Java pass a list type to a generic method?

Question

I have written the following method that takes a generic type. How do i pass a list of type Order as the response type?

public <T> ServiceResponse<T> fetchGet(String url, Class<T> responseType, boolean authRequired);

// This works just fine
fetchGet("MY_URL", Order.class, true);

// How do i pass a list?
fetchGet("MY_URL", List<Order>.class, true);

aryaxt · Accepted Answer · 2013-10-03 21:26:41Z

3

I ended up using an array instead of a list. I had to pass this to RestTemplate exchange method, and passing an array instead of List worked.

fetchGet("MY_URL", Order[].class, true);

answered Oct 3, 2013 at 21:26

aryaxt

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Louis Wasserman · Accepted Answer · 2013-10-03 21:17:47Z

2

You're going to have to use List.class and do an explicit cast afterwards. Or you could do the alternate hack of calling fetchGet("MY_URL", (Class<List<Order>>) (Class) List.class, true);.

edited Oct 3, 2013 at 21:17

answered Oct 3, 2013 at 21:11

Louis Wasserman

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2 Comments

aryaxt Over a year ago

I'm wondering if jackson framework would know what generic type it should convert my data to. Will give it a try

aryaxt Over a year ago

Cannot cast Class<List> to Class<List<Order>>>

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