diff --git a/producer/spark_dataproc/runner/get_openlineage_jar.sh b/producer/spark_dataproc/runner/get_openlineage_jar.sh
index bf418457..23adfacf 100755
--- a/producer/spark_dataproc/runner/get_openlineage_jar.sh
+++ b/producer/spark_dataproc/runner/get_openlineage_jar.sh
@@ -5,23 +5,19 @@
 set -euxo pipefail
 
 readonly VM_SPARK_JARS_DIR=/usr/lib/spark/jars
-readonly SPARK_BQ_CONNECTOR_URL=$(/usr/share/google/get_metadata_value attributes/SPARK_BQ_CONNECTOR_URL || echo "")
-readonly OPENLINEAGE_SPARK_URL=$(/usr/share/google/get_metadata_value attributes/OPENLINEAGE_SPARK_URL || echo "")
-readonly SPARK_SPANNER_CONNECTOR_URL=$(/usr/share/google/get_metadata_value attributes/SPARK_SPANNER_CONNECTOR_URL || echo "")
-readonly SPARK_BIGTABLE_CONNECTOR_URL=$(/usr/share/google/get_metadata_value attributes/SPARK_BIGTABLE_CONNECTOR_URL || echo "")
 readonly SKIP_ICEBERG_AND_DELTA=$(/usr/share/google/get_metadata_value attributes/SKIP_ICEBERG_AND_DELTA || echo "")
 
-if [[ -n "${OPENLINEAGE_SPARK_URL}" ]]; then
-    bq_url="${SPARK_BQ_CONNECTOR_URL}"
-    ol_url="${OPENLINEAGE_SPARK_URL}"
-    spanner_url="${SPARK_SPANNER_CONNECTOR_URL}"
-    bigtable_url="${SPARK_BIGTABLE_CONNECTOR_URL}"
-else
-    bq_url="gs://open-lineage-e2e/jars/spark-3.5-bigquery-0.42.4.jar"
-    ol_url="gs://open-lineage-e2e/jars/openlineage-spark_2.12-1.29.0-SNAPSHOT.jar"
-    spanner_url="gs://open-lineage-e2e/jars/spark-3.1-spanner-1.1.0.jar"
-    bigtable_url="gs://open-lineage-e2e/jars/spark-bigtable_2.12-0.3.0.jar"
-fi
+# Returns the metadata attribute value, or the given default when the attribute is not set.
+metadata_or_default() {
+  local value
+  value=$(/usr/share/google/get_metadata_value "attributes/$1" || echo "")
+  echo "${value:-$2}"
+}
+
+bq_url=$(metadata_or_default SPARK_BQ_CONNECTOR_URL "gs://open-lineage-e2e/jars/spark-3.5-bigquery-0.42.4.jar")
+ol_url=$(metadata_or_default OPENLINEAGE_SPARK_URL "gs://open-lineage-e2e/jars/openlineage-spark_2.12-1.29.0-SNAPSHOT.jar")
+spanner_url=$(metadata_or_default SPARK_SPANNER_CONNECTOR_URL "gs://open-lineage-e2e/jars/spark-3.1-spanner-1.1.0.jar")
+bigtable_url=$(metadata_or_default SPARK_BIGTABLE_CONNECTOR_URL "gs://open-lineage-e2e/jars/spark-bigtable_2.12-0.3.0.jar")
 
 postgresql_url="gs://open-lineage-e2e/jars/postgresql-42.5.6.jar"
 delta_spark_url="gs://open-lineage-e2e/jars/delta-spark_2.12-3.3.1.jar"