JAVAFX创建JavaDB表

我有一个表单，当释放“提交”按钮时，我想创建一个表或查找以前创建的表，然后将表单数据写入表中。问题是，由于某些原因，我无法获取当前代码以在数据库中创建新表。有人能看看我目前的代码，告诉我哪里出了问题吗

以下是表单控制器中按钮的代码：

@FXML
private void OnRelease_hazard(MouseEvent event) {
   Connection c ;
    final String HAZARD_TABLE =
    "CREATE TABLE HAZARD ("+
    "ID          INTEGER NOT NULL "+
    "PRIMARY KEY GENERATED ALWAYS AS IDENTITY "+
    "(START WITH 1, INCREMENT BY 1)," +
    "SYNAME           VARCHAR(50)," +
    "CLASSIFICATION         VARCHAR(40)," +
    "ENVIROMENT      VARCHAR(40)," +
    "EVENT    VARCHAR(100)" +
    "DESCRIPTION    VARCHAR(2000)" +
    "JUSTIFICATION    VARCHAR(2000)" +
    "DEFINITION    VARCHAR(2000)" +
    "SCORE         INTEGER )";

    try{
    c = DBConnect.connect();
    Statement sta = c.createStatement();
    int count = sta.executeUpdate(HAZARD_TABLE);
    System.out.println("table created.");
    sta.close();

    c.close(); 
    }catch(Exception e){
    e.printStackTrace();
    System.out.println("Error on Building Data");             
      }
  }

以下是连接类：

package MAAT;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;

class DBConnect {

private static Connection conn; 
private static String url = "jdbc:derby:testdatabase";  
private static String driver = "org.apache.derby.jdbc.EmbeddedDriver";

public static Connection connect() throws SQLException{ 
    try{
System.setProperty("derby.database.forceDatabaseLock", "true"); 
        Class.forName(driver).newInstance(); 
    }catch(ClassNotFoundException cnfe){ 
        System.err.println("Error: "+cnfe.getMessage()); 
    }catch(InstantiationException ie){ 
        System.err.println("Error: "+ie.getMessage()); 
    }catch(IllegalAccessException iae){ 
        System.err.println("Error: "+iae.getMessage()); 
    } 
    conn = DriverManager.getConnection(url, "username", "password"); 
    return conn; 
} 

public static Connection getConnection() throws SQLException, ClassNotFoundException{ 
    if(conn !=null && !conn.isClosed()) 
        return conn; 
    connect(); 
    return conn; 
}     
}

跟踪：

Executing C:\Users\Brandon\Documents\NetBeansProjects\MAAT\dist\run1950342611\MAAT.jar using platform C:\Program Files\Java\jdk1.8.0_71\jre/bin/java
java.lang.ClassCastException: javafx.scene.control.MenuItem cannot be cast to javafx.scene.Node
at MAAT.MainScreenController.handleButtonAction_newmenu(MainScreenController.java:251)
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:497)
at sun.reflect.misc.Trampoline.invoke(MethodUtil.java:71)
at sun.reflect.GeneratedMethodAccessor1.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:497)
at sun.reflect.misc.MethodUtil.invoke(MethodUtil.java:275)
at javafx.fxml.FXMLLoader$MethodHandler.invoke(FXMLLoader.java:1769)
at javafx.fxml.FXMLLoader$ControllerMethodEventHandler.handle(FXMLLoader.java:1657)
at com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:86)
at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:238)
at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:191)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:58)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java:74)
at com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:49)
at javafx.event.Event.fireEvent(Event.java:198)
at javafx.scene.control.MenuItem.fire(MenuItem.java:462)
at com.sun.javafx.scene.control.skin.ContextMenuContent$MenuItemContainer.doSelect(ContextMenuContent.java:1405)
at com.sun.javafx.scene.control.skin.ContextMenuContent$MenuItemContainer.lambda$createChildren$343(ContextMenuContent.java:1358)
at com.sun.javafx.event.CompositeEventHandler$NormalEventHandlerRecord.handleBubblingEvent(CompositeEventHandler.java:218)
at com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:80)
at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:238)
at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:191)
at com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(CompositeEventDispatcher.java:59)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:58)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java:74)
at com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:54)
at javafx.event.Event.fireEvent(Event.java:198)
at javafx.scene.Scene$MouseHandler.process(Scene.java:3757)
at javafx.scene.Scene$MouseHandler.access$1500(Scene.java:3485)
at javafx.scene.Scene.impl_processMouseEvent(Scene.java:1762)
at javafx.scene.Scene$ScenePeerListener.mouseEvent(Scene.java:2494)
at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:352)
at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:275)
at java.security.AccessController.doPrivileged(Native Method)
at com.sun.javafx.tk.quantum.GlassViewEventHandler.lambda$handleMouseEvent$354(GlassViewEventHandler.java:388)
at com.sun.javafx.tk.quantum.QuantumToolkit.runWithoutRenderLock(QuantumToolkit.java:389)
at com.sun.javafx.tk.quantum.GlassViewEventHandler.handleMouseEvent(GlassViewEventHandler.java:387)
at com.sun.glass.ui.View.handleMouseEvent(View.java:555)
at com.sun.glass.ui.View.notifyMouse(View.java:937)
at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
at com.sun.glass.ui.win.WinApplication.lambda$null$148(WinApplication.java:191)
at java.lang.Thread.run(Thread.java:745)
Error: org.apache.derby.jdbc.EmbeddedDriver
java.sql.SQLException: No suitable driver found for jdbc:derby:MAAWBdatabase
at java.sql.DriverManager.getConnection(DriverManager.java:689)
Error on Building Data
at java.sql.DriverManager.getConnection(DriverManager.java:247)
at MAAT.DBConnect.connect(DBConnect.java:33)
at MAAT.IdThreat_HazardController.OnRelease_hazard(IdThreat_HazardController.java:162)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:497)
at sun.reflect.misc.Trampoline.invoke(MethodUtil.java:71)
at sun.reflect.GeneratedMethodAccessor1.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:497)
at sun.reflect.misc.MethodUtil.invoke(MethodUtil.java:275)
at javafx.fxml.FXMLLoader$MethodHandler.invoke(FXMLLoader.java:1769)
at javafx.fxml.FXMLLoader$ControllerMethodEventHandler.handle(FXMLLoader.java:1657)
at com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:86)
at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:238)
at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:191)
at com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(CompositeEventDispatcher.java:59)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:58)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java:74)
at com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:54)
at javafx.event.Event.fireEvent(Event.java:198)
at javafx.scene.Scene$MouseHandler.process(Scene.java:3757)
at javafx.scene.Scene$MouseHandler.access$1500(Scene.java:3485)
at javafx.scene.Scene.impl_processMouseEvent(Scene.java:1762)
at javafx.scene.Scene$ScenePeerListener.mouseEvent(Scene.java:2494)
at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:352)
at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:275)
at java.security.AccessController.doPrivileged(Native Method)
at com.sun.javafx.tk.quantum.GlassViewEventHandler.lambda$handleMouseEvent$354(GlassViewEventHandler.java:388)
at com.sun.javafx.tk.quantum.QuantumToolkit.runWithoutRenderLock(QuantumToolkit.java:389)
at com.sun.javafx.tk.quantum.GlassViewEventHandler.handleMouseEvent(GlassViewEventHandler.java:387)
at com.sun.glass.ui.View.handleMouseEvent(View.java:555)
at com.sun.glass.ui.View.notifyMouse(View.java:937)
at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
at com.sun.glass.ui.win.WinApplication.lambda$null$148(WinApplication.java:191)
at java.lang.Thread.run(Thread.java:745)

---

那么实际发生了什么？您是否收到任何错误消息？以下是我收到的错误-error:org.apache.derby.jdbc.EmbeddedDriver java.sql.SQLException:找不到适合jdbc的驱动程序：derby:MAAWBdatabase构建数据错误请将您的问题包括完整的堆栈跟踪。数据库已经存在吗？堆栈跟踪已经添加，讨论中的错误开始于@error:org.apache.derby.jdbc.EmbeddedDriver。是的，数据库确实已经存在。看起来您得到了一个

ClassNotFoundException

（如果您在

connect（）

中的catch块中记录了完整的堆栈跟踪，就会看到这个异常）。因此，您没有在类路径中包含derby jar文件。