Solved.
If you need to use slf4j in your server classes, you must "promote"
slf4j classes to system classes. You do that by configuring the
WebAppContext just like this:
<Configure class="org.mortbay.jetty.webapp.WebAppContext">
<Set name="systemClasses">
<Array type="java.lang.String">
<!-- we copied these paths from jetty WebAppContext
source code ...
-->
<Item>java.</Item>
<Item>javax.servlet.</Item>
<Item>javax.xml.</Item>
<Item>org.mortbay.</Item>
<Item>org.xml.</Item>
<Item>org.w3c.</Item>
<Item>org.apache.commons.logging.</Item>
<Item>org.apache.log4j.</Item>
<!-- and ... added slf4j -->
<Item>org.slf4j.</Item>
<!-- we must promote slf4j to system classes, otherwise
gwt
hosted mode will not allow loading them due to a
policy
that don't allow server classes to be loaded from
the
outside world (see gwt JettyLauncher source code).
-->
</Array>
</Set>
</Configure>
You should put this file at /war/WEB-INF/jetty-web.xml. For more
information, see http://docs.codehaus.org/display/JETTY/jetty-web.xml
Cheers,
Célio
On Apr 13, 11:34 am, Célio <ccidral....@gmail.com> wrote:
> I have just migrated our gwt app from 1.5 to 1.6. Everything is fine
> except that slf4j classes can't be loaded on hosted mode. We actually
> use slf4j in our web app to log our own stuff. The problem is that
> the hosted mode class loader don't allow server classes to be loaded
> from the outside world. It checks the class name against a list of
> server classes that jetty hard-codes somewhere, and that list contains
> the org.slf4f package.
>
> WebAppClassLoaderExtension.findClass(String name) {
> @Override
> protected Class<?> findClass(String name) throws
> ClassNotFoundException {
> ...
> // Don't allow server classes to be loaded from the outside.
> if (isServerPath(name)) {
> throw e;
> }
> ...
> }
>
> }
>
> isServerPath is defined by the subclass:
>
> public class WebAppClassLoader
> {
> public boolean isServerPath(String name)
> {
> ...
> String[] server_classes = _context.getServerClasses();
> // if the name is in the list, return true (basically).
>
> }
>
> Where _context is a:
>
> public class WebAppContext extends Context
> {
> ...
> private String[] _serverClasses = {"-
> org.mortbay.jetty.plus.jaas.", "org.mortbay.jetty.", "org.slf4j."};
> // TODO
> hide all mortbay classes
> ...
> public String[] getServerClasses()
> {
> return _serverClasses;
> }
>
> }
>
> Does anybody know how to workaround this issue?
>
> Cheers,
>
> Célio
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