我尝试在eclipse中运行以下代码

public static void main(String[] args) {
    Connection connection = null;  
    ResultSet resultSet = null;  
    Statement statement = null;  

    try {  
        Class.forName("org.hsqldb.jdbcDriver");  
        connection = DriverManager.getConnection("jdbc:hsqldb:hsql://localhost/URLAccess", "SA", "");  
        statement = connection.createStatement();  
        resultSet = statement.executeQuery("SELECT referrer FROM Access");  
        while (resultSet.next()) {  
            System.out.println("referrer : "+ resultSet.getString("referrer"));  
        }  
    } catch (Exception e) {  
        e.printStackTrace();  
    } finally {  
        try {  
            resultSet.close();  
            statement.close();  
            connection.close();  
        } catch (Exception e) {  
            e.printStackTrace();  
        }  
    }  
}

但我有以下例外谁能建议。。。

java.sql.SQLException: socket creation error
    at org.hsqldb.jdbc.Util.sqlException(Unknown Source)
    at org.hsqldb.jdbc.jdbcConnection.<init>(Unknown Source)
    at org.hsqldb.jdbcDriver.getConnection(Unknown Source)
    at org.hsqldb.jdbcDriver.connect(Unknown Source)
    at java.sql.DriverManager.getConnection(DriverManager.java:582)
    at java.sql.DriverManager.getConnection(DriverManager.java:185)
    at testdriver.Hsqldb.main(Hsqldb.java:20)
java.lang.NullPointerException
    at testdriver.Hsqldb.main(Hsqldb.java:30)

我要做的是运行这个查询来获取我的hypersqldb中的表（access）的详细信息，当我试图运行上面的代码时，我得到了上面的异常。
请在这方面给予帮助。期待您的解决方案。