DriverManager.getConnection错误java.sql.SQLException:java.lang.ClassCastException:java.math.BigInteger无法转换为java.lang.Long
我试图学习如何从桌面java应用程序连接到mysql,但是连接方法DriverManager.getConnection错误java.sql.SQLException:java.lang.ClassCastException:java.math.BigInteger无法转换为java.lang.Long,java,mysql,Java,Mysql,我试图学习如何从桌面java应用程序连接到mysql,但是连接方法Class.forName(“com.mysql.jdbc.Driver”) 当我调用它时,它返回以下期望: java.sql.SQLException: java.lang.ClassCastException: java.math.BigInteger cannot be cast to java.lang.Long 我重新安装了J/接头(我无法单独下载,它与安装程序中的其他驱动程序一起提供,我将驱动程序添加为库,并尝试使用
Class.forName(“com.mysql.jdbc.Driver”)代码>
当我调用它时,它返回以下期望:
java.sql.SQLException: java.lang.ClassCastException: java.math.BigInteger cannot be cast to java.lang.Long
我重新安装了J/接头(我无法单独下载,它与安装程序中的其他驱动程序一起提供,我将驱动程序添加为库,并尝试使用com.mysql.jdbc.Connection
,以及java.sql.Connection
类。这两个类抛出了相同的错误。我寻找了其他类似的问题,但没有一个解决了问题,还有什么可以解决的是吗?我在哪里可以下载旧的J/连接驱动程序?我应该重新安装整个netbeans吗?
我想知道。。。
以下是我的方法,注释了不必要的代码:
public static final String URL = "jdbc:mysql://localhost:3306/escuela";
public static final String USERNAME = "root";
public static final String PASSWORD = "123";
public static Connection getConnection(){
Connection con = null;
try{
Class.forName("com.mysql.jdbc.Driver");
con = DriverManager.getConnection(URL, USERNAME, PASSWORD); //here
fails.
JOptionPane.showMessageDialog(null, "Conexion exitosa.");
}
catch(Exception e){
e.printStackTrace();
}
return con;
}
private void btnConectarActionPerformed(java.awt.event.ActionEvent evt) {
Connection con = getConnection(); //I call the connection here
// Statement st;
// ResultSet rs;
//
// try{
// st = con.createStatement();
// rs = st.executeQuery("SELECT * FROM personas");
//
// while(rs.next()){
// JOptionPane.showMessageDialog(null, rs.getString("nombre")
// + " " + rs.getString("telefono"));
// }
// con.close();
// }
// catch(Exception e){
// System.out.println(e);
// }
}
整个e.printStackTrace:
java.sql.SQLException: java.lang.ClassCastException: java.math.BigInteger cannot be cast to java.lang.Long
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1074)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:988)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:974)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:919)
at com.mysql.jdbc.ConnectionImpl.buildCollationMapping(ConnectionImpl.java:1062)
at com.mysql.jdbc.ConnectionImpl.initializePropsFromServer(ConnectionImpl.java:3556)
at com.mysql.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:2513)
at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2283)
at com.mysql.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:822)
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:422)
at com.mysql.jdbc.Util.handleNewInstance(Util.java:411)
at com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:404)
at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:317)
at java.sql.DriverManager.getConnection(DriverManager.java:664)
at java.sql.DriverManager.getConnection(DriverManager.java:247)
at App.conexion.getConnection(conexion.java:93)
at App.conexion.btnConectarActionPerformed(conexion.java:70)
at App.conexion.access$000(conexion.java:19)
at App.conexion$1.actionPerformed(conexion.java:45)
at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2022)
at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2348)
at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:402)
at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:259)
at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:252)
at java.awt.Component.processMouseEvent(Component.java:6535)
at javax.swing.JComponent.processMouseEvent(JComponent.java:3324)
at java.awt.Component.processEvent(Component.java:6300)
at java.awt.Container.processEvent(Container.java:2236)
at java.awt.Component.dispatchEventImpl(Component.java:4891)
at java.awt.Container.dispatchEventImpl(Container.java:2294)
at java.awt.Component.dispatchEvent(Component.java:4713)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4888)
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4525)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4466)
at java.awt.Container.dispatchEventImpl(Container.java:2280)
at java.awt.Window.dispatchEventImpl(Window.java:2750)
at java.awt.Component.dispatchEvent(Component.java:4713)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:758)
at java.awt.EventQueue.access$500(EventQueue.java:97)
at java.awt.EventQueue$3.run(EventQueue.java:709)
at java.awt.EventQueue$3.run(EventQueue.java:703)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:76)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:86)
at java.awt.EventQueue$4.run(EventQueue.java:731)
at java.awt.EventQueue$4.run(EventQueue.java:729)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:76)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:728)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)
Caused by: java.lang.ClassCastException: java.math.BigInteger cannot be cast
to java.lang.Long
at
com.mysql.jdbc.ConnectionImpl.buildCollationMapping(ConnectionImpl.java:1007)
... 54 more
java.sql.SQLException:java.lang.ClassCastException:java.math.BigInteger不能强制转换为java.lang.Long
位于com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1074)
位于com.mysql.jdbc.SQLError.createSQLException(SQLError.java:988)
位于com.mysql.jdbc.SQLError.createSQLException(SQLError.java:974)
位于com.mysql.jdbc.SQLError.createSQLException(SQLError.java:919)
位于com.mysql.jdbc.ConnectionImpl.buildCollationMapping(ConnectionImpl.java:1062)
位于com.mysql.jdbc.ConnectionImpl.initializePropsFromServer(ConnectionImpl.java:3556)
位于com.mysql.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:2513)
位于com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2283)
位于com.mysql.jdbc.ConnectionImpl(ConnectionImpl.java:822)
位于com.mysql.jdbc.JDBC4Connection(JDBC4Connection.java:47)
位于sun.reflect.NativeConstructorAccessorImpl.newInstance0(本机方法)
位于sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
在sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
位于java.lang.reflect.Constructor.newInstance(Constructor.java:422)
位于com.mysql.jdbc.Util.HandleneInstance(Util.java:411)
位于com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:404)
位于com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:317)
位于java.sql.DriverManager.getConnection(DriverManager.java:664)
位于java.sql.DriverManager.getConnection(DriverManager.java:247)
位于App.conexion.getConnection(conexion.java:93)
在App.conexion.btnConconnectarActionPerformed(conexion.java:70)
访问App.conexion.access$000(conexion.java:19)
在App.conexion$1.actionPerformed(conexion.java:45)
在javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2022)
位于javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2348)
在javax.swing.DefaultButtonModel.fireActionPerformed上(DefaultButtonModel.java:402)
在javax.swing.DefaultButtonModel.setPressed中(DefaultButtonModel.java:259)
在javax.swing.plaf.basic.BasicButtonListener.MouseRelease(BasicButtonListener.java:252)
位于java.awt.Component.ProcessMouseeEvent(Component.java:6535)
位于javax.swing.JComponent.ProcessMouseeEvent(JComponent.java:3324)
位于java.awt.Component.processEvent(Component.java:6300)
位于java.awt.Container.processEvent(Container.java:2236)
位于java.awt.Component.dispatchEventImpl(Component.java:4891)
位于java.awt.Container.dispatchEventImpl(Container.java:2294)
位于java.awt.Component.dispatchEvent(Component.java:4713)
位于java.awt.LightweightDispatcher.RetargetMouseeEvent(Container.java:4888)
位于java.awt.LightweightDispatcher.ProcessMouseeEvent(Container.java:4525)
位于java.awt.LightweightDispatcher.dispatchEvent(Container.java:4466)
位于java.awt.Container.dispatchEventImpl(Container.java:2280)
位于java.awt.Window.dispatchEventImpl(Window.java:2750)
位于java.awt.Component.dispatchEvent(Component.java:4713)
位于java.awt.EventQueue.dispatchEventImpl(EventQueue.java:758)
在java.awt.EventQueue.access$500(EventQueue.java:97)
在java.awt.EventQueue$3.run(EventQueue.java:709)
在java.awt.EventQueue$3.run(EventQueue.java:703)
位于java.security.AccessController.doPrivileged(本机方法)
位于java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:76)
位于java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:86)
在java.awt.EventQueue$4.run(EventQueue.java:731)
在java.awt.EventQueue$4.run(EventQueue.java:729)
位于java.security.AccessController.doPrivileged(本机方法)
位于java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:76)
位于java.awt.EventQueue.dispatchEvent(EventQueue.java:728)
位于java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201)
在java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116)中
位于java.awt.EventDispatchThread.PumpeEventsforHierarchy(EventDispatchThread.java:105)
位于java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
位于java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)
在java.awt.EventDispatchThread.run(EventDispatchThread.java:82)
原因:java.lang.ClassCastException:java.math.BigInteger无法强制转换
到java.lang.Long
在
com.mysql.jdbc.ConnectionImpl.buildCollationMapping(ConnectionImpl.java:1007)
…还有54个
多亏了Cirille Con Morales,多亏了链接和下载说明,我终于成功了。我的Netbeans安装了一个旧的MySql连接器驱动程序(5.xxx)。我下载了(8.0.17)版本,添加到了全局库中,并解决了其他问题,但在谷歌中挖掘我解决了这些问题,这部分必须更改:
我使用的驱动程序有一个字符串url:
public static final String DRIVER = "com.mysql.cj.jdbc.Driver";
然后是关于timezine应用程序的错误
public static final String URL =
"jdbc:mysql://localhost:3306/escuela?
useUnicode=true&useJDBCCompliantTimezoneShift
=true&useLegacyDatetimeCode=false&serverTimezone=UTC";
public static Connection getConnection(){
Connection con = null;
try{
Class.forName(DRIVER);
con = DriverManager.getConnection(URL, USERNAME, PASSWORD);
JOptionPane.showMessageDialog(null, "Conexion exitosa.");
}
catch(Exception e){
e.printStackTrace();
}
return con;
}