Seeing slow startup of SOA OSB and other Java based application then verify Entropy

We faced slow startup of Domain Creation, slow startup  of Domain and resolved using proper Entropy settings:
You should be able to select the faster-but-slightly-less-secure /dev/urandom on Linux using: 
$JAVA_HOME/jre/lib/security/java.security 
Default /dev/urandom is configured, but as mentioned this is ignored by Java. 
-Djava.security.egd=file:/dev/urandom 
However, this doesn’t work with Java 5 and later (Java Bug 6202721). The suggested work-around is to use:
-Djava.security.egd=file:/dev/./urandom(note the extra ‘/./’) 
  
You can also set in your environment like below in setDomainEnv.sh 
if [ "${USER_MEM_ARGS}" != "" ] ; then 
MEM_ARGS="${USER_MEM_ARGS} 
export MEM_ARGS 
fi 
MEM_ARGS="${MEM_ARGS} -Djava.security.egd=file:/dev/./urandom" 
  
  
Or at runtime: 
export CONFIG_JVM_ARGS="-Djava.security.egd=file:/dev/./urandom" 
/u01/app/oracle/product/fmw/wlserver_12.1/common/bin/config.sh 
  
References:
http://theheat.dk/blog/?p=1539
http://stackoverflow.com/questions/137212/how-to-solve-performance-problem-with-java-securerandom