# Connecting AWS Neptune data to Athena using Federated Query functionality via the Athena Neptune Connector without using Glue

**URL:** <https://community.amazonquick.com/t/connecting-aws-neptune-data-to-athena-using-federated-query-functionality-via-the-athena-neptune-connector-without-using-glue/49140>\
**Category:** Q&A\
**Tags:** error, developer, quick-sight\
**Created:** [August 12, 2025, 7:04pm UTC](https://community.amazonquick.com/t/connecting-aws-neptune-data-to-athena-using-federated-query-functionality-via-the-athena-neptune-connector-without-using-glue/49140 "2025-08-12T19:04:34Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![isaivas](https://avatars.discourse-cdn.com/v4/letter/i/e9bcb4/32.png) [@isaivas](https://community.amazonquick.com/u/isaivas)\
**Post date:** [August 12, 2025, 7:04pm UTC](https://community.amazonquick.com/t/connecting-aws-neptune-data-to-athena-using-federated-query-functionality-via-the-athena-neptune-connector-without-using-glue/49140/1 "2025-08-12T19:04:34Z")

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What does this error code mean: **GENERIC\_INTERNAL\_ERROR: Cannot invoke “String.toLowerCase(java.util.Locale)” because “schema” is null This query ran against the “neptune\_temp\_db” database, unless qualified by the query.**

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**Author:** ![Brett](https://d2orw1595917va.cloudfront.net/user_avatar/community.amazonquick.com/brett/32/36494_2.png) [@Brett](https://community.amazonquick.com/u/Brett)\
**Post date:** [August 15, 2025, 1:06pm UTC](https://community.amazonquick.com/t/connecting-aws-neptune-data-to-athena-using-federated-query-functionality-via-the-athena-neptune-connector-without-using-glue/49140/2 "2025-08-15T13:06:04Z")

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Hi @isaivas and welcome to the Quick Sight community.  
To my understanding, this error code is the result of your connector between Neptune and Athena encountering missing or undefined schema; potentially encountering an unexpected null in schema handling logic.

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**Author:** ![isaivas](https://avatars.discourse-cdn.com/v4/letter/i/e9bcb4/32.png) [@isaivas](https://community.amazonquick.com/u/isaivas)\
**Post date:** [August 15, 2025, 8:04pm UTC](https://community.amazonquick.com/t/connecting-aws-neptune-data-to-athena-using-federated-query-functionality-via-the-athena-neptune-connector-without-using-glue/49140/3 "2025-08-15T20:04:41Z")

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Thank you Brett, this makes sense. This blog is outdated: [Build interactive graph data analytics and visualizations using Amazon Neptune, Amazon Athena Federated Query, and Amazon QuickSight | AWS Database Blog](https://aws.amazon.com/blogs/database/build-interactive-graph-data-analytics-and-visualizations-using-amazon-neptune-amazon-athena-federated-query-and-amazon-quicksight/)

The user was attempting to recreate this without Glue, but today the Neptune connector does require Glue Data Catalogs.

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<div class="post-metadata">

**Author:** ![Brett](https://d2orw1595917va.cloudfront.net/user_avatar/community.amazonquick.com/brett/32/36494_2.png) [@Brett](https://community.amazonquick.com/u/Brett)\
**Post date:** [August 19, 2025, 3:51pm UTC](https://community.amazonquick.com/t/connecting-aws-neptune-data-to-athena-using-federated-query-functionality-via-the-athena-neptune-connector-without-using-glue/49140/4 "2025-08-19T15:51:47Z")

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Hi @isaivas,  
Thank you for the information regarding the blog, I’ll submit to the support team so that the blog can be considered for adjustment.