Apache Derby - java.sql.SQLException：无法启动数据库

Posted 2023-02-26

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【中文标题】Apache Derby - java.sql.SQLException：无法启动数据库【英文标题】：Apache Derby - java.sql.SQLException: Failed to start database 【发布时间】：2012-09-21 05:41:06 【问题描述】：

首先，这是我第一次使用 Apache Derby。我正在使用 netbeans，愿意使用嵌入式 apache derby，并按照以下教程配置和安装数据库。然后，我使用项目属性将 derby.jar 文件附加到我的项目中。

http://netbeans.org/kb/docs/ide/java-db.html#starting

附加的图像将在 netbeans 中显示我的数据库状态

我的数据库名称是“联系人”。表名为“FRIENDS”。

以下是我的测试代码

**DatabaseConnector.java**

import java.sql.*;

public class DataBaseConnector

    private Connection con;

    public DataBaseConnector()
    

    

    private void createConnection()
    
        try
        
            Class.forName("org.apache.derby.jdbc.EmbeddedDriver");
            con = DriverManager.getConnection("jdbc:derby:C:/Users/yohan/.netbeans-derby/contact","yohan","xyz");
        
        catch(Exception e)
        
            e.printStackTrace();
        
    

    private void closeConnection()
    
        try
        
            con.close();
        
        catch(Exception e)
        
            e.printStackTrace();
        
    


    public void insertData(int id, String firstName, String lastName)
    
        createConnection();
        try
        
            PreparedStatement ps = con.prepareStatement("insert into FRIENDS values(?,?,?)");
            ps.setInt(1, id);
            ps.setString(1, firstName);
            ps.setString(2, lastName);

            int result = ps.executeUpdate();

            if(result>0)
            
                System.out.println("Data Inserted");
            
            else
            
                System.out.println("Something happened");
            
        
        catch(Exception e)
        
            e.printStackTrace();
        
        finally
        
            closeConnection();

DatabaseUI.java

import java.awt.event.*;
import javax.swing.*;
import java.awt.*;

public class DatabaseUI extends JFrame

    private JLabel firstName, id, lastName;
    private JTextField idTxt, firstNameTxt, lastNameTxt;
    private JButton ok;

    public DatabaseUI()
    
     firstName = new JLabel("First Name: ");
     lastName = new JLabel("Last Name: ");
     id = new JLabel("ID: ");

     firstNameTxt = new JTextField(10);
     lastNameTxt = new JTextField(10);
     idTxt = new JTextField(10);

     ok = new JButton("OK");
     ok.addActionListener(new OKAction());

     JPanel centerPanel = new JPanel();
     centerPanel.setLayout(new GridLayout(4,2));
     centerPanel.add(id);
     centerPanel.add(idTxt);
     centerPanel.add(firstName);
     centerPanel.add(firstNameTxt);
     centerPanel.add(lastName);
     centerPanel.add(lastNameTxt);
     centerPanel.add(new JPanel());
     centerPanel.add(ok);

     getContentPane().add(centerPanel,"Center");


     this.pack();
     this.setVisible(true);


    

    private class OKAction implements ActionListener
    
        public void actionPerformed(ActionEvent ae)
        
            DataBaseConnector db = new DataBaseConnector();

            int id = Integer.parseInt(idTxt.getText());

            db.insertData(id, firstNameTxt.getText().trim(), lastNameTxt.getText().trim());
        
    

    public static void main(String[]args)
    
        new DatabaseUI();

但是，当我尝试将数据插入数据库时，它给了我以下错误

run:
java.sql.SQLException: Failed to start database 'C:/Users/yohan/.netbeans-derby/contact' with class loader sun.misc.Launcher$AppClassLoader@1050169, see the next exception for details.
    at org.apache.derby.impl.jdbc.SQLExceptionFactory40.getSQLException(Unknown Source)
    at org.apache.derby.impl.jdbc.Util.newEmbedSQLException(Unknown Source)
    at org.apache.derby.impl.jdbc.Util.seeNextException(Unknown Source)
    at org.apache.derby.impl.jdbc.EmbedConnection.bootDatabase(Unknown Source)
    at org.apache.derby.impl.jdbc.EmbedConnection.<init>(Unknown Source)
    at org.apache.derby.impl.jdbc.EmbedConnection30.<init>(Unknown Source)
    at org.apache.derby.impl.jdbc.EmbedConnection40.<init>(Unknown Source)
    at org.apache.derby.jdbc.Driver40.getNewEmbedConnection(Unknown Source)
    at org.apache.derby.jdbc.InternalDriver.connect(Unknown Source)
    at org.apache.derby.jdbc.AutoloadedDriver.connect(Unknown Source)
    at java.sql.DriverManager.getConnection(DriverManager.java:579)
    at java.sql.DriverManager.getConnection(DriverManager.java:221)
    at DataBaseConnector.createConnection(DataBaseConnector.java:17)
    at DataBaseConnector.insertData(DataBaseConnector.java:40)
    at DatabaseUI$OKAction.actionPerformed(DatabaseUI.java:53)
    at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2018)
    at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2341)
    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:6504)
    at javax.swing.JComponent.processMouseEvent(JComponent.java:3321)
    at java.awt.Component.processEvent(Component.java:6269)
    at java.awt.Container.processEvent(Container.java:2229)
    at java.awt.Component.dispatchEventImpl(Component.java:4860)
    at java.awt.Container.dispatchEventImpl(Container.java:2287)
    at java.awt.Component.dispatchEvent(Component.java:4686)
    at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4832)
    at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4492)
    at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4422)
    at java.awt.Container.dispatchEventImpl(Container.java:2273)
    at java.awt.Window.dispatchEventImpl(Window.java:2713)
    at java.awt.Component.dispatchEvent(Component.java:4686)
    at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:707)
    at java.awt.EventQueue.access$000(EventQueue.java:101)
    at java.awt.EventQueue$3.run(EventQueue.java:666)
    at java.awt.EventQueue$3.run(EventQueue.java:664)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
    at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:87)
    at java.awt.EventQueue$4.run(EventQueue.java:680)
    at java.awt.EventQueue$4.run(EventQueue.java:678)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
    at java.awt.EventQueue.dispatchEvent(EventQueue.java:677)
    at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:211)
    at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:128)
    at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:117)
    at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:113)
    at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:105)
    at java.awt.EventDispatchThread.run(EventDispatchThread.java:90)
Caused by: java.sql.SQLException: Failed to start database 'C:/Users/yohan/.netbeans-derby/contact' with class loader sun.misc.Launcher$AppClassLoader@1050169, see the next exception for details.
    at org.apache.derby.impl.jdbc.SQLExceptionFactory.getSQLException(Unknown Source)
    at org.apache.derby.impl.jdbc.SQLExceptionFactory40.wrapArgsForTransportAcrossDRDA(Unknown Source)
    ... 51 more
Caused by: java.sql.SQLException: Another instance of Derby may have already booted the database C:\Users\yohan\.netbeans-derby\contact.
    at org.apache.derby.impl.jdbc.SQLExceptionFactory.getSQLException(Unknown Source)
    at org.apache.derby.impl.jdbc.SQLExceptionFactory40.wrapArgsForTransportAcrossDRDA(Unknown Source)
    at org.apache.derby.impl.jdbc.SQLExceptionFactory40.getSQLException(Unknown Source)
    at org.apache.derby.impl.jdbc.Util.generateCsSQLException(Unknown Source)
    ... 48 more
Caused by: ERROR XSDB6: Another instance of Derby may have already booted the database C:\Users\yohan\.netbeans-derby\contact.
    at org.apache.derby.iapi.error.StandardException.newException(Unknown Source)
    at org.apache.derby.impl.store.raw.data.BaseDataFileFactory.privGetJBMSLockOnDB(Unknown Source)
    at org.apache.derby.impl.store.raw.data.BaseDataFileFactory.run(Unknown Source)
    at java.security.AccessController.doPrivileged(Native Method)
    at org.apache.derby.impl.store.raw.data.BaseDataFileFactory.getJBMSLockOnDB(Unknown Source)
    at org.apache.derby.impl.store.raw.data.BaseDataFileFactory.boot(Unknown Source)
    at org.apache.derby.impl.services.monitor.BaseMonitor.boot(Unknown Source)
    at org.apache.derby.impl.services.monitor.TopService.bootModule(Unknown Source)
    at org.apache.derby.impl.services.monitor.BaseMonitor.startModule(Unknown Source)
    at org.apache.derby.iapi.services.monitor.Monitor.bootServiceModule(Unknown Source)
    at org.apache.derby.impl.store.raw.RawStore.boot(Unknown Source)
    at org.apache.derby.impl.services.monitor.BaseMonitor.boot(Unknown Source)
    at org.apache.derby.impl.services.monitor.TopService.bootModule(Unknown Source)
    at org.apache.derby.impl.services.monitor.BaseMonitor.startModule(Unknown Source)
    at org.apache.derby.iapi.services.monitor.Monitor.bootServiceModule(Unknown Source)
    at org.apache.derby.impl.store.access.RAMAccessManager.boot(Unknown Source)
    at org.apache.derby.impl.services.monitor.BaseMonitor.boot(Unknown Source)
    at org.apache.derby.impl.services.monitor.TopService.bootModule(Unknown Source)
    at org.apache.derby.impl.services.monitor.BaseMonitor.startModule(Unknown Source)
    at org.apache.derby.iapi.services.monitor.Monitor.bootServiceModule(Unknown Source)
    at org.apache.derby.impl.db.BasicDatabase.bootStore(Unknown Source)
    at org.apache.derby.impl.db.BasicDatabase.boot(Unknown Source)
    at org.apache.derby.impl.services.monitor.BaseMonitor.boot(Unknown Source)
    at org.apache.derby.impl.services.monitor.TopService.bootModule(Unknown Source)
    at org.apache.derby.impl.services.monitor.BaseMonitor.bootService(Unknown Source)
    at org.apache.derby.impl.services.monitor.BaseMonitor.startProviderService(Unknown Source)
    at org.apache.derby.impl.services.monitor.BaseMonitor.findProviderAndStartService(Unknown Source)
    at org.apache.derby.impl.services.monitor.BaseMonitor.startPersistentService(Unknown Source)
    at org.apache.derby.iapi.services.monitor.Monitor.startPersistentService(Unknown Source)
    ... 48 more
java.lang.NullPointerException
    at DataBaseConnector.insertData(DataBaseConnector.java:43)
    at DatabaseUI$OKAction.actionPerformed(DatabaseUI.java:53)
    at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2018)
    at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2341)
    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:6504)
    at javax.swing.JComponent.processMouseEvent(JComponent.java:3321)
    at java.awt.Component.processEvent(Component.java:6269)
    at java.awt.Container.processEvent(Container.java:2229)
    at java.awt.Component.dispatchEventImpl(Component.java:4860)
    at java.awt.Container.dispatchEventImpl(Container.java:2287)
    at java.awt.Component.dispatchEvent(Component.java:4686)
    at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4832)
    at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4492)
    at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4422)
    at java.awt.Container.dispatchEventImpl(Container.java:2273)
    at java.awt.Window.dispatchEventImpl(Window.java:2713)
    at java.awt.Component.dispatchEvent(Component.java:4686)
    at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:707)
    at java.awt.EventQueue.access$000(EventQueue.java:101)
    at java.awt.EventQueue$3.run(EventQueue.java:666)
    at java.awt.EventQueue$3.run(EventQueue.java:664)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
    at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:87)
    at java.awt.EventQueue$4.run(EventQueue.java:680)
    at java.awt.EventQueue$4.run(EventQueue.java:678)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
    at java.awt.EventQueue.dispatchEvent(EventQueue.java:677)
    at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:211)
    at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:128)
    at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:117)
    at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:113)
    at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:105)
    at java.awt.EventDispatchThread.run(EventDispatchThread.java:90)
java.lang.NullPointerException
    at DataBaseConnector.closeConnection(DataBaseConnector.java:29)
    at DataBaseConnector.insertData(DataBaseConnector.java:65)
    at DatabaseUI$OKAction.actionPerformed(DatabaseUI.java:53)
    at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2018)
    at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2341)
    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:6504)
    at javax.swing.JComponent.processMouseEvent(JComponent.java:3321)
    at java.awt.Component.processEvent(Component.java:6269)
    at java.awt.Container.processEvent(Container.java:2229)
    at java.awt.Component.dispatchEventImpl(Component.java:4860)
    at java.awt.Container.dispatchEventImpl(Container.java:2287)
    at java.awt.Component.dispatchEvent(Component.java:4686)
    at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4832)
    at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4492)
    at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4422)
    at java.awt.Container.dispatchEventImpl(Container.java:2273)
    at java.awt.Window.dispatchEventImpl(Window.java:2713)
    at java.awt.Component.dispatchEvent(Component.java:4686)
    at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:707)
    at java.awt.EventQueue.access$000(EventQueue.java:101)
    at java.awt.EventQueue$3.run(EventQueue.java:666)
    at java.awt.EventQueue$3.run(EventQueue.java:664)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
    at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:87)
    at java.awt.EventQueue$4.run(EventQueue.java:680)
    at java.awt.EventQueue$4.run(EventQueue.java:678)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
    at java.awt.EventQueue.dispatchEvent(EventQueue.java:677)
    at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:211)
    at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:128)
    at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:117)
    at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:113)
    at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:105)
    at java.awt.EventDispatchThread.run(EventDispatchThread.java:90)
BUILD SUCCESSFUL (total time: 12 seconds)

这是为什么？请帮忙！

除了第一个主要问题，我想再问两个问题。

我必须在此处给出数据库的显式位置作为连接。但是，当我把它交给客户时，我该怎么做呢？我必须使用 netbeans 手动启动数据库连接。反正有没有自动启动数据库连接？使用代码？

请帮助我。谢谢

【问题讨论】：

这似乎相关：“另一个 Derby 实例可能已经启动了数据库 C:\Users\yohan\.netbeans-derby\contact。” 是的..但是没有！或者，至少，我不是自己做的！代码有错误吗？ 【参考方案1】：

您的程序包含一些误解和错误分配！

从您的图像中，您可以看到您的 DATABASE = contactDB 不是联系人。 “jdbc:derby:C:/Users/yohan/.netbeans-derby/contact”错误 "jdbc:derby:C:/Users/yohan/.netbeans-derby/contactDB" 现在只有 DB 是正确的。错误： Derby 的另一个实例可能已经启动了数据库 C： \Users\yohan.netbeans-derby\contact.

对于 Con.String，最好不要使用 PATH会起作用 "jdbc:derby://localhost:1527/C:/Users/yohan/.netbeans -derby/contactDB","yohan","xyz"更好的是 "jdbc:derby://localhost:1527/contactDB","yohan","xyz"

最好指定表的完整路径。否则它只能在 Netbeans 中工作，具有已打开的表和默认模式。

准备声明只有 Netbeans 内部 con.prepareStatement("insert into FRIENDS values(?,?,?)");better 是骗局。 prepareStatement("插入到 APP.FRIENDS 值(?,?,?)");

现在看看这个！

    ps.setInt(1, id);
    ps.setString(1, firstName);
    ps.setString(2, lastName);

首先使用 setInt() 设置 id。其次，现在您将 id 设置为 string setString() ( firstName !!!!!!) 最后，您在 ps 中用 lastName 和 lastName 覆盖 firstName。是空的。

这会给你下一个错误

最好，当发生错误时，不要继续运行程序。错误列表会变长。很难读。在您的情况下，第一个错误在 createConnection 中并在 !!

错误创建连接错误 con.prepareStatement("... 错误 ps.executeUpdate() 错误 closeConnection()

用 boolean 和 if 测试它！

private boolean createConnection()

    try
    
        Class.forName("org.apache.derby.jdbc.EmbeddedDriver");
        con = DriverManager.getConnection("jdbc:derby://localhost:1527/contactDB","yohan","xyz");
    
    catch(Exception e)
       
        System.out.println("Error getConnection");
        return false;
    
 return true;

如果连接失败，无需继续运行。

public void insertData(int id, String firstName, String lastName)
    
       if (createConnection()) 
        try
        
            PreparedStatement ps = con.prepareStatement("INSERT INTO APP.FRIENDS values(?,?,?)");
            ps.setInt(1, id);
            ps.setString(2, firstName);
            ps.setString(3, lastName);
[...]

希望对你有所帮助。

【讨论】：

非常感谢您的回复。对此，我真的非常感激。我编辑了它，连接失败！但是，contactDB 是 URL 的名称，而不是数据库的名称。数据库名称是“联系人”。我是按照教程做到的看你的图片--contactDB--APP--FRIENDS 连接失败并出现“ java.sql.SQLException: No适合 jdbc:derby://localhost:1527/C:/Users/yohan/.netbeans-derby/contactDB 的驱动程序” 将库 java DB Driver 添加到您的项目中（属性 -- 库 -- 添加库...）如果您的 Netbeans 中没有库 Java DB Driver 然后手动将 derbyclient.jar 和 derbynet.jar 添加到您的项目中【参考方案2】：

你的datasae已经连接断开右键->断开现在试试，

它肯定会工作。

【讨论】：

这对我有用。我正在运行连接到数据库的 Web 应用程序，但我也无法通过 IDE 连接。但是一旦我停止了应用程序，我就可以从 IDE 连接。如何断开数据库连接？我已经重命名了数据库来解决这个问题，因为我不知道如何停止连接（即使在系统重启后我也遇到了错误，所以我不得不重命名数据库）【参考方案3】：

您的数据库已经连接，您必须断开连接。右键单击->断开连接。现在再试一次，它肯定会起作用。

【讨论】：

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