Why servlet be called many times?

          I call servlet in jsp by the following way,
          /ReportServlet?reportCode='1234'.
          Servlet execute normally at first,but I find it had been called again before first
          servlet finished.
          I want to know why it be called two times.

Yes,I used two frames in a signle page like this,
          <%@page contentType="text/html;charset=gb2312 "%>
          <%@page errorPage="/fxclear/common/fx_error.jsp"%>
          <%@page session="true" import="cfets_fx2001.clearing.common.record.FxsReport"%>
          <html>
          <head>
          <%
          String reportCode = null;     //要生成报表的report
          code
          try{
               reportCode = request.getParameter("reportcode").trim();
          }catch(NullPointerException e){
               throw new Exception("发给jsp查询参数错误");
          FxsReport report;          //要生成报表的报表信息
          String title;               //报表标题
          String dateFlag = cfets_fx2001.clearing.common.OurReport.getT0ORT1(reportCode);
          try{
               report = new FxsReport(reportCode);
               title = report.reportName.trim();
          }catch(Exception e){
               title = "报表打印";
          %>
          <title>外汇资金清算系统－－帐务子系统－－<%=title%></title>
          <script LANGUAGE="JavaScript">
          //发生错误时执行
          function sendErrMessage(msg)
               middle.location.href="/fxclear/common/fx_clear_error.jsp?Message="+msg;
          //在要生成pdf文件前执行
          //重新在middle frame调用servlet,以获取刚生成的pdf文件
          function beginGenFile()
               middle.document.write("正在生成您要的文件，这需要一些时间，请稍侯...");
               top.document.close();
          //当pdf文件生成成功后执行
          //重新在middle frame调用servlet,以获取刚生成的pdf文件
          function endGenFile()
               middle.location.href="/ReportServlet?reportCode=<%=reportCode%>&dateFlag=<%=dateFlag%>&notrefresh=Y";
          </script>
          </head>
          
          <frameset framespacing="0" border="0" rows="50,101%" frameborder="0">
          <frame name="top" scrolling="no" noresize src="commonprinttitle.jsp?reportcode=<%=reportCode%>&dateFlag=<%=dateFlag%>"
          >
          <frame name="middle" src="/ReportServlet?reportCode=<%=reportCode%>&dateFlag=<%=dateFlag%>"
          scrolling="auto" >
          <noframes>
          <body background="image/fx_cfets.gif" bgproperties="fixed">
          <p>此网页使用了框架，但您的浏览器不支持框架。</p>
          </body>
          </noframes>
          </frameset>
          </html>
          And I want to use frames,how to sovle it?

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A function in a subquery is call too many times.

Dear all,
I'm struggling to understand why a function in a subquery is called too many times.
Let me explain with an example:
create or replace function all_emp (v_deptno in number)
return varchar2
as
v_all_emp varchar2(2000);
begin
    dbms_output.put_line ('function called');
    for i in (select * from emp where deptno = v_deptno) loop
        v_all_emp := v_all_emp || i.ename || '; ';
    end loop;
return v_all_emp;
end;
-- running just the subquery, calls the function all_emp only 4 times (once for each row in table dept)
select
    d.deptno,
    d.dname,
    all_emp(d.deptno) f_all_emp
    from dept d;
-- running the whole query, using regexp to split the value of f_all_emp into separate fields, causes that function all_emp is called 28 times, thus 6 times for each row!!
select tmp.*,
regexp_substr(f_all_emp,'[^;]*',1,1) emp1,
regexp_substr(f_all_emp,'[^;]*',1,3) emp2,
regexp_substr(f_all_emp,'[^;]*',1,5) emp3,
regexp_substr(f_all_emp,'[^;]*',1,7) emp4,
regexp_substr(f_all_emp,'[^;]*',1,9) emp5,
regexp_substr(f_all_emp,'[^;]*',1,11) emp6
from
    (select
    d.deptno,
    d.dname,
    all_emp(d.deptno) f_all_emp
    from dept d) tmp
;I don't understand why Oracle is calling my function 28 times in this example, 4 times should be sufficient.
Is there a way to force that the subquery is materialized first?
Little background:
Above function / query is of course a simple example.
Actually I have pretty complex function, embedding in a subquery.
The subquery is already slow (2 min to run), but when I want to split the result of the funciton in multiple (approx 20) fields it's over an hour due to above described behaviour.

Optimizer merges in-line view and query results in:
select d.deptno,
        d.dname,
        all_emp(d.deptno) f_all_emp
        regexp_substr(all_emp(d.deptno),'[^;]*',1,1) emp1,
        regexp_substr(all_emp(d.deptno),'[^;]*',1,3) emp2,
        regexp_substr(all_emp(d.deptno),'[^;]*',1,5) emp3,
        regexp_substr(all_emp(d.deptno),'[^;]*',1,7) emp4,
        regexp_substr(all_emp(d.deptno),'[^;]*',1,9) emp5,
        regexp_substr(all_emp(d.deptno),'[^;]*',1,11) emp6
from dept d
/That's why function is called 28 times. We can see it from explain plan:
SQL> explain plan for
2 select tmp.*,
3          regexp_substr(f_all_emp,'[^;]*',1,1) emp1,
4          regexp_substr(f_all_emp,'[^;]*',1,3) emp2,
5          regexp_substr(f_all_emp,'[^;]*',1,5) emp3,
6          regexp_substr(f_all_emp,'[^;]*',1,7) emp4,
7          regexp_substr(f_all_emp,'[^;]*',1,9) emp5,
8          regexp_substr(f_all_emp,'[^;]*',1,11) emp6
9    from (
10           select d.deptno,
11                   d.dname,
12                   all_emp(d.deptno) f_all_emp
13             from dept d
14          ) tmp
15 /
Explained.
SQL> @?\rdbms\admin\utlxpls
PLAN_TABLE_OUTPUT
Plan hash value: 3383998547
| Id | Operation         | Name | Rows | Bytes | Cost (%CPU)| Time     |
|   0 | SELECT STATEMENT |      |     4 |    52 |     3   (0)| 00:00:01 |
|   1 | TABLE ACCESS FULL| DEPT |     4 |    52 |     3   (0)| 00:00:01 |
8 rows selected.
SQL> If we use NO_MERGE hint:
SQL> select /*+ NO_MERGE(tmp) */
2          tmp.*,
3          regexp_substr(f_all_emp,'[^;]*',1,1) emp1,
4          regexp_substr(f_all_emp,'[^;]*',1,3) emp2,
5          regexp_substr(f_all_emp,'[^;]*',1,5) emp3,
6          regexp_substr(f_all_emp,'[^;]*',1,7) emp4,
7          regexp_substr(f_all_emp,'[^;]*',1,9) emp5,
8          regexp_substr(f_all_emp,'[^;]*',1,11) emp6
9    from (
10           select d.deptno,
11                   d.dname,
12                   all_emp(d.deptno) f_all_emp
13             from dept d
14          ) tmp
15 /
    DEPTNO DNAME          F_ALL_EMP EMP1       EMP2       EMP3       EMP4       EMP5       EMP6
        10 ACCOUNTING     CLARK; KIN CLARK       KING       MILLER
                          G; MILLER;
        20 RESEARCH       SMITH; JON SMITH       JONES      SCOTT      ADAMS      FORD
                          ES; SCOTT;
                           ADAMS; FO
                          RD;
        30 SALES          ALLEN; WAR ALLEN       WARD       MARTIN     BLAKE      TURNER     JAMES
                          D; MARTIN;
    DEPTNO DNAME          F_ALL_EMP EMP1       EMP2       EMP3       EMP4       EMP5       EMP6
                           BLAKE; TU
                          RNER; JAME
                          S;
        40 OPERATIONS
function called
function called
function called
function called
function called
function called
SQL> explain plan for
2 select /*+ NO_MERGE(tmp) */
3          tmp.*,
4          regexp_substr(f_all_emp,'[^;]*',1,1) emp1,
5          regexp_substr(f_all_emp,'[^;]*',1,3) emp2,
6          regexp_substr(f_all_emp,'[^;]*',1,5) emp3,
7          regexp_substr(f_all_emp,'[^;]*',1,7) emp4,
8          regexp_substr(f_all_emp,'[^;]*',1,9) emp5,
9          regexp_substr(f_all_emp,'[^;]*',1,11) emp6
10    from (
11           select d.deptno,
12                   d.dname,
13                   all_emp(d.deptno) f_all_emp
14             from dept d
15          ) tmp
16 /
Explained.
SQL> @?\rdbms\admin\utlxpls
PLAN_TABLE_OUTPUT
Plan hash value: 2317111044
| Id | Operation          | Name | Rows | Bytes | Cost (%CPU)| Time     |
|   0 | SELECT STATEMENT   |      |     4 | 8096 |     3   (0)| 00:00:01 |
|   1 | VIEW              |      |     4 | 8096 |     3   (0)| 00:00:01 |
|   2 |   TABLE ACCESS FULL| DEPT |     4 |    52 |     3   (0)| 00:00:01 |
9 rows selected.
SQL> Not sure why function is executed 6 and not 4 times. What we actually want is to materialize in-line view:
SQL> with tmp as (
2               select /*+ materialize */
3                       d.deptno,
4                       d.dname,
5                       all_emp(d.deptno) f_all_emp
6                 from dept d
7              )
8 select tmp.*,
9          regexp_substr(f_all_emp,'[^;]*',1,1) emp1,
10          regexp_substr(f_all_emp,'[^;]*',1,3) emp2,
11          regexp_substr(f_all_emp,'[^;]*',1,5) emp3,
12          regexp_substr(f_all_emp,'[^;]*',1,7) emp4,
13          regexp_substr(f_all_emp,'[^;]*',1,9) emp5,
14          regexp_substr(f_all_emp,'[^;]*',1,11) emp6
15    from tmp
16 /
    DEPTNO DNAME          F_ALL_EMP EMP1       EMP2       EMP3       EMP4       EMP5       EMP6
        10 ACCOUNTING     CLARK; KIN CLARK       KING       MILLER
                          G; MILLER;
        20 RESEARCH       SMITH; JON SMITH       JONES      SCOTT      ADAMS      FORD
                          ES; SCOTT;
                           ADAMS; FO
                          RD;
        30 SALES          ALLEN; WAR ALLEN       WARD       MARTIN     BLAKE      TURNER     JAMES
                          D; MARTIN;
    DEPTNO DNAME          F_ALL_EMP EMP1       EMP2       EMP3       EMP4       EMP5       EMP6
                           BLAKE; TU
                          RNER; JAME
                          S;
        40 OPERATIONS
function called
function called
function called
function called
SQL> explain plan for
2 with tmp as (
3               select /*+ materialize */
4                       d.deptno,
5                       d.dname,
6                       all_emp(d.deptno) f_all_emp
7                 from dept d
8              )
9 select tmp.*,
10          regexp_substr(f_all_emp,'[^;]*',1,1) emp1,
11          regexp_substr(f_all_emp,'[^;]*',1,3) emp2,
12          regexp_substr(f_all_emp,'[^;]*',1,5) emp3,
13          regexp_substr(f_all_emp,'[^;]*',1,7) emp4,
14          regexp_substr(f_all_emp,'[^;]*',1,9) emp5,
15          regexp_substr(f_all_emp,'[^;]*',1,11) emp6
16    from tmp
17 /
Explained.
SQL> @?\rdbms\admin\utlxpls
PLAN_TABLE_OUTPUT
Plan hash value: 634594723
| Id | Operation                  | Name                       | Rows | Bytes | Cost (%CPU)| Time     |
|   0 | SELECT STATEMENT           |                            |     4 | 8096 |     5   (0)| 00:00:01 |
|   1 | TEMP TABLE TRANSFORMATION |                            |       |       |            |          |
|   2 |   LOAD AS SELECT           |                            |       |       |            |          |
|   3 |    TABLE ACCESS FULL       | DEPT                       |     4 |    52 |     3   (0)| 00:00:01 |
|   4 |   VIEW                     |                            |     4 | 8096 |     2   (0)| 00:00:01 |
|   5 |    TABLE ACCESS FULL       | SYS_TEMP_0FD9D6603_20255AE |     4 |    52 |     2   (0)| 00:00:01 |
PLAN_TABLE_OUTPUT
12 rows selected.
SQL> However, hint MATERIALIZE is an undocumented hint.
SY.

Problem adding listners(getting called multiple times)??

Hi
I got a small doubt,
If I have two radio buttons, if I implement item listeners on that two radio buttons ,
Depending on the value I get from the database I set it to be selected , but the question is why is the item listener called many times when I write
This code is written in one item listener --universal radio button.
Universalbtn.addItemListener(new ItemListener()
Public itemStateChange(){
//Some processing from the database
if(type=�P�)
Partialbtn.setSelected(true);
Else if (type=�S�)
Sparebtn.setSelected(true);
)Here�s the exact code �
objUniversalRadBtn.addItemListener(new ItemListener() {
                                    public void itemStateChanged(ItemEvent iE) {
                                                arrStoreFamilyList=new ArrayList();
                                                ArrayList arrResults=null;
                                                arrStoreFamilyList.add(FLAG_RADIO_BTN);
                                                try {
                                                            //calling the service, to store the values selected or entered in UI.
                                                            arrResults=(ArrayList)objController.doAction
                                                                                                            ("admininvmgmnt.service", arrStoreFamilyList);
                                                catch(EnPVException enPV) {
                                                            logger.error("exception"+enPV);
                                                if(arrResults.get(0).equals(BOOLEAN_VALUE)) {
                                                            objMessageUI=new MessageUI();
                                                            objMessageUI.infoMessage(INVENTORY_CYCLE_INPROGRESS);
                                                            if(strInvType.equals(INVENTORYTYPE_PARTIAL)) {
                                                                        objPartialRadBtn.setSelected(true);
                                                            }else {
                                                                        objSpareRadBtn.setSelected(true);
                                                }else {
                                                objAddedFamilyList.setEnabled(false);
                                                objFamilyName.setEnabled(false);
                                                objFamilyTxt.setEnabled(false);
                                                objAddBtn.setEnabled(false);
                                                objRemoveBtn.setEnabled(false);
                                                objInvMgmtUI=null;
                        objSpareRadBtn.addItemListener(new ItemListener() {
                                    public void itemStateChanged(ItemEvent iE) {
                                                arrStoreFamilyList=new ArrayList();
                                                ArrayList arrResults=null;
                                                arrStoreFamilyList.add(FLAG_RADIO_BTN);
                                                try {
                                                            //calling the service, to store the values selected or entered in UI.
                                                            arrResults=(ArrayList)objController.doAction
                                                                                                            ("admininvmgmnt.service", arrStoreFamilyList);
                                                catch(EnPVException enPV) {
                                                            logger.error("exception"+enPV);
                                                if(arrResults.get(0).equals(BOOLEAN_VALUE)) {
                                                            objMessageUI=new MessageUI();
                                                            objMessageUI.infoMessage(INVENTORY_CYCLE_INPROGRESS);
                                                            System.out.println(strInvType);
                                                            if(strInvType.equals(INVENTORYTYPE_UNIVERSAL)) {
                                                                        bFlag=false;
                                                                        objUniversalRadBtn.setSelected(true);
                                                            }else if(strInvType.equals(INVENTORYTYPE_PARTIAL)) {
                                                                        objPartialRadBtn.setSelected(true);
                                                }else {
                                                objAddedFamilyList.setEnabled(false);
                                                objFamilyName.setEnabled(false);
                                                objFamilyTxt.setEnabled(false);
                                                objAddBtn.setEnabled(false);
                                                objRemoveBtn.setEnabled(false);
                                                objInvMgmtUI=null;
                        });Pls kindly , let me know why is this happening , as I had overcomed this problem many times and I changed my code when this happened with the textfields in some cases � (when I wrote focuslost events on textboxes , the same case happened �calling the other listener many times and then the cursor got focused in the textfield)
thnx & regards
Neel

Inside the Method itemStateChanged() dont use
objPartialRadBtn.setSelected() or objSpareRadBtn.setSelected()
If you still want to use then do
objPartialRadBtn.removeItemListener(...);
objPartialRadBtn.setSelected();
objPartialRadBtn.addItemListener(...);

How many times can i call the start()

Hi All:
I would like to know how many time you can actually call the start(),
cuz my app is doing some really strange things,
here is a fragament of my code:
private void spawnThreads()
ListIterator it = _vWorker.listIterator();
while ( it.hasNext() ) {
ClientWorker client_worker = (ClientWorker) it.next();
client_worker.start();
ClientWorker is another Thread, and in the run() of the ClientWorker, I have
public void run() {
Runtime rt = Runtime.getRuntime();
     try {
     // Start the timer
     Process child = rt.exec(_fileName);
     // gobble any error or output streams
StreamGobbler errorGobbler = new
StreamGobbler(child.getErrorStream(), "ERROR");
StreamGobbler outputGobbler = new
StreamGobbler(child.getInputStream(), "OUTPUT");
errorGobbler.start();
outputGobbler.start();
child.waitFor();
                                        } catch (IOException e) {
               System.err.println("IOException starting process!");
          } catch (InterruptedException e) {
               System.err.println("Interrupted waiting for process!");
I have a couple of cmd files to execute, so This spawnThreads() will be called a couple of times,and the funny thing is , it will execute the first cmd files, and that is it, it won't execute the 2nd or the 3rd cmd files, it will start the thread, but then the run()won't actually gets invoked,,,so I am just wondering if anyone of you has encountered this problem, perhaps you could lend me some insight on this?
thanks,

Yes, you can run the start() of a Thread more than once,
here is my Test App,
public static void main(String[] args) throws Exception {
Vector vec = new Vector();
for (int i=0;i<4;i++){
ClientThread ct = new ClientThread();
vec.add(ct);
ListIterator it = vec.listIterator();
while(it.hasNext()){
ClientThread ct = (ClientThread)it.next();
ct.start();
and as you have already guessed it the run() of ClientThread simply does system.out.println()
and here is the output
run started
run started
run started
run started
so..yeah..I don't really have any idea what is happening to my app and why it is not executing any cmd files after executing the very first cmd file

Why servlet be called many times?

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