node restarted - Caught OutOfMemoryError! Node will exit with exit code 666

[former_member482483]

Hi,

I am encountering java out of memory error occasionally in SAP Netweaver Web AS 6.40. This happen even when the Web AS was restarted less than one day. On checking the std_server.out log, I noticed a lot of unloading of the class sun.reflect.Generated* and that the perm memory seems not garbage collected at all.

[Unloading class sun.reflect.GeneratedSerializationConstructorAccessor309]

[Unloading class sun.reflect.GeneratedMethodAccessor487]

[Unloading class sun.reflect.GeneratedMethodAccessor4127]

[Unloading class sun.reflect.GeneratedSerializationConstructorAccessor1280]

[Unloading class sun.reflect.GeneratedSerializationConstructorAccessor1312]

: 490151K->454182K(1923072K), 6.7437627 secs] 490561K->454182K(2053632K), [Perm : 196607K->196607K(196608K)], 6.7440758 secs]

28050.566: [Full GC 28050.566: [Tenured: 454182K->358089K(1923072K), 7.3774607 secs] 454214K->358089K(2053632K), [Perm : 196607K->165707K(196608K)], 7.3778050 secs]

FATAL: Caught OutOfMemoryError! Node will exit with exit code 666

================================================================================

getThreadDump : Wed Aug  1 15:07:16 2012

FATAL: Caught OutOfMemoryError! Node will exit with exit code 666

================================================================================

java.lang.OutOfMemoryError

Full thread dump Java HotSpot(TM) 64-Bit Server VM (1.4.2_27-b03 mixed mode):

I suspect there could be some memory leak but could not figure out where.

Please help.

Thanks.

std_server0.out.txt.zip

[Former Member]

Hello, The perm size of of the heap has run out of memory:

[Perm : 196607K->165707K(196608K)], 7.3778050 secs]

It seems that the perm size setting is very low.  AS the JAVA hotspot version is 64bit you may set heap settings as follows:

-XX:NewSize=341m

-XX:MaxNewSize=341m

-XX:MaxPermSize=384m

-XX:PermSize=384m

-Xmx2048m 

-Xms2048m

The other VM settings can be found the note mentioned the colleague previously.

Kind regards

[Asha_Pillai]

Hello,

Please check if all the JVM parameters are configured as per the following SAP note.

723909 Java VM settings for J2EE 6.40/7.0

To find out what is causing memory leak, please capture heap dumps by following the process

described in the note

1004255 How to create a full HPROF heap dump of J2EE Engine

You can then analyze these dumps using

https://www.sdn.sap.com/irj/sdn/wiki?path=/display/Java/Java+Memory+Analysis

Regards,

Asha