I had an interesting insight I had using this method. In my python code I was clicking a cart button and the or "|" ONLY works with separate xpath statements like so ...
WebDriverWait(webdriver,20).until(EC.visibility_of_element_located((By.XPATH,"//*[@class='buttoncount-1'] | //button[contains(text(), 'Add to Cart')]")))
or
btn = webdriver.find_element_by_xpath("//*[@class='buttoncount-1'] | //button[contains(text(), 'Add to Cart')]")
I found that "or" ONLY works when they share the same bracket []
WebDriverWait(driver,10).until(EC.element_to_be_clickable((By.XPATH,"//button[contains(text(), 'Add to Cart') or contains(text(),'Buy')]"))).click()
And since you're here. If you're curious about "and" statements this worked for me...
WebDriverWait(driver,10).until(EC.element_to_be_clickable((By.XPATH,"//button[contains(text(), 'Continue To Order Rev')][@data-attr='continueToOrderReviewBtn']"))).click()
Simply pairing two separate statements was sufficient. No "and" necessary.
Note: This was all in python. I do not know how this will transfer over to java. Hope this was somewhat useful. It took me a few migraines to narrow this down.