Smooth obj lighting

Whenever i am trying to render a .obj model in minecraft it renders fine except for the lighting.

It renders the model with flat lighting but i am trying to get smooth lighting.

So far i couldn't figure out how to get it to work.

this is what i have:

@Override
public void renderTileEntityAt(TileEntity tile, double x, double y, double z, float f) {

	if(tile instanceof CannonLogic){

		CannonLogic cannon = (CannonLogic) tile;

		GL11.glPushMatrix();

		GL11.glShadeModel(GL11.GL_SMOOTH);

		GL11.glTranslated(x+0.5D, y, z+0.5D);
		GL11.glScalef(0.05F, 0.05F, 0.05F);

		bindTexture(texture);
		model.renderOnly("base");

		GL11.glRotatef(90F, 0.0F, 1.0F, 0.0F);
		GL11.glRotatef(cannon.getYaw(), 0.0F, 1.0F, 0.0F);

		model.renderAllExcept("base","barrel");

		model.renderOnly("barrel");

		GL11.glPopMatrix();
	}
}

Anyone knows how to enable smooth lighting in minecraft?