我在Glassfish V2.1 6实例群集配置(SLES 10 SP4,64位Suse Linux机器,19Gb RAM)中运行大型企业应用程序,DAS机器server.log显示一些“java.lang.OutOfMemoryError:Java堆空间”错误。从DAS” jvm.log显示堆使用情况报告:Glassfish DAS OutOfMemory,总堆使用率低于最大堆大小
Heap
PSYoungGen total 103488K, used 99840K [0x00002aab237c0000, 0x00002aab2a270000, 0x00002aab4e260000)
eden space 99840K, 100% used [0x00002aab237c0000,0x00002aab29940000,0x00002aab29940000)
from space 3648K, 0% used [0x00002aab29940000,0x00002aab29940000,0x00002aab29cd0000)
to space 4672K, 0% used [0x00002aab29de0000,0x00002aab29de0000,0x00002aab2a270000)
PSOldGen total 1398144K, used 1398143K [0x00002aaace260000, 0x00002aab237c0000, 0x00002aab237c0000)
object space 1398144K, 99% used [0x00002aaace260000,0x00002aab237bfe70,0x00002aab237c0000)
PSPermGen total 107200K, used 106931K [0x00002aaaae260000, 0x00002aaab4b10000, 0x00002aaace260000)
object space 107200K, 99% used [0x00002aaaae260000,0x00002aaab4accd98,0x00002aaab4b10000)
从我们得到1.6GB的总堆空间上面(103488 + 1398144 + 107200 = 1608832〜1.6GB),即使允许的最大堆空间设置为2Gb(-XX:MaxPermSize = 512m -Xmx2048m)。那么我的问题是:为什么JVM在输出OOM错误之前不会增加堆大小?我们如何解释上面的堆报告?我在一个二进制文件堆MAT跑工具,并得到了2名泄漏嫌疑人:
Problem suspect #1
One instance of "com.sun.jmx.mbeanserver.JmxMBeanServer" loaded by "<system class loader>" occupies 522,351,680 (34.12%) bytes. The instance is referenced by org.jvnet.glassfish.comms.admin.management.extensions.config.OverloadProtectionServiceConfigImpl @ 0x2aaacfe74ed0 , loaded by "com.sun.appserv.server.util.ASURLClassLoader @ 0x2aaace7fc630". The memory is accumulated in one instance of "java.util.HashMap$Entry[]" loaded by "<system class loader>".
Keywords
java.util.HashMap$Entry[]
com.sun.appserv.server.util.ASURLClassLoader @ 0x2aaace7fc630
com.sun.jmx.mbeanserver.JmxMBeanServer
Problem suspect #2
140,421 instances of "net.jxta.impl.endpoint.tcp.TcpMessenger", loaded by "com.sun.appserv.server.util.ASURLClassLoader @ 0x2aaace7fc630" occupy 735,809,464 (48.07%) bytes. These instances are referenced from one instance of "java.util.TimerTask[]", loaded by "<system class loader>"
Keywords
java.util.TimerTask[]
com.sun.appserv.server.util.ASURLClassLoader @ 0x2aaace7fc630
net.jxta.impl.endpoint.tcp.TcpMessenger
不幸发生的错误在几个星期前,机器已重新启动,因为这样我可能已经失去了一些相关的背景信息。我正在寻找提示或解释,并尝试防止这些错误。预先感谢您的帮助。
欢呼
/萨姆
实际的OOM错误在哪里?它看起来更像是你用完堆而不是堆内存。 – Preston 2012-03-17 01:08:46