[英]Exception in thread “main” java.lang.ClassNotFoundException: org.apache.derby.jdbc.ClientDriver
My program ever shows these errors when I execute it:我的程序在执行时曾经显示这些错误:
Exception in thread "main" java.lang.ClassNotFoundException: org.apache.derby.jdbc.ClientDriver
at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:264)
at Aula4.main(Aula4.java:13)
Picked up _JAVA_OPTIONS: -Xmx512M
C:\Users\mikae\AppData\Local\NetBeans\Cache\8.2\executor-snippets\run.xml:53: Java returned: 1
My file Aula4
我的文件Aula4
import java.math.BigDecimal;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.Scanner;
/*
* To change this license header, choose License Headers in Project Properties.
* To change this template file, choose Tools | Templates
* and open the template in the editor.
*/
/**
*
* @author mikae
*/
public class Aula4 {
public static void main (String[] args) throws ClassNotFoundException, SQLException {
try {
Class.forName("org.apache.derby.jdbc.ClientDriver");
String url = "jdbc:derby://localhost:1527/sistema_academico";
String usuario = "app";
String senha = "app";
Connection conexao;
Scanner ler = new Scanner(System.in);
int id_aluno;
double nota;
String nome;
int i;
conexao = DriverManager.getConnection(url, usuario, senha);
String sql = "INSERT INTO aluno VALUES (?, ?, ?)";
PreparedStatement stm = conexao.prepareStatement(sql);
ResultSet rs = stm.executeQuery();
System.out.println("Connected!");
for (i=0;i<4;i++) {
System.out.println("Welcome! Type your ID");
id_aluno = ler.nextInt();
System.out.println("Now, type your name");
nome = ler.next();
System.out.println("And finally, type your grade");
nota = ler.nextDouble();
String SQL_Update = "UPDATE aluno SET nota=? WHERE id_aluno=?";
stm = conexao.prepareStatement(SQL_Update);
stm.setLong(1, id_aluno);
stm.setString(2, nome);
stm.setBigDecimal(3, new BigDecimal(nota));
int registros = stm.executeUpdate();
while ( rs.next()) {
id_aluno = rs.getInt("id_aluno");
nome= rs.getString("nome");
nota = rs.getDouble("nota");
}
stm.close();
}
} catch (SQLException ex) {
System.out.println("Connection failed!");
}
}
}
I want to connect my Database.我想连接我的数据库。 I've created my Database and still shows these errors and I'm using Netbeans IDE 8.2.我已经创建了我的数据库,但仍然显示这些错误,我正在使用 Netbeans IDE 8.2。
You need to add the jdbc driver to your java application.您需要将 jdbc 驱动程序添加到您的 java 应用程序中。 If you have a maven project you can add it by adding the following depencency to you pom.xml:如果您有 maven 项目,您可以通过在 pom.xml 中添加以下依赖项来添加它:
<dependency>
<groupId>org.apache.derby</groupId>
<artifactId>derbyclient</artifactId>
<version>10.15.2.0</version>
</dependency>
If you use Netbeans you can download the driver from https://repo1.maven.org/maven2/org/apache/derby/derby/10.15.2.0/ and add it to the poject by following the guide at https://www.foxinfotech.in/2019/03/how-to-add-external-jar-file-in-netbeans-project.html . If you use Netbeans you can download the driver from https://repo1.maven.org/maven2/org/apache/derby/derby/10.15.2.0/ and add it to the poject by following the guide at https://www .foxinfotech.in/2019/03/how-to-add-external-jar-file-in-netbeans-project.html 。
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