String not serializable exception coming for interned strings from Wicket Model (on JRockit/Weblogic)

Question

Hi, The following seems to be a bug with JRockit or Weblogic, but maybe someone on this list has seen it before and has a better workaround/solution. We have been developing a Wicket application for a government agency that is going to be used by 15k users. The application will be deployed on a Weblogic cluster running on JRockit and Red Hat. We have been experiencing strange "Model object not serializable" exceptions coming from Model and traced it back to interned (by the compiler) String objects becoming not serializable after hitting the server with a few hundred parallel users. Once the exception occurs for a given String reference it keeps coming consistently for that reference. The current workaround is a custom Model class that has an overrided setObject method which checks the object if it's instanceof Serializable and if the check fails it sets new String(object) on the Model. This eliminates the exceptions but would like a better solution to the problem. Has anyone seen anything like this?

Answer 1

I encountered the same problem using jrockit R28.0.1-21-133393-1.6.0_20-20100512-2126-linux-x86_64. After some stress to my application wicket model complains about strings not being serializable. I'm unable to replicate the situation using -Xdebug flag enabled to see what's actually passed to Model.setObject() method. It looks like my only hope is to switch back to sun jvm.