dynamical class loading
can somone give me an information? I want to know if it is possible to past and load classes into web-inf/classes path without beeing forced to reload the whole webapp ? _ 10 Mo pour vos pièces jointes avec MSN Hotmail ! http://www.imagine-msn.com/hotmail/default.aspx?locale=fr-FR - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
RE: dynamical class loading
this is a complex answer that *probably* only the Tomcat devs can answer of someone knowledgable about the JVM and class loaders, so don't expect too many users to answer. i believe from my limited knowledge that you cannot reload single classes in a tomcat web application as a whole class loader is associated with a web application. i believe the problem is more to do with the JVM although I *believe* WebLogic manages it. perhaps if a dev has time to explain they will. Allistair. -Original Message- From: dumbQuestionsAsker _ [mailto:[EMAIL PROTECTED] Sent: 12 October 2005 09:11 To: tomcat-user@jakarta.apache.org Subject: dynamical class loading can somone give me an information? I want to know if it is possible to past and load classes into web-inf/classes path without beeing forced to reload the whole webapp ? _ 10 Mo pour vos pièces jointes avec MSN Hotmail ! http://www.imagine-msn.com/hotmail/default.aspx?locale=fr-FR - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] FONT SIZE=1 FACE=VERDANA,ARIAL COLOR=BLUE --- QAS Ltd. Registered in England: No 2582055 Registered in Australia: No 082 851 474 --- /FONT FONT SIZE=1 FACE=VERDANA,ARIAL COLOR=BLACK Disclaimer: The information contained within this e-mail is confidential and may be privileged. This email is intended solely for the named recipient only; if you are not authorised you must not disclose, copy, distribute, or retain this message or any part of it. If you have received this message in error please contact the sender at once so that we may take the appropriate action and avoid troubling you further. Any views expressed in this message are those of the individual sender. QAS Limited has the right lawfully to record, monitor and inspect messages between its employees and any third party. Your messages shall be subject to such lawful supervision as QAS Limited deems to be necessary in order to protect its information, its interests and its reputation. Whilst all efforts are made to safeguard Inbound and Outbound emails, QAS Limited cannot guarantee that attachments are virus free or compatible with your systems and does not accept any liability in respect of viruses or computer problems experienced. /FONT - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
RE: dynamical class loading
Thank you for your answer. You told me that it has more to deal with JVM, I tried using a URLClassLoader unsuccessfully, that's why I asked. Have a nice day(or night). @++ From: Allistair Crossley [EMAIL PROTECTED] Reply-To: Tomcat Users List tomcat-user@jakarta.apache.org To: Tomcat Users List tomcat-user@jakarta.apache.org Subject: RE: dynamical class loading Date: Wed, 12 Oct 2005 09:16:12 +0100 this is a complex answer that *probably* only the Tomcat devs can answer of someone knowledgable about the JVM and class loaders, so don't expect too many users to answer. i believe from my limited knowledge that you cannot reload single classes in a tomcat web application as a whole class loader is associated with a web application. i believe the problem is more to do with the JVM although I *believe* WebLogic manages it. perhaps if a dev has time to explain they will. Allistair. -Original Message- From: dumbQuestionsAsker _ [mailto:[EMAIL PROTECTED] Sent: 12 October 2005 09:11 To: tomcat-user@jakarta.apache.org Subject: dynamical class loading can somone give me an information? I want to know if it is possible to past and load classes into web-inf/classes path without beeing forced to reload the whole webapp ? _ 10 Mo pour vos pièces jointes avec MSN Hotmail ! http://www.imagine-msn.com/hotmail/default.aspx?locale=fr-FR - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] FONT SIZE=1 FACE=VERDANA,ARIAL COLOR=BLUE --- QAS Ltd. Registered in England: No 2582055 Registered in Australia: No 082 851 474 --- /FONT FONT SIZE=1 FACE=VERDANA,ARIAL COLOR=BLACK Disclaimer: The information contained within this e-mail is confidential and may be privileged. This email is intended solely for the named recipient only; if you are not authorised you must not disclose, copy, distribute, or retain this message or any part of it. If you have received this message in error please contact the sender at once so that we may take the appropriate action and avoid troubling you further. Any views expressed in this message are those of the individual sender. QAS Limited has the right lawfully to record, monitor and inspect messages between its employees and any third party. Your messages shall be subject to such lawful supervision as QAS Limited deems to be necessary in order to protect its information, its interests and its reputation. Whilst all efforts are made to safeguard Inbound and Outbound emails, QAS Limited cannot guarantee that attachments are virus free or compatible with your systems and does not accept any liability in respect of viruses or computer problems experienced. /FONT - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] _ Une chance par jour de gagner un voyage au soleil avec Magic Search ! http://www.magicsearch.fr - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: dynamical class loading
Hi, I used dynamic class reloading on a commercial J2EE server and, believe me, it brings far more problems than it solves. First, when you dynamically reload a class here is what can happen: webapp start under classloader instance x webapp instanciate class A and store in session session.setAttribute(someKey,someA) class A has changed on disk, classloader reload it using a special class loader and marking this class to be handled by this new classloader (y) now this code A someA = (A)session.getAttribute(someKey) will through a ClassCastException because A.getClass() != session.getAttribute(someKey).getClass() while A.getClass().getName().equals(session.getAttribute(someKey).getClass().getName()) is true :) All code involving static method/static variables is subject to such breakdown. More funny, you can end up in some condition instanciating old version of classes. Thrust me, when dynamically classloading, half of code breaks like this most of time, sometimes silently, and you end up crazy, trying to debug a code which in fact is not bugged. If your webapp is particulary slow to start and you need faster development, better take a look at unit testing of deactivate parts of your webapp when debugging! dumbQuestionsAsker _ a écrit : can somone give me an information? I want to know if it is possible to past and load classes into web-inf/classes path without beeing forced to reload the whole webapp ? _ 10 Mo pour vos pièces jointes avec MSN Hotmail ! http://www.imagine-msn.com/hotmail/default.aspx?locale=fr-FR - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
RE: dynamical class loading
Thrust me, when dynamically classloading, half of code breaks ^^ *rotfl* this has made my afternoon FONT SIZE=1 FACE=VERDANA,ARIAL COLOR=BLUE --- QAS Ltd. Registered in England: No 2582055 Registered in Australia: No 082 851 474 --- /FONT FONT SIZE=1 FACE=VERDANA,ARIAL COLOR=BLACK Disclaimer: The information contained within this e-mail is confidential and may be privileged. This email is intended solely for the named recipient only; if you are not authorised you must not disclose, copy, distribute, or retain this message or any part of it. If you have received this message in error please contact the sender at once so that we may take the appropriate action and avoid troubling you further. Any views expressed in this message are those of the individual sender. QAS Limited has the right lawfully to record, monitor and inspect messages between its employees and any third party. Your messages shall be subject to such lawful supervision as QAS Limited deems to be necessary in order to protect its information, its interests and its reputation. Whilst all efforts are made to safeguard Inbound and Outbound emails, QAS Limited cannot guarantee that attachments are virus free or compatible with your systems and does not accept any liability in respect of viruses or computer problems experienced. /FONT - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: dynamical class loading
Allistair Crossley a écrit : Thrust me, when dynamically classloading, half of code breaks ^^ *rotfl* this has made my afternoon Nice one indeed :D - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
