Java process consume 100% CPU on Oracle Applications R12.1.x and 11i (Doc ID 1297436.1)

Last updated on JULY 28, 2016

Applies to:

Oracle EBS Applications Performance - Version 11.5.10.2 to 12.1.3 [Release 11.5.10 to 12.1]
Information in this document applies to any platform.

Symptoms


On Oracle Applications R12.1.x or 11i, you will notice that Java process is consuming 100% of the CPU on all the middle/web tiers and causing slow performance for all users.

Adding to the above symptom and if you reviewed the (OACore) JVM log file you will find that JVM is doing massive GC (garbage collection) very quickly almost in few milliseconds as following pattern:

......
54089.100: [GC 540340K->191048K(699008K), 0.0079480 secs]
54089.359: [GC 540424K->191036K(699008K), 0.0081470 secs]
54089.621: [GC 540412K->191052K(699008K), 0.0077670 secs]
54089.902: [GC 540428K->191052K(699008K), 0.0083930 secs]
54090.156: [GC 540428K->191056K(699008K), 0.0081120 secs]
54090.416: [GC 540432K->191040K(699008K), 0.0084900 secs]
54090.671: [GC 540416K->191040K(699008K), 0.0082380 secs]
54090.927: [GC 540416K->191060K(699008K), 0.0101760 secs]
54091.185: [GC 540436K->191060K(699008K), 0.0088920 secs]
54091.445: [GC 540436K->191060K(699008K), 0.0079990 secs]
54091.699: [GC 540436K->191044K(699008K), 0.0081490 secs]
54091.953: [GC 540420K->191072K(699008K), 0.0089860 secs]
54092.216: [GC 540448K->191056K(699008K), 0.0080700 secs]
54092.484: [GC 540432K->191072K(699008K), 0.0084660 secs]
54092.740: [GC 540448K->191072K(699008K), 0.0103380 secs]
54093.008: [GC 540448K->191076K(699008K), 0.0082910 secs]
......


Then at the same time the issue is occurring and when looking at Apache access log file, you will see a URL for the login to your instance similar to the following:

10.4.3.244 - - [18/Oct/2010:08:49:06 +1100] "GET
/OA_HTML/AppsLogin?requestUrl=https%3A%2F%2Febs.oracle.com%3A443%2FOA_
HTML%2FOA.jsp%3Fpage%3D%252Foracle%252Fapps%252Ffnd%252Fframework%252Fnavigate
%252Fwebui%252FHomePG%26homePage%3DY%26OAPB%3DFWK_HOMEPAGE_BRAND%26transaction
id%3D157341396%26oapc%3D3%26oas%3DT51swYOdFR5ztUuXEwOHqQ..&cancelUrl=https%3A%
2F%2F ebs.oracle.com %3A443%2FOA_HTML%2FAppsLogin&errText=You+have+insuf
ficient+privileges+for+the+current+operation. HTTP/1.1" 500 0 302
"https:// access.oracle.com /ebsauth_prdebs/OAMLogin.jsp" "Mozilla/4.0
(compatible; MSIE 8.0; Windows NT 6.1; WOW64; Trident/4.0; SLCC2; .NET CLR
2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0;
NET4.0C; .NET4.0E)"



Cause

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