StartupScriptLauncher.java

package jruby.ext;

import java.util.Arrays;
import javax.servlet.ServletContext;
import javax.servlet.ServletContextEvent;
import javax.servlet.ServletContextListener;
import org.jruby.embed.ScriptingContainer;

/**
 * Launch a Ruby script at web application startup. To wire up this
 * listener, add
 * <listener-class>jruby.ext.StartupScriptLauncher</listener-class> to your
 * application's web.xml file.
 *
 * @author nicksieger
 */
public class StartupScriptLauncher implements ServletContextListener {
    public void contextInitialized(ServletContextEvent event) {
        ServletContext servletContext = event.getServletContext();
        ScriptingContainer container = new ScriptingContainer();

        try {
            container.setLoadPaths(Arrays.asList(new String[] {
                // set up any $LOAD_PATH items here
                servletContext.getRealPath("/WEB-INF"),
                servletContext.getRealPath("/WEB-INF/lib")
            }));

            // setup any global variables
            container.put("$servlet_context", servletContext);

            // require e.g., WEB-INF/config/startup.rb
            container.runScriptlet("require 'config/startup'");
        } catch (Exception ex) {
            ex.printStackTrace();
            servletContext.log(ex.getMessage());
        } finally {
            container.terminate();
        }
    }

    public void contextDestroyed(ServletContextEvent event) {
    }
}

I've successfully added the class to my war file, but the startup script doesn't seem to be run or output an error.

Also, to compile the code I had to put

Ruby runtime = null;

into line 21, to avoid errors.

Hmm. Does the file live in WEB-INF/classes/jruby/ext/StartupScriptLauncher.class inside the war file? That's the expected location. If you make a rails_root/classes directory, you may need to tell Warbler about it if you didn't already by adding "classes" to the array of directory names in "config.dirs" inside config/warble.rb. /Nick

…

On Thu, Sep 22, 2011 at 2:15 PM, Chris Weis ***@***.*** wrote: I put the necessary line into web.xml.erb and added this file into rails_root/classes and included that directory in the war file, but when I try to start the web server, it now complains, that the class jruby.ext.StartupScriptLauncher couldn't be found. Did I configure something wrong? ## Reply to this email directly or view it on GitHub: https://gist.github.com/23909

The wrong directory structure was the first problem, I found that out by looking at a similar java class and its documentation. Now tomcat does not error out anymore but seems to actually find the launcher. It just doesn't seem to launch the corresponding script.

Hmm. Can you try this updated version that uses org.jruby.embed instead? You can also figure out what scripts are getting loaded by adding

System.setProperty("jruby.debug.loadService", "true");

at the beginning of the contextInitialized method.