I give up. MVC baby!
On Aug 21, 2005, at 7:24 PM, Philip Weaver wrote:
How can I programmatically load servlets and servlet mappings in
Tomcat? I'm using Tomcat 5.0.28.
I'm trying to extend StandardContext to automatically map/assign a
batch of servlets from a specified jar at startup. I'm having trouble.
As I try to add these servlets programmatically as the StandardContext
is starting up, I can't get them to register/load. The servlets loaded
from the web.xml work fine, but the ones I'm trying to add
programmatically return null ObjectNames when I query
context.getServlets(). They are also ignored or not found when I get
the URL.
Here's the code I'm trying... The most relevant code is in
addServlet() below - which I'm calling after super.start().
package com.luminera.www;
import java.io.*;
import java.util.*;
import javax.management.*;
import javax.naming.*;
import javax.servlet.*;
import org.apache.catalina.*;
import org.apache.catalina.deploy.*;
import org.apache.catalina.loader.*;
import org.apache.catalina.mbeans.*;
import org.apache.catalina.startup.*;
import org.apache.catalina.util.*;
import org.apache.commons.logging.*;
import org.apache.commons.modeler.*;
import org.apache.naming.*;
import org.apache.naming.resources.*;
import org.apache.tomcat.util.compat.*;
public class StandardContext extends
org.apache.catalina.core.StandardContext {
public StandardContext() {
super();
}
public synchronized void start() throws LifecycleException {
super.start();
this.loadServlets();
String[] asServlets = this.getServlets();
for (int i = 0; i < asServlets.length; i++) {
System.out.println("known servlet: " + asServlets[i]);
}
}
private void loadServlets() {
String sParameter = this.findParameter("servlets-jar");
String sBasePath = this.getBasePath();
System.out.println("sParameter: " + sParameter);
System.out.println("sBasePath: " + sBasePath);
if ((sParameter != null) && (sBasePath != null)) {
String sJarPath = sBasePath + sParameter;
System.out.println("servlet jar path: " + sJarPath);
ClassLoader classLoader =
this.getLoader().getClassLoader();
//HashMap hashMap = ServletUtility.buildServletMap(sJarPath,
classLoader); // external lib
HashMap hashMap = new HashMap();
for (Iterator iterator = hashMap.keySet().iterator();
iterator.hasNext();) {
String sPattern = (String)iterator.next();
String sClass = (String)hashMap.get(sPattern);
this.addServlet(sPattern, sClass);
}
}
}
private void addServlet(String sPattern, String sClass) {
System.out.println("Trying to load servlet for url pattern: " +
sPattern);
Wrapper wrapper = null;
try {
String sName = sClass;
wrapper = this.createWrapper();
wrapper.setName(sName);
wrapper.setServletClass(sClass);
this.addChild(wrapper);
this.addServletMapping(sPattern, sName);
if (wrapper instanceof Lifecycle) {
((Lifecycle)wrapper).start();
}
System.out.println("succeeded");
System.out.println("sPattern: " + sPattern);
System.out.println("sName: " + sName);
} catch (Throwable throwable) {
System.out.println("failed");
Log log = LogFactory.getLog(StandardContext.class);
log.error("Failed to load servlet: " + sClass,
throwable);
this.removeServletMapping(sPattern);
this.removeChild(wrapper);
}
}
private String getBasePath() {
String docBase = null;
Container container = this;
while (container != null) {
if (container instanceof Host) {
break;
}
container = container.getParent();
}
File file = new File(getDocBase());
if (!file.isAbsolute()) {
if (container == null) {
docBase = (new File(engineBase(),
getDocBase())).getPath();
} else {
String appBase = ((Host)container).getAppBase();
file = new File(appBase);
if (!file.isAbsolute()) {
file = new File(engineBase(), appBase);
}
docBase = (new File(file,
getDocBase())).getPath();
}
} else {
docBase = file.getPath();
}
return docBase;
}
}
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