trace-server: remove derived dp instances when deleting dp configs

contributes to #178

Signed-off-by: Bernd Hufmann <bernd.hufmann@ericsson.com>

Author: bhufmann

trace-server/org.eclipse.tracecompass.incubator.trace.server.jersey.rest.core/src/org/eclipse/tracecompass/incubator/internal/trace/server/jersey/rest/core/services/DataProviderService.java

@@ -1395,6 +1395,9 @@ public Response deleteDerivedProvider(
                 return Response.status(Status.NOT_FOUND).entity(NO_SUCH_PROVIDER).build();
             }
             configurator.removeDataProviderDescriptor(experiment, derivedDescriptor);
+
+            // Remove any instances of the derived data provider stored in the manager
+            DataProviderManager.getInstance().removeDataProvider(experiment, derivedOutputId);
             return Response.ok(derivedDescriptor).build();
         } catch (TmfConfigurationException e) {
             return Response.status(Status.BAD_REQUEST).entity(e.getMessage()).build();