GraphTxn can incorrectly attempt to create a nested transaction on find() calls

[rvesse]

Version

4.10.0

What happened?

A GraphTxn.find() call will fail if the GraphTxn is already in a transaction, PR #1964 made changes to address #1961 which attempted to make GraphTxn.find() behaviour transactionally consistent and thread-safe.

However the check at https://github.com/apache/jena/blob/jena-4.10.0/jena-arq/src/main/java/org/apache/jena/sparql/graph/GraphTxn.java#L118 was not inverted as it should be, so rather than only creating a transaction when one did not exist it instead did the opposite. This has already been fixed on main - https://github.com/apache/jena/blob/main/jena-arq/src/main/java/org/apache/jena/sparql/graph/GraphTxn.java#L118

Ideally a fix needs to be back ported to jena4 branch and a point release created to address this as otherwise GraphTxn.find() is broken for 4.10.0

Relevant output and stacktrace

No response

Are you interested in making a pull request?

None