Speeding up jsp

Speeding up jsp
Posted: Aug 4, 2004 1:07 PM Reply
Hello, I'd like to know about ways to speed up a java application.
We're using jsp java beans on a webserver running Apache/Tomcat 4.1.18.
It's accessing database information through ODBC from a Microsoft SQL Server
version 8.0 database across a network. We're encountering some problems
with one jsp page because I think it's retrieving many result sets from
the database. The queries in question select from several lookup tables and out.prinln the results
to several select html tags. We're using JDBC, and limiting our select to the minimum numer of database
columns.
Any recommendations about speeding up the specific problem with this jsp
page, or any general suggestions on performance improvements would be
welcome.
Mike

As said, the database should do as much as possible, including caching of the query results.
If the database and the web server are separated by a network, and there is latency in this connection, then you should also avoid roundtrips.
You could consider for each page having just one roundtrip by having the database server provide the data, not as separate query results, but as single documents or data structures.
That is, you could implement a web-service interface or an enterprise java beans interface as the point of access to your data. The web layer would then call remote functions and get the necessary data structures for each view.
But this would be a misuse of web-services and EJB because you would be mixing the presentaion logic with the business logic. You would have half of the presentation layer "remoted" (bad, and difficult to maintain).
So, even if there are slowness problems, I think you should try to isolate the presentation layer as much as possible, even if it involves many roundtrips. So, investigate the follwing possibilities:
1. Optimizing the SQL code.
2. Network issues: where is it taking the time?

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<TD align='center'> FAONTIMECOMPLIANCE </TD><TD align='center'> Daily </TD><TD align='left'> 7/15/04 2:44 PM </TD><TD align='left'> 7/15/04 2:47 PM </TD><TD align='center'> SUCCESS </TD><TD align='left'>   </TD>
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<TD align='center'> FAPAYROLLLOCS </TD><TD align='center'> WEEKLY </TD><TD align='left'> 6/18/04 4:30 PM </TD><TD align='left'> 6/18/04 4:30 PM </TD><TD align='center'> SUCCESS </TD><TD align='left'> RESTART THE PROCESS </TD>
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<tr bgcolor="#FFFFFF">
<TD align='center'> FAPROCESS </TD><TD align='center'> Daily </TD><TD align='left'> 6/23/04 4:00 AM </TD><TD align='left'> 6/23/04 4:02 AM </TD><TD align='center'> SUCCESS </TD><TD align='left'> RESTART THE PROCESS </TD>
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<tr bgcolor="#FFFFFF">
<TD align='center'> FATIMESHEET </TD><TD align='center'> WEEKLY </TD><TD align='left'> 6/18/04 4:30 PM </TD><TD align='left'> 6/18/04 4:39 PM </TD><TD align='center'> SUCCESS </TD><TD align='left'> CLEAR DB AND RESTART PROCESS </TD>
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<tr bgcolor="#FFFFFF">
<TD align='center'> FAVOLUME </TD><TD align='center'> Daily </TD><TD align='left'> 6/30/04 10:30 AM </TD><TD align='left'> 6/30/04 4:15 PM </TD><TD align='center'> SUCCESS </TD><TD align='left'> RESTART THE PROCESS </TD>
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<tr bgcolor="#FFFFFF">
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<tr bgcolor="#FFFFFF">
<TD align='center'> HP_HOURSLOAD </TD><TD align='center'> Daily </TD><TD align='left'> 7/26/04 7:10 AM </TD><TD align='left'> 7/26/04 7:10 AM </TD><TD align='center'> SUCCESS </TD><TD align='left'> RESTART THE PROCESS </TD>
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<tr bgcolor="#FFFFFF">
<TD align='center'> HP_PUNCHPROCESS </TD><TD align='center'> Daily </TD><TD align='left'> 7/26/04 7:10 AM </TD><TD align='left'> 7/26/04 7:10 AM </TD><TD align='center'> SUCCESS </TD><TD align='left'> RESTART THE PROCESS </TD>
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<tr bgcolor="#FFFFFF">
<TD align='center'> MONTHLYVOLUME </TD><TD align='center'> Monthly </TD><TD align='left'> 6/1/04 12:00 AM </TD><TD align='left'> 6/1/04 12:11 AM </TD><TD align='center'> SUCCESS </TD><TD align='left'> RESTART THE PROCESS </TD>
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<tr bgcolor="#FFFFFF">
<TD align='center'> PREPAIDRATEMAP </TD><TD align='center'> DAILY </TD><TD align='left'> 6/29/04 10:26 AM </TD><TD align='left'> 6/29/04 10:38 AM </TD><TD align='center'> SUCCESS </TD><TD align='left'> RESTART THE PROCESS </TD>
</tr>
<TR bgcolor="#FFFFFF">
<TD colspan="6" align="center">
<B>Total records returned : 14</B>
</TD>
</TR>
</TABLE>
</form>
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- If I re-install memory modules one by one and changing the position, Could it reset the speed values of the system?
- Can I access to any hidden BIOS settings to tweak the memory? (I have a Medion system that has a hidden and password protected BIOS mode accessible through F11 instead of F2 where I can find lots of options not shown in normal F2 BIOS)
- Any more ideas?
Many thanks in advance. Any help would be much apreciated.

Hi HiperGrover,
As PauPau wrote, the limited FSB is 533 MHz and that means the memory modules will run at this speed. Furthermore DDR2-667 modules can be used properly but they run only with lower speed.
So don be worry about this, everything is ok with your notebook.
Last but not least in BIOS there are no options about tweaking the modules and such options will not bring a strong performance boost but they could make your computer unstable.

PL/SQL vs JSP vs Servlets

We are in the stage of deciding which language to develop portlets. I lean towards JSP or servlets for the wide array of Java libraries we can use. I think the only advantage of PL/SQL is speed. Thanks.

It depends. If your developers are mainly Java developers, you'll probably prefer building web portlets. But if you have a strong PL/SQL skill set you could choose the latter. Additionally, if you're developing content that is database intensive you may want to build PL/SQL portlets since they transact with the database faster. If you're going to aggregate content from various web sites, using web providers is preferable. It's a matter of choice based on your requirements and preferences.

How to call a repeater within a jsp file in web portal

Hello, I wrote a Timer javascript to create a Timer thread that keep running and repeating for every 5 seconds. Basically, this javascript includes a StartTimer(), StopTimer() and UpdateTimer(), I also have a repeater to retrieve data from Oracle Dataabse and diplay them on the screen. Here are the codes
=======================================================
<table border="1">
<netui-data:repeater dataSource="{pageFlow.trackData}" >
<netui-data:repeaterHeader>
<tr>

<td style="font-family:times new roman;font-size:14pt;color:#0000ff;">TrackNumber</td>
<td style="font-family:times new roman;font-size:14pt;color:#0000ff;">Latitude</td>
<td style="font-family:times new roman;font-size:14pt;color:#0000ff;">Longitude</td>
<td style="font-family:times new roman;font-size:14pt;color:#0000ff;">Altitude</td>
<td style="font-family:times new roman;font-size:14pt;color:#0000ff;">Course</td>
<td style="font-family:times new roman;font-size:14pt;color:#0000ff;">Speed</td>
<td style="font-family:times new roman;font-size:14pt;color:#0000ff;">Time</td>
</tr>
</netui-data:repeaterHeader>
<tr>
<netui-data:repeaterItem>

<td><netui:label value="{container.item}" defaultValue=" "></netui:label></td>
<% j = j + 1; %>
<% if (j > 6) { %>
</tr>
<% j = 0; %>
<tr>
<% } %>
</netui-data:repeaterItem>
</tr>
</netui-data:repeater>
</table>
====================================================
I also wrote another Timer running in the server side. here are the codes
======================================================
<%!
public void startTimer(HttpServletRequest request)
Timer timer = new Timer();
TimerTask monitorTimerTask = new Monitor();
timer.schedule(monitorTimerTask, 5000, 5000);
request.getSession().setAttribute("My Timer", monitorTimerTask);
System.out.println("Timer starts");
%>
<%!
public class Monitor extends TimerTask
public void run()
%>
<%!
public void stopTimer(HttpServletRequest request)
TimerTask monitor = (TimerTask) request.getSession().getAttribute("My Timer");
if (monitor != null)
System.out.println("Timer stops");
monitor.cancel();
%>
<% if (request.getParameter("start") != null)
startTimer(request);
%>
<% if (request.getParameter("stop") != null)
stopTimer(request);
%>
<input type="button" value="Start the Timer" onclick="document.location='index.jsp?start=true'">
<input type="button" value="Stop the Time" onclick="document.location='index.jsp?stop=true'">
======================================================
My question is how do (can I) call those codes repeater above within the StartTimer() in Javascript or the funtion run() in the class Monitor, which will will be called continuously every 5 seconds, whenever I click on the button Start. Right now, it seems to me that whenever the portal starts, then those repeater codes are executed just once and are not executed when I click on the start button to call the start() in javascripts/run() in the class Monitor.
PS. I include the codes for two different Timers but in my portal there is only one Timer and I can pick one of those, whichever works better. Please help
Thank you
TL

It might compile perfectly well, but the message suggests that you didn't deploy it properly. The class loader can't find it.
That .class file should appear with its package directory structure under the WEB-INF/classes directory or in a JAR in your WEB-INF/lib directory in some WAR file. Does it?

Just got U-verse today, how do I set up speed dialing on my phone, I had it with the ATT service, but it does not work with the UVerse

OK - I looked at the manual & see they made it major project. Instead of simply assigning tel numbers to each of the dialing digits, you have to build a directory record first, then you can assign the directory record to a dialing digit.
Looks like the simple part is using it - just press and hold the digit to dial the whole number.
So, it will take 40 minutes or so to break down the steps in understandable prose. It is too late to start now & i have a vet appointment in the am. All day is kind of full. But, I will try to do it tomorrow (thurs the 18th)

Seemed like there should be a speed dial, so I did a search & found the cure is worse than the disease -
Dial from your phone
Make calls directly from your existing touch-tone home phone:
Local calls: Dial the 7- or 10-digit phone number.
Long distance calls: Dial 1 + area code + 7-digit phone number.
International calls: Dial 011 + country code + 7-digit phone number.
Dial online from your myAT&T account
Call from your online Address Book or Call History, which shows a list of up to 100 of your most recent call records sorted by date and time:
Log in to myAT&T. Don't have a myAT&T login? Register today!
From the I want to menu, select Manage my plans and services and then Manage my phone features.
Your U-verse portal will open and a Make a Call box will appear on the left side of the page.
Enter a number to dial or select a number from your Call History or Address Book.
Specify whether you'd like to activate/deactivate Caller ID Blocking and Call Waiting for the call.
Select Place Call.
When your home phone rings, pick it up to place your call.
Important Note
To find numbers in the Call History, you can also sort numbers by missed, answered, outgoing, name, length of call, or type, or search for a specific call.
Dial from your U-verse TV
With U-verse TV, you can view a list of up to 100 of your most recent incoming call records by date and time on your TV screen. Use your U-verse TV remote to tune to your Call History and return calls with the press of a button.
Tune to Channel 9900 using your U-verse TV remote.
Select a U-verse Voice phone number on screen.
Press OK to view a log of answered and missed calls. You can sort by name, date, and phone number.
Scroll using the arrows.
Select a number and press OK to return a call.
Select Call and press OK.
When your home phone rings, pick it up to place your call.
You can have a call list accesed from a browser.
You can call back a historical call from the browser or TV.
https://www.att.com/esupport/article.jsp?sid=KB401002

Intermittant server error when trying to compile jsp.

          Hi,
          I'm testing my jsp on different browser versions, and on different connection
          speeds, and I'm finding a consistent problem with using weblogic v6.1sp1 and slower
          connections. (about 56k)
          In IE 5/5.5/6, a 'This page cannot be displayed' error shows up. There is no error
          in the webserver log and if you enter the url again, it will usually work, or
          it might need to be entered twice.
          This appears to be a jsp compilation issue, and I'm not sure if it can be resolved.
          Any help would be greatly appreciated.
          Thanks,
          Maeve


Are you using an error page? I've seen IE do some strange things with error
          pages with content less than 255 chars long!
          "Maeve Loughnane" <[email protected]> wrote in message
          news:3c626843$[email protected]..
          >
          > Hi,
          >
          > I'm testing my jsp on different browser versions, and on different
          connection
          > speeds, and I'm finding a consistent problem with using weblogic v6.1sp1
          and slower
          > connections. (about 56k)
          >
          > In IE 5/5.5/6, a 'This page cannot be displayed' error shows up. There is
          no error
          > in the webserver log and if you enter the url again, it will usually work,
          or
          > it might need to be entered twice.
          >
          > This appears to be a jsp compilation issue, and I'm not sure if it can be
          resolved.
          >
          > Any help would be greatly appreciated.
          > Thanks,
          > Maeve

[MapViewer] MapClient.jsp to Servlet?

Hi,
Has anybody ever tried to convert the demo that comes with MapViewer into a servlet?
Right now the MapClient.jsp demo is very slow here, and I hope to get some speed improvements with a servlet. I also think it's a little easier to add some extra functionallity with a servlet...
So, has anybody done it?

You may want to first find out what's slowing down the jsp client. Most likely its the database query time dominating the performance, in which case converting the jsp into servlet wont help much.
you can change the logging level of MapViewer to "finest" and check the logs while doing a few zoom/pans from the client. see how much time is spent in loading the data from db and what's the percentage of that in the overall process.
lj

Compiling jsp pages in wl 10.0 2 times slower than wl 9.1

Hi:
I have enterprise application. In weblogic 9 it took 4-5min to compile all the jsp pages, in weblogic 10 it takes 10-11min!!
Is there anything I can do to speed it up?

Hi, thanks for your answers.
Yes, I actually build the ear file and then I call weblogic.appc on it. And again, on wl 9 it used to take 4-5min, now it is taking 10-11min. Most of the time of the build process is taken by the page compilation.
The other thing I noticed is that if I change a page the time it takes WL to recompile the page is way longer than before. I have to wait for a good 14-15seconds until the weblogic returns the new page. The weblogic java process goes up to almost 100%. Before, in WL 9 I had to wait just a few seconds. And ok, my computer is a dual core at 2.33GHz. Don't tell me I need to upgrade :-).
I realize that the jsp compilation must have gotten more complicated because now jsf & jsp are unified but still....
My app is a jsf application and I also use tag files.
About precompiling the pages... I build the application on windows then I deploy it on linux. In WL 9, whenever I deployed the app, I had to precompile the pages otherwise the users experienced slower responses the first time. For whatever reason WL 9 didn't think the pages were already precompiled (they were part of the ear file). In WL 10 that seemed to have been fixed.

Speeding up jsp

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