JVM内存溢出与排错

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1、JVM内存溢出与排错一、JVM堆内存溢出Java堆用于存储对象实例，我们只要不断创建对象，并且保证GCRoots到对象之间有可达路径来避免垃圾回收机制来清除这些对象，就会在对象数量达到最大队的容量限制后产生内存溢出异常。代码：[java]viewplaincopyprint?1./**2.*Java堆内存溢出3.*@authorjiangtong4.*5.*/6.publicclassHeapOOM{7.staticclassOOMObject{8.9.}10./**11.*-Xms20M-Xmx20M-Xmn10M-XX:SurvivorRatio=8-

2、XX:PermSize=32M-XX:MaxPermSize=64M-XX:+PrintGCDetails-XX:+HeapDumpOnOutOfMemoryError12.*/13.publicstaticvoidmain(String[]args){14.Listlist=newArrayList();15.intcount=0;16.while(true){17.try{18.count++;19.list.add(newOOMObject());20.System.out.println("共构造了"+c

3、ount+"个对象");21.Thread.sleep(100);22.}catch(Exceptione){23.e.printStackTrace();24.}25.}1.}2.}/***Java堆内存溢出*@authorjiangtong**/publicclassHeapOOM{staticclassOOMObject{}/***-Xms20M-Xmx20M-Xmn10M-XX:SurvivorRatio=8-XX:PermSize=32M-XX:MaxPermSize=64M-XX:+PrintGCDetails-XX:+HeapDumpOnOu

4、tOfMemoryError*/publicstaticvoidmain(String[]args){Listlist=newArrayList();intcount=0;while(true){try{count++;list.add(newOOMObject());System.out.println("共构造了"+count+"个对象");Thread.sleep(100);}catch(Exceptione){e.printStackTrace();}}}}虚拟机执行参数说明：Xms20M-Xmx20M：

5、最小堆内存和最大堆内存设置为一样是为了避免堆内存的自动扩展-Xmn10M：新生代内存分配10M，剩余的交给老年代-XX:SurvivorRatio=8：新生代中Eden区和Survivor区的内存比例为8:1-XX:PermSize=32M：永久代最小内存32M-XX:MaxPermSize=64M：永久代最大扩展内存64M-XX:+HeapDumpOnOutOfMemoryError：堆内存溢出时Dump出当前的内存堆转储快照以便事后分析1、控制台输出分析：[GC[DefNew:8192K->1024K(9216K),0.0426563secs]8192

6、K->4599K(19456K),0.0427200secs][GC[DefNew:6237K->1024K(9216K),0.0552875secs]9813K->9742K(19456K),0.0553528secs][GC[DefNew:7581K->7581K(9216K),0.0000467secs][Tenured:8718K->10240K(10240K),0.1228164secs]16299K->11923K(19456K),[Perm:2086K->2086K(32768K)],0.1229961secs][FullGC[Tenured

7、:10240K->7996K(10240K),0.1247832secs]19456K->15528K(19456K),[Perm:2086K->2086K(32768K)],0.1248966secs][FullGC[Tenured:8598K->8598K(10240K),0.1296810secs]17814K->17814K(19456K),[Perm:2086K->2086K(32768K)],0.1297631secs][FullGC[Tenured:8598K->8595K(10240K),0.1481811secs]17814K->1781

8、1K(19456K),[Perm:2086K->2084K(327