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java - java.lang.NoClassDefFoundError：无法初始化类 oracle.jdbc.driver.ClassRef

问题描述

我在 VM 的服务器和客户端上都有 CentOS。我正在尝试将 Java SE 8 与 Oracle 11gR2 连接起来。但它给出了这个错误。我添加ojdbc6.jar 了"project properties-> libraries -> Add Jar/folder->/usr/java/jdk1.8.0_20/jre/lib/ext/ojdbc6.jar和ojdbc8.jar"。

代码是：

import java.sql.*;
import oracle.sql.*;
import oracle.jdbc.*;
class OracleCon
{
    public static void main(String args[])
{
try
{
    Class.forName("oracle.jdbc.driver.OracleDriver");
   
    Connection con=DriverManager.getConnection("jdbc:oracle:thin:@serverora11gr2:1521:orcl","scott","tiger");

    Statement stmt=con.createStatement();

    ResultSet rs=stmt.executeQuery("select * from emp");
    
    while(rs.next())
    System.out.println(rs.getInt(1)+"  "+rs.getString(2)+"  "+rs.getString(3));

    con.close();

}
catch(Exception e)
{ System.out.println(e);}

}

}

错误是：

  Exception in thread "main" java.lang.NoClassDefFoundError: Could not initialize class oracle.jdbc.driver.ClassRef
at oracle.jdbc.driver.OracleDriver.<clinit>(OracleDriver.java:262)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:259)
at OracleCon.main(OracleCon.java:10)
/home/rahul/.cache/netbeans/8.2/executor-snippets/run.xml:53: Java       
 returned: 1
BUILD FAILED (total time: 0 seconds)

标签： javaoraclejdbc

解决方案

尝试可以从这里下载的最新 JDBC 驱动程序：https ://www.oracle.com/technetwork/database/application-development/jdbc/downloads/index.html 。这个错误应该会消失。

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