GcPermgenTest

gistfile1.java

package ru.serce.gctest;

import java.lang.reflect.Method;

import javassist.ClassPool;
import javassist.CtClass;
import javassist.CtMethod;

public class GcPermgenTest {
    
    static {
        new OutOfMemoryError().printStackTrace();
    }
    
    public static void main(String[] args) throws InterruptedException {
        for(long i = 0;; i++) {
            genClass(i);
        }
    }
    
    private static Object genClass(long i) {
        try {
            ClassLoader loader = new ClassLoader() {
            };
            ClassPool pool = new ClassPool(null);
            pool.appendSystemPath();
            CtClass cc = pool.makeClass("Main" + i);
            CtMethod method = CtMethod.make(
                    "public static long doSome() {" + 
                            "return " + i + "L;" + 
                    "}", cc);
            cc.addMethod(method);
            Class<?> clazz = cc.toClass(loader);
            Method m = clazz.getMethod("doSome");
            return m.invoke(null, null);
        } catch (Throwable e) {
            e.printStackTrace();
            throw new RuntimeException(e);
        }
    }
}