Reason:
Too many client connecting to the applications, Number of requests are more than enough that the Server process can not respond or process to new coming requests prior to reaching timeout period.
Solutions:
To resolve this issue, need to resize OC4J oacore JVM heap size as well as oacore processes in context file.
In 11i , those changes will be made in $IAS_ORACLE_HOME/Apache/Jserv/etc/jserv.conf.
while in R12 in the $ORA_CONFIG_HOME/10.1.3/opmn/conf/opmn.xml.
The Heap Size is configured by parameter s_oacore_jvm_start_option, s_forms_jvm_start_option in R12. Increase heap size as per the load with following.
-Xmx1024M -Xms512M -XX:MaxPermSize=512M
Note: Take backup before making any changes in opmn.xml file.
