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1# 发表于:2015-07-03 10:13:49 IP:202.122.*.*

在使用bbs时出现系统内存溢出的现象，重启后恢复正常
linux下top命令显示的CPU和内存情况
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
18993 test 20 0 2624m 552m 12m S 164.9 14.4 507:45.22 java

以下是tomcat报的异常
七月 03, 2015 9:57:44 上午 net.sf.ehcache.store.DiskStore throwableSafeFlushSpoolIfRequired
严重: org.hibernate.cache.StandardQueryCache Cache: Could not flush elements to disk due to PermGen space. Continuing...
java.lang.OutOfMemoryError: PermGen space
at sun.misc.Unsafe.defineClass(Native Method)
at sun.reflect.ClassDefiner.defineClass(ClassDefiner.java:63)
at sun.reflect.MethodAccessorGenerator$1.run(MethodAccessorGenerator.java:399)
at sun.reflect.MethodAccessorGenerator$1.run(MethodAccessorGenerator.java:396)
at java.security.AccessController.doPrivileged(Native Method)
at sun.reflect.MethodAccessorGenerator.generate(MethodAccessorGenerator.java:395)
at sun.reflect.MethodAccessorGenerator.generateSerializationConstructor(MethodAccessorGenerator.java:113)
at sun.reflect.ReflectionFactory.newConstructorForSerialization(ReflectionFactory.java:331)
at java.io.ObjectStreamClass.getSerializableConstructor(ObjectStreamClass.java:1376)
at java.io.ObjectStreamClass.access$1500(ObjectStreamClass.java:72)
at java.io.ObjectStreamClass$2.run(ObjectStreamClass.java:493)
at java.io.ObjectStreamClass$2.run(ObjectStreamClass.java:468)
at java.security.AccessController.doPrivileged(Native Method)
at java.io.ObjectStreamClass.<init>(ObjectStreamClass.java:468)
at java.io.ObjectStreamClass.lookup(ObjectStreamClass.java:365)
at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1133)
at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:347)
at net.sf.ehcache.util.MemoryEfficientByteArrayOutputStream.serialize(MemoryEfficientByteArrayOutputStream.java:75)
at net.sf.ehcache.store.DiskStore.serializeElement(DiskStore.java:783)
at net.sf.ehcache.store.DiskStore.writeElement(DiskStore.java:737)
at net.sf.ehcache.store.DiskStore.writeOrReplaceEntry(DiskStore.java:731)
at net.sf.ehcache.store.DiskStore.flushSpool(DiskStore.java:705)
at net.sf.ehcache.store.DiskStore.throwableSafeFlushSpoolIfRequired(DiskStore.java:673)
at net.sf.ehcache.store.DiskStore.spoolAndExpiryThreadMain(DiskStore.java:642)
at net.sf.ehcache.store.DiskStore.access$900(DiskStore.java:67)
at net.sf.ehcache.store.DiskStore$SpoolAndExpiryThread.run(DiskStore.java:1116)

七月 03, 2015 9:57:46 上午 net.sf.ehcache.store.DiskStore throwableSafeFlushSpoolIfRequired
严重: org.hibernate.cache.StandardQueryCache Cache: Could not flush elements to disk due to PermGen space. Continuing...
java.lang.OutOfMemoryError: PermGen space