Classpath Resource Not Found When Running as Jar

Classpath resource not found when running as jar

resource.getFile() expects the resource itself to be available on the file system, i.e. it can't be nested inside a jar file. This is why it works when you run your application in STS (Spring Tool Suite) but doesn't work once you've built your application and run it from the executable jar. Rather than using getFile() to access the resource's contents, I'd recommend using getInputStream() instead. That'll allow you to read the resource's content regardless of where it's located.

Spring-Boot Resource Not Found when using executeable Jar

Okay, already I found the real problem and the solution.

First, the application use the correct path to the csv files, but there is another issue when using an executable jar what I found under following link. Stackoverflow-Link

Before I come to issue with executable jar I used following solution for getting CSV-File (Issue is getFile()):

final List<String> resourceLines = FileReadUtils.readLines(specialisationResource.getFile());
for (final String line : resourceLines) {
  data.add(getNewTransientSpecialisation(line));
}

But in executeable jar I cant use my resource as file, I need to use it as stream, see provided link above. So I needed to change my code. If you prefer using native java, you can do follows:

final InputStream inputStream = specialisationResource.getInputStream();
final BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream));

String line;
while ((line = bufferedReader.readLine()) != null) {
    data.add(getNewTransientSpecialisation(line));
}

I prefer using frameworks and use apache commons like follows:

final List<String> resourceLines = IOUtils.readLines(specialisationResource.getInputStream());
for (final String line : resourceLines) {
    data.add(getNewTransientSpecialisation(line));
}

So just remember, don't use File() for getting resource, always use stream do avoid that issue from beginning :-)

Hope that helps someone.

Can't locate resource file in JAR

You need to read particular file from that directory as a classpath resource instead of java.io.File

getClass().getResourceAsStream("relative/class/path/to/resource");

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