CODEWITHSUNDEEP
javamaven
Glory to Russia
Glory to Russia

Reputation: 18712

How to read a file from a Maven dependency project?

I have two Maven projects A and B. B depends on A.

In A, I have a file someFile.txt in the src/main/resources folder. 

public class SomeAClass
{
    public void someMethod()
    {
        final InputStream inputStream =
                Thread.currentThread()
                        .getContextClassLoader()
                        .getResourceAsStream("someFile.txt");
        final List<String> lines = IOUtils.readLines(inputStream);

        ...
    }
}

In A's tests, this works fine.

Now imagine I want to use that same code in B, including the ability to read the data from src/main/resources/someFile.txt.

Right now, calling SomeAClass.someMethod() from project B causes a NullPointerException and I suspect it's because src/main/resources/someFile.txt cannot be found.

How can I change the code for getting the input stream for src/main/resources/someFile.txt so that it works both in A's unit tests and when executing B (B is a Spring Shell based console application) ?

Upvotes: 2

Views: 5476

Answers (1)

Iker Aguayo
Iker Aguayo

Reputation: 4115

Are you sure that the problem is there, because I have a similar approach and it works right.

That was my first attempt

If you are using someFile.txt as a resource in your tests (and only there, if you are using in your main project, ignore the post), instead of using src/main/resources, maybe it would be better to put that file and others which are used in src/test/resources.

But

If you put these test files in src/test/resources, remember that the test resources are not contained in the project artifact, so you can not access them althoug you include the dependency in your pom.

What I did (something like yours)

Create new module (test-resources) and put the resources in src/main/resources. The module is used as dependency in the projects I need with test scope. But what I used was ClassPathResource.

    ClassPathResource resource = new ClassPathResource("the_file"); 
    resource.getInputStream()

Upvotes: 5

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