UcanaccessDriver引发ExceptionInInitializerError原因:java.lang.RuntimeException:org.hsqldb.jdbc.JDBCDriver [英] UcanaccessDriver throws ExceptionInInitializerError Caused by: java.lang.RuntimeException: org.hsqldb.jdbc.JDBCDriver

问题描述

我在所有可能的地方都进行了检查，包括该页面，但在Netbeans 8和Ucanaccess上我一直收到奇怪的错误消息.

I checked everywhere i could and including this page but i keep getting weird error on Netbeans 8 and Ucanaccess.

这是我首先要做的.导入了org-apache-commons-logging.jar，ucanaccess-2.0.9.jar，commons-lang-2.6.jar，hsqldb.jar，jackcess-2.0.4.jar作为新驱动程序.

Here is what i did first. Imported org-apache-commons-logging.jar, ucanaccess-2.0.9.jar, commons-lang-2.6.jar, hsqldb.jar, jackcess-2.0.4.jar as a new driver.

在Netbeans中的选项下设置类路径(添加了ucanaccess.zip文件)

Set the class path under options in Netbeans (added the ucanaccess.zip file)

import sun.jdbc.odbc.JdbcOdbcDriver;
import net.ucanaccess.jdbc.UcanaccessDriver;
import java.sql.*;
import java.util.Scanner;
import java.util.logging.Level;
import java.util.logging.Logger;
public class JavaApplication7 {

static final String JDBC_DRIVER = "net.ucanaccess.jdbc.UcanaccessDriver";
static final String DB_URL = "jdbc:ucanaccess://C:\\Users\\Magneto\\Documents\\Database1.mdb";
static final String USER = "";
static final String PASS = "";
static final Scanner in = new Scanner(System.in);
//insert data variables
public JavaApplication7() throws SQLException {
}
public static void main(String[] args){

// databaseForm dbf = new databaseForm();
// dbf.setVisible(true);
 getDatabase();
}

public static void connectToDatabase()
{
try{
System.out.println("Connection Successfull");
System.out.println("----------------------------------------------");
}
catch(Exception e)
{

}
}
public static void getDatabase()
{
try {
Class.forName(JDBC_DRIVER);
Statement statement = null;
Connection con = DriverManager.getConnection(DB_URL, "", "");
//execute a query
statement = con.createStatement();
String sql = "Select id, FirstName, LastName FROM PhoneBook";
ResultSet rs = statement.executeQuery(sql);
//pull database
while(rs.next())
{
int id = rs.getInt("id");
String FirstName = rs.getString("FirstName");
String LastName = rs.getString("LastName");

System.out.println("id " + id + " FirstName " + FirstName + " LastName " + LastName);   
}
rs.close();
con.close();
} catch (Exception ex) {
System.out.println("Got an Exception!");
System.err.println(ex.getMessage());
}
}

这是我不断得到的错误:

And here is the error I keep getting:

Exception in thread "main" java.lang.ExceptionInInitializerError
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:188)
at javaapplication7.JavaApplication7.getDatabase(JavaApplication7.java:54)
at javaapplication7.JavaApplication7.main(JavaApplication7.java:34)
Caused by: java.lang.RuntimeException: org.hsqldb.jdbc.JDBCDriver
at net.ucanaccess.jdbc.UcanaccessDriver.<clinit>(UcanaccessDriver.java:56)
... 4 more

Java结果:1

推荐答案

该异常起源于net.ucanaccess.jdbc.UcanaccessDriver的类初始化程序:

The exception originates in the class initializer of net.ucanaccess.jdbc.UcanaccessDriver:

原因:java.lang.RuntimeException: org.hsqldb.jdbc.JDBCDriver

根据 UCanAccess网站，UCanAccess取决于HSQLDBC:

According to the UCanAccess site, UCanAccess depends on HSQLDBC:

依赖项

UCanAccess 2.x.x(至少)在类路径中需要以下依赖项:

Dependencies

UCanAccess 2.x.x requires (at least) the following dependencies in your classpath:

• jackcess-2.0.0.jar或更高版本
  • commons-lang-2.4.jar
  • commons-logging-1.0.4.jar
  • jackcess-2.0.0.jar or later
    • commons-lang-2.4.jar
    • commons-logging-1.0.4.jar

    您可能尚未在应用程序的类路径中包含HSQLDB库.在Netbeans中定义驱动程序纯粹是为了在Netbeans中使用该驱动程序，而不是用于应用程序的类路径.

    You probably haven't included the HSQLDB library on the classpath of the application. Defining a driver in Netbeans is purely for use of the driver in Netbeans, not for the classpath of an application.

    如以下评论中的Gord Thompson所述，可以在以下问题中找到有关设置UCanAccess的说明:

    As mentioned by Gord Thompson in the comment below, an explanation of setting up UCanAccess can be found in this question: Manipulating an Access database from Java without ODBC

    这篇关于UcanaccessDriver引发ExceptionInInitializerError原因:java.lang.RuntimeException:org.hsqldb.jdbc.JDBCDriver的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！