找不到 Maven 资源

Question

I want to include a text file in a maven project. The code itself compiles, but everytime I try to run it, whether in VS Code or at Command Line, I get: java.io.FileNotFoundException: The provided file path /lightdm-forum.txt does not exist. The file is located at src/main/resources/, which is the default.

Code Snippet:

    public static void main(String[] args) throws Exception {

        StreamExecutionEnvironment env = StreamExecutionEnvironment.createLocalEnvironment();

        DataStream<Tuple2<String, Integer>> dataStream = env
                .readTextFile("/lightdm-forum.txt")
                .flatMap(new Splitter())
                .keyBy(0)
                .sum(1);

        dataStream.print();

        env.execute("Socket Stream WordCount");
    }

Maven seems to recognize the file and copies it to the classpath root:

[INFO] --- maven-resources-plugin:3.0.2:resources (default-resources) @ WordCount_Stream ---
[INFO] Using 'UTF-8' encoding to copy filtered resources.
[INFO] Copying 1 resource

After compiling, the structure in the target folder looks like this:

.
├── classes
│   ├── com
│   │   └── lmu
│   │       └── WordCount_Stream
│   │           ├── WordCounter$Splitter.class
│   │           └── WordCounter.class
│   └── lightdm-forum.txt

So the file has been copied, but it is not found when I try to run the project. Any ideas?

Answer 1

You use /lightdm-forum.txt which is a path as global path. May you try to use a relative path like path/to/your/subfolder/or/file or ../path/to/upper/folder/and/other/folders .

Maybe a better solution could be the usage of a classloader like Thread.currentThread().getContextClassLoader().getResource(resourceName) . With that you will be able to load files from maven resource package (src/Main/resources by default, Van be also customized in pom.xml)

Hope it helps!