下面的代码失败了：
Class.forName("oracle.jdbc.driver.OracleDriver");
出现错误：
java.lang.ClassNotFoundException: oracle.jdbc.driver.OracleDriver
两个printlns 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。同样，这个完全相同的类也适用于非 servlet 应用程序。
我已经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，使其简单而简短。
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：
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
- 甲骨文 11g R2
- 视窗 7 64 位