Servlet plus mysql problem

Well... Using Tomcat 557 and MySQL 411 I have a problem. I load a Driver (MySQL Connector/J) and create a connection object in servlet's init procedure. All woks fine. I stop Mysql and reload the servlet, nothing can be seen on a browser window - as it should be. When I start MySQL again - it cannot read from database - as if mysql were down. It works again if I reload the context, but not otherwise.
Is there some way to correct this problem?
There is also another peculiarity when using Mozilla Firefox 1.0.4. When I make a servlet that saves something to a file, it does it three times. Same happens with database systems. When I read from a database, it does it three times. Using MSIE or Opera, reading or writing is done once.
-poj

Hi! And thanks for the answer.
I still don't understand.
Connection object is alive in the servlet, because it is a global attribute of the servlet and servlet is alive.
Am I right when I think that servlet does not do it's init method again until servlet stops. If so, connection object, created in init, should be alive although database is down.
Connection object seems to loose database when database is temporarily down meanwhile you try to read from database. Connection does not nullify. All works fine after restarting database if there is no action to database when it is down.
I have not tested system when using datasource and pooling with tomcat servlet.xml, but creating connections in init method seems to have a problem.
Can anyone find a way to correct my problem.
And the Firefox problem. There is no javascript and this peculiar three times loading/writing to a file happens with Firefox.
-poj

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I've to deploy it in the same place of .class ?No, you should create a war (or ear) file, and place the driver jar in the correct location of that file.
http://java.sun.com/j2ee/tutorial/1_3-fcs/doc/WebComponents3.html
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Message was edited by: Sarpedon Jones

I've got the same problem but It sounds like I've gotten farther. I was forced to do an emergency move of some Perl and PHP sites to 10.5.4 when our 10.4 web server refused to authenticate to AD anymore...
Leopard's Apache/Perl support is terrible. There is not click to add option anymore so you have to manually set up mod_perl. No big deal but the first sign that there isn't reasonable support.
The bigger issue is that Apple's Perl will not compile some modules.. namely DBD::mysql.
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You should be able to run "cpan" or "cpanp" [cpan plus] to get a cpan interactive prompt. At this point you should be able to compile DBD by issuing either of the following:
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You can't do this:
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See if that works better. - MOD

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Hi,
Three things:
1. I presume numbers refers to the prot you are accesaing mysql - i tend to use default 3306.
2. If there are problems recognising DriverManagaer are you importing java.sql.*; I'm sure you are.
3. I think the sun.tools.javac.Main error relates to the tools version that you are using, although I would not guarantee this. The tools.jar in later versions of tomcat is twice the size of earlier versions and you have to ensure this is the version that your application is checking for. A quick test for this is to put the newer version(size 74k) into WEB-INF \lib directory where an application looks first for complied java files.
best,
kev
ps If I'm wrong completely, let me know as I am watching this topic

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actually i am working in JSP. and when i got this problem, i created a small java program for testing.
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friend please put your code inside
// your code goes here it will more readable and other can solve it better.
==================
and your problem tells that you must set access permission inside
mySQL server.
or try with creating new User with password.
EnJOY.
Ghanshyam
Edited by: Ghanshyam on Sep 28, 2007 4:13 PM

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Hi sumitk,
Sorry for the delay in responding, I live down under so I'm in bed when everyone else is logged on.
You can implement Observer as you have done from a servlet, I think something in the way you have written the servlet is causing you threading problems. My knowledge is a bit vague but try this article from javaworld:
http://www.javaworld.com/javaworld/javatips/jw-javatip29.html?
Its seems pretty good.

NX8600GTS - Diamond Plus HDMI Problem

I have this new video card and am trying to connect a single display via HDMI only. I do not wish to use DVI. I'm having difficulity in setting this up properly. I need help. So far the only way I can get this to work is using Dual Display option and use DVI and then send the signal to the HDMI interface; however it requires the DVI connecter be active. Any suggestions would be appreciated.

I too am having this problem!! This is a serious problem that someone from MSI needs to address. I bought this card to use on my HTPC in my living room on my new Sony 52" LCD for gaming and HDTV. If I plug just the HDMI in then then everything works up until the point Windows is supposed to start, and the sytem goes still and no display unless I plug something into the DVI port, even a VGA adapter to the TV's built in PC input, then suddently the system starts to boot. I don't want to have to flip back and forth just to get windows to boot everytime!
I did some searching on the internet and noticed other people have had this problem in the past with older model Nvidia cards like the 6800. They appeared to have solved the problem by updating the Nvidia Bios with an ASUS version bios (even though their card was a different manufacturer). I don't want to attempt this, but the moral of the story is it means the problem most likely is bios related, not driver. Also the fact that Windows doesn't even boot yet, meaning the driver isn't even loaded yet, confirms that assumption. What is probably happening is Windows is not detecting any displays so it doesn't boot. I tried to update the MSI bios but apparently it's at the most current version, and there are no older versions listed for download I could try.
Can someone from MSI please help us out here with this problem? Most of the people who buy this HDMI card want to plug it into their HDTV as the only display. If you can't do that with the HDMI it's worthless for that use!
Quote from: jzizzi on 11-December-07, 05:44:02
I have the same problem as the original poster with still no solution.
Maybe I can clear it up a little as far as the specific problem.
Hardware:
MSI 8600GTS Diamond Plus (just one, no sli)
MSI K9N SLI MB
Corsair XMS2 Ram
Sony Bravia 60" Projection TV
If I plug the video card into a regular monitor via DVI, video card works great. Boots into Windows XP, everything is good.
As soon as I disconnect the card from the monitor and move it to the tv and connect the tv via HDMI, system can boot into BIOS but after the summary screen, goes blank and Windows won't load. No HDD active LED, nothing.
As soon as I plug in a monitor via DVI, boot into Windows, plug in HDMI, switch to Multiple monitors, I can then use the TV as a monitor.
This wont due since I don't want to have a monitor sitting next to my TV all the time.
I don't want to use another output method for my TV as, the way my sound system is connected, I don't want to have to select different sound sources everytime I switch input's on my tv (if that makes sense to anyone).
I have done a MSILive BIOS update for the card but I'm not sure what it did since I didn't read the release notes.
Drivers have no affect in this problem since it doesn't physically boot into Windows anyway.
ANY HELP WOULD BE AWESOME!!!

Mysql problem with german special characters

hi,
I wrote a software and it worked quite good, but after I installed it on a new machine with j2se 1.4 I've problems with the german special characters.
this code works good on the old machine (jdk 1.3.1) and prints the wanted characters like �,�,�.
Class.forName("org.gjt.mm.mysql.Driver").newInstance();
java.sql.Connection conn;
conn = DriverManager.getConnection("jdbc:mysql://localhost/testdb?user=testuser&password=xxxx");
Statement s = conn.createStatement();
ResultSet r = s.executeQuery("select something from testtb where id='1'");
r.first();
System.out.println( r.getString(1) );
but on the new machine (j2se 1.4) I only receive the character ?.
I updated my org.gjt.mm.mysql to the current MySQL Connector/J 3.0.9 and added
conn = DriverManager.getConnection("jdbc:mysql://localhost/testdb?user=testuser&password=xxxx&useUnicode=true&characterEncoding=ISO-8859-1");
but I've got still the same problem.
Thanks in advance
Markus

with "wanted characters like �,�,�"
I meant: like ä,ü,ö

Servlet plus mysql problem

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