JVM各种内存溢出是否产生dump

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     对于java的内存溢出，如果配置-XX:+HeapDumpOnOutOfMemoryError，很明确的知道堆内存溢出时会生成dump文件。但永久代内存溢出不明确是否会生成，今天来做一个实验：

永久代内存溢出，有dump文件。JVM的参数是-XX:PermSize=10m  -XX:MaxPermSize=10m   -XX:+HeapDumpOnOutOfMemoryError

import java.util.ArrayList;
import java.util.List;
public class PermPoolOOM{
    public static void main(String[] args){
        List  list = new ArrayList();
        int i = 0;
        while(true){
          list.add(String.valueOf(i++).intern());
        }
    }
}

方法区溢出，有dump文件。需要下载cglib-full-2.0.1.jar，JVM参数设置：-XX:PermSize=10m  -XX:MaxPermSize=10m   -XX:+HeapDumpOnOutOfMemoryError

import java.lang.reflect.Method;
import net.sf.cglib.proxy.Enhancer;
import net.sf.cglib.proxy.MethodInterceptor;
import net.sf.cglib.proxy.MethodProxy;

public class JavaMethodAreaOOM {

    public static void main(String[] args) {
           while (true) {
                  Enhancer enhancer = new Enhancer();
                  enhancer.setSuperclass(OOMObject.class);
                  enhancer.setUseCache(false);
                  enhancer.setCallback(new MethodInterceptor() {
                         public Object intercept(Object obj, Method method, Object[] args, MethodProxy proxy) throws Throwable {
                                return proxy.invokeSuper(obj, args);
                         }
                  });
                  enhancer.create();
           }
    }
    static class OOMObject {

    }
}

直接内存溢出，没有dump文件。JVM参数配置：-XX:PermSize=10m  -XX:MaxPermSize=10m   -XX:+HeapDumpOnOutOfMemoryError  -XX:MaxDirectMemorySize=10M

import java.lang.reflect.Field;
import sun.misc.Unsafe;

public class DirectMemoryOOM{
    private static final int _1MB = 1024* 1024 * 1024;
    public static void main(String[] args) throws Exception{
        Field unsafeField = Unsafe.class.getDeclaredFields()[0];
        unsafeField.setAccessible(true);
        Unsafe unsafe = (Unsafe) unsafeField.get(null);
        while(true){
            //unsafe直接想操作系统申请内存
            unsafe.allocateMemory(_1MB);
        }
    }
}

栈内存溢出，没有dump文件。JVM参数设置:-Xss128k

public class JavaVMStackOF{
    int stackLength = 1;
    public void stackLeak(){
        stackLength++;
        stackLeak();
}
public static void main(String[] args){
    JavaVMStackOF oom = new JavaVMStackOF();
    oom.stackLeak();
}
}

Exception in thread "main" java.lang.StackOverflowError
at JavaVMStackOF.stackLeak(JavaVMStackOF.java:6)
at JavaVMStackOF.stackLeak(JavaVMStackOF.java:7)
at JavaVMStackOF.stackLeak(JavaVMStackOF.java:7)
at JavaVMStackOF.stackLeak(JavaVMStackOF.java:7)
at JavaVMStackOF.stackLeak(JavaVMStackOF.java:7)
at JavaVMStackOF.stackLeak(JavaVMStackOF.java:7)
at JavaVMStackOF.stackLeak(JavaVMStackOF.java:7)
at JavaVMStackOF.stackLeak(JavaVMStackOF.java:7)
at JavaVMStackOF.stackLeak(JavaVMStackOF.java:7)
at JavaVMStackOF.stackLeak(JavaVMStackOF.java:7)
at JavaVMStackOF.stackLeak(JavaVMStackOF.java:7)
at JavaVMStackOF.stackLeak(JavaVMStackOF.java:7)
at JavaVMStackOF.stackLeak(JavaVMStackOF.java:7)
at JavaVMStackOF.stackLeak(JavaVMStackOF.java:7)
at JavaVMStackOF.stackLeak(JavaVMStackOF.java:7)
at JavaVMStackOF.stackLeak(JavaVMStackOF.java:7)
at JavaVMStackOF.stackLeak(JavaVMStackOF.java:7)
at JavaVMStackOF.stackLeak(JavaVMStackOF.java:7)
at JavaVMStackOF.stackLeak(JavaVMStackOF.java:7)
at JavaVMStackOF.stackLeak(JavaVMStackOF.java:7)
at JavaVMStackOF.stackLeak(JavaVMStackOF.java:7)
at JavaVMStackOF.stackLeak(JavaVMStackOF.java:7)
at JavaVMStackOF.stackLeak(JavaVMStackOF.java:7)
at JavaVMStackOF.stackLeak(JavaVMStackOF.java:7)

JVM各种内存溢出是否产生dump

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原文地址：http://blog.csdn.net/stevendbaguo/article/details/51366181