On Saturday, February 19, 2022 at 1:57:16 AM UTC+1 [email protected] 
wrote:

> Hi Jasper
>
> I'll be just glad if my current progress saves someone's time.
> I progress on step by step basis, so far I succeeded in Eclipse build and 
> debugging.
>
> Most of my problems were caused by combination of JDK11+ (namely modules) 
> + Gradle + Eclipse + Eclipse GWT Plugin. 
>
> Reason: GWT SDK gwt-dev.jar contains lot of classes that must not be 
> visible to Eclipse compiler, but in fact they are, causing dreaded "The 
> package org.w3c.dom is accessible from more than one module: <unnamed>, 
> java.xml" error.
> When `gradle build` is issued in command line the gwt-dev.jar from the 
> maven repository is linked, it contains exactly essential google classes 
> and nothing more. Thus the build succeeds.
>
> But when you import such project in Eclipse under JDK11+ (I use JDK17) and 
> select a GWT SDK there're lots of build errors caused by "The package is 
> accessible from more than one module"
>

Can't you somehow disable the module path or put all dependencies in the 
classpath rather than the module path?
https://help.eclipse.org/latest/index.jsp?topic=%2Forg.eclipse.jdt.doc.user%2Freference%2Fref-properties-build-path.htm&resultof%3D%2522%256a%2570%256d%2573%2522%2520%2522%256a%2570%256d%2522%2520
 

Alternatively, how about not using the Eclipse GWT Plugin?

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