Use the latest JMH

This upgrades JMH to the latest available version. It required a
small code change to match the new API. This update primarily exists
because the old version of JMH placed @generated annotations in the
generated code, and these no longer exist on JDK 9.

Affects jgrapht#448

jgrapht-core/src/test/java/org/jgrapht/perf/graph/GraphPerformanceTest.java

@@ -56,8 +56,6 @@ public class GraphPerformanceTest
     @State(Scope.Benchmark)
     private static abstract class DirectedGraphBenchmarkBase
     {
-
-        private Blackhole blackhole;
         protected GnmRandomGraphGenerator<Integer, DefaultWeightedEdge> rgg;
         private SimpleDirectedWeightedGraph<Integer, DefaultWeightedEdge> graph;
 
@@ -71,7 +69,7 @@ private static abstract class DirectedGraphBenchmarkBase
         @Setup
         public void setup()
         {
-            blackhole = new Blackhole();
+
         }
 
         /**
@@ -94,7 +92,7 @@ public void generateGraphBenchmark()
          * destroy graph
          */
         @Benchmark
-        public void graphPerformanceBenchmark()
+        public void graphPerformanceBenchmark(Blackhole blackhole)
         {
             for (int i = 0; i < NR_GRAPHS; i++) {
                 rgg = new GnmRandomGraphGenerator<>(

pom.xml

@@ -85,12 +85,12 @@
 			<dependency>
 				<groupId>org.openjdk.jmh</groupId>
 				<artifactId>jmh-core</artifactId>
-				<version>1.10.3</version>
+				<version>1.20</version>
 			</dependency>
 			<dependency>
 				<groupId>org.openjdk.jmh</groupId>
 				<artifactId>jmh-generator-annprocess</artifactId>
-				<version>1.10.3</version>
+				<version>1.20</version>
 			</dependency>
 			<dependency>
 				<groupId>org.tinyjee.jgraphx</groupId>