Loading files from Resource folder using java jar

Question

I have download.sh file in my src/main/resource folder in maven project and I am reading it through below code

 ClassLoader classLoader = getClass().getClassLoader();
 File file = new File(classLoader.getResource("download.sh").getFile());

The file is reading when I run this as the standalone application.

If I run this as application using jar ex:-

java -jar runScript.jar SCHEMA_NAME

/Users/IdeaProjects/RunScript/target/file:/Users/IdeaProjects/RunScript/target/RunScripts.jar!/download.sh": error=2, No such file or directory

Can anyone help me in reading file from resource when executing with jar

how do you package your jar? – Kirill Simonov Dec 21 '17 at 03:35 — Kirill Simonov, Dec 21 '17 at 03:35
by running mvn clean install @Kirill Simonov – Ganesh Dec 21 '17 at 03:40 — Ganesh, Dec 21 '17 at 03:40
did you manage to solve this? – Kirill Simonov Dec 24 '17 at 05:12 — Kirill Simonov, Dec 24 '17 at 05:12

score 1 · Answer 1 · answered Dec 21 '17 at 03:50

I think this error happens when you try to read the file. This is because resources inside your jar are not files but streams. So you should use

getClass().getResourceAsStream("download.sh");

and then read that stream, for example:

InputStream resourceStream = getClass().getResourceAsStream("download.sh")
BufferedReader br = new BufferedReader(new InputStreamReader(resourceStream));
String line;
while ((line = br.readLine()) != null) {
    // do something
    System.out.println(line);
}

score 0 · Answer 2 · answered Dec 21 '17 at 03:16

0

I think you are not packaging your resources along with your jar. Please verify your jar contains the resource file (download.sh) with

jar -tvf <yourfile.jar> | grep -i download

answered Dec 21 '17 at 03:16

Sivaswami Jeganathan

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resource folder not created in jar. But all the files included in the immediate directory – Ganesh Dec 21 '17 at 03:40
1

@Ganesh That doesn't make sense. If the resources aren't in the JAR, why are you using `ClassLoader.getResource()`? – user207421 Dec 21 '17 at 06:07
@Ganesh, If you are using maven, try these links : https://stackoverflow.com/questions/6316462/maven-resource-files-put-java-class-files-and-property-files-in-same-directory (or) https://stackoverflow.com/questions/5637532/maven-how-to-place-resource-file-together-with-jar – Sivaswami Jeganathan Dec 25 '17 at 12:44

score 0 · Answer 3 · answered Dec 21 '17 at 05:06

0

Resources are not files. You can get their URLs, or input streams, but nothing you can do will turn a resource in a JAR file into a file on the disk that you can use with File. Short of unpacking the JAR file, that is.

answered Dec 21 '17 at 05:06

user207421

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Loading files from Resource folder using java jar

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