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http://nagoya.apache.org/bugzilla/show_bug.cgi?id=16577 WebappClassLoader delegates to parent loader Summary: WebappClassLoader delegates to parent loader Product: Tomcat 4 Version: 4.1.18 Platform: All OS/Version: All Status: NEW Severity: Critical Priority: Other Component: Catalina AssignedTo: [EMAIL PROTECTED] ReportedBy: [EMAIL PROTECTED] Hope this is a false alarm, but here it is any way... The WebappClassLoader is supposed to check WEB-INF classes and jar files before consulting its parent loader. This is the basis for overriding many a library on a per-context basis. The following test servlet demonstrates the problem: import java.io.*; import javax.servlet.*; import javax.servlet.http.*; /** * */ public class ClassStats extends HttpServlet { public void doGet( HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException { response.setContentType("text/html"); PrintWriter out = response.getWriter(); out.println("<html>"); out.println("<head>"); out.println("<title>" + getClass().getName() + "</title>"); out.println("</head>"); out.println("<body bgcolor=\"white\">"); String className = request.getQueryString(); try { Class clazz = Class.forName(className); out.println( "<table cellpadding=\"5\" cellspacing=\"10\" border=\"2\">"); printNameValue("Name", className, out); printNameValue("ClassLoader", clazz.getClassLoader(), out); printNameValue( "Location", clazz.getProtectionDomain().getCodeSource().getLocation(), out); out.println("</table>"); } catch (Exception x) { out.println("Encountered exception:"); out.println("<pre>"); x.printStackTrace(out); out.println("</pre>"); } out.println("</body>"); out.println("</html>"); } private void printNameValue(String name, Object value, PrintWriter out) { out.println("<tr>"); out.println("<td>"); out.println(name); out.println("</td>"); out.println("<td>"); out.println(value); out.println("</td>"); out.println("</tr>"); } } The above servlet prints the location from which a given class (specified in the query string) is loaded. Including the activation.jar file in the lib directory of the context in which the above servlet is defined, for example, should yield something like file:/<absolute path to context>/WEB-INF/lib/activation.jar It doesn't. Instead we get something like file:/<CATALINA HOME>/commons/lib/activation.jar As a reality-check, I *have* checked this behavior against Tomcat 4.0.3, and the behavior there is correct. -Babak. --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
