EJB paramenters 传递的有关问题

EJB paramenters 传递的问题
最近写了一个结构类型的类，在EJB 中运用，但是再运行的时候网页上弹出的结果是   IOException  sharling EJB paramenters 后台没报任何错误  想问问大神们，是不是我对JAVA 参数传递的理解有问题，还是对EJB 的理解有问题。下面是我的源代码。

ublic class MethodResult {

    public boolean Success;
    public String Message;
    public Object Data;

    public MethodResult() {
        // <editor-fold defaultstate="collapsed" desc="Compiled Code">
        /* 0: aload_0
         * 1: invokespecial java/lang/Object."<init>":()V
         * 4: aload_0
         * 5: iconst_0
         * 6: putfield      com/rcb/MethodResult.Success:Z
         * 9: aload_0
         * 10: ldc
         * 12: putfield      com/rcb/MethodResult.Message:Ljava/lang/String;
         * 15: aload_0
         * 16: aconst_null
         * 17: putfield      com/rcb/MethodResult.Data:Ljava/lang/Object;
         * 20: return
         *  */
        // </editor-fold>
    }
}

public interface DB2Operate {



    public MethodResult Query(String  tabename);

    // Add business logic below. (Right-click in editor and choose
    // "Insert Code > Add Business Method")
}

public class DB2Operatebean implements DB2Operate{
public MethodResult Query(String  tabename)
{
  // List Querylist=null;
    MethodResult sr=new  MethodResult();
    List dblist=null;

       Boolean blopen= dbu.Open("db2");//自己写的类的方法链接数据库
       String c="*";
       if(blopen==true)
       {


           sr.Data=dbu.SelectData(tabename, c, "1=1", dblist);
           if ( sr.Data==null ) sr.Success=false;
           else sr.Success=true;
           sr.Message=dbu.GetErrMessage();
           //sr.Data=dblist;
       }


    dbu.Close();// 关闭数据库
    System.out.println( sr.Success );
    return sr;

}

}

JSP网页
<html>
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
        <title>DB2Operate</title>
    </head>
    <body>
        <table >
            <tr>
                <th>ID</th>
                <th>姓名</th>
                <th>地址</th>
                <th>电话</th>

            </tr>
            <tr>


        <%
            try
            {

EJB paramenters 传递的有关问题

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