JVM各种内存溢出是否产生dump

2016年05月10日 21:04:06

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

[java]view plain copy 
     
 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());  
         }  
     }  
 }  

java.lang.OutOfMemoryError: PermGen space
Dumping heap to java_pid8900.hprof ...
Heap dump file created [17009938 bytes in 0.336 secs]
Exception in thread "main" java.lang.OutOfMemoryError: PermGen space
at java.lang.String.intern(Native Method)
at PermPoolOOM.main(PermPoolOOM.java:8)

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

[java]view plain copy 
     
 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 {  
   
     }  
 }  

java.lang.OutOfMemoryError: PermGen space
Dumping heap to java_pid11000.hprof ...
Heap dump file created [6752989 bytes in 0.075 secs]
Exception in thread "main" net.sf.cglib.core.CodeGenerationException: java.lang.reflect.InvocationTargetException-->null
at net.sf.cglib.core.AbstractClassGenerator.create(AbstractClassGenerator.java:208)
at net.sf.cglib.proxy.Enhancer.createHelper(Enhancer.java:406)
at net.sf.cglib.proxy.Enhancer.create(Enhancer.java:318)
at JavaMethodAreaOOM.main(JavaMethodAreaOOM.java:21)
Caused by: java.lang.reflect.InvocationTargetException
at sun.reflect.GeneratedMethodAccessor1.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at net.sf.cglib.core.ReflectUtils.defineClass(ReflectUtils.java:411)
at net.sf.cglib.core.AbstractClassGenerator.create(AbstractClassGenerator.java:195)
... 3 more
Caused by: java.lang.OutOfMemoryError: PermGen space
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClassCond(Unknown Source)
at java.lang.ClassLoader.defineClass(Unknown Source)
... 8 more

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

[java]view plain copy 
     
 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);  
         }  
     }  
 }  

Exception in thread "main" java.lang.OutOfMemoryError
at sun.misc.Unsafe.allocateMemory(Native Method)
at com.comtop.DirectMemoryOOM.main(DirectMemoryOOM.java:15)

栈内存溢出，没有dump文件。JVM参数设置:-Xss128k

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[java]view plain copy 
     
 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)