JVM 메모리 누수 시뮬레이션

<dependency>
            <groupId>asm</groupId>
            <artifactId>asm</artifactId>
            <version>3.3.1</version>
</dependency>

package com.example.demo.test;
import java.util.ArrayList;
import java.util.List;

import org.objectweb.asm.ClassWriter;
import org.objectweb.asm.MethodVisitor;
import org.objectweb.asm.Opcodes;

public class MetaSpace extends ClassLoader {

    public static List<Class<?>> createClasses() {
        //  
        List<Class<?>> classes = new ArrayList<Class<?>>();
        //  1000w 1000w 。
        for (int i = 0; i < 10000000; ++i) {
            ClassWriter cw = new ClassWriter(0);
            //  Class{i}， public， java.lang.Object， 
            cw.visit(Opcodes.V1_1, Opcodes.ACC_PUBLIC, "Class" + i, null,
                    "java/lang/Object", null);
            //   
            MethodVisitor mw = cw.visitMethod(Opcodes.ACC_PUBLIC, "",
                    "()V", null, null);
            //  this
            mw.visitVarInsn(Opcodes.ALOAD, 0);
            //  Object 
            mw.visitMethodInsn(Opcodes.INVOKESPECIAL, "java/lang/Object",
                    "", "()V");
            //  return
            mw.visitInsn(Opcodes.RETURN);
            mw.visitMaxs(1, 1);
            mw.visitEnd();
            MetaSpace test = new MetaSpace();
            byte[] code = cw.toByteArray();
            //  
            Class<?> exampleClass = test.defineClass("Class" + i, code, 0, code.length);
            classes.add(exampleClass);
        }
        return classes;
    }
}

package com.example.demo.test;

import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

import java.util.ArrayList;
import java.util.List;
import java.util.UUID;

@RestController
public class TestController {

    private List<User> userList = new ArrayList<>();
    private List<Class<?>> classList = new ArrayList<Class<?>>();

    /**
     *   -Xms32M -Xmx32M
     * Exception in thread "http-nio-8080-exec-1" java.lang.OutOfMemoryError: GC overhead limit exceeded
     */
    @GetMapping("/heap")
    public void heap(){
        int i = 0;
        while (true){
            userList.add(new User(i++, UUID.randomUUID().toString()));
        }
    }

    /**
     *   -XX:MetaspaceSize=32M -XX:MaxMetaspaceSize=32M
     * Exception in thread "http-nio-8080-exec-1" java.lang.OutOfMemoryError: Metaspace
     */
    @GetMapping("/nonHeap")
    public void nonHeap(){
        int i = 0;
        while (true){
            classList.addAll(MetaSpace.createClasses());
        }
    }

}