apache-flex - 无法创建类型为 'some class' 的新实例。如果没有公共(public)、无参数的构造函数，则无法实例化类型

Question

我有一个类，其中包含构造函数和重载方法。当我尝试使用 blazeds 导入该类时，我收到一条错误消息

[RPC Fault faultString="Unable to create a new instance of type 'some class'." faultCode="Server.ResourceUnavailable"
faultDetail="Types cannot be instantiated without a public, no arguments constructor."]

如何使用 blazeds 导入具有重载方法的类

Answer 1

您必须提供“无参数”构造函数。请参阅Converting data from ActionScript to Java .

public class SomeClass
{
    // no-args constructor is required for BlazeDS
    public SomeClass() {}

    public SomeClass(int arg) {}
}

public class SomeService
{
    public Connection getConnection()
    {
        // implement to create or get a connection
    }

    public void saveSomeClass(SomeClass sc) throws SQLException
    {
        Connection conn = getConnection();
        Statement stmt = conn.createStatement();
        String sql = "INSERT INTO some_table (...) VALUES (...)";
        stmt.executeUpdate(sql);
        stmt.close();
    }
}