JAVA常见内存溢出模拟

1、堆溢出

import java.util.ArrayList;
import java.util.List;
/**
* 堆溢出
* -Xms20m -Xmx20m -XX:+HeapDumpOnOutOfMemoryError
* java.lang.OutOfMemoryError: Java heap space
* Created by double on 2019/8/31.
*/
public class HeapOOM {
public static void main(String[] args) {
List list = new ArrayList();
while (true) {
list.add(new Object());
}
}
}

2、虚拟机栈溢出

/**
* 虚拟机栈溢出
* -Xss128k
* java.lang.StackOverflowError
* Created by double on 2019/8/31.
*/
public class JavaVMStackSOF {
private int stackLength = 1;
public void stackLeak() {
stackLength++;
stackLeak();
}
public static void main(String[] args) throws Throwable {
JavaVMStackSOF javaVMStackSOF = new JavaVMStackSOF();
try {
javaVMStackSOF.stackLeak();
} catch (Throwable e) {
System.out.println("stack length: " + javaVMStackSOF.stackLength);
throw e;
}
}
}

3、方法区溢出

import net.sf.cglib.proxy.Enhancer;
import net.sf.cglib.proxy.MethodInterceptor;
import net.sf.cglib.proxy.MethodProxy;
import java.lang.reflect.Method;
/**
* VM Args（jdk1.8）: -XX:MetaspaceSize=30M -XX:MaxMetaspaceSize=30M
* Exception（jdk1.8）: java.lang.OutOfMemoryError: Metaspace
* 方法区溢出（动态Class太多）
* Created by double on 2019/8/31.
*/
public class JavaMethodAreaOOM {
public static void main(String[] args) {
while (true) {
Enhancer enhancer = new Enhancer();
enhancer.setSuperclass(OOMObcect.class);
enhancer.setUseCache(false);
enhancer.setCallback(new MethodInterceptor() {
@Override
public Object intercept(Object obj, Method method, Object[] args, MethodProxy proxy) throws Throwable {
return proxy.invokeSuper(obj, args);
}
});
enhancer.create();
}
}
static class OOMObcect {
}
}

4、方法区中运行时常量池溢出

import java.util.ArrayList;
import java.util.List;
import java.util.UUID;
/**
* 方法区中运行时常量池溢出
* VM Args（jdk1.6）: -XX:PermSize=10M -XX:MaxPermSize=10M
* VM Args（jdk1.7）: -Xms30m -Xmx30m -XX:+HeapDumpOnOutOfMemoryError
* Exception（jdk1.6） : java.lang.OutOfMemoryError: PermGen space
* Exception（jdk1.7）: java.lang.OutOfMemoryError: Java heap space
* Created by double on 2019/8/31.
*/
public class RuntimeConstantPoolOOM {
public static void main(String[] args) {
//使用List保持着常量池引用，避免Full GC回收常量池行为
List list = new ArrayList();
while (true) {
list.add(UUID.randomUUID().toString().intern());
}
}
}

5、本机直接内存溢出

import sun.misc.Unsafe;
import java.lang.reflect.Field;
/**
* 本机直接内存溢出
* VM Args: -Xmx20M -XX:MaxDirectMemorySize=10M
* java.lang.OutOfMemoryError
* sun.misc.Unsafe.allocateMemory(Native Method)
* Created by double on 2019/8/31.
*/
public class DirectMemoryOOM {
private static final int _1MB = 1024 * 1024;
public static void main(String[] args) throws IllegalAccessException {
Field unsafeField = Unsafe.class.getDeclaredFields()[0];
unsafeField.setAccessible(true);
Unsafe unsafe = (Unsafe) unsafeField.get(null);
while (true) {
unsafe.allocateMemory(_1MB);
}
}
}

 原文来自：https://www.cnblogs.com/rerise/p/16202418.html