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[英]Maven - java.lang.ClassNotFoundException: com.mysql.jdbc.Driver
[英]Maven java.lang.ClassNotFoundException: com.mysql.jdbc.Driver
我是java的新手,我使用maven創建了項目。 我有一個看起來像這樣的pom.xml
文件
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.swingy.app</groupId>
<artifactId>swingy</artifactId>
<version>1.0-SNAPSHOT</version>
<name>swingy</name>
<!-- FIXME change it to the project's website -->
<url>http://maven.apache.org</url>
<packaging>jar</packaging>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<maven.compiler.source>1.7</maven.compiler.source>
<maven.compiler.target>1.7</maven.compiler.target>
</properties>
<dependencies>
<dependency>
<groupId>com.oracle</groupId>
<artifactId>ojdbc14</artifactId>
<version>10.2.0.2.0</version>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.11</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.36</version>
</dependency>
</dependencies>
</project>
而且我的主要Java程序看起來像這樣
package com.swingy.app;
import java.sql.*;
public class App {
static Connection conn = null;
static PreparedStatement pStatement = null;
public static void main(String[] args) {
makeJDBCConnection();
}
private static void makeJDBCConnection() {
try {
Class.forName("com.mysql.jdbc.Driver");
} catch (ClassNotFoundException e) {
e.printStackTrace();
return;
}
try {
conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/", "root", "Pass");
if (conn != null) {
System.out.println("Connection Successful! Enjoy. Now it's time to push data");
} else {
System.out.println("Failed to make connection!");
}
} catch (SQLException e) {
System.out.println("MySQL Connection Failed!");
e.printStackTrace();
return;
}
}
}
這可以使用mvn clean package
正確編譯,然后當我嘗試使用java -jar target/swingy-1.0-SNAPSHOT.jar
運行時,出現此錯誤
java.lang.ClassNotFoundException:com.mysql.jdbc.Driver
我到處都在尋找答案,大多數文章建議我"add the .jar file"
到我的類路徑中,但是我不知道這可能意味着什么,因為我嘗試過的所有事情都喜歡將.jar
文件下載到項目路徑中,依然沒有。 我正在使用vscode,這是我的項目樹結構
.
├── pom.xml
├── src
│ ├── main
│ │ └── java
│ │ └── com
│ │ └── swingy
│ │ ├── app
│ │ │ ├── App.java
│ │ │ └── Main.java
│ │ ├── controls
│ │ ├── models
│ │ │ └── Player.java
│ │ └── views
│ │ └── Colors.java
│ └── test
│ └── java
│ └── com
│ └── swingy
│ └── app
│ └── AppTest.java
└── target
├── classes
...
您需要在最終的jar中添加依賴項,這可以由maven使用以下插件完成:
<build>
<plugins>
<plugin>
<artifactId>maven-assembly-plugin</artifactId>
<executions>
<execution>
<phase>package</phase>
<goals>
<goal>single</goal>
</goals>
</execution>
</executions>
<configuration>
<descriptorRefs>
<descriptorRef>jar-with-dependencies</descriptorRef>
</descriptorRefs>
<archive>
<manifest>
<mainClass>com.swingy.app.App</mainClass>
</manifest>
</archive>
</configuration>
</plugin>
</plugins>
要運行您的項目,可以使用以下命令:
java -jar target/swingy-1.0-SNAPSHOT-jar-with-dependencies.jar
我希望這個對你有用 :)
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