CODEWITHSUNDEEP
javamaven-2junit
Krzysztof Krasoń
Krzysztof Krasoń

Reputation: 27476

Loading a file from dependency jar inside maven junit

I'm using maven 2.1.0 and have a project with multiple modules. Example modules:

spr-common has a dependency on spr-resources

spr-resources contains only files, no classes.

spr-common has a junit in which needs to load a file from spr-resources jar.

I used:

String fileName = getClass().getResource("/jaskeyfile.3DES").getFile();
is = getClass().getClassLoader().getResourceAsStream(fileName);
is.read(data);

And this works when I run the test in IntelliJ, but when I do mvn test, it fails with NullPointerException when I try to do read() on it.

Why is this happening? It should read a file from dependency just fine.

Also, pom.xml in spr-common has dependency on spr-resources (tried both with scope test and without it)

EDIT: I tried also

getClass().getClassLoader().getResourceAsStream("/jaskeyfile.3DES");

with no luck.

EDIT2: The given file exists in the resulting jar, so I guess it should be accessible.

Upvotes: 4

Views: 6291

Answers (2)

trask
trask

Reputation: 716

I believe the issue may be with the leading slash. I think both of these should work:

  • getClass().getResourceAsStream("/jaskeyfile.3DES")
  • getClass().getClassLoader().getResourceAsStream("jaskeyfile.3DES")

Class.getResourceAsStream() takes a path relative to the class's package directory so it accepts the leading slash.

ClassLoader.getResourceAsStream() takes an absolute path already so it doesn't accept the leading slash.

Upvotes: 2

Gary
Gary

Reputation: 7257

Check everything carefully

Here's a list to work through:

  1. The file jaskeyfile.3DES is located in src/main/resources within the spr-resources module
  2. Your local repository contains the latest version of spr-resources-x.y.z-SNAPSHOT.jar (or you've released it/versioned it directly) and you've definitely used mvn clean install on it
  3. The spr-common module is referencing the correct (named) version of spr-resources-x.y.z.jar (scope of compile will be seen on both test and compile classpaths)

If all the above are true then your getClass().getResourceAsStream("/jaskeyfile.3DES") invocation should work. I use this structure all the time in my projects so you're not asking for the moon or anything here.

Upvotes: 3

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