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I'm struggling to resolve a problem which seems very strange to me. I've looked trough at least five similar topics here on StackOverflow and neither of them provided an answer. But to the problem itself: I want to read in a file on app's startup. When I run the app in the IDE (IntelliJ Idea) everything is OK. Although when I build it with Gradle Java throws FileNotFoundException:
java.io.FileNotFoundException: file:/home/user/IdeaProjects/time-keeper/build/libs/time-keeper-0.7-beta.jar!/data.csv (No such file or directory)
The path to the file is correct, the file exists, the jar has proper permissions. The declaration:
File dataFile = new File(ClassLoader.getSystemResource("data.csv").getFile());
Handle<TimeTask> dataHandle = new FileHandle(dataFile);
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How to Fix FileNotFoundException. Since FileNotFoundException is a checked exception, a try-catch block should be used to handle it. The try block should contain the lines of code that can throw the exception and the catch block should catch and handle the exception appropriately.
How to avoid FileNotFoundException in java? Please ensure file exists when you try to read from file from path exists (using FileInputStream) to avoid FileNotFoundException. Please ensure file exists when we try to acces file from invalid path using RandomAccessFile to avoid FileNotFoundException.
1. Introduction. In this article, we're going to talk about a very common exception in Java – the FileNotFoundException.
FileNotFoundException is a checked exception is used that occurs when a file path specified for accessing does not exist or is inaccessible. With the checked exception, it means that the java compiler checks at compile time if this exception has been handled or not; otherwise, a compile-time error occurs.
As long as data.csv is a file itself, everything works. This is probably true as long as you run the application from within your IDE. In that case,
ClassLoader.getSystemResource("data.csv").getFile()
returns the path of a file on your file system. However, once gradle generates a JAR which contains the file data.csv, the above call produces
/home/user/IdeaProjects/time-keeper/build/libs/time-keeper-0.7-beta.jar!/data.csv
While this is technically the correct path (data.csv within the JAR), it is no longer a valid file system path. The java.io.File utilities cannot handle arbitrary URLs or files within archives. data.csv simply is no File, but an entry within an archive.
If you want to read the "file", you can use getSystemResourceAsStream which opens a resource (no matter whether it is a "real" file or not) as an InputStream.
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