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I was searching for text "Successfully compiled web service client code". Resource Bundle Lookup didn't find anything. I found it in websvc/registry/extsrc/org/netbeans/modules/websvc/registry/util/Bundle.properties, key WS_CLIENTWRAPPER_COMPILE_OK.
I am sorry but classes from org/netbeans/modules/websvc/registry/** are loaded by a special classloader. That's why these classes are not visible for NetBeans SystemClassloader which we use to search for bundle properties.
Possibly it should be resolved when issue 53898 is fixed (external libraries handled by module system).