jvm virtual machine (a): jvm memory overflow problem analysis and solution

  Learn about the java virtual machine, one of the

added operating parameters
-XX: + HeapDumpOnOutOfMemoryError -Xms30m -Xmx30m

-XX: + HeapDumpOnOutOfMemoryError this parameter will generate a stack snapshot for locating abnormal

Simulation scenario memory overflow, simple code:

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package top.alertcode.demo.jvm; import java.util.ArrayList; * @author alertcode * @date 2018-04-03 * @copyright alertcode.top */ public class { * This code eventually run out of memory exception occurs * @param args * / public static void main (String [] args) { the ArrayList <OutOfMemoryDemo> List = new new the ArrayList <OutOfMemoryDemo> (); the while ( to true ) { List. the Add ( new new OutOfMemoryDemo ()); } } the following error occurs // / * the target Connected to the VM, address: '127.0.0.1:53483', Transport: 'Socket' Exception in Thread "main" a java.lang.OutOfMemoryError : the Java heap Space AT java.util.Arrays.copyOf (Arrays.java:3210) AT java.util.Arrays.copyOf (Arrays.java:3181) at java.util.ArrayList.grow(ArrayList.java:265) at java.util.ArrayList.ensureExplicitCapacity(ArrayList.java:239) at java.util.ArrayList.ensureCapacityInternal(ArrayList.java:231) at java.util.ArrayList.add(ArrayList.java:462) at top.alertcode.demo.jvm.OutOfMemoryDemo.main(OutOfMemoryDemo.java:15) Disconnected from the target VM, address: '127.0.0.1:53483', transport: 'socket'*/ }

  Use analysis tools MAT (Eclipse Memory Analyzer), were analyzed, it is easy to locate the cause of memory leaks that frequently create objects. Referring next to FIG:

Original: Big Box  jvm virtual machine (a): analysis and problem solving jvm memory overflow