Re: [jetty-users] Validation Errors after update from 9.0 to 9.2

[Lothar Kimmeringer <job@xxxxxxxxxxxxxx>]

Am 07.05.2015 um 14:38 schrieb Joakim Erdfelt:
> Yow ... web-app_2_3.dtd
> 
> That was part of J2EE 1.3, back in Sept 2001
> <http://en.wikipedia.org/wiki/Java_EE_version_history#J2EE_1.3_.28September_24.2C_2001.29>.

I know. That was the status when the first version of our app
was published ;-)

> Ok, this old of a web dtd isn't tested by our own tests it seems.
> But we do have that dtd in our jetty-schemas.jar <https://github.com/eclipse/jetty.toolchain/blob/master/jetty-schemas/src/main/resources/javax/servlet/resources/web-app_2_3.dtd>
> Which the jetty-webapp.jar and its org.eclipse.jetty.webapp.WebDescriptor.class knows about <https://github.com/eclipse/jetty.project/blob/jetty-9.2.10.v20150310/jetty-webapp/src/main/java/org/eclipse/jetty/webapp/WebDescriptor.java#L93> and sets up for internal redirect <https://github.com/eclipse/jetty.project/blob/jetty-9.2.10.v20150310/jetty-webapp/src/main/java/org/eclipse/jetty/webapp/WebDescriptor.java#L145-L147>.

I've seen that part in the source of WebDescriptor-class before
asking the question since I haven't seen a way to add my own
redirections (and I already have these files residing in my
installation - just in another directory than javax/servlet/)

> So I gotta ask, how are you using jetty?

Embedded into an application to provide HTTP-functionalities
using the jetty-all.jar and additional jars for servlets and JSP.
First version was AFAIR version 4.

> If embedded, or maven plugin, or just about anything that isn't the
> jetty-distribution, then what are the dependencies you use?

We're not using Maven so we replace the old jars residing in
lib/jetty by new ones. After that we start our testcases and
check, what's failing. Since all major version changes came
with completely new APIs, we end up with compile-errors most
of the time anyway, so it's expected to be a manual process
and there is no real advantage to use Maven for that.

> Or ... can you upgrade the WEB-INF/web.xml to say servlet spec 2.5
> at least? (this error will go away)

I can do that for the set of config-files that we include with
new installations but I try to avoid to be forced to change them
with existing ones since they might have been changed by their
corresponding users and I don't want to create a "know-it-all"-
parser that is able to change these files in all circumstances.
I already had this kind of "fun" with the changed syntax of the
jetty-configuration-files between Jetty 7 and Jetty 9.0 and -
now again - between 9.0 and 9.2

The Jar solved my immediate problem but I still would like to know
how I can add my own redirections as part of Jetty being embedded
that is something more standard than

    try{
        WebDescriptor wd = new WebDescriptor(Resource.newResource("")){
            @Override
            public void ensureParser() throws ClassNotFoundException {
                super.ensureParser();
                _parserSingleton.redirectEntity("mywebdtd1.dtd",dtd1);
                _parserSingleton.redirectEntity("mywebdtd2.dtd",dtd1);
                _parserSingleton.redirectEntity("mywebdtd3.dtd",dtd1);
                _parserSingleton.redirectEntity("mywebdtd4.dtd",dtd1);
                _parserSingleton.redirectEntity("mywebdtd5.dtd",dtd1);
            }
        };
        wd.ensureParser();
    }
    catch(Exception e){
        e.printStackTrace();
    }

... which doesn't work in all circumstances.


Cheers, Lothar