我的网络托管公司建议我按照getDBConnection()
中的以下内容将“ mysql jdbc connection”详细信息更改为“ mariadb”。
我已经下载了与JDK 1.7兼容的MariaDB jar [mariadb-java-client-1.7.4.jar
],并将jar添加到了项目中。
删除了现有的MySQL jar [mysql-connector-java-5.1.40-bin.jar
],以避免发生任何冲突。清理并构建解决方案,然后重新启动tomcat服务器。提交数据系统时仍然抛出以下错误。同样在进行调试时,我在这里connection = SoccerUtils.getDBConnection(); preparedStatement1 = connection.prepareStatement("insert into mydatabase.registeruser values(default,?,?,?,?,?,?,?,?,?,?,?)",Statement.RETURN_GENERATED_KEYS);
收到null
知道为什么它仍然会引发ClassNotFoundException:com.mysql.jdbc.Driver吗?
java.lang.ClassNotFoundException: com.mysql.jdbc.Driver
Oct 15, 2018 10:53:57 PM org.apache.catalina.core.StandardWrapperValve invoke
SEVERE: Servlet.service() for servlet [RegisterServlet] in context with path [/MyFirstJavaTest] threw exception
java.lang.NullPointerException
at com.myfirstjavatest.pkg.RegisterServlet.addPlayer(RegisterServlet.java:134)
at com.myfirstjavatest.pkg.RegisterServlet.doPost(RegisterServlet.java:110)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:647)
//Code below:
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
public static Connection getDBConnection() {
String url = "jdbc:mariadb://localhost:3307/";
String dbName = "mydatabase";
String driver = "org.mariadb.jdbc.Driver";
String userName = "root";
String password = "mypassword";
Connection conn = null;
try {
Class.forName(driver).newInstance();
conn = DriverManager
.getConnection(url + dbName, userName, password);
} catch (Exception e) {
System.out.println(e);
} finally {
}
return conn;
}