我有一个Java进程，现在使用1.2GB内存 我用jmap dump一个heap.bin，用内存分析器检查，内存只用了2.4MB 要找到哪个对象使用1.2GB内存？
详细 大小：2.4 MB类：1.2k对象：57.9k类加载器：66个无法到达的对象直方图
Class Name | Shallow Heap | Retained Heap | Percentage
class java.io.ObjectStreamClass$Caches @ 0xe1a3f9c0 System Class | 16 | 765,096 | 30.94%
sun.misc.Launcher$AppClassLoader @ 0xe55872d0 | 72 | 390,664 | 15.80%
org.jdom.Element @ 0xe55a4dc8 | 32 | 343,472 | 13.89%
class com.sun.org.apache.xerces.internal.util.XMLChar @ 0xe18fe228 System Class | 40 | 65,592 | 2.65%
sun.nio.cs.ext.ExtendedCharsets @ 0xe55acab0 | 32 | 64,800 | 2.62%
sun.misc.Launcher$ExtClassLoader @ 0xe55ab718 | 72 | 51,792 | 2.09%
sun.text.resources.LocaleElements @ 0xe5552a28 | 24 | 50,824 | 2.06%
class java.lang.System @ 0xe155feb0 System Class | 24 | 43,392 | 1.75%
class sun.nio.cs.ext.Big5$Decoder @ 0xe193aab8 System Class | 32 | 34,840 | 1.41%
class com.sun.org.apache.xerces.internal.util.EncodingMap @ 0xe1911970 System Class| 8 | 30,496 | 1.23%
sun.text.resources.DateFormatZoneData @ 0xe5552a10 | 24 | 25,368 | 1.03%
java.io.PrintStream @ 0xe5592940 | 32 | 25,088 | 1.01%
class java.beans.Introspector @ 0xe1766b10 System Class | 64 | 23,424 | 0.95%
class $Proxy1 @ 0xe1b28eb0 | 312 | 23,368 | 0.94%
java.lang.String[560][] @ 0xe55889c0 | 2,256 | 20,176 | 0.82%
class sun.security.jca.Providers @ 0xe1a52ed8 System Class | 24 | 16,240 | 0.66%
class java.nio.charset.Charset @ 0xe15d5b60 System Class | 40 | 12,184 | 0.49%
auo.beol.hisloader.BeolHisLoader @ 0xe55b5848 Thread-4 Thread | 160 | 12,064 | 0.49%
auo.beol.hisloader.RecoverHisLoader @ 0xe5651018 Thread-3 Thread | 160 | 11,976 | 0.48%
org.jdom.Element @ 0xe55b1520 | 32 | 11,776 | 0.48%
org.apache.log4j.RollingFileAppender @ 0xe55a3350 | 72 | 11,512 | 0.47%
org.apache.log4j.RollingFileAppender @ 0xe5587d20 | 72 | 11,472 | 0.46%
org.apache.log4j.ConsoleAppender @ 0xe5587e50 | 56 | 11,320 | 0.46%
class com.sun.org.apache.xerces.internal.impl.Constants @ 0xe1909fa8 System Class | 528 | 11,072 | 0.45%
org.apache.log4j.RollingFileAppender @ 0xe55a3590 | 72 | 11,000 | 0.44%
org.apache.log4j.RollingFileAppender @ 0xe559b220 | 72 | 10,968 | 0.44%
class $Proxy0 @ 0xe1aefcb0 | 160 | 10,672 | 0.43%
auo.cim.util.log.LogThreadData @ 0xe55a44b0 | 32 | 8,920 | 0.36%
auo.cim.util.log.LogThreadData @ 0xe5651130 | 32 | 8,920 | 0.36%
auo.cim.util.log.LogThreadData @ 0xebf5a038 | 32 | 8,920 | 0.36%
Total: 30 of 3,146 entries; 3,116 more |
答案 0 :(得分：0)
答案 1 :(得分：0)
必须有一个持有引用的对象，它可能导致内存泄漏。如果您有堆转储，则可以查看哪个类型具有最多的对象，并搜索包含对它们的引用的对象。然后你应该检查你的代码，并找到导致内存泄漏问题的行。
也许这个链接会有所帮助： http://www.javacodegeeks.com/2013/05/monitoring-and-detecting-memory-leaks-in-your-java-application.html
还有一个名为MAT的漂亮工具：http://www.eclipse.org/mat/
它帮助我解决了记忆问题。