Spring boot: How to read resource from classpath in unit test

Question

I'm trying to read a file from classpath like this in my unit test:

@Value("classpath:state.json")
Resource stateFile;

I have state.json file in src/test/resources directory. When I try to read this file using stateFile.getInputStream(), it doesn't return any contents. What am I doing wrong?

My test class is annotated like this

@RunWith(SpringRunner.class)
@SpringBootTest

I can see that the code fails if I try with a incorrect file. So I think its seeing the file in classpath but for some reason not reading contents.

Answer 1

You cant access a @Value resource unless its a property defined. It should be this way.

@Value("${stateJsonPath}")
Resource stateFile;

If you have to get the resource from hardcoded path then use this way.

Resource stateFile = new ClassPathResource("state.json");