Speed up Weblogic Server startup times

Question

At my work, we use Weblogic Server to host an enterprise portal. Which is fine.

However, I\'ve recently had the opportunity to use Tomcat for some side projects, and I a

Answer 1

On the memory consumption issue, you might want to try setting the memory parameters of the JVM used by your WebLogic server. Log in to your WL Web Admin Console and go to Environment/Servers/[your server]/Configuration/Server Start and, on the "Arguments", setting something like -Xms256m -Xmx256m will set your JVM's initial (Xms) and maximum (Xmx) heap size to 256 megabytes. You will want to play around with these numbers and find the best values for your environment. But please be aware that your Eclipse instance might be consuming a lot of memory as well.

Regarding the startup time, although a bit larger than I would expect, they seem OK. This problem is very frequent, and I don't think you will be able to definitely solve it. WebLogic has much more features than Tomcat, and this reflects in other characteristics of the environment (like startup time).

Turns out Weblogic uses random number generator during start up. Because of the bug in java it reads ‘randomness’ from /dev/random. /dev/random is very good random numbers generators but it is extremely slow. It takes sometimes 10 minutes or more to generate one number. /dev/urandom is not that good, but it is instant. Java somehow maps /dev/urandom file to /dev/random. That’s why default settings in $JAVA_HOME/jre/lib/security/java.security are useless.

Possible solutions: 1) Add “-Djava.security.egd=file:/dev/./urandom” (/dev/urandom does not work) to java parameters.

Worse but working solution is: 2) mv /dev/random /dev/random.ORIG ; ln /dev/urandom /dev/random

3) Best solution is to change $JAVA_HOME/jre/lib/security/java.security Replace securerandom.source with

securerandom.source=file:/dev/./urandom

This problem does not happen under windows because it uses different implementation of /dev/random.

It takes seconds to start weblogic server now.