Hamcrest check if value is null or empty array

Nikolai Golub ：

I have a code that returns JSON where one of the fields may be null or an empty array.

I have the following code to check:

import static org.hamcrest.core.AnyOf.anyOf;
import static org.hamcrest.CoreMatchers.nullValue;
import static org.hamcrest.Matchers.blankOrNullString;

// io.restassured.response
getResponse.then()
   .assertThat()
   .body("entity.fields", anyOf(nullValue(), emptyArray()))

But the output is not clear

java.lang.AssertionError: 1 expectation failed.
JSON path entity.fields doesn't match.
Expected: (null or an empty array)
  Actual: []

What is incorrect in this setup?

Wilfred Clement:

JSON arrays are lists of values, so use empty() instead of emptyArray()

assertThat().body("entity.fields", anyOf(nullValue(),empty()));

when

{"entity":{"fields":"Wilfred"}}

Expected: (empty or empty collection)

Actual: Wilfred

AssertionError returns

when

{"entity":{"fields":null}} or {"entity":{"fields":[]}}

Verify correctly

I had this problem sometimes, I found this link while searching for details

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