Reading static file in java using ant build

Question

I am new to ANT and having some trouble handling static files which I need to read via my Java code. I have the following structure:

build main example resository SomeClass.class data data.json src example repository SomeClass.java test

In SomeClass.java I need to read the data.json file but I am getting error in resolving path. I think its related to ant somehow.

public class SomeClass { class SomeClass extends ArrayList<Quote> {} public Quote[] all() { String path = "../../../data/data.json"; Gson gson = new Gson(); try { BufferedReader br = new BufferedReader(new FileReader(path)); return gson.fromJson(br, Quote[].class); } catch (IOException e) { e.printStackTrace(); } return new Quote[]{}; } }

I am getting the following error:

java.io.FileNotFoundException:

I think since ant it putting the files in build folder hence I may need to put my files somewhere there too, I have tried that too but I think I need some more help.

janos · Accepted Answer · 2016-07-31 15:03:44Z

A relative path is calculated relative from the execution directory. If you execute ant in the project root, then the relative path from there is data/data.json, not ../../../data/data.json.

When getting "File not found" errors, it's good to verify the execution directory, either in a debugger, or by inserting a print statement, for example:

System.out.println(new File(".").getAbsolutePath());

From the output, you will know faire and square in which directory the process is running in, and you will be able to calculate the correct relative path.

I don't know how many hours of life I have wasted finding this, why java has to do this to me.
Just one more thing, in production I would like to ship everything in a single file, can I somehow put my data file in the build folder and reference it from there?
That will depend on the execution directory of the process that will run your program.

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