CODEWITHSUNDEEP
javagradleresourcesclasspath
djthoms
djthoms

Reputation: 3096

getResource() is returning null with Gradle project

I'm aware there are several other questions regarding this...

But my problems seems to be a bit different because I seem to have all of the necessary things to NOT have this problem.

The code:

 this.getClass().getResource("checkstyle_whitespace.xml"); // null

The issue is that I've verified my classpath by inspecting the class loader in the debugger. Here's what I am seeing:

 27 = {URL@1235} "file:/Users/dennis/Documents/Development/java/java-grader/build/classes/main/"
 28 = {URL@1236} "file:/Users/dennis/Documents/Development/java/java-grader/build/resources/main/"

Blow is a quick tree of my directory structure. See build/resources and src/main/resources. The files are being copied when gradle builds my project.

├── build
│   ├── classes
│   │   ├── main
│   │   │   └── javaGrader
│   │   └── test
│   │       └── javaGraderTest
│   └── resources
│       └── main
│           ├── checkstyle_whitespace.xml
│           └── grammars
├── src
│   ├── main
│   │   ├── java
│   │   │   └── javaGrader
│   │   └── resources
│   │       ├── checkstyle_whitespace.xml
│   │       └── grammars
│   └── test
│       ├── java
│       │   └── javaGraderTest
│       └── resources
│           └── mini_test
├── target
│   ├── classes
│   ├── generated-sources
│   │   └── annotations
│   └── generated-test-sources
│       └── test-annotations
└── test_assets

From what I understand, the files should be accessible because they're in build. Correct me if I am wrong...

Upvotes: 20

Views: 16208

Answers (2)

Lasitha Lakmal
Lasitha Lakmal

Reputation: 880

Create a folder called "resources" in the same Location that java folder exist in the main folder of the project. and locate all the images and other resources into the "resources" folder. the get those like this

new ImageIcon(getClass().getClassLoader().getResource("image.png"));

Upvotes: 1

JB Nizet
JB Nizet

Reputation: 691635

If you pass a resource path that doesn't start with a / to Class.getResource(), the class loader looks for the resource in the package of the class. Not at the root. Your code should be

this.getClass().getResource("/checkstyle_whitespace.xml")

or

this.getClass().getClassLoader().getResource("checkstyle_whitespace.xml")

Upvotes: 26

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