[FIXED] incompatible types error is displayed after upgrading Spring to 5.3.20

Issue

all, I have a maven java project with junits: for example:

    import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.jsonPath;
    import com.jayway.jsonassert.impl.matcher.IsCollectionWithSize;      
 @Test
    public void test() throws Exception {
        getMockMvc().perform(put("/bla")
                .contentType(MediaType.APPLICATION_JSON_VALUE)
                .accept(MediaType.APPLICATION_JSON_VALUE)
                .characterEncoding("UTF-8")
                .content("{\n" +
                        "\n" +
                        "\"eventTypes\": [\"BLA\"]\n" +
                        "\n" +
                        "}"))
                .andExpect(jsonPath("$.eventTypes", IsCollectionWithSize.hasSize(1)));
    }

the line that run the check: jsonPath("$.eventTypes", IsCollectionWithSize.hasSize(1)

the jsonPath is part of Spring libary verion 4.3.30 and the IsCollectionWithSize.hasSize is taken form com.jayway.jsonpath.json-path-assert verion 2.4

everything worked ok until I upgraded the Spring to 5.3.20 The error is:

incompatible types: cannot infer type-variable(s) T,capture#79 of ? super java.util.Collection<? extends E>,E
[ERROR] (argument mismatch; org.hamcrest.Matcher<capture#80 of ? super java.util.Collection<? extends E>> cannot be converted to org.hamcrest.Matcher<? super java.lang.Object>)
[ERROR] -> [Help 1]

Has anyone had such a problem? And can offer a solution?

Solution

ok so I fixed it by changing one of the imports. instead of this:

import com.jayway.jsonassert.impl.matcher.IsCollectionWithSize;

I used this:

import static org.hamcrest.Matchers.hasSize;

and change the code from this:

andExpect(jsonPath("$.eventTypes", IsCollectionWithSize.hasSize(1)));

to this:

andExpect(jsonPath("$.eventTypes", hasSize(1)))

Answered By - Tal Levi
Answer Checked By - Dawn Plyler (JavaFixing Volunteer)