[rules-users] Drools6.0 Security Issues

Hello, everyone, Greetings! I want to use Drools6.0 in my project,but I found a security issue. The Drools6.0 automatically import the java.lang.* packages. As we all know, thess packages including some package such as Process class,which can damage the application's security. So, I want know how to prohibit some package from executing in rule configure file(including drl,decistion tablea) or program code. Thank you everyone . With my best wishes! Sincerely yours, philip