Remove operations should warn the user if the resource has any dependents ------------------------------------------------------------------------- Key: WFLY-7987 URL: https://issues.jboss.org/browse/WFLY-7987 Project: WildFly Issue Type: Task Components: Web (Undertow) Affects Versions: 10.1.0.Final Reporter: Guillermo González de Agüero Assignee: Tomaz Cerar Services may have dependents that can't work if they are not present. Removal operations should prevent, or least warn the user then he is about to remove a service that may have side effects. Take a look at this example: {code:shell} [standalone@localhost:9990 /] /subsystem=undertow/configuration=filter/response-header=test:add(header-name=X-test, header-value=test) {"outcome" => "success"} [standalone@localhost:9990 /] /subsystem=undertow/server=default-server/host=default-host/filter-ref=test:add() {"outcome" => "success"} [standalone@localhost:9990 /] /subsystem=undertow/configuration=filter/response-header=test:remove() { "outcome" => "success", "response-headers" => { "operation-requires-reload" => true, "process-state" => "reload-required" } } [standalone@localhost:9990 /] :reload() { "outcome" => "success", "result" => undefined } [standalone@localhost:9990 /] /core-service=management:read-boot-errors() { "outcome" => "success", "result" => [{ "failed-operation" => { "operation" => "add", "address" => [ ("subsystem" => "undertow"), ("server" => "default-server"), ("host" => "default-host"), ("filter-ref" => "test") ] }, "failure-description" => "{\"WFLYCTL0412: Required services that are not installed:\" => [\"jboss.undertow.filter.test\"],\"WFLYCTL0180: Services with missing/unavailable dependencies\" => [\"jboss.undertow.server.default-server.default-host.filter-ref.test is missing [jboss.undertow.filter.test]\"]}", "services-missing-dependencies" => ["jboss.undertow.server.default-server.default-host.filter-ref.test is missing [jboss.undertow.filter.test]"] }] } {code} A new Undertow filter is created and assigned to a host. The filter is then removed, but the host still needs it. The problem is only seen after a server reload. The same thing happens when you remove, i.e. the default Servlet Container or the Bean pool of the EJB subsystem. My proposal is to at least add a response head to the remove operations listing affected (dependent) services. This would complement the new WildFly 11 capability registry.