<?php
/*
Plugin Name: CPT
*/
function my_cpt_init() {
	register_post_type('product1', array( 'label' => 'product1' , 'public' => true ) );
	register_taxonomy('tax1','product1',array('label' => 'tax1' , 'hierarchical' => true));
	register_taxonomy('tax2','product1',array('label' => 'tax2' , 'hierarchical' => true));
}
add_action('init', 'my_cpt_init');

function my_rewrite_flush() {
	my_cpt_init();
	flush_rewrite_rules();
	wp_insert_term('exampleterm', 'tax1');
	wp_insert_term('exampleterm', 'tax2');
}
register_activation_hook(__FILE__, 'my_rewrite_flush');