java allocate

gistfile1.java

public class ReflectionUtils {
    
    public static <T> T allocate(Class<?> clazz) {
        Object instance = null;
        Object unsafe = getUnsafe();
        Method allocate;
        try {
            allocate = unsafe.getClass().getDeclaredMethod("allocateInstance", Class.class);
            instance = allocate.invoke(unsafe, clazz);
        } catch (Exception e) {
            throw new IllegalArgumentException("Not possible to instanciate " + clazz.getName());
        }
        return (T) instance;
    }

    private static Object getUnsafe() {
        try {
            Class<?> unsafeClass = Class.forName("sun.misc.Unsafe");
            Field unsafeField = unsafeClass.getDeclaredField("theUnsafe");
            unsafeField.setAccessible(true);
            Object unsafeObj = unsafeField.get(unsafeClass);
     
            return unsafeObj;
        }
        catch (Exception e) {
            return null;//UNSAFE_ERROR_CODE;
        }
    }

}


public class Pessoa {
	private Long id;
	
	public Pessoa(Long id) {
		this.id = id;
	}
	
	public Long getId() {
		return id;
	}
	public void setId(Long id) {
		this.id = id;
	}

}


public class Test {
    public static void main(String[] args) {
        System.out.println(allocate(Pessoa.class)); //Pessoa@1f
    }

}