JAVA_SECURITY_FILE=/usr/lib/jvm/java/conf/security/java.security
SECURERANDOM=securerandom.source
if grep -q "^$SECURERANDOM=.*" $JAVA_SECURITY_FILE; then
    sed -i "s|^$SECURERANDOM=.*|$SECURERANDOM=file:/dev/urandom|" $JAVA_SECURITY_FILE
else
    echo $SECURERANDOM=file:/dev/urandom >> $JAVA_SECURITY_FILE
fi