You might want to look into using Gradle Gretty plugin for the container
service in combination with starting up SuperDevMode via command line.
On 3/11/25 12:41, Dyllan Sowers wrote:
Does anyone have an example of how to setup the embedded server with
dev mode, or even better, super dev mode? I'm upgrading a large
Gradle-based enterprise application from Spring 5 to Spring 6 and
migrated from javax to jakarta and have had constant issues from
Jetty's compatibility problems.
Any pointers would be a tremendous help. I'm currently trying to use
tomcat-catalina-10.1 as the embedded server but have not been able to
get it to start properly.
On Monday, June 17, 2024 at 9:09:58 PM UTC-5 Craig Mitchell wrote:
It's when you see crazy long command lines like that, you start to
appreaciate Maven (or Gradle). The same command in Maven is "mvn
gwt:codeserver -pl *-client" (yes, I know you see still need to
setup the launcherDir, warDir, etc in the pom.xml files, but that
seems much easier than one huge command line).
On Tuesday 18 June 2024 at 2:17:26 am UTC+10 Jens wrote:
> If using maven... [I'm not]... If not, please give us
more detail about what you are using (or intend to use).
After further investigation, much of my issues around this
seem to be that the. appropriate java command to run the
web app (or Jetty itself) is not being assembled correctly
by either Eclipse, the GWT plugin, or both. There are
various options that are needed and are not properly set.
That said, even if I do/can get that working, I don't
think that's the right approach. As you're going to
deprecate the embedded Jetty server, I should do whatever
is needed there to run my own external server(s). That's
what's unclear to me. There are ancient references to it
in the documentation at gwt.project.org
<http://gwt.project.org>, but I'm unclear on what is
really needed. Do I need to set up and run a code server
with my own Jetty or Tomcat local installation? If so,
how is that set up? Or do I need to run my own app server
(again, either Jetty or Tomcat). The web app setup is
obvious (I think... or are there special runtime
parameters to direct it to the proper code server port?).
Forgive my ignorance on this, but if this is the path
forward for GWT in general, I'd really like to see some
clear documentation on how to set this up or at least what
it is going to look like (in general, no specifics,
obviously it should involve thinking and work on my part).
Last note: I am assuming the code server will be easier to
get working with Java 17 modules because it will (in my
case) have less jar dependencies, as it only needs them
for shared and client code. That said... I might need to
run both externally to get it all sorted out. Again, my
own thinking on this isn't that clear because I'm not in
the weeds enough on what the plugin is really doing and
how things work under the hood.
To give a shorter, more direct answer: I want to develop
code in Eclipse in Java 17, and be able to run the code
server and web app any way possible, so that GWT code
compiles/recompiles as needed, and the web app can be
accessed in the browser, and I can do iterative
test-code-test-code development on a daily basis.
Traditionally GWT SDK only had the class
com.google.gwt.dev.DevMode. It is responsible to launch
classic dev mode (the one that does require an obsolete
browser plugin) or SuperDevMode together with an embedded
servlet container, by default Jetty. SuperDevMode is
implemented in class com.google.gwt.dev.codeserver.CodeServer
and DevMode basically calls this class if you request it to
launch SuperDevMode (which is the default behavior). Class
DevMode has a parameter "-noserver" which skips starting Jetty
and assumes you have your own server and deployment running.
Because we advocate running your own servlet container, e.g.
Jetty/Tomcat/..., it is enough to just launch CodeServer
yourself. However you could also continue to use class DevMode
and replace the embedded Jetty with your own implementation
using DevMode -server your.impl.of.ServletContainerLauncher.
Your own implementation could then be based on Jetty 12 for
example (and possibly jakarta)
Personally I use Gradle and have a task that just launches
CodeServer by executing a command line. I am pretty sure you
could also write a similar ANT task using your current ANT
setup. The command line looks like
com.google.gwt.dev.codeserver.CodeServer -sourceLevel 11
-strict -failOnError - bindAddress 0.0.0.0 -port 9876 -style
PRETTY -XmethodNameDisplayMode ABBREVIATED -workDir
/client-project/build/gwt/work -launcherDir
/client-project/build/gwt/war -src
/shared-project/src/main/java -src
/shared-project/src/main/resources com.example.MyGwtModule
The classpath should contain gwt-user/gwt-dev/gwt-codeserver,
all compile-time dependencies you need for GWT compilation as
well as classes + sources + resources related to your GWT UI
and DTOs. You would need to use ANT fileset/dirset/files to
include/exclude only the files of your single project that are
relevant for GWT compilation. Once you have that set of files
figured out you can run GWT CodeServer in isolation via ANT
with its own GWT focused classpath and you should not have any
trouble with other dependencies that you need on the server only.
Once you have that running, you need to decide how you want to
run a servlet container. Personaly I use Docker +
docker-compose + Jetty image + shell script.
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