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From Frank Knoll <Knoll_Fr...@web.de>
Subject how can two WebServices share the same data?
Date Mon, 11 Sep 2006 17:05:30 GMT
Dear Axis-Users and -Developers,

I have installed Axis 1.4 over Tomcat 5.5.17 over Java 1.5 and have one question and one problem:
My question is: I have two WebServices deployed in the same container which want to share
the same data (e.g. one instance of my class FileResourceHome). I figured out that this data
can be stored in a property (e.g. "TextGrid.FileResourceHome") of the ServletContext which
I can access out of any WebService deployed in the same container, right or wrong?
Here is is the code I am using so far for this scenario:

import org.apache.axis.MessageContext;
import org.apache.axis.transport.http.HTTPConstants;
import javax.servlet.http.HttpServlet;
import javax.servlet.ServletContext;
...
private static final String fileResourceHomeName = "TextGrid.FileResourceHome";
public static FileResourceHome getInstance()
{
  MessageContext messageContext = MessageContext.getCurrentContext();
  HttpServlet httpServlet = (HttpServlet)messageContext.getProperty(HTTPConstants.MC_HTTP_SERVLET);
  ServletContext servletContext = httpServlet.getServletContext();

  FileResourceHome fileResourceHome = (FileResourceHome)servletContext.getAttribute(fileResourceHomeName);
  if(fileResourceHome == null)
  {
    fileResourceHome = new FileResourceHome();
    servletContext.setAttribute(fileResourceHomeName, fileResourceHome);
  }
	
  return fileResourceHome;
}

My problem is: This code does compile, but doesn't execute, because the line
MessageContext messageContext = MessageContext.getCurrentContext();
from above results in a java.lang.reflect.InvocationTargetException. I don't understand this,
because the class MessageContext is in the file axis.jar which is stored in the webapps/axis/WEB-INF/lib
directory of my tomcat-installation.

What did I do wrong? Can someone help me, please?

Cheers
Frank

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