Loading csv file throws NullPointerException

Question

So i have 2 Files in the same Folder. "example.csv" and "example.jpg" but when i run this code, I get the path for example.jpg but loading the example.csv throws a Nullpointer.

System.out.println(this.getClass().getResource("/example.csv").getFile());
System.out.println(this.getClass().getResource("/example.jpg").getFile());

Thx for any help

What is the exact error with stack trace? Have you done any debugging? — Carcigenicate, Aug 30 '17 at 19:22
Are you sure the preceding `/` to the filename is necessary? — SHG, Aug 30 '17 at 19:25
Duplicate of https://stackoverflow.com/questions/2593154/get-a-resource-using-getresource or https://stackoverflow.com/questions/2343187/loading-resources-using-getclass-getresource/41781868#41781868 — geneSummons, Aug 30 '17 at 20:46
This question was closed as duplicate of the *wrong* question. It *is* a duplicate, but not of `What is a NullPointerException` — Panagiotis Kanavos, Sep 01 '17 at 08:22

score 1 · Accepted Answer · answered Aug 31 '17 at 02:17

1

I have placed .csv file in my class path and reading the file in static method. So please change according to your need, however you should be able to read the file by doing so.

InputStream inputStream = ReadFile.class.getResourceAsStream("User.csv");
BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream));
if (inputStream != null) {  
    System.out.println(" read csv file : "+reader.readLine());
}

answered Aug 31 '17 at 02:17

Mad-D

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thx that did the jobb ;) – Johannes Zahn Aug 31 '17 at 05:34
@JohannesZahn: glad it helped. can you accept the answer if this helped. – Mad-D Aug 31 '17 at 12:49

score 1 · Answer 2 · answered Aug 31 '17 at 02:29

1

Calling getFile() is futile. getResource() returns a URL within the JAR file. It isn't a file, and can't be treated as one. You can get the InputStream directly from the URL, or from getResourceAsStream() directly.

answered Aug 31 '17 at 02:29

user207421

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Ill try that, sounds promising – Johannes Zahn Aug 31 '17 at 05:24

Charles Knell · Answer 3 · 2017-08-30T21:58:23.747

The getResource method searches using the class loader, so:

You need to place your files in the same directory as your class files, or specify the directory relative to that directory. The code below requires them in the class files directory.

For placing them in the class files directory, remove the "/" from the file name.

System.out.println(this.getClass().getResource("example.csv").getFile());
System.out.println(this.getClass().getResource("example.jpg").getFile());

Loading csv file throws NullPointerException

3 Answers3