GWT 2.11 and Jetty 9.4.54.v20240208 error running in IntelliJ 2024.1 Ultimate

[dgeiselmanMOO]

GWT version: 2.11
Browser (with version): Chrome
Operating System: Windows 10

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Description

Build runs fine, but when trying to run the GWT Configuration for my project I am getting an error related to Jetty.

Jetty 9.4.54.v20240208 is giving me

Object of class 'com.google.gwt.dev.shell.jetty.JettyLauncher.WebAppContextWithReload' is not of type 'org.eclipse.jetty.webapp.WebAppContext'. Object Class and type Class are from different loaders

jetty-web.xml is

<Configure class="org.eclipse.jetty.webapp.WebAppContext">
 <Set name="maxFormContentSize" type="int">99999999</Set>
 <Get name="securityHandler">
   <Set name="loginService">
     <New class="org.eclipse.jetty.security.HashLoginService">
     	   <Set name="name">mutualofomaha.com</Set>
           <Set name="config"><SystemProperty name="jetty.home" default="."/>/etc/realm.properties</Set>
     </New>
   </Set>
 </Get>
</Configure>

WebAppContextWithReload is not mentioned anywhere in my project

Jetty 9.3.30.v20211001 is giving me that it requires ASM 7, and I saw in my dependencies I'm running 9+.

Steps to reproduce

Running a GWT application with Jetty and GWT 11 in IntelliJ 2024.1

VM options -Xmx2048m -Xms512m

Known workarounds

Links to further discussions

[niloc132]

I believe this is a duplicate of #9809, based on the abbreviated stack trace - can you confirm?

[jnehlmeier]

GWT 2.11 ships with Jetty 9.4.44.

The error says we have an instance of WebAppContextWithReload, provided by GWT SDK, loaded by classloader A but its superclass WebAppContext, provided by GWT SDK AND your jetty dependency, is loaded by classloader B.

Why do you have Jetty in your dependencies with scope runtime?

If you customize jetty then you likely cannot use the embedded Jetty provided by GWT SDK. Using the embedded Jetty as a full fledged application server that you can customize has been deprecated for exactly that reason. You should launch your own Jetty, deploy your server application to it and use GWT SDK to only launch SuperDevMode to compile the app to JS.