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Server plugin must be able to say what source path it uses for the JSP. E.g. ReferenceType for the JSP page <web root>/dir/pageName.jsp has source path dir/pageName.jsp when debugged on Tomcat and source path jsp_servlet/_dir/pageName.jsp when debugged on WL.
don't remember all, but isn't it achieved via org.netbeans.modules.j2ee.deployment.plugins.api.FindJSPServlet Each server should implement that and register it in optional factory.
this reads like a dup of issue 66407. since both are pretty sparce, you may want to make the requests a bit clearer
Related to #196959 - once this is done the plugin/j2eeserver will implement the SPI.