JSONpath in java

Question

JSON file

[ { customerId:1}, { customerId:2 }, { customerId:3>} ]

in JAVA with

Response resp = when().get("link");

i received the json to resp file.

Now from the resp file - i'm tring to create a arrray - soo that all the values of the customerId is saved in that array using the below code

ArrayList list = resp
                    .then()
                    .contentType(ContentType.JSON) 
                    .extract()
                    .path(".customerId");

but its not working.

can someone help me out.?