thank  you @jens for your answer 

I started by  upgrading gwt Only  from version 2.8.2 To 2.10.0 and I kept 
java 8 .
I 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 mardi 30 avril 2024 à 10:37:22 UTC+2, Jens a écrit :

> I would first focus on upgrading Java, GWT and possibly GXT if it is 
> incompatible with newest GWT. The DataSource error will go away once you 
> upgrade GWT because newer GWT versions use a newer Jetty. Keep in mind that 
> in newest GWT the use of embedded Jetty as appliction server during 
> development has been deprecated. It is preferred to use a local jetty 
> installation, a docker container or launching jetty via a build tool plugin 
> (maven / gradle).
>
> Once you have upgraded to latest GWT you have the possibility to use GWT 
> 2.11-jakarta if you need to switch to Jakarta.
>
> GWT itself only supports Hibernate 4 validation. So if the application 
> uses Hibernate validation in GWT as well, then you likely need to use 
> https://gitlab.com/ManfredTremmel/gwt-bean-validators
>
> -- J.
>
> Wejden Mrabti schrieb am Donnerstag, 25. April 2024 um 15:59:45 UTC+2:
>
>> Hello GWT 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
>>
>

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