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Epic Link:
Multi-threaded solving
Affects Build:
CR1
Fix Build:
CR2
Target Release:

7.1.0.GA
Steps to Reproduce:

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git clone https://github.com/kiegroup/kie-benchmarks
cd kie-benchmarks/optaplanner-benchmarks
mvn clean install
java -jar optaplanner-perf-benchmark/target/optaplanner-benchmarks.jar VRPTWTabuSearchBenchmark

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git clone https://github.com/kiegroup/kie-benchmarks cd kie-benchmarks/optaplanner-benchmarks mvn clean install java -jar optaplanner-perf-benchmark/target/optaplanner-benchmarks.jar VRPTWTabuSearchBenchmark

TabuSearch using entity tabu throws NPE when solver is configured to use TailChainSwapMove. This regression has been likely introduced by:
https://github.com/kiegroup/optaplanner/commit/5b48250104436a485c2495a3edc3f79a8c333fe7

The issue has been revealed by performance benchmarks (see steps to reproduce).