Two instance servlet during startup
Hi ! I am load servlet on startup. servlet servlet-nameMailingListServlet/servlet-name servlet-classservlets.MailingListServlet/servlet-class init-param param-nameperiod/param-name param-value20/param-value /init-param load-on-startup/load-on-startup /servlet But tomcat load two instance this servlet !!! In what there can be a problem ? I am using Windows 2000 + Java 1.3 + Tomcat 4.0.1. P.S. Tomcat start two instance of any servlets with startup.
Servlet on startup
Hi all, The following XML snippet has been used to initialize our application for about the past 8 months. servlet servlet-nameInit/servlet-name servlet-classcom.hotgen.website.init.Init/servlet-class load-on-startup1/load-on-startup /servlet It has worked faultlessly with tomcat 3.2.3 but fails to startup with tomcat 4.0.1. 4.0.1 seems to know about the context - the following is in server.xml Context path=/nis docBase=../../../NisWebApplication/nis debug=0 reloadable=true Logger className=org.apache.catalina.logger.FileLogger prefix=nis_tomcat_log. suffix=.txt timestamp=true/ /Context and web.xml is in ../../../NisWebApplication/nis/WEB-INF. Is there anything wrong with this? Any help will be appreciated Conrad Winchester BTW the ..'s are the only way I could get it to load the application without a file io exception!! -- To unsubscribe: mailto:[EMAIL PROTECTED] For additional commands: mailto:[EMAIL PROTECTED] Troubles with the list: mailto:[EMAIL PROTECTED]
Re: servlet in startup
Can someone please help me how to make my servlet run when the Tomcat starts up. What do I have to do in my codes to impelement this or some setup needed for my Tomcat config.? Put these lines in web.xml: servlet servlet-namestartlogging/servlet-name servlet-classstartlogging/servlet-class load-on-startup1/load-on-startup /servlet The number in the load-on-startup tag specifies the order of loadup. In your servlet, put the code that you want to run on startup in the init() method. It will be called in the order listed in the web.xml on server startup. It works. I use it to start log4j and to start my database connection pool.
servlet in startup
Hi guys, Can someone please help me how to make my servlet run when the Tomcat starts up. What do I have to do in my codes to impelement this or some setup needed for my Tomcat config.? Thanks in advance
Re: servlet in startup
Look at the load on startup flag in web.xml hth dim On Mon, 22 Oct 2001, Jovie Castaneda wrote: Hi guys, Can someone please help me how to make my servlet run when the Tomcat starts up. What do I have to do in my codes to impelement this or some setup needed for my Tomcat config.? Thanks in advance
RE: servlet in startup
Im trying to load this servlet but I think im doing some funny thing here I edited the following tags in the web.xml servlet-name Demolog /servlet-name servlet-class Demolog /servlet-class load-on-startup -2147483646--- i am not sure of this so i retained this value /load-on-startup ...then I tried to start Tomcat and it says that it cannot load Demolog How do I get around with this? Thanks in advance. -Original Message- From: Dmitri Colebatch [mailto:[EMAIL PROTECTED]] Sent: Monday, October 22, 2001 10:07 AM To: [EMAIL PROTECTED] Subject: Re: servlet in startup Look at the load on startup flag in web.xml hth dim On Mon, 22 Oct 2001, Jovie Castaneda wrote: Hi guys, Can someone please help me how to make my servlet run when the Tomcat starts up. What do I have to do in my codes to impelement this or some setup needed for my Tomcat config.? Thanks in advance
RE: servlet in startup
Are you sure, that 'Demolog' is the fully qualified name of your Servlet? I mean, don't you have a package name? (property servlet-class) To load a Servlet at startup you need to provide some positive number as the load-on-startup property. If you want to call your Servlet from an URL like http://localhost:8080/Demolog then you have to add a servlet-mapping to your web.xml. Example servlet-mapping servlet-nameDemolog/servlet-name url-pattern/Demolog/url-pattern /servlet-mapping hope this helps. pero -Original Message- From: Jovie Castaneda [mailto:[EMAIL PROTECTED]] Sent: Monday, October 22, 2001 2:20 AM To: [EMAIL PROTECTED] Subject: RE: servlet in startup Im trying to load this servlet but I think im doing some funny thing here I edited the following tags in the web.xml servlet-name Demolog /servlet-name servlet-class Demolog /servlet-class load-on-startup -2147483646--- i am not sure of this so i retained this value /load-on-startup ...then I tried to start Tomcat and it says that it cannot load Demolog How do I get around with this? Thanks in advance. -Original Message- From: Dmitri Colebatch [mailto:[EMAIL PROTECTED]] Sent: Monday, October 22, 2001 10:07 AM To: [EMAIL PROTECTED] Subject: Re: servlet in startup Look at the load on startup flag in web.xml hth dim On Mon, 22 Oct 2001, Jovie Castaneda wrote: Hi guys, Can someone please help me how to make my servlet run when the Tomcat starts up. What do I have to do in my codes to impelement this or some setup needed for my Tomcat config.? Thanks in advance
RE: servlet in startup
On Mon, 22 Oct 2001, Jovie Castaneda wrote: Im trying to load this servlet but I think im doing some funny thing here I edited the following tags in the web.xml servlet-name Demolog /servlet-name servlet-class Demolog /servlet-class load-on-startup -2147483646--- i am not sure of this so i retained this value /load-on-startup ...then I tried to start Tomcat and it says that it cannot load Demolog How do I get around with this? FIrstly, the load-on-startup is explained in the spec (worth a read: http://java.sun.com/products/servlet/download.html), but you have two options. the simple option is to use an empty load-on-startup / tag, and tomcat will load the server (call its init method) in the startup procedure, with no guarentee of order. If you need servlets to be loaded in a certain order, then you specify the value load-on-startup1/load-on-startup in the load on startup tag. lower values are loaded first. now if you get the error message, that means something is going wrong in yourt init method. use your favourite logging package to find out whats going on (see http://jakarta.apache.org/log4j if you dont have a favourite logging package (o: ). hth dim Thanks in advance. -Original Message- From: Dmitri Colebatch [mailto:[EMAIL PROTECTED]] Sent: Monday, October 22, 2001 10:07 AM To: [EMAIL PROTECTED] Subject: Re: servlet in startup Look at the load on startup flag in web.xml hth dim On Mon, 22 Oct 2001, Jovie Castaneda wrote: Hi guys, Can someone please help me how to make my servlet run when the Tomcat starts up. What do I have to do in my codes to impelement this or some setup needed for my Tomcat config.? Thanks in advance
RE: servlet in startup
thanks for the reply my Demolog servlet resides in /test/servlet/* what I did is change the dtd for servlet-mapping into this servlet-name Demolog /servlet-name url-pattern /test/servlet/* /url-pattern Does this make sense ? -Original Message- From: pero [mailto:[EMAIL PROTECTED]] Sent: Monday, October 22, 2001 10:32 AM To: [EMAIL PROTECTED] Subject: RE: servlet in startup Are you sure, that 'Demolog' is the fully qualified name of your Servlet? I mean, don't you have a package name? (property servlet-class) To load a Servlet at startup you need to provide some positive number as the load-on-startup property. If you want to call your Servlet from an URL like http://localhost:8080/Demolog then you have to add a servlet-mapping to your web.xml. Example servlet-mapping servlet-nameDemolog/servlet-name url-pattern/Demolog/url-pattern /servlet-mapping hope this helps. pero
RE: servlet in startup
-Original Message- From: Dmitri Colebatch [mailto:[EMAIL PROTECTED]] Sent: Monday, October 22, 2001 10:07 AM To: [EMAIL PROTECTED] Subject: Re: servlet in startup Look at the load on startup flag in web.xml hth dim On Mon, 22 Oct 2001, Jovie Castaneda wrote: Hi guys, Can someone please help me how to make my servlet run when the Tomcat starts up. What do I have to do in my codes to impelement this or some setup needed for my Tomcat config.? Thanks in advance Hi thanks for the reply but Im really grasping here :( I tried to download tomcat-manual-3.2.3-1.noarch.rpm but I dont know how to open this file so I can read on this.. thanks for guiding me :)
RE: servlet in startup
On Mon, 22 Oct 2001, Jovie Castaneda wrote: Can someone please help me how to make my servlet run when the Tomcat starts up. What do I have to do in my codes to impelement this or some setup needed for my Tomcat config.? Thanks in advance Hi thanks for the reply but Im really grasping here :( I tried to download tomcat-manual-3.2.3-1.noarch.rpm but I dont know how to open this file so I can read on this.. thanks for guiding me :) this sort of stuff isn't specific to tomcat, which is why I pointed you at the spec, rather than the tomcat manual. however, the tomcat docs should be included in the tomcat file you downloaded, look in tomcat/docs to see them. as for installing rpms , try # rpm -ivh tomcat-manual-3.2.3-1.noarch.rpm as root. rpms are out of the scope of this list, you'd be better off finding a linux book for that, but I wouldn't worry about it, you dont need to - just look in the docs directory of tomcat, and the mailing list acrhives: http://www.mail-archive.com/tomcat-user@jakarta.apache.org/ hth dim
RE: servlet in startup
I tried testing my servlet to run when Tomcat starts...and I got this mesg
from my console
cannot load servlet name: StartMe
In WebCollect, this day = 296
In WebCollect, next day = 297
Starting WebCollect Server...
cannot load servlet name: StartMe
cannot load servlet name: StartMe
I just find it strange because it says that it cannot load the StartMe but
the next line are from the init method of my StartMe Servlet
Does my init method have a prob?
public void init (ServletConfig config) throws ServletException {
System.out.println(Init Called for WebCollect ...);
java.util.TimeZone.setDefault(java.util.TimeZone.getTimeZone(AET));
java.text.SimpleDateFormat sdf = new
java.text.SimpleDateFormat(MMMddhhmm);
java.util.Date thisTime = new java.util.Date();
calendar.setTime(thisTime);
dayOfYear = calendar.get(Calendar.DAY_OF_YEAR) ;
dayOfYear += 1 ;
nextDay = dayOfYear + 1 ;
System.out.println(In WebCollect, this day = + dayOfYear );
System.out.println(In WebCollect, next day = + nextDay);
sdf = new java.text.SimpleDateFormat(dd/MM/yy hh:mm:ss a);
System.out.println(Starting WebCollect Server...);
}
hoping for your replies...
-Original Message-
From: Dmitri Colebatch [mailto:[EMAIL PROTECTED]]
Sent: Monday, October 22, 2001 11:05 AM
To: [EMAIL PROTECTED]
Subject: RE: servlet in startup
On Mon, 22 Oct 2001, Jovie Castaneda wrote:
Can someone please help me how to make my servlet run when the
Tomcat
starts up. What do I have to do in my codes
to impelement this or some setup needed for my Tomcat config.?
Thanks in advance
Hi thanks for the reply but Im really grasping here :(
I tried to download tomcat-manual-3.2.3-1.noarch.rpm
but I dont know how to open this file so I can read on this..
thanks for guiding me :)
this sort of stuff isn't specific to tomcat, which is why I pointed you at
the spec, rather than the tomcat manual. however, the tomcat docs should
be included in the tomcat file you downloaded, look in tomcat/docs to see
them.
as for installing rpms , try
# rpm -ivh tomcat-manual-3.2.3-1.noarch.rpm
as root. rpms are out of the scope of this list, you'd be better off
finding a linux book for that, but I wouldn't worry about it, you dont
need to - just look in the docs directory of tomcat, and the mailing list
acrhives:
http://www.mail-archive.com/tomcat-user@jakarta.apache.org/
hth
dim
RE: servlet in startup
Put a try/catch around the init method, and print the stack trace. by the
looks of it I'm guessing your date format is wrong. btw, if you want the
default date format use DateFormat.getDateInstance() or
DateFormat.getDateTimeInstance() for the locale's normal date and
date/time formats. THere's a host of other DateFormat.get... methods
which are also worth looking at.
hth
dim
On Mon, 22 Oct 2001, Jovie Castaneda wrote:
I tried testing my servlet to run when Tomcat starts...and I got this mesg
from my console
cannot load servlet name: StartMe
In WebCollect, this day = 296
In WebCollect, next day = 297
Starting WebCollect Server...
cannot load servlet name: StartMe
cannot load servlet name: StartMe
I just find it strange because it says that it cannot load the StartMe but
the next line are from the init method of my StartMe Servlet
Does my init method have a prob?
public void init (ServletConfig config) throws ServletException {
System.out.println(Init Called for WebCollect ...);
java.util.TimeZone.setDefault(java.util.TimeZone.getTimeZone(AET));
java.text.SimpleDateFormat sdf = new
java.text.SimpleDateFormat(MMMddhhmm);
java.util.Date thisTime = new java.util.Date();
calendar.setTime(thisTime);
dayOfYear = calendar.get(Calendar.DAY_OF_YEAR) ;
dayOfYear += 1 ;
nextDay = dayOfYear + 1 ;
System.out.println(In WebCollect, this day = + dayOfYear );
System.out.println(In WebCollect, next day = + nextDay);
sdf = new java.text.SimpleDateFormat(dd/MM/yy hh:mm:ss a);
System.out.println(Starting WebCollect Server...);
}
hoping for your replies...
-Original Message-
From: Dmitri Colebatch [mailto:[EMAIL PROTECTED]]
Sent: Monday, October 22, 2001 11:05 AM
To: [EMAIL PROTECTED]
Subject: RE: servlet in startup
On Mon, 22 Oct 2001, Jovie Castaneda wrote:
Can someone please help me how to make my servlet run when the
Tomcat
starts up. What do I have to do in my codes
to impelement this or some setup needed for my Tomcat config.?
Thanks in advance
Hi thanks for the reply but Im really grasping here :(
I tried to download tomcat-manual-3.2.3-1.noarch.rpm
but I dont know how to open this file so I can read on this..
thanks for guiding me :)
this sort of stuff isn't specific to tomcat, which is why I pointed you at
the spec, rather than the tomcat manual. however, the tomcat docs should
be included in the tomcat file you downloaded, look in tomcat/docs to see
them.
as for installing rpms , try
# rpm -ivh tomcat-manual-3.2.3-1.noarch.rpm
as root. rpms are out of the scope of this list, you'd be better off
finding a linux book for that, but I wouldn't worry about it, you dont
need to - just look in the docs directory of tomcat, and the mailing list
acrhives:
http://www.mail-archive.com/tomcat-user@jakarta.apache.org/
hth
dim
RE: servlet in startup
I tried putting a try catch clause but nothing has been caught..
then i made my init mehtod simple
public void init (ServletConfig config) throws ServletException {
System.out.println(Init Called for WebCollect ...);
System.out.println ( TEST START );
System.out.println(Starting WebCollect Server...);
}
and the console showed this mesg
cannot load servlet name: StartMe
Init Called for WebCollect ...
TEST START
Starting WebCollect Server...
cannot load servlet name: StartMe
cannot load servlet name: StartMe
its laoding the init()of StartMe but its saying that it
cant load the StartMe..im confused now..please help!!
-Original Message-
From: Dmitri Colebatch [mailto:[EMAIL PROTECTED]]
Sent: Monday, October 22, 2001 11:54 AM
To: [EMAIL PROTECTED]
Subject: RE: servlet in startup
Put a try/catch around the init method, and print the stack trace. by the
looks of it I'm guessing your date format is wrong. btw, if you want the
default date format use DateFormat.getDateInstance() or
DateFormat.getDateTimeInstance() for the locale's normal date and
date/time formats. THere's a host of other DateFormat.get... methods
which are also worth looking at.
hth
dim
On Mon, 22 Oct 2001, Jovie Castaneda wrote:
I tried testing my servlet to run when Tomcat starts...and I got this mesg
from my console
cannot load servlet name: StartMe
In WebCollect, this day = 296
In WebCollect, next day = 297
Starting WebCollect Server...
cannot load servlet name: StartMe
cannot load servlet name: StartMe
I just find it strange because it says that it cannot load the StartMe
but
the next line are from the init method of my StartMe Servlet
Does my init method have a prob?
public void init (ServletConfig config) throws ServletException {
System.out.println(Init Called for WebCollect ...);
java.util.TimeZone.setDefault(java.util.TimeZone.getTimeZone(AET));
java.text.SimpleDateFormat sdf = new
java.text.SimpleDateFormat(MMMddhhmm);
java.util.Date thisTime = new java.util.Date();
calendar.setTime(thisTime);
dayOfYear = calendar.get(Calendar.DAY_OF_YEAR) ;
dayOfYear += 1 ;
nextDay = dayOfYear + 1 ;
System.out.println(In WebCollect, this day = + dayOfYear );
System.out.println(In WebCollect, next day = + nextDay);
sdf = new java.text.SimpleDateFormat(dd/MM/yy hh:mm:ss a);
System.out.println(Starting WebCollect Server...);
}
hoping for your replies...
-Original Message-
From: Dmitri Colebatch [mailto:[EMAIL PROTECTED]]
Sent: Monday, October 22, 2001 11:05 AM
To: [EMAIL PROTECTED]
Subject: RE: servlet in startup
On Mon, 22 Oct 2001, Jovie Castaneda wrote:
Can someone please help me how to make my servlet run when the
Tomcat
starts up. What do I have to do in my codes
to impelement this or some setup needed for my Tomcat config.?
Thanks in advance
Hi thanks for the reply but Im really grasping here :(
I tried to download tomcat-manual-3.2.3-1.noarch.rpm
but I dont know how to open this file so I can read on this..
thanks for guiding me :)
this sort of stuff isn't specific to tomcat, which is why I pointed you at
the spec, rather than the tomcat manual. however, the tomcat docs should
be included in the tomcat file you downloaded, look in tomcat/docs to see
them.
as for installing rpms , try
# rpm -ivh tomcat-manual-3.2.3-1.noarch.rpm
as root. rpms are out of the scope of this list, you'd be better off
finding a linux book for that, but I wouldn't worry about it, you dont
need to - just look in the docs directory of tomcat, and the mailing list
acrhives:
http://www.mail-archive.com/tomcat-user@jakarta.apache.org/
hth
dim
RE: Double loading when loading servlet on startup
Lot of thanks, Larry. You are absolutely right. It was due to different contexts. Thank you! I actually was in little panic about this problem:) --Che -Original Message- From: Larry Isaacs [mailto:[EMAIL PROTECTED]] Sent: Wednesday, August 08, 2001 10:05 PM To: '[EMAIL PROTECTED]' Subject: RE: Double loading when loading servlet on startup I tried this scenario with Tomcat 3.2.1 and I only get one call to init(). Are you on Windows? If your ts directory is actually named Ts, I think you would get two context's. What does your tomcat log show about contexts being added? Larry -Original Message- From: Alexander Cherinko [mailto:[EMAIL PROTECTED]] Sent: Wednesday, August 08, 2001 1:51 PM To: [EMAIL PROTECTED] Subject: RE: Double loading when loading servlet on startup The case: Nt/Linux v3.2.1,2,3. There is one context: Context path=/ts docBase=webapps/ts crossContext=true debug=1 reloadable=true(or false) trusted=false /Context The web.xml piece for this context servlet servlet-nameLoader/servlet-name servlet-classLoader/servlet-class load-on-startup1/load-on-startup /servlet jdb shows double classes named Loader loaded with different instances of org.apache.tomcat.loader.AdaptiveClassLoader12 which have generation field 2 and 4 correspondingly. If I call Class.forName(MyClass) in init method of servlet and MyClass is subclass of thread I have double threads. And so on. gc gets nothing and trying to interrupt threads in servlet's destroy method gets nothing as well. And this occurs only when servlet is marked as load-on-startup. For ordinary servlet there is nothing like this. --Che -Original Message- From: Larry Isaacs [mailto:[EMAIL PROTECTED]] Sent: Wednesday, August 08, 2001 7:58 PM To: '[EMAIL PROTECTED]' Subject: RE: Double loading when loading servlet on startup In the past, the cases of double loading I've seen have all been because an auto-loaded context (created by AutoSetup from the webapps directory) was also manually loaded as a second context, i.e. Context path=/othercontext docBase=webapps/examples ... Each context gets its own instance of servlets. As a result, init() is called twice, once for each context. There isn't enough information below to tell if this is the source of the double-loading. Cheers, Larry -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]] Sent: Wednesday, August 08, 2001 12:32 PM To: [EMAIL PROTECTED] Subject: RE: Double loading when loading servlet on startup Got the same problem :(( (on v3.2.3 - NT) -Message d'origine- De : Alexander Cherinko [mailto:[EMAIL PROTECTED]] Envoye : mercredi 8 aout 2001 16:38 A : [EMAIL PROTECTED] Objet : Double loading when loading servlet on startup Hi problem is that when I mark servlets as load-on-startup they are loaded twice in jvm. I want this servlet to serve as initializer i.e. to initialize some other classes in its init method. The worst is that that classes are double loaded too. I.e. I want to init class which is Thread subclass to perform periodical custom action. As result I have double threads running in jvm and making the same things! That was obviousely not my real intention. From the other hand when I launch that initializer from common servlet (not loaded on startup) the problem is not present. The most strange thing about it is that in both cases all classes are loaded with the same ClassLoader. I cannot understand is it a bug or just I don't understand something. Please help. --Che
Double loading when loading servlet on startup
Hi problem is that when I mark servlets as load-on-startup they are loaded twice in jvm. I want this servlet to serve as initializer i.e. to initialize some other classes in its init method. The worst is that that classes are double loaded too. I.e. I want to init class which is Thread subclass to perform periodical custom action. As result I have double threads running in jvm and making the same things! That was obviousely not my real intention. From the other hand when I launch that initializer from common servlet (not loaded on startup) the problem is not present. The most strange thing about it is that in both cases all classes are loaded with the same ClassLoader. I cannot understand is it a bug or just I don't understand something. Please help. --Che
Re: Double loading when loading servlet on startup
What version of tomcat? Alexander Cherinko wrote: Hi problem is that when I mark servlets as load-on-startup they are loaded twice in jvm. I want this servlet to serve as initializer i.e. to initialize some other classes in its init method. The worst is that that classes are double loaded too. I.e. I want to init class which is Thread subclass to perform periodical custom action. As result I have double threads running in jvm and making the same things! That was obviousely not my real intention. From the other hand when I launch that initializer from common servlet (not loaded on startup) the problem is not present. The most strange thing about it is that in both cases all classes are loaded with the same ClassLoader. I cannot understand is it a bug or just I don't understand something. Please help. --Che
RE: Double loading when loading servlet on startup
Got the same problem :(( (on v3.2.3 - NT) -Message d'origine- De : Alexander Cherinko [mailto:[EMAIL PROTECTED]] Envoye : mercredi 8 aout 2001 16:38 A : [EMAIL PROTECTED] Objet : Double loading when loading servlet on startup Hi problem is that when I mark servlets as load-on-startup they are loaded twice in jvm. I want this servlet to serve as initializer i.e. to initialize some other classes in its init method. The worst is that that classes are double loaded too. I.e. I want to init class which is Thread subclass to perform periodical custom action. As result I have double threads running in jvm and making the same things! That was obviousely not my real intention. From the other hand when I launch that initializer from common servlet (not loaded on startup) the problem is not present. The most strange thing about it is that in both cases all classes are loaded with the same ClassLoader. I cannot understand is it a bug or just I don't understand something. Please help. --Che
RE: Double loading when loading servlet on startup
In the past, the cases of double loading I've seen have all been because an auto-loaded context (created by AutoSetup from the webapps directory) was also manually loaded as a second context, i.e. Context path=/othercontext docBase=webapps/examples ... Each context gets its own instance of servlets. As a result, init() is called twice, once for each context. There isn't enough information below to tell if this is the source of the double-loading. Cheers, Larry -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]] Sent: Wednesday, August 08, 2001 12:32 PM To: [EMAIL PROTECTED] Subject: RE: Double loading when loading servlet on startup Got the same problem :(( (on v3.2.3 - NT) -Message d'origine- De : Alexander Cherinko [mailto:[EMAIL PROTECTED]] Envoye : mercredi 8 aout 2001 16:38 A : [EMAIL PROTECTED] Objet : Double loading when loading servlet on startup Hi problem is that when I mark servlets as load-on-startup they are loaded twice in jvm. I want this servlet to serve as initializer i.e. to initialize some other classes in its init method. The worst is that that classes are double loaded too. I.e. I want to init class which is Thread subclass to perform periodical custom action. As result I have double threads running in jvm and making the same things! That was obviousely not my real intention. From the other hand when I launch that initializer from common servlet (not loaded on startup) the problem is not present. The most strange thing about it is that in both cases all classes are loaded with the same ClassLoader. I cannot understand is it a bug or just I don't understand something. Please help. --Che
RE: Double loading when loading servlet on startup
3.2.1 on NT/Linux. I had the same problem on earlier versions. And Loic Lefevre [[EMAIL PROTECTED]] has got the same on NT with v.3.2.3. --Che -Original Message- From: Mike McGuinness [mailto:[EMAIL PROTECTED]] Sent: Wednesday, August 08, 2001 7:14 PM To: [EMAIL PROTECTED] Subject: Re: Double loading when loading servlet on startup What version of tomcat? Alexander Cherinko wrote: Hi problem is that when I mark servlets as load-on-startup they are loaded twice in jvm. I want this servlet to serve as initializer i.e. to initialize some other classes in its init method. The worst is that that classes are double loaded too. I.e. I want to init class which is Thread subclass to perform periodical custom action. As result I have double threads running in jvm and making the same things! That was obviousely not my real intention. From the other hand when I launch that initializer from common servlet (not loaded on startup) the problem is not present. The most strange thing about it is that in both cases all classes are loaded with the same ClassLoader. I cannot understand is it a bug or just I don't understand something. Please help. --Che
RE: Double loading when loading servlet on startup
The case: Nt/Linux v3.2.1,2,3. There is one context: Context path=/ts docBase=webapps/ts crossContext=true debug=1 reloadable=true(or false) trusted=false /Context The web.xml piece for this context servlet servlet-nameLoader/servlet-name servlet-classLoader/servlet-class load-on-startup1/load-on-startup /servlet jdb shows double classes named Loader loaded with different instances of org.apache.tomcat.loader.AdaptiveClassLoader12 which have generation field 2 and 4 correspondingly. If I call Class.forName(MyClass) in init method of servlet and MyClass is subclass of thread I have double threads. And so on. gc gets nothing and trying to interrupt threads in servlet's destroy method gets nothing as well. And this occurs only when servlet is marked as load-on-startup. For ordinary servlet there is nothing like this. --Che -Original Message- From: Larry Isaacs [mailto:[EMAIL PROTECTED]] Sent: Wednesday, August 08, 2001 7:58 PM To: '[EMAIL PROTECTED]' Subject: RE: Double loading when loading servlet on startup In the past, the cases of double loading I've seen have all been because an auto-loaded context (created by AutoSetup from the webapps directory) was also manually loaded as a second context, i.e. Context path=/othercontext docBase=webapps/examples ... Each context gets its own instance of servlets. As a result, init() is called twice, once for each context. There isn't enough information below to tell if this is the source of the double-loading. Cheers, Larry -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]] Sent: Wednesday, August 08, 2001 12:32 PM To: [EMAIL PROTECTED] Subject: RE: Double loading when loading servlet on startup Got the same problem :(( (on v3.2.3 - NT) -Message d'origine- De : Alexander Cherinko [mailto:[EMAIL PROTECTED]] Envoye : mercredi 8 aout 2001 16:38 A : [EMAIL PROTECTED] Objet : Double loading when loading servlet on startup Hi problem is that when I mark servlets as load-on-startup they are loaded twice in jvm. I want this servlet to serve as initializer i.e. to initialize some other classes in its init method. The worst is that that classes are double loaded too. I.e. I want to init class which is Thread subclass to perform periodical custom action. As result I have double threads running in jvm and making the same things! That was obviousely not my real intention. From the other hand when I launch that initializer from common servlet (not loaded on startup) the problem is not present. The most strange thing about it is that in both cases all classes are loaded with the same ClassLoader. I cannot understand is it a bug or just I don't understand something. Please help. --Che
RE: Double loading when loading servlet on startup
I tried this scenario with Tomcat 3.2.1 and I only get one call to init(). Are you on Windows? If your ts directory is actually named Ts, I think you would get two context's. What does your tomcat log show about contexts being added? Larry -Original Message- From: Alexander Cherinko [mailto:[EMAIL PROTECTED]] Sent: Wednesday, August 08, 2001 1:51 PM To: [EMAIL PROTECTED] Subject: RE: Double loading when loading servlet on startup The case: Nt/Linux v3.2.1,2,3. There is one context: Context path=/ts docBase=webapps/ts crossContext=true debug=1 reloadable=true(or false) trusted=false /Context The web.xml piece for this context servlet servlet-nameLoader/servlet-name servlet-classLoader/servlet-class load-on-startup1/load-on-startup /servlet jdb shows double classes named Loader loaded with different instances of org.apache.tomcat.loader.AdaptiveClassLoader12 which have generation field 2 and 4 correspondingly. If I call Class.forName(MyClass) in init method of servlet and MyClass is subclass of thread I have double threads. And so on. gc gets nothing and trying to interrupt threads in servlet's destroy method gets nothing as well. And this occurs only when servlet is marked as load-on-startup. For ordinary servlet there is nothing like this. --Che -Original Message- From: Larry Isaacs [mailto:[EMAIL PROTECTED]] Sent: Wednesday, August 08, 2001 7:58 PM To: '[EMAIL PROTECTED]' Subject: RE: Double loading when loading servlet on startup In the past, the cases of double loading I've seen have all been because an auto-loaded context (created by AutoSetup from the webapps directory) was also manually loaded as a second context, i.e. Context path=/othercontext docBase=webapps/examples ... Each context gets its own instance of servlets. As a result, init() is called twice, once for each context. There isn't enough information below to tell if this is the source of the double-loading. Cheers, Larry -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]] Sent: Wednesday, August 08, 2001 12:32 PM To: [EMAIL PROTECTED] Subject: RE: Double loading when loading servlet on startup Got the same problem :(( (on v3.2.3 - NT) -Message d'origine- De : Alexander Cherinko [mailto:[EMAIL PROTECTED]] Envoye : mercredi 8 aout 2001 16:38 A : [EMAIL PROTECTED] Objet : Double loading when loading servlet on startup Hi problem is that when I mark servlets as load-on-startup they are loaded twice in jvm. I want this servlet to serve as initializer i.e. to initialize some other classes in its init method. The worst is that that classes are double loaded too. I.e. I want to init class which is Thread subclass to perform periodical custom action. As result I have double threads running in jvm and making the same things! That was obviousely not my real intention. From the other hand when I launch that initializer from common servlet (not loaded on startup) the problem is not present. The most strange thing about it is that in both cases all classes are loaded with the same ClassLoader. I cannot understand is it a bug or just I don't understand something. Please help. --Che
Tomcat-servlet at startup
Title: Tomcat-servlet at startup Hi Tomcat loads the servlet class at startup, as far as my knowledge goes it functions properly, but when i look into tomcat.log, it is something like this, pls look at the the highlighted text, it says null, what does it mean?, and moreover, two contexts are present one empty and the other /root 2001-07-10 08:50:16 - Ctx( /examples ): Add context 2001-07-10 08:50:16 - ContextManager: Adding context Ctx( /examples ) 2001-07-10 08:50:17 - Ctx( /admin ): Add context 2001-07-10 08:50:17 - ContextManager: Adding context Ctx( /admin ) 2001-07-10 08:50:17 - Ctx( /root ): Add context 2001-07-10 08:50:17 - ContextManager: Adding context Ctx( /root ) 2001-07-10 08:50:17 - ContextManager: Engine init 2001-07-10 08:50:17 - Ctx( ): Add context 2001-07-10 08:50:17 - ContextManager: Adding context Ctx( ) 2001-07-10 08:50:17 - Ctx( /test ): Add context 2001-07-10 08:50:17 - ContextManager: Adding context Ctx( /test ) 2001-07-10 08:50:17 - Ctx( /examples ): Context Init 2001-07-10 08:50:17 - Ctx( /examples ): Pre servlet init jsp(org.apache.jasper.servlet.JspServlet/null) 2001-07-10 08:50:17 - Ctx( /examples ): Post servlet init jsp(org.apache.jasper.servlet.JspServlet/null) 2001-07-10 08:50:17 - Ctx( /admin ): Context Init 2001-07-10 08:50:17 - Ctx( /admin ): Pre servlet init jsp(org.apache.jasper.servlet.JspServlet/null) 2001-07-10 08:50:17 - Ctx( /admin ): Post servlet init jsp(org.apache.jasper.servlet.JspServlet/null) 2001-07-10 08:50:17 - Ctx( /root ): Context Init 2001-07-10 08:50:17 - Ctx( /root ): Removing duplicate servlet jsp jsp(org.apache.jasper.servlet.JspServlet/null) 2001-07-10 08:50:17 - Ctx( /root ): Removing duplicate *.jsp - jsp(org.apache.jasper.servlet.JspServlet/null) 2001-07-10 08:50:17 - Ctx( /root ): Pre servlet init HangFung(JWLStartUp.JWLLoadDefaults/null) 2001-07-10 08:50:17 - Ctx( /root ): Post servlet init HangFung(JWLStartUp.JWLLoadDefaults/null) 2001-07-10 08:50:17 - Ctx( ): Context Init 2001-07-10 08:50:17 - Ctx( ): Removing duplicate servlet jsp jsp(org.apache.jasper.servlet.JspServlet/null) 2001-07-10 08:50:17 - Ctx( ): Removing duplicate *.jsp - jsp(org.apache.jasper.servlet.JspServlet/null) 2001-07-10 08:50:17 - Ctx( ): Pre servlet init HangFung(JWLStartUp.JWLLoadDefaults/null) 2001-07-10 08:50:17 - Ctx( ): Post servlet init HangFung(JWLStartUp.JWLLoadDefaults/null) 2001-07-10 08:50:17 - Ctx( /test ): Context Init 2001-07-10 08:50:17 - Ctx( /test ): Pre servlet init jsp(org.apache.jasper.servlet.JspServlet/null) 2001-07-10 08:50:17 - Ctx( /test ): Post servlet init jsp(org.apache.jasper.servlet.JspServlet/null) 2001-07-10 08:50:19 - PoolTcpConnector: Starting HttpConnectionHandler on 8080 2001-07-10 08:50:19 - PoolTcpConnector: Starting Ajp12ConnectionHandler on 8007 2001-07-10 09:05:13 - ContextManager: Removing context Ctx( /examples ) 2001-07-10 09:05:13 - Ctx( /examples ): Remove context 2001-07-10 09:05:13 - Ctx( /examples ): Pre servlet destroy jsp(org.apache.jasper.servlet.JspServlet/null) 2001-07-10 09:05:13 - Ctx( /examples ): Post servlet destroy jsp(org.apache.jasper.servlet.JspServlet/null) 2001-07-10 09:05:13 - Ctx( /examples ): Context Shutdown 2001-07-10 09:05:13 - ContextManager: Removing context Ctx( /admin ) 2001-07-10 09:05:13 - Ctx( /admin ): Remove context 2001-07-10 09:05:13 - Ctx( /admin ): Pre servlet destroy jsp(org.apache.jasper.servlet.JspServlet/null) 2001-07-10 09:05:13 - Ctx( /admin ): Post servlet destroy jsp(org.apache.jasper.servlet.JspServlet/null) 2001-07-10 09:05:13 - Ctx( /admin ): Context Shutdown thanx in adv Lax
RE: Unable to load servlet on startup ??
Also, if you want to debug the startup of your servlet you can do whatever you want(i.e. debug output) in your servlets init() method. This is the method that gets called when a servlet is instantiated. Utilize it like you would a constructor. --- Michael Wentzel Software Developer Software As We Think - http://www.aswethink.com mailto:[EMAIL PROTECTED] - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, email: [EMAIL PROTECTED]
Unable to load servlet on startup ??
Title: Unable to load servlet on startup ?? Hi, I am trying to use Tomcat in a standalone mode. I have a working application under jrun and am trying to move it to Tomcat. I am trying to use my existing directory structure and hence am not using the /webapps/ path. I have a servlet which i need to load on startup. This servlet reads a properties files. I have this information (load-on-startup and param name/value) in the web.xml file in the conf directory. I have added a context /context block in the server.xml file. I have all the necessary jars and class files in the CLASSPATH. However, when tomcat starts , i don't think the servlet is being loaded. How do i check if the servlet is loaded ?? What am i doing wrong ?? I donot see any errors in the log files. Any help is appreciated. Srini
RE: Unable to load servlet on startup ??
If you are using tomcat 3.2.1 or higher you have to move the web.xml file to the WEB-INF directory of your webapp since tomcat 3.2/.1 ignores the web.xml in the conf directory. Stefan
RE: Unable to load servlet on startup ??
thanks for the reply. So how do i use the WEB-ING directory without putting my app under webapps ?? Srini -Original Message-From: Stefan Langer [mailto:[EMAIL PROTECTED]]Sent: Monday, February 05, 2001 4:02 PMTo: [EMAIL PROTECTED]Subject: RE: Unable to load servlet on startup ?? If you are using tomcat 3.2.1 or higher you have to move the web.xml file to the WEB-INF directory of your webapp since tomcat 3.2/.1 ignores the web.xml in the conf directory. Stefan
RE: Unable to load servlet on startup ??
Sorry for the confusion but with webapp I actually ment your webapplication. The WEB-INF directory goes in the root folder of your webapplication. Example: Suppose you have a webapplication called foo and you have added a context for it to server.xml similar to this Context path="/foo" docBase="/base directory of your application/" crossContext="false" debug="0" reloadable="false" /Context THe WEB-INF directory would be located at /base directory of your application/WEB-INF and in this directory you drop your web.xml file. Hope that helps Stefan
loading servlet on startup
Hello, How do I go about loading a sevlet on startup? I know this is probably on the FAQ page, but unfortunately I am unable to get onto the faq page at the moment. ANy help would be great. thanks, Chris.
