getResource（）在Gradle项目中返回null [英] getResource() is returning null with Gradle project
问题描述
我知道与此有关的还有其他问题...
I'm aware there are several other questions regarding this...
- Class.getResource() returns null
- Java - class.getResource returns null
- Calling context.getResources() returns null
- getClassLoader().getResource(filepath) returns a null pointer
但是我的问题似乎有所不同，因为我似乎拥有所有必要的东西而没有这个问题。
But my problems seems to be a bit different because I seem to have all of the necessary things to NOT have this problem.
代码：
this.getClass().getResource("checkstyle_whitespace.xml"); // null
问题是我已经通过检查调试器中的类加载器来验证我的类路径。这是我所看到的：
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/"
打击是我目录结构的快速树。请参见构建/资源和 src / main /资源。 gradle构建我的项目时，文件将被复制。
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
据我所知，文件应该可以访问，因为它们位于 build 中。如果我错了，请纠正我...
From what I understand, the files should be accessible because they're in build. Correct me if I am wrong...
推荐答案
如果您传递的资源路径不是以<$ c开头$ c> / 到 Class.getResource（），类加载器会在类包中查找资源。不是根本。您的代码应该是
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")
或
this.getClass().getClassLoader().getResource("checkstyle_whitespace.xml")
这篇关于getResource（）在Gradle项目中返回null的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
