java我无法让Sqlite数据库与带有Maven的JavaFX应用程序IDE Eclipse包正确通信

Question

我在打包申请时遇到了最大的困难。代码已经完成，我最终使用了带有EclipseMaven插件的JavaFX原型。我在使用数据库时不断出现错误，似乎它不是数据库的完整版本。我可以从firefox转到sqlite数据库管理器，查看users表中的6个用户，但我只能使用其中的3个用户登录，然后它会给我错误，其他表不存在。我现在还收到了其他错误，但我相信它们是由数据库问题引起的。我的登录模型代码是：

public class LoginModel {

String username, userLevel;

Connection connection;

public LoginModel () {

    connection = SqliteConnection.Connector();

    if (connection == null) {

        System.exit(1);
    }
}

public boolean isDbConnected () {

    try {

        return !connection.isClosed();

    } catch (SQLException e) {

        e.printStackTrace();
        return false;

    }
}

public boolean isLogin (String user, String pass) throws SQLException {
    //setUsername(user);
    PreparedStatement preparedStatement = null;
    ResultSet resultSet = null;
    String query = "select * from users where username = ? and password = ?";

    try {
        // This is where the error is occuring
        preparedStatement = connection.prepareStatement(query);

        preparedStatement.setString(1, user);
        preparedStatement.setString(2, pass);
        resultSet = preparedStatement.executeQuery();

        if (resultSet.next()) {
            System.out.println(resultSet);
            userLevel = resultSet.getString(7);
            return true;

        } else {

            return false;

        }
    } catch (SQLException e) {

        System.out.println("Error is an SQLException");
        return false;

    } finally {

        preparedStatement.close();
        resultSet.close();

    }
}

}

我已经评论了错误发生的地方，我已经在之前和之后做了系统输出println，之前显示，之后不显示。它还打印出SQLException，“Error is a SQLException”。在过去的5个小时里，我一直在阅读关于人们所做事情的帖子，我快不知所措了。这似乎需要一个静态连接，而程序的其他部分都不使用静态连接（我有两个数据库连接类）。是否可以将数据库与程序位置保持一致，或者是否需要将其放置在用户硬盘上的某个位置？打包一个程序似乎非常困难，我在学习如何编写代码时轻松多了。请帮忙，谢谢

PrintStackTrace：

Error is an SQLException
Exception in thread "JavaFX Application Thread" java.lang.RuntimeException:     java.lang.reflect.InvocationTargetException
    at javafx.fxml.FXMLLoader$MethodHandler.invoke(FXMLLoader.java:1774)

我试图打印整个stackTrace，但它说我的代码格式不正确。。。 编辑：完成堆栈跟踪

Exception in thread "JavaFX Application Thread" java.lang.RuntimeException:       java.lang.reflect.InvocationTargetException
    at javafx.fxml.FXMLLoader$MethodHandler.invoke(FXMLLoader.java:1774)
    at             javafx.fxml.FXMLLoader$ControllerMethodEventHandler.handle(FXMLLoader.java:1657)
    at     com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventH    andler.java:86)
    at     com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManag    er.java:238)
    at     com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManag    er.java:191)
    at     com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(CompositeEve    ntDispatcher.java:59)
    at     com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.jav    a:58)
    at     com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl    .java:114)
    at     com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.jav    a:56)
    at     com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl    .java:114)
    at     com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.jav    a: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:49)
    at javafx.event.Event.fireEvent(Event.java:198)
    at javafx.scene.Node.fireEvent(Node.java:8411)
    at javafx.scene.control.Button.fire(Button.java:185)
    at     com.sun.javafx.scene.control.behavior.ButtonBehavior.mouseReleased(ButtonBehavio    r.java:182)
    at     com.sun.javafx.scene.control.skin.BehaviorSkinBase$1.handle(BehaviorSkinBase.jav    a:96)
    at     com.sun.javafx.scene.control.skin.BehaviorSkinBase$1.handle(BehaviorSkinBase.jav    a:89)
    at     com.sun.javafx.event.CompositeEventHandler$NormalEventHandlerRecord.handleBubbli    ngEvent(CompositeEventHandler.java:218)
    at     com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventH    andler.java:80)
    at     com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManag    er.java:238)
    at     com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManag    er.java:191)
    at     com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(CompositeEve    ntDispatcher.java:59)
    at     com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.jav    a:58)
    at     com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl    .java:114)
    at     com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.jav    a:56)
    at     com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl    .java:114)
    at     com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.jav    a: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$MouseEventNotification.run(Glass    ViewEventHandler.java:352)
    at     com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(Glass    ViewEventHandler.java:275)
    at java.security.AccessController.doPrivileged(Native Method)
    at     com.sun.javafx.tk.quantum.GlassViewEventHandler.lambda$handleMouseEvent$355(Glas    sViewEventHandler.java:388)
    at     com.sun.javafx.tk.quantum.QuantumToolkit.runWithoutRenderLock(QuantumToolkit.jav    a:389)
    at     com.sun.javafx.tk.quantum.GlassViewEventHandler.handleMouseEvent(GlassViewEventH    andler.java:387)
    at com.sun.glass.ui.View.handleMouseEvent(View.java:555)
    at com.sun.glass.ui.View.notifyMouse(View.java:937)
    at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
    at     com.sun.glass.ui.win.WinApplication.lambda$null$149(WinApplication.java:191)
    at java.lang.Thread.run(Thread.java:745)
    Caused by: java.lang.reflect.InvocationTargetException
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at     sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at     sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.jav    a:43)
    at java.lang.reflect.Method.invoke(Method.java:497)
    at sun.reflect.misc.Trampoline.invoke(MethodUtil.java:71)
    at sun.reflect.GeneratedMethodAccessor1.invoke(Unknown Source)
    at     sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.jav    a:43)
    at java.lang.reflect.Method.invoke(Method.java:497)
    at sun.reflect.misc.MethodUtil.invoke(MethodUtil.java:275)
    at javafx.fxml.FXMLLoader$MethodHandler.invoke(FXMLLoader.java:1769)
    ... 48 more
    Caused by: java.lang.NullPointerException
    at     tolmar.inventory.app.tolmarinventoryapplication.LoginModel.isLogin(LoginModel.ja    va:68)
    at      tolmar.inventory.app.tolmarinventoryapplication.LoginController.Login(LoginContr    oller.java:70)
... 58 more