How do I get the instance of sun.misc.Unsafe?

Question

How do I get the instance of the unsafe class?

I always get the security exception. I listed the code of the OpenJDK 6 implementation. I would like to mess around with

Answer 1

There is another way of doing it you can find in:

http://mishadoff.com/blog/java-magic-part-4-sun-dot-misc-dot-unsafe/

in unsafe source code, you can find:

@CallerSensitive
public static Unsafe getUnsafe() {
    Class caller = Reflection.getCallerClass();
    if (!VM.isSystemDomainLoader(caller.getClassLoader()))
        throw new SecurityException("Unsafe");
    return theUnsafe;
}

you can add your class or jar to bootstrap classpath by using Xbootclasspath, as below:

java -Xbootclasspath:/usr/jdk1.7.0/jre/lib/rt.jar:. com.mishadoff.magic.UnsafeClient