Comments on: Fast Swap in WebLogic 10.3 (and JDeveloper 11g) – redeploy after compile in running application

By: Asmit

Asmit — Fri, 03 Jun 2011 17:00:37 +0000

Can someone please tel me if fastswap feature is possible on WLS in production mode?

By: lwpro2

lwpro2 — Thu, 09 Dec 2010 07:33:30 +0000

some people call it hot swap. it’s not proprietary with WLS, nor jDeveloper. It’s actually a feature called JDPA, since java 1.4.
It helps a lot for developers.

By: Florin POP

Florin POP — Wed, 20 Jan 2010 09:48:31 +0000

nice feature… to bad it doesn’t work
ps: it works in debug mode i must say… but this ain’t new

By: Kenton Ho

Kenton Ho — Thu, 02 Jul 2009 20:58:09 +0000

I’m wondering whether anyone got this working on OSX 10.5.7 (JDK 1.6.0_13)?

Seems there’s an issue with the ClassRedefinerFactory:

weblogic.application.ModuleException: Cannot initailize ClassRedefinerFactory
at weblogic.servlet.internal.WebAppModule.loadFastSwapClassloader(WebAppModule.java:1620)
at weblogic.servlet.internal.WebAppModule.prepare(WebAppModule.java:336)
at weblogic.application.internal.flow.ScopedModuleDriver.prepare(ScopedModuleDriver.java:176)
at weblogic.application.internal.flow.ModuleListenerInvoker.prepare(ModuleListenerInvoker.java:93)
at weblogic.application.internal.flow.DeploymentCallbackFlow$1.next(DeploymentCallbackFlow.java:387)
Truncated. see log file for complete stacktrace
java.io.IOException: well-known file is not secure
at sun.tools.attach.MacosxVirtualMachine.checkPermissions(Native Method)
at sun.tools.attach.MacosxVirtualMachine.(MacosxVirtualMachine.java:93)
at sun.tools.attach.MacosxAttachProvider.attachVirtualMachine(MacosxAttachProvider.java:47)
at com.sun.tools.attach.VirtualMachine.attach(VirtualMachine.java:237)
at com.bea.wls.redef.AttachUtils.findVirtualMachine(AttachUtils.java:125)
Truncated. see log file for complete stacktrace
>

By: George Maggessy

George Maggessy — Mon, 29 Jun 2009 16:45:34 +0000

I understand how nice this feature is, but I personally prefer to start my app in debug mode and make the changes I need in any class and/or jspx file. Once you manually recompile the class you see the changes on your app. The only limitation on debug mode, is that you have to restart your app when adding new bindings to your page.

By: Jean-Philippe Melanson

Jean-Philippe Melanson — Mon, 29 Jun 2009 02:13:34 +0000

This is a great feature when you have a huge app that take ages to redeploy!

Moreover, a colleague of mine found out you aren’t required to configure anything in 11g, you just have to “make” (Ctrl-Shft-9) the class again and sometimes it works (e.g. changing code inside a function), sometime it won’t (e.g. renaming a function).