[Jetty-support] JSP Compilation Errors with custom class loader

[graemer <gra...@ya...>]

Hi,

I'm project lead of Grails and we embedd Jetty 6 as our embedded container
that we ship with Grails. We have a problem at the moment where Jetty is
unable to compile JSP pages.

The reason this came about is that we stopped providing the JAR files inside
the WARs /WEB-INF/lib directory, but instead we use a special class loader
that we provide to Jetty 6

Our Groovy code to bootstrap Jetty looks like this:

    def server = new Server()
    grailsServer = server
    def connectors = [new SelectChannelConnector()]
    connectors[0].setPort(serverPort)
    server.setConnectors( (Connector [])connectors )
    webContext = new WebAppContext("${basedir}/web-app",
"/${grailsAppName}")
    webContext.setDefaultsDescriptor("${grailsHome}/conf/webdefault.xml")
    webContext.setClassLoader(classLoader) /// HERE IS THE CUSTOM CLASS
LOADER SET
    webContext.setDescriptor(webXmlFile.absolutePath)
    grailsHandler = webContext
    server.setHandler( webContext ) 

The class loader itself is a URLClassLoader that has a reference to the
jasper compiler, runtime and servlet API jars. Now the rest of Grails works
fine and Grails' main view technology GSP continues to work fine. However
there are a small percentage of users who still like to use JSP for whatever
reason and for them they end up with errors like:

HTTP ERROR: 500

Unable to compile class for JSP

Generated servlet error:
/tmp/Jetty_0_0_0_0_8080_web-app__test__ccyp2v/jsp/org/apache/jsp/index_jsp.java:3:
package javax.servlet does not exist
import javax.servlet.*;
^


Generated servlet error:
/tmp/Jetty_0_0_0_0_8080_web-app__test__ccyp2v/jsp/org/apache/jsp/index_jsp.java:4:
package javax.servlet.http does not exist
import javax.servlet.http.*;
^


Generated servlet error:
/tmp/Jetty_0_0_0_0_8080_web-app__test__ccyp2v/jsp/org/apache/jsp/index_jsp.java:5:
package javax.servlet.jsp does not exist
import javax.servlet.jsp.*;
^


Generated servlet error:
/tmp/Jetty_0_0_0_0_8080_web-app__test__ccyp2v/jsp/org/apache/jsp/index_jsp.java:7:
package org.apache.jasper.runtime does not exist
public final class index_jsp extends org.apache.jasper.runtime.HttpJspBase
                                                              ^


Generated servlet error:
/tmp/Jetty_0_0_0_0_8080_web-app__test__ccyp2v/jsp/org/apache/jsp/index_jsp.java:8:
package org.apache.jasper.runtime does not exist
    implements org.apache.jasper.runtime.JspSourceDependent {
                                        ^

Now I'm not sure why this is happening as we are providing the correct class
loader to Jetty. Could it be that Jetty is not passing said class loader
over to Jasper compiler to compile the JSPs into bytecode?

We're really stumped on this one so any help would be great

Cheers

Graeme Rocher
Grails Project Lead
http://grails.org
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