this.startTime = startTime;
            this.topDirectory = topDirectory;
            this.rootDirectory = rootDirectory;
        }

        public Builder withUserProperties(@Nonnull Map<String, String> userProperties) {
            this.userProperties = new HashMap<>(userProperties);
            return this;
        }

                .lookup(PropertyContributorsHolder.class)
                .getPropertyContributors()
                .values()) {
            protoSession = protoSession.toBuilder()
                    .withUserProperties(propertyContributor.contribute(protoSession))
                    .build();
        }
        context.protoSession = protoSession;
    }

    protected void lookup(C context) throws Exception {