我做了一個簡單的Java EE應用程序,我有一個與數據庫連接的問題。 在eclipse中一切正常,但是當我在Intellij中嘗試相同的錯誤時發生。java.lang.ClassNotFoundException:在IntelliJ中com.mchange.v2.c3p0.ComboPooledDataSource,雖然它在Eclipse中工作正常
package db;
import com.mchange.v2.c3p0.ComboPooledDataSource;
import java.beans.PropertyVetoException;
import java.sql.Connection;
import java.sql.SQLException;
public class DbUtil {
private static DbUtil dbUtil;
private ComboPooledDataSource connectionPool;
private DbUtil() throws PropertyVetoException {
connectionPool = new ComboPooledDataSource();
connectionPool.setDriverClass("com.mysql.jdbc.Driver");
connectionPool.setJdbcUrl("jdbc:mysql://localhost:3306/world");
connectionPool.setUser("root");
connectionPool.setPassword("root");
connectionPool.setInitialPoolSize(5);
connectionPool.setMinPoolSize(5);
connectionPool.setMaxPoolSize(20);
connectionPool.setAcquireIncrement(5);
connectionPool.setMaxIdleTime(3600);
}
public Connection getConnection() throws SQLException {
return connectionPool.getConnection();
}
public void close() {
connectionPool.close();
}
public static DbUtil getInstance() {
if (dbUtil == null) {
try {
dbUtil = new DbUtil();
} catch (PropertyVetoException e) {
e.printStackTrace();
}
}
return dbUtil;
}
}
在項目結構 - >庫我有: image
,並且錯誤是:
java.lang.NoClassDefFoundError: com/mchange/v2/c3p0/ComboPooledDataSource
java.lang.ClassNotFoundException: com.mchange.v2.c3p0.ComboPooledDataSource
如果這些「庫」表示jar文件的圖像中,起碼你還需要mchange公地-JAVA版的罐子0.2.11以上。 –