ClassNotFoundException oracle.jdbc.driver.OracleDriver 仅在 servlet 中，使用 Eclipse [英] ClassNotFoundException oracle.jdbc.driver.OracleDriver only in servlet, using Eclipse

问题描述

下面的代码失败就行了:

The code below fails on the line:

Class.forName("oracle.jdbc.driver.OracleDriver");

错误:

java.lang.ClassNotFoundException: oracle.jdbc.driver.OracleDriver

java.lang.ClassNotFoundException: oracle.jdbc.driver.OracleDriver

两个println打印:

Wed_Jun_22_11:18:51_PDT_2005
false

这让我觉得这个类存在并且可以找到.这个完全相同的类也适用于非 servlet 应用程序.

This makes me think the class exists and can be found. Also this exact same class works in an a non-servlet application.

我已多次重新启动所有内容并多次重新生成应用程序/servlet.所有值都经过硬编码以使其简单和简短.

I have rebooted everything multiple times and regenerated the application/servlet multiple times. All values have been hard coded to make it simple and short.

private static Connection getDBConnection() throws Exception {
    System.out.println(oracle.jdbc.driver.OracleDriver.BUILD_DATE);
    System.out.println(Class.class.desiredAssertionStatus());
    //load the driver
    Class.forName("oracle.jdbc.driver.OracleDriver");

    return DriverManager.getConnection("jdbc:oracle:thin:@localhost:1521:orcl", "SYSTEM", "pass");
}

失败的完整 servlet:

full servlet that fails:

package servletClass_3;

import java.io.IOException;
import java.sql.Connection;
import java.sql.DriverManager;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * Servlet implementation class OneMoreBookStore
 */
@WebServlet("/OneMoreBookStore")
public class OneMoreBookStore extends HttpServlet {

    private static final long serialVersionUID = 1L;

    /**
     * @see HttpServlet#HttpServlet()
     */
    private static Connection getDBConnection() throws Exception {

        System.out.println(oracle.jdbc.driver.OracleDriver.BUILD_DATE);
        System.out.println(Class.class.desiredAssertionStatus());

        //load the driver
        Class.forName("oracle.jdbc.driver.OracleDriver");
        return DriverManager.getConnection("jdbc:oracle:thin:@localhost:1521:orcl", "SYSTEM", "pass");
    }

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        try
        {
            Connection con = getDBConnection();
        }
        catch (Exception e) {
            e.printStackTrace();
        }
    }

}

此应用程序有效:

package servletClass_3;

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

public class DBConnect {

    private static Connection getDBConnection() throws Exception {
        System.out.println(oracle.jdbc.driver.OracleDriver.BUILD_DATE);
        System.out.println(Class.class.desiredAssertionStatus());

        //load the driver
        Class.forName("oracle.jdbc.driver.OracleDriver");
        return DriverManager.getConnection("jdbc:oracle:thin:@localhost:1521:orcl", "SYSTEM", "pass");
    }
    public static void main(String[] args) {
        try
        {
            Connection con = getDBConnection();
            System.out.println("connection worked");
            con.close();
        }
        catch (Exception e) {
            e.printStackTrace();
        }
    }

}

我正在使用:

• Eclipse JavaEE 1.4.2
• 雄猫 7
• jdk1.7
• Oracle 11g R2
• Windows 7 64 位

推荐答案

可能您没有在应用程序中部署 oracle 驱动程序.

Probably you aren't deploying the oracle driver with your application.

您有多种选择:

• 您可以将驱动程序 jars 放在 WEB-INF/lib 文件夹中
• 您将它与您的应用程序一起导出.-> 右键单击​​项目 -> Build Path-> Configure Build Path... -> Order and Export -> 检查驱动程序.
• 将驱动程序 jar 放在应用程序服务器的共享或库扩展文件夹中.(不过，您应该选择一两个选项.)

• You can place the driver jars in your WEB-INF/lib folder
• You export it with your application. -> Right Click on Project -> Build Path-> Configure Build Path... -> Order and Export -> Check the drivers.
• Place the driver jars in a shared or library extension folder of your application server. (You should go with option one or two though.)

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