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List:       tomcat-user
Subject:    Sharing an object between two webapps
From:       Kaspar Fischer <fischerk () inf ! ethz ! ch>
Date:       2007-11-23 16:07:31
Message-ID: 0EFBD37E-AAB0-4EE3-B4BC-80AF1C0D6330 () inf ! ethz ! ch
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Hi everybody,

I need to share an object between two webapps A and B. How can I  
accomplish this?

My first webapp, A, has a class SharedObjectHolder with a static  
public member:

  public class SharedObjectHolder {
   public static Object objectToShare;
   public void setObjectToShare(Object objectToShare)
   {
     SharedObjectHolder.objectToShare = objectToShare;
   }
  }

and my webbapp A calls setObjectToShare(...). After this, webapp B does

   System.err.println(SharedObjectHolder.objectToShare);

and this is null. The same statement in webapp A returns something  
nonnull.

Looking at http://www.nabble.com/Object-sharing-tf1652024.html#a4475590,
it seems that two instances of SharedObjectHolder exist. Is this  
correct?

How can I tell Tomcat to not create two instances but use the same from
both webapp A and webapp B?

I guess this is related to classloaders, but do not know how to proceed.

Thank you very much for any hint!

Kaspar

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