标签:lang java class public 内存 import JAVA 溢出
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<Object> list = new ArrayList<Object>(); 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<String> list = new ArrayList<String>(); 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
标签:lang,java,class,public,内存,import,JAVA,溢出 来源: https://www.cnblogs.com/rerise/p/16202418.html
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