出现Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException的报错

问题遇到的现象和发生背景

这是纯Java编写的代码，在我点击注册按钮，想把数据写入数据库，就出现了Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException

问题相关代码，请勿粘贴截图

        Connection con1=Mysql.con;
        PreparedStatement presql;
        
        String ur1="insert into user values(?,?,?)";
        try {
            //System.out.print(ur1);
             presql=con1.prepareStatement(ur1);
             presql.setString(1,name);
             presql.setString(2,account);
             presql.setString(3,password);
            //sql=con.createStatement();
        } catch (SQLException e) {
            System.out.println(e);
        }

运行结果及报错内容

报错：
Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
at com.event.AccountEvent.jbutton(AccountEvent.java:68)
at com.event.AccountEvent.actionPerformed(AccountEvent.java:27)
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:6533)
at javax.swing.JComponent.processMouseEvent(JComponent.java:3324)
at java.awt.Component.processEvent(Component.java:6298)
at java.awt.Container.processEvent(Container.java:2238)
at java.awt.Component.dispatchEventImpl(Component.java:4889)
at java.awt.Container.dispatchEventImpl(Container.java:2296)
at java.awt.Component.dispatchEvent(Component.java:4711)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4897)
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4534)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4475)
at java.awt.Container.dispatchEventImpl(Container.java:2282)
at java.awt.Window.dispatchEventImpl(Window.java:2746)
at java.awt.Component.dispatchEvent(Component.java:4711)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:760)
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:80)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:90)
at java.awt.EventQueue$4.run(EventQueue.java:733)
at java.awt.EventQueue$4.run(EventQueue.java:731)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:80)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:730)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:205)
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)

我的解答思路和尝试过的方法

暂时没有

我想要达到的结果

能够写入数据库里

System.out.println(e);

报错信息是catch中输出的吗，如果报错，应该不能入库的。
错误提示中，没有提到自定义代码异常的地方。