RE: Webapp load order tomcat 4 vs tomcat 5
From: King, Sean [mailto:[EMAIL PROTECTED] For the application to run correctly, app2 must be deployed and start before app1. Using tomcat 5 this does not seem to be a problem. When I start tomcat, app2 is deployed and then app1 starts and is able to access jars in app2. I am hoping that this start order is not just pure chance!! It is, indeed, pure chance. I am now trying to port the application back to tomcat 4. Unfortunately I am consistently seeing that app1 starts first and then app2 is deployed from the war. Since app1 depends on app2 this is a major problem. Is there any way in tomcat 4 to force the war file to be deployed first? Hack the Tomcat source and recompile :-). More seriously, no, you can't rely on the startup order of webapps. As I recall, you can't even assume that only one will be started at one time (I'm sure the more experienced list members will correct me if the spec disallows this). You can try playing around with filenames until the order magically reverses, or you can amend the apps so that app1 doesn't need to access jars in app2 (which is, anyway, a bit unpleasant). Can you give us more information about why app1 needs app2 to start first? There may well be ways round the problem. - Peter - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: Webapp load order tomcat 4 vs tomcat 5
Webapp load order is indeed pretty much by chance. No guarantee has ever been made regarding any start order. I would recommend you add code to app1 so it can gracefully deal with the chance app2 is not available. --David King, Sean wrote: Hi all, I have two webapps that need to interact with each other. One is a fully expanded webapp ( app1 ) and the other is expanded from a war file ( app2.war ). For the application to run correctly, app2 must be deployed and start before app1. Using tomcat 5 this does not seem to be a problem. When I start tomcat, app2 is deployed and then app1 starts and is able to access jars in app2. I am hoping that this start order is not just pure chance!! I am now trying to port the application back to tomcat 4. Unfortunately I am consistently seeing that app1 starts first and then app2 is deployed from the war. Since app1 depends on app2 this is a major problem. Is there any way in tomcat 4 to force the war file to be deployed first? Any help would be greatly appreciated. Regards. Sean King Computer Associates Software Engineer Tel: +1 603 334 2168 Fax: +1 603 334 2934 [EMAIL PROTECTED] - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: Webapp load order tomcat 4 vs tomcat 5
Sean, From your description, it seems that communication between the 2 apps is done over the wire. If that is the case, why not run each under a separate JVM/Application Server to avoid the class loading conflict. King, Sean wrote: Without giving away too much information... I am working on an integration between the application that I develop and a third party application. A requirement of the integration is that my app receive unsolicited notifications from the third party app relating to status changes. This is achieved via a Muse webservice. The third party developers have provided my with all of the required Muse stuff in a war file. The war file contains a class that registers and maintains connections between my app and the other. So, to cut a long story short, my app needs to register with the supplied web app for the integration to work. This seems to work seamlessly with tomcat5 and this methodology is what we are planning to go into production with. Now it sounds like a bad idea!! -Original Message- From: Peter Crowther [mailto:[EMAIL PROTECTED] Sent: Thursday, October 04, 2007 9:36 AM To: Tomcat Users List Subject: RE: Webapp load order tomcat 4 vs tomcat 5 From: King, Sean [mailto:[EMAIL PROTECTED] For the application to run correctly, app2 must be deployed and start before app1. Using tomcat 5 this does not seem to be a problem. When I start tomcat, app2 is deployed and then app1 starts and is able to access jars in app2. I am hoping that this start order is not just pure chance!! It is, indeed, pure chance. I am now trying to port the application back to tomcat 4. Unfortunately I am consistently seeing that app1 starts first and then app2 is deployed from the war. Since app1 depends on app2 this is a major problem. Is there any way in tomcat 4 to force the war file to be deployed first? Hack the Tomcat source and recompile :-). More seriously, no, you can't rely on the startup order of webapps. As I recall, you can't even assume that only one will be started at one time (I'm sure the more experienced list members will correct me if the spec disallows this). You can try playing around with filenames until the order magically reverses, or you can amend the apps so that app1 doesn't need to access jars in app2 (which is, anyway, a bit unpleasant). Can you give us more information about why app1 needs app2 to start first? There may well be ways round the problem. - Peter - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] -- Regards Gabe Wong Private JVM JAVA Hosting Automation http://www.ngasi.com - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
RE: Webapp load order tomcat 4 vs tomcat 5
Without giving away too much information... I am working on an integration between the application that I develop and a third party application. A requirement of the integration is that my app receive unsolicited notifications from the third party app relating to status changes. This is achieved via a Muse webservice. The third party developers have provided my with all of the required Muse stuff in a war file. The war file contains a class that registers and maintains connections between my app and the other. So, to cut a long story short, my app needs to register with the supplied web app for the integration to work. This seems to work seamlessly with tomcat5 and this methodology is what we are planning to go into production with. Now it sounds like a bad idea!! -Original Message- From: Peter Crowther [mailto:[EMAIL PROTECTED] Sent: Thursday, October 04, 2007 9:36 AM To: Tomcat Users List Subject: RE: Webapp load order tomcat 4 vs tomcat 5 From: King, Sean [mailto:[EMAIL PROTECTED] For the application to run correctly, app2 must be deployed and start before app1. Using tomcat 5 this does not seem to be a problem. When I start tomcat, app2 is deployed and then app1 starts and is able to access jars in app2. I am hoping that this start order is not just pure chance!! It is, indeed, pure chance. I am now trying to port the application back to tomcat 4. Unfortunately I am consistently seeing that app1 starts first and then app2 is deployed from the war. Since app1 depends on app2 this is a major problem. Is there any way in tomcat 4 to force the war file to be deployed first? Hack the Tomcat source and recompile :-). More seriously, no, you can't rely on the startup order of webapps. As I recall, you can't even assume that only one will be started at one time (I'm sure the more experienced list members will correct me if the spec disallows this). You can try playing around with filenames until the order magically reverses, or you can amend the apps so that app1 doesn't need to access jars in app2 (which is, anyway, a bit unpleasant). Can you give us more information about why app1 needs app2 to start first? There may well be ways round the problem. - Peter - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: Webapp load order tomcat 4 vs tomcat 5
Actually after re-reading your post, Chuck's suggestion makes better sense. King, Sean wrote: Gabe, Could you provide a little more detail on this? Unfortunately I am no tomcat expert. How would running two JVM's help? Sean -Original Message- From: Gabe Wong [mailto:[EMAIL PROTECTED] Sent: Thursday, October 04, 2007 10:21 AM To: Tomcat Users List Subject: Re: Webapp load order tomcat 4 vs tomcat 5 Sean, From your description, it seems that communication between the 2 apps is done over the wire. If that is the case, why not run each under a separate JVM/Application Server to avoid the class loading conflict. King, Sean wrote: Without giving away too much information... I am working on an integration between the application that I develop and a third party application. A requirement of the integration is that my app receive unsolicited notifications from the third party app relating to status changes. This is achieved via a Muse webservice. The third party developers have provided my with all of the required Muse stuff in a war file. The war file contains a class that registers and maintains connections between my app and the other. So, to cut a long story short, my app needs to register with the supplied web app for the integration to work. This seems to work seamlessly with tomcat5 and this methodology is what we are planning to go into production with. Now it sounds like a bad idea!! -Original Message- From: Peter Crowther [mailto:[EMAIL PROTECTED] Sent: Thursday, October 04, 2007 9:36 AM To: Tomcat Users List Subject: RE: Webapp load order tomcat 4 vs tomcat 5 From: King, Sean [mailto:[EMAIL PROTECTED] For the application to run correctly, app2 must be deployed and start before app1. Using tomcat 5 this does not seem to be a problem. When I start tomcat, app2 is deployed and then app1 starts and is able to access jars in app2. I am hoping that this start order is not just pure chance!! It is, indeed, pure chance. I am now trying to port the application back to tomcat 4. Unfortunately I am consistently seeing that app1 starts first and then app2 is deployed from the war. Since app1 depends on app2 this is a major problem. Is there any way in tomcat 4 to force the war file to be deployed first? Hack the Tomcat source and recompile :-). More seriously, no, you can't rely on the startup order of webapps. As I recall, you can't even assume that only one will be started at one time (I'm sure the more experienced list members will correct me if the spec disallows this). You can try playing around with filenames until the order magically reverses, or you can amend the apps so that app1 doesn't need to access jars in app2 (which is, anyway, a bit unpleasant). Can you give us more information about why app1 needs app2 to start first? There may well be ways round the problem. - Peter - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] -- Regards Gabe Wong Private JVM JAVA Hosting Automation http://www.ngasi.com - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] -- Regards Gabe Wong Private JVM JAVA Hosting Automation http://www.ngasi.com - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
RE: Webapp load order tomcat 4 vs tomcat 5
From: King, Sean [mailto:[EMAIL PROTECTED] Subject: RE: Webapp load order tomcat 4 vs tomcat 5 How would running two JVM's help? It wouldn't. Your problem is one of synchronization, not classloader conflicts. You might try implementing a listener in app1 that periodically probes app2 and does the registration when app2 is available. Any notification logic would have to be held until the registration completes, of course. - Chuck THIS COMMUNICATION MAY CONTAIN CONFIDENTIAL AND/OR OTHERWISE PROPRIETARY MATERIAL and is thus for use only by the intended recipient. If you received this in error, please contact the sender and delete the e-mail and its attachments from all computers. - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
RE: Webapp load order tomcat 4 vs tomcat 5
Gabe, Could you provide a little more detail on this? Unfortunately I am no tomcat expert. How would running two JVM's help? Sean -Original Message- From: Gabe Wong [mailto:[EMAIL PROTECTED] Sent: Thursday, October 04, 2007 10:21 AM To: Tomcat Users List Subject: Re: Webapp load order tomcat 4 vs tomcat 5 Sean, From your description, it seems that communication between the 2 apps is done over the wire. If that is the case, why not run each under a separate JVM/Application Server to avoid the class loading conflict. King, Sean wrote: Without giving away too much information... I am working on an integration between the application that I develop and a third party application. A requirement of the integration is that my app receive unsolicited notifications from the third party app relating to status changes. This is achieved via a Muse webservice. The third party developers have provided my with all of the required Muse stuff in a war file. The war file contains a class that registers and maintains connections between my app and the other. So, to cut a long story short, my app needs to register with the supplied web app for the integration to work. This seems to work seamlessly with tomcat5 and this methodology is what we are planning to go into production with. Now it sounds like a bad idea!! -Original Message- From: Peter Crowther [mailto:[EMAIL PROTECTED] Sent: Thursday, October 04, 2007 9:36 AM To: Tomcat Users List Subject: RE: Webapp load order tomcat 4 vs tomcat 5 From: King, Sean [mailto:[EMAIL PROTECTED] For the application to run correctly, app2 must be deployed and start before app1. Using tomcat 5 this does not seem to be a problem. When I start tomcat, app2 is deployed and then app1 starts and is able to access jars in app2. I am hoping that this start order is not just pure chance!! It is, indeed, pure chance. I am now trying to port the application back to tomcat 4. Unfortunately I am consistently seeing that app1 starts first and then app2 is deployed from the war. Since app1 depends on app2 this is a major problem. Is there any way in tomcat 4 to force the war file to be deployed first? Hack the Tomcat source and recompile :-). More seriously, no, you can't rely on the startup order of webapps. As I recall, you can't even assume that only one will be started at one time (I'm sure the more experienced list members will correct me if the spec disallows this). You can try playing around with filenames until the order magically reverses, or you can amend the apps so that app1 doesn't need to access jars in app2 (which is, anyway, a bit unpleasant). Can you give us more information about why app1 needs app2 to start first? There may well be ways round the problem. - Peter - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] -- Regards Gabe Wong Private JVM JAVA Hosting Automation http://www.ngasi.com - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: Webapp load order tomcat 4 vs tomcat 5
-BEGIN PGP SIGNED MESSAGE- Hash: SHA1 Sean, King, Sean wrote: When I start tomcat, app2 is deployed and then app1 starts and is able to access jars in app2. Uh... care to explain what /that/ means? Why are you having one app steal JAR files out of another one? And furthermore, why would those JAR files need to be served by a running web application? I think I'm missing something crucial. - -chris -BEGIN PGP SIGNATURE- Version: GnuPG v1.4.7 (MingW32) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iD8DBQFHBRCh9CaO5/Lv0PARAjbZAKC4e7lTy+lWmujZU1yU1Fz8e4M7wgCgoqVa 9ymQIRfVGdpYkycYnchWjZo= =JSEn -END PGP SIGNATURE- - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: Webapp load order tomcat 4 vs tomcat 5
-BEGIN PGP SIGNED MESSAGE- Hash: SHA1 Sean, King, Sean wrote: So, to cut a long story short, my app needs to register with the supplied web app for the integration to work. You could always deploy them into separate TC instances. Then you can just start one of them before the other. Another option is lazy registration: wait until you actually need the other webapp in order to connect to it. If the connection is attempted before the service is available it will fail. BUT it will re-try next time. Then it doesn't matter in what order the webapps are ready. - -chris -BEGIN PGP SIGNATURE- Version: GnuPG v1.4.7 (MingW32) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iD8DBQFHBREl9CaO5/Lv0PARAtqVAKC1VaKJJNkG6Wn4QuLCictL10xc8gCfUbE0 5yGL2J/oN5g3QcMJxDr0pq4= =hIEn -END PGP SIGNATURE- - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
RE: Webapp load order tomcat 4 vs tomcat 5
Chris, It's a lomg story, but basically I am hooking into an SDK supplied by a third party. The fact that I need to access jars in another web app is their design. Sean -Original Message- From: Christopher Schultz [mailto:[EMAIL PROTECTED] Sent: Thursday, October 04, 2007 12:11 PM To: Tomcat Users List Subject: Re: Webapp load order tomcat 4 vs tomcat 5 -BEGIN PGP SIGNED MESSAGE- Hash: SHA1 Sean, King, Sean wrote: When I start tomcat, app2 is deployed and then app1 starts and is able to access jars in app2. Uh... care to explain what /that/ means? Why are you having one app steal JAR files out of another one? And furthermore, why would those JAR files need to be served by a running web application? I think I'm missing something crucial. - -chris -BEGIN PGP SIGNATURE- Version: GnuPG v1.4.7 (MingW32) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iD8DBQFHBRCh9CaO5/Lv0PARAjbZAKC4e7lTy+lWmujZU1yU1Fz8e4M7wgCgoqVa 9ymQIRfVGdpYkycYnchWjZo= =JSEn -END PGP SIGNATURE- - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: Webapp load order tomcat 4 vs tomcat 5
-BEGIN PGP SIGNED MESSAGE- Hash: SHA1 Sean, King, Sean wrote: It's a lomg story, but basically I am hooking into an SDK supplied by a third party. The fact that I need to access jars in another web app is their design. :( Ar you allowed to copy those JAR files into your own app? I realize that doesn't solve your load order problem, but at least it would de-couple them a little bit. - -chris -BEGIN PGP SIGNATURE- Version: GnuPG v1.4.7 (MingW32) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iD8DBQFHBRIf9CaO5/Lv0PARArcMAJwOlo1ftkuOrXcb63Av3QdhLX0jYQCeMz6E ORFht1qZnRZ6WIog1SImt+U= =mVHK -END PGP SIGNATURE- - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
RE: Webapp load order tomcat 4 vs tomcat 5
Chris, Unfortunately that would break the SDK. I am going to look into the route of having one webapp watch for the other one to come on line. Sean -Original Message- From: Christopher Schultz [mailto:[EMAIL PROTECTED] Sent: Thursday, October 04, 2007 12:18 PM To: Tomcat Users List Subject: Re: Webapp load order tomcat 4 vs tomcat 5 -BEGIN PGP SIGNED MESSAGE- Hash: SHA1 Sean, King, Sean wrote: It's a lomg story, but basically I am hooking into an SDK supplied by a third party. The fact that I need to access jars in another web app is their design. :( Ar you allowed to copy those JAR files into your own app? I realize that doesn't solve your load order problem, but at least it would de-couple them a little bit. - -chris -BEGIN PGP SIGNATURE- Version: GnuPG v1.4.7 (MingW32) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iD8DBQFHBRIf9CaO5/Lv0PARArcMAJwOlo1ftkuOrXcb63Av3QdhLX0jYQCeMz6E ORFht1qZnRZ6WIog1SImt+U= =mVHK -END PGP SIGNATURE- - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
RE: Webapp load order tomcat 4 vs tomcat 5
From: King, Sean [mailto:[EMAIL PROTECTED] Subject: RE: Webapp load order tomcat 4 vs tomcat 5 Unfortunately that would break the SDK. I am going to look into the route of having one webapp watch for the other one to come on line. What about not implementing another webapp, but just extending the one the 3rd party is providing? That would avoid both the synchronization and the jar access issues. - Chuck THIS COMMUNICATION MAY CONTAIN CONFIDENTIAL AND/OR OTHERWISE PROPRIETARY MATERIAL and is thus for use only by the intended recipient. If you received this in error, please contact the sender and delete the e-mail and its attachments from all computers. - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
