RDF4J SPARQL query "Handler dispatch failed; nested exception is java.lang.StackOverflowError"

[edmondchuc]

For large resources with many relationships and properties, fetching the data may result in the following error:

Handler dispatch failed; nested exception is java.lang.StackOverflowError

Related issues on the web:

• https://stackoverflow.com/questions/69075463/graphdb-post-sparql-file-error-handler-dispatch-failed-nested-exception-is-jav
• https://github.com/eclipse/rdf4j/issues/3328

[edmondchuc]

This occurs when performing large queries for resource labels.

Solution: break the query into smaller chunks to avoid the java.lang.StackOverFlowError error. Cache the values using Flask-Caching, which is set up ready to use in tern_flask.

Nice to have: with caching, use stale-while-evaluate strategy for fast experience for users.

[edmondchuc]

This may have been fixed in the following PRs

• https://github.com/ternaustralia/linkeddata-api/pull/42
• https://github.com/ternaustralia/linkeddata-api/pull/43
• https://github.com/ternaustralia/linkeddata-api/pull/45
• https://github.com/ternaustralia/linkeddata-api/pull/47

[edmondchuc]

This should likely no longer occur with the introduction of paginated property values on resources in the v2 API https://github.com/ternaustralia/linkeddata-api/pull/51