java - 错误 :(32, 13) 错误 : cannot access Referenceable class file for javax. 命名。未找到可引用

Question

我得到上面的错误，下面是我的代码我做错了什么？ 对数据源的错误引用。 有什么问题吗？

public class DBConnector {
private Connection dbConn = null;
private FileLogger fileLogger = new FileLogger("./logs/logfile.txt");
private ConfigurationReader conf = new ConfigurationReader("./config.sys");
private Logger logger = fileLogger.getLogger();

/**
 * Attempts to establish a connection with a test MySQL database.
 */
public DBConnector() {


    MysqlDataSource dataSource = new MysqlDataSource();
    dataSource.setUser(conf.getConfigString("username"));
    dataSource.setPassword(conf.getConfigString("password"));
    dataSource.setServerName(conf.getConfigString("dbhost"));
    dataSource.setDatabaseName(conf.getConfigString("dbname"));
    dataSource.setPort(conf.getConfigInt("dbport"));

    try {
        dbConn = dataSource.getConnection();

        logger.info("Succesful connection with database!");
    } catch (Exception ex) {
        logger.info("Error: DBConnector(): problem creating database connection");
    }
    logger.info("Database connection = " + dbConn);
}

Answer 1

我遇到了同样的错误(在 Java 9 或更高版本上)。对我来说，问题是由于我的模块(访问 Referenceable 的模块)的 module-info.java 中缺少 requires java.naming; 指令。添加此指令修复它:

module MyModule {
   requires java.naming;  // Java Naming and Directory Interface (JNDI) API.
   …
}

此模块适用于 Java Naming and Directory Interface (JNDI) API ，如 Module java.naming 的 Javadoc 中所述.