206)

  
  

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