JVM 内存区域内存溢出

Posted 2020-12-13 dreamtaker

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内存溢出以及堆栈溢出

简单认识一下2种内存异常OutOfMemoryError，StackOverflowError

来自JDK Doc的解释：

public class OutOfMemoryError extends VirtualMachineError

Thrown when the Java Virtual Machine cannot allocate an object because it is out of memory, and no more memory could be made available by the garbage collector. OutOfMemoryError objects may be constructed by the virtual machine as if suppression were disabled and/or the stack trace was not writable.

当JVM无法给对象分配足够的内存，并且GC收集器中也没有满足分配的内存空间时，抛出OOM异常。

public class StackOverflowError extends VirtualMachineError

Thrown when a stack overflow occurs because an application recurses too deeply.

当应用递归调用太深导致堆栈溢出时抛出SOF异常。

总结

1 线程请求的栈深度大于JVM允许的最大深度，抛出SOF异常

2 如果JVM的栈内存允许动态扩展，当栈扩展时无法申请到足够的内存，就抛出OOM异常。

环境

JDK 1.8 Win10x64

JAVA堆溢出

1.因为对象都是分配在JAVA堆上，所以以下代码操作触发堆溢出，配置

 -Xms20m -Xmx20m -XX:+HeapDumpOnOutOfMemoryError

 1 /**
 2  * VM Args： -Xms20m -Xmx20m -XX:+HeapDumpOnOutOfMemoryError
 3  * @author cxz
 4  * @Title:
 5  * @Package
 6  * @Description:
 7  * @date 2020/6/2811:03
 8  */
 9 public class HeapOOM {
10     static class OOMObject{
11     }
12     public static void main(String[] args) {
13         List<OOMObject> list = new ArrayList<OOMObject>();
14         while (true){
15             list.add(new OOMObject());
16         }
17     }
18 }