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Avoiding JVM Delays Caused by Random Number Generation

The library used for random number generation in Sun’s JVM relies on /dev/random by default for UNIX platforms. This can potentially block the WebLogic SIP Server process because on some operating systems /dev/random waits for a certain amount of “noise” to be generated on the host machine before returning a result. Although /dev/random is more secure, BEA recommends using /dev/urandom if the default JVM configuration delays WebLogic SIP Server startup.

To determine if your operating system exhibits this behavior, try displaying a portion of the file from a shell prompt: 

head -n 1 /dev/random

If the command returns immediately, you can use /dev/random as the default generator for SUN’s JVM. If the command does not return immediately, use these steps to configure the JVM to use /dev/urandom:

  1. Open the $JAVA_HOME/jre/lib/security/java.security file in a text editor.
  2. Change the line:
    3. securerandom.source=file:/dev/random

    to read: 

    securerandom.source=file:/dev/urandom
  3. Save your change and exit the text editor.

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