Add JMH benchmarks

Closes gh-24104

spring-beans/src/jmh/java/org/springframework/beans/BeanUtilsBenchmark.java

@@ -0,0 +1,66 @@
+/*
+ * Copyright 2002-2022 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.beans;
+
+import java.lang.reflect.Constructor;
+import java.util.concurrent.TimeUnit;
+
+import org.openjdk.jmh.annotations.Benchmark;
+import org.openjdk.jmh.annotations.BenchmarkMode;
+import org.openjdk.jmh.annotations.Mode;
+import org.openjdk.jmh.annotations.OutputTimeUnit;
+import org.openjdk.jmh.annotations.Scope;
+import org.openjdk.jmh.annotations.Setup;
+import org.openjdk.jmh.annotations.State;
+
+@State(Scope.Thread)
+@BenchmarkMode(Mode.AverageTime)
+@OutputTimeUnit(TimeUnit.NANOSECONDS)
+public class BeanUtilsBenchmark {
+
+	private Constructor<TestClass1> noArgConstructor;
+	private Constructor<TestClass2> constructor;
+
+	@Setup
+	public void setUp() throws NoSuchMethodException {
+		this.noArgConstructor = TestClass1.class.getDeclaredConstructor();
+		this.constructor = TestClass2.class.getDeclaredConstructor(int.class, String.class);
+	}
+
+	@Benchmark
+	public Object emptyConstructor() {
+		return BeanUtils.instantiateClass(this.noArgConstructor);
+	}
+
+	@Benchmark
+	public Object nonEmptyConstructor() {
+		return BeanUtils.instantiateClass(this.constructor, 1, "str");
+	}
+
+	static class TestClass1{
+	};
+
+	static class TestClass2 {
+		private final int value1;
+		private final String value2;
+
+		TestClass2(int value1, String value2) {
+			this.value1 = value1;
+			this.value2 = value2;
+		}
+	}
+}

spring-beans/src/jmh/kotlin/org/springframework/beans/KotlinBeanUtilsBenchmark.kt

@@ -0,0 +1,51 @@
+/*
+ * Copyright 2002-2022 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.beans
+
+import java.util.concurrent.TimeUnit;
+
+import org.openjdk.jmh.annotations.Benchmark
+import org.openjdk.jmh.annotations.BenchmarkMode
+import org.openjdk.jmh.annotations.Mode
+import org.openjdk.jmh.annotations.OutputTimeUnit
+import org.openjdk.jmh.annotations.Scope
+import org.openjdk.jmh.annotations.State
+
+@State(Scope.Thread)
+@BenchmarkMode(Mode.AverageTime)
+@OutputTimeUnit(TimeUnit.NANOSECONDS)
+open class KotlinBeanUtilsBenchmark {
+
+		private val noArgConstructor = TestClass1::class.java.getDeclaredConstructor()
+		private val constructor = TestClass2::class.java.getDeclaredConstructor(Int::class.java, String::class.java)
+
+		@Benchmark
+		fun emptyConstructor(): Any {
+		return BeanUtils.instantiateClass(noArgConstructor)
+		}
+
+		@Benchmark
+		fun nonEmptyConstructor(): Any {
+		return BeanUtils.instantiateClass(constructor, 1, "str")
+		}
+
+		class TestClass1()
+
+		@Suppress("UNUSED_PARAMETER")
+		class TestClass2(int: Int, string: String)
+}
+