GH-2787: Deadlock in JenaSystem.init()
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- Restored the early return from `JenaSystem.init()` as implemented prior to [commit 8654c07](apache@8654c07). - Simplified initialization using the "Initialization-on-demand holder idiom" for better efficiency and thread safety. - Added integration tests for `JenaSystem.init()`, including tests for parallel execution cases. - Implemented additional integration tests that start with a fresh JVM for each run, using JMH as the test runner. - Added `org.openjdk.jmh` as a dependency in `jena-integration-tests`. - Added a regression test for apache#2675 as org.apache.jena.sys.TestJenaSystemWithFreshJVM.initRDFConnectionFuseki
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JenaSystem.init()as implemented prior to commit 8654c07.JenaSystem.init(), including tests for parallel execution cases.org.openjdk.jmhas a dependency injena-integration-tests.GitHub issue resolved #
Pull request Description:
By submitting this pull request, I acknowledge that I am making a contribution to the Apache Software Foundation under the terms and conditions of the Contributor's Agreement.
See the Apache Jena "Contributing" guide.