thank you @Colin 

I started by  upgrading gwt Only  from version 2.8.2 To 2.10.0 and I kept 
java 8 and  GXT 2.3.1a-gwt22
In  my jetty-env.xml file  i had  org.eclipse.jetty.webapp.WebAppContext as 
a configurationClass, so It cause fd ollowing error when launching 
java.lang.ClassNotFoundException: 
org.eclipse.jetty.webapp.WebAppContext
at java.lang.ClassLoader.findClass(ClassLoader.java:523)
at java.lang.ClassLoader.loadClass(ClassLoader.java:418)
at java.lang.ClassLoader.loadClass(ClassLoader.java:351)
at 
org.eclipse.jetty.webapp.WebAppClassLoader.loadClass(WebAppClassLoader.java:487)
at 
com.google.gwt.dev.shell.jetty.JettyLauncher$WebAppContextWithReload$WebAppClassLoaderExtension.loadClass(JettyLauncher.java:458)
at java.lang.ClassLoader.loadClass(ClassLoader.java:351)
at org.eclipse.jetty.util.Loader.loadClass(Loader.java:64)
at 
org.eclipse.jetty.xml.XmlConfiguration$JettyXmlConfiguration.nodeClass(XmlConfiguration.java:477)
at 
org.eclipse.jetty.xml.XmlConfiguration$JettyXmlConfiguration.configure(XmlConfiguration.java:417)
at 
org.eclipse.jetty.xml.XmlConfiguration.configure(XmlConfiguration.java:364)
at 
org.eclipse.jetty.plus.webapp.EnvConfiguration.lambda$configure$0(EnvConfiguration.java:120)
at 
org.eclipse.jetty.webapp.WebAppClassLoader.runWithServerClassAccess(WebAppClassLoader.java:138)
at 
org.eclipse.jetty.plus.webapp.EnvConfiguration.configure(EnvConfiguration.java:118)
at org.eclipse.jetty.webapp.WebAppContext.configure(WebAppContext.java:498)
at 
org.eclipse.jetty.webapp.WebAppContext.startContext(WebAppContext.java:1409)
at 
org.eclipse.jetty.server.handler.ContextHandler.doStart(ContextHandler.java:910)
at 
org.eclipse.jetty.servlet.ServletContextHandler.doStart(ServletContextHandler.java:288)
at org.eclipse.jetty.webapp.WebAppContext.doStart(WebAppContext.java:524)
at 
com.google.gwt.dev.shell.jetty.JettyLauncher$WebAppContextWithReload.doStart(JettyLauncher.java:568)
at 
org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:73)
at 
org.eclipse.jetty.util.component.ContainerLifeCycle.start(ContainerLifeCycle.java:169)
at 
org.eclipse.jetty.util.component.ContainerLifeCycle.doStart(ContainerLifeCycle.java:110)
at 
org.eclipse.jetty.server.handler.AbstractHandler.doStart(AbstractHandler.java:97)
at 
org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:73)
at 
org.eclipse.jetty.util.component.ContainerLifeCycle.start(ContainerLifeCycle.java:169)
at org.eclipse.jetty.server.Server.start(Server.java:423)
at 
org.eclipse.jetty.util.component.ContainerLifeCycle.doStart(ContainerLifeCycle.java:110)
at 
org.eclipse.jetty.server.handler.AbstractHandler.doStart(AbstractHandler.java:97)
at org.eclipse.jetty.server.Server.doStart(Server.java:387)
at 
org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:73)
at 
com.google.gwt.dev.shell.jetty.JettyLauncher.start(JettyLauncher.java:776)
at com.google.gwt.dev.DevMode.doStartUpServer(DevMode.java:636)
at com.google.gwt.dev.DevModeBase.startUp(DevModeBase.java:898)
at com.google.gwt.dev.DevModeBase.run(DevModeBase.java:705)
at com.google.gwt.dev.DevMode.main(DevMode.java:432)
Suppressed: java.lang.ClassNotFoundException: 
org.eclipse.jetty.webapp.WebAppContext
at java.net.URLClassLoader.findClass(URLClassLoader.java:387)
at 
org.eclipse.jetty.webapp.WebAppClassLoader.findClass(WebAppClassLoader.java:629)
at 
org.eclipse.jetty.webapp.WebAppClassLoader.loadClass(WebAppClassLoader.java:511)
... 31 more

Le vendredi 26 avril 2024 à 15:28:09 UTC+2, Colin Alworth a écrit :

> You might run into issues with such an old version of GXT when using a new 
> GWT version - take a look at 
> https://groups.google.com/g/google-web-toolkit/c/If897MPqvw0/m/bSWnmuz9BwAJ 
> for a summary of how to update GXT 2.3.1a-gwt22. 
>
> With GWT updated to 2.9.0 or beyond, you will be able to run on Java 11 
> (see https://www.gwtproject.org/release-notes.html#Release_Notes_2_9_0). 
>
>
>
>
> On Friday, April 26, 2024 at 7:59:27 AM UTC-5 wejden...@gmail.com wrote:
>
>> Many thanks @frank Hossfeld, 
>> I am so excited to start it .. it is clear 
>> please feel free to share any references or links that can help me in 
>> that adventure .
>>
>> thank you
>> wm
>>
>> Le ven. 26 avr. 2024 à 11:50, 'Frank Hossfeld' via GWT Users <
>> google-we...@googlegroups.com> a écrit :
>>
>>> GWT 2.8.2 is pretty old - nearly seven years - and i am not sure, if the 
>>> GWT 2.8.2 will work with Java 11
>>>
>>> Migrating to the latest version of GWT will give you some benefits. IIRC 
>>> GWT 2.8.2 generates at least 5 JS-files where GWT 2.11.0 only generates 2. 
>>> This will speed up the build. Also, there is a security issue in older GWT 
>>> versions (in case you are using RPC). 
>>>
>>> To do so, separate your code in client-, shared- and server-modules (as 
>>> Craig already mentioned).  Take a look here: 
>>> https://github.com/tbroyer/gwt-maven-archetypes or here 
>>> https://github.com/NaluKit/gwt-maven-springboot-archetype. This should 
>>> give you an idea, how your project look like after the separation. Once 
>>> done, it should be possible to use different Java versions on the client 
>>> and server side.
>>>
>>> Once you have separate your code, you can update the GWT version. My 
>>> first step would be to update to GWT 2.10.0. I would do this, because to 
>>> GWT 2.10.0 works with the old javax stuff on the server side and give you 
>>> the opportunity to patch GXT without updating the server stuff.  (IIRC you 
>>> need to patch two classes). After the patch you can move to GWT 2.11.0 and 
>>> Java 11 and fix the other issues by updating versions, etc.
>>>
>>> Wejden Mrabti schrieb am Freitag, 26. April 2024 um 09:12:33 UTC+2:
>>>
>>>> thank you for your answer @craig Mitchell
>>>> if i want to continue hibernate 6 , how to do launch gwt application on 
>>>> java 11 ? 
>>>> is it possible to continue working like this ? what do you think?
>>>> Le vendredi 26 avril 2024 à 02:22:52 UTC+2, Craig Mitchell a écrit :
>>>>
>>>>> It'd be hard to answer that question, as we don't have all the 
>>>>> details.  As this is a GWT forum, I'd say, migrate GWT to the latest 
>>>>> version first.  But that might actually be bad advice, just depends on 
>>>>> your 
>>>>> project.
>>>>>
>>>>> My gut feel is you'd be best to decouple the front end and back end 
>>>>> first.
>>>>>
>>>>> On Friday 26 April 2024 at 2:32:17 am UTC+10 Wejden Mrabti wrote:
>>>>>
>>>>>> Hello GWT Users Community,
>>>>>>
>>>>>> I'm currently working on a large legacy application stack, using Java 
>>>>>> 8, Hibernate version 5.3.20.Final, and Hibernate Search 5.11.5.Final. 
>>>>>> Our 
>>>>>> frontend technology stack includes GWT version 2.8.2 and GXT version 
>>>>>> 2.3.1a-gwt22. Fontend and backend arent well de-coupled.
>>>>>>
>>>>>> In my initial approach to modernize the application, I began by 
>>>>>> migrating Hibernate to version 6.2, assuming it would be the easiest 
>>>>>> step. 
>>>>>> However, I encountered an issue where Hibernate 6.2 requires 
>>>>>> transitioning 
>>>>>> to Jakarta Persistence. When attempting to compile parts of my codebase, 
>>>>>> I 
>>>>>> received the following error:
>>>>>>
>>>>>> java.lang.UnsupportedClassVersionError: jakarta/persistence/Transient 
>>>>>> has been compiled by a more recent version of the Java Runtime (class 
>>>>>> file 
>>>>>> version 55.0), this version of the Java Runtime only recognizes class 
>>>>>> file 
>>>>>> versions up to 52.0
>>>>>>
>>>>>> This suggests that I need to execute my code with JDK 11. However, 
>>>>>> when attempting to do so, I encountered the following issue:
>>>>>>
>>>>>> [ERROR] Found resouce but unrecognized URL format: 
>>>>>> 'jrt:/java.sql/javax/sql/DataSource.class' 
>>>>>> java.lang.NoClassDefFoundError: 
>>>>>> javax/sql/DataSource
>>>>>>
>>>>>> After reviewing your discussions in the GWT contributors group, I'm 
>>>>>> questioning whether starting with the Hibernate migration is the right 
>>>>>> approach. Should I instead prioritize migrating Java or perhaps GWT? I 
>>>>>> would greatly appreciate your insights and advice based on your 
>>>>>> experiences.
>>>>>>
>>>>>> Thank you,
>>>>>>
>>>>>> WM
>>>>>>
>>>>> -- 
>>> You received this message because you are subscribed to the Google 
>>> Groups "GWT Users" group.
>>> To unsubscribe from this group and stop receiving emails from it, send 
>>> an email to google-web-tool...@googlegroups.com.
>>> To view this discussion on the web visit 
>>> https://groups.google.com/d/msgid/google-web-toolkit/a91eb3fa-af37-4c37-bc61-010bbd151763n%40googlegroups.com
>>>  
>>> <https://groups.google.com/d/msgid/google-web-toolkit/a91eb3fa-af37-4c37-bc61-010bbd151763n%40googlegroups.com?utm_medium=email&utm_source=footer>
>>> .
>>>
>>
>>
>> -- 
>>
>> *Best Regards,*
>> *Wejden MRABTI*
>>
>> Ingénieur étude et développement
>>
>

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