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From "Shapira, Yoav" <Yoav.Shap...@mpi.com>
Subject RE: Subclassing WebdavServlet
Date Mon, 26 Jul 2004 18:38:58 GMT

Hi,
You can subclass it, should be fine.

Yoav Shapira
Millennium Research Informatics


>-----Original Message-----
>From: Michael Wille [mailto:mwille@donerus.com]
>Sent: Monday, July 26, 2004 2:26 PM
>To: tomcat-user@jakarta.apache.org
>Subject: Subclassing WebdavServlet
>
>Hello All,
>
>I would like to know if its possible to subclass the webdav servlet
>that comes with Tomcat 5.x.  We have need of webdav in our application,
>but need to provide a different JNDI InitialContext then the file
>system.  The thought was we could just override the getResources()
>method in WebdavServlet to return our own context.
>
>What follows is a description of what we are doing:
>
>It seems there is at least one obstacle to doing this.  We would have
>to move/copy the jar files: servlets-default.jar, servlets-common.jar,
>and servlets-webdav.jar to the common/lib folder.  It seemed when we
>attempted to move the files to common/lib, all of the default webapps
>couldn't be loaded as well as some of our application servlets.  When
>we leave the servlets*.jar files in both server/lib and common/lib, an
>exception is thrown when accessing our servlet:
>
>javax.servlet.ServletException: Error instantiating servlet class
>com.test.webdav.XDav
>
>And this is caused by:
>
>java.lang.NoClassDefFoundError:
>org.apache.catalina.servlets.DefaultServlet
>
>This seems strange considering the app should have access to the
>servlets-default.jar now that it is in common.  Or is there an issue
>with libs in both server and common?
>
>Any help is hugely appreciated.
>
>Thanks!
>
>-Mike Wille
>
>Our subclassed servlet (with only test code for the InitialContext):
>
>package com.test.webdav;
>
>import javax.servlet.*;
>import javax.servlet.http.*;
>
>import javax.naming.directory.InitialDirContext;
>import javax.naming.directory.DirContext;
>
>import org.apache.catalina.servlets.*;
>
>public class XDav extends WebdavServlet  {
>
>	// need to dup this here because these have
>	// private access in apaches webdavservlet
>	protected static final String METHOD_HEAD		=
"HEAD";
>	protected static final String METHOD_PROPFIND	= "PROPFIND";
>	protected static final String METHOD_PROPPATCH	= "PROPPATCH";
>	protected static final String METHOD_MKCOL		=
"MKCOL";
>	protected static final String METHOD_COPY		=
"COPY";
>	protected static final String METHOD_MOVE		=
"MOVE";
>	protected static final String METHOD_LOCK		=
"LOCK";
>	protected static final String METHOD_UNLOCK		=
"UNLOCK";
>
>	protected Logger logger;
>
>	public void init (ServletConfig config) throws ServletException
{
>		// wake your parents
>		super.init(config);
>	}
>
>	public void destroy() {
>		// kill your parents
>		super.destroy();
>	}
>
>	/**
>	 * Get resources. This method will try to retrieve the resources
>through
>	 * JNDI first, then in the servlet context if JNDI has failed
(it
>could be
>	 * disabled). It will return null.
>	 *
>	 * @return A JNDI DirContext, or null.
>	 */
>	protected DirContext getResources() {
>
>		InitialDirContext result = null;
>
>		// Try the servlet context
>		try {
>			//result = new IntitialLibraryContext();
>			result.bind("directory 1", "directory 1");
>			result.bind("directory 2", "directory 2");
>			result.bind("directory 3", "directory 3");
>			result.bind("directory 4", "directory 4");
>			result.bind("directory 3/subdirectory 5",
"subdirectory
>5");
>
>
>		} catch(Exception e) {
>			logger.warning(UtilityTank.getErrorDetail(e));
>		}
>		return result;
>
>	}
>}



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