webapp/src/main/java/domainapp/webapp/custom/restapi/CustomController.java [32:43]:
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    List<SimpleObject> all() {
        return call("sven", simpleObjects::listAll)
                .orElse(Collections.<SimpleObject>emptyList());
    }

    private <T> Optional<T> call(
            final String username,
            final Callable<T> callable) {

        return interactionService.call(
                InteractionContext.ofUserWithSystemDefaults(UserMemento.ofName(username)),
                () -> transactionalProcessor.callWithinCurrentTransactionElseCreateNew(callable))
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webapp/src/main/java/domainapp/webapp/quartz/job/SampleJob.java [42:53]:
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    List<SimpleObject> all() {
        return call("sven", simpleObjects::listAll)
                .orElse(Collections.<SimpleObject>emptyList());
    }

    private <T> Optional<T> call(
            final String username,
            final Callable<T> callable) {

        return interactionService.call(
                InteractionContext.ofUserWithSystemDefaults(UserMemento.ofName(username)),
                () -> transactionalProcessor.callWithinCurrentTransactionElseCreateNew(callable))
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