FileSystemNotFoundException in a Dockerized Spring Boot Application

Question

I'm trying to load a file in a spring boot application that is running inside a Docker container but I'm getting the following exception:

java.nio.file.FileSystemNotFoundException 
 at com.sun.nio.zipfs.ZipFileSystemProvider.getFileSystem(ZipFileSystemProvider.java:171) ~[zipfs.jar:1.8.0_191] 
   at com.sun.nio.zipfs.ZipFileSystemProvider.getPath(ZipFileSystemProvider.java:157) ~[zipfs.jar:1.8.0_191] 
 at java.nio.file.Paths.get(Paths.java:143) ~[?:1.8.0_191] 
 at app.metrics.collector.util.FileUtils.getContentAsSingleLine(FileUtils.java:17) ~[classes!/:?] 
     at app.metrics.collector.jobs.DbQueryJob.generatePreparedStatement(DbQueryJob.java:54) ~[classes!/:?] 
at app.metrics.collector.jobs.DbQueryJob.execute(DbQueryJob.java:36) ~[classes!/:?] 
  at org.quartz.core.JobRunShell.run(JobRunShell.java:202) [quartz-2.3.0.jar!/:?]

The error does not appears when I execute the jar outside the container.

Here is the Dockerfile:

FROM openjdk:8-jdk-alpine
ADD build/app.jar app.jar
ENTRYPOINT ["java","-Djava.security.egd=file:/dev/./urandom","-jar","app.jar"]

And here is the method that loads the file:

    public static String getContentAsSingleLine(String fileName) throws URISyntaxException, IOException {
    String data;
    Path path = Paths.get(FileUtils.class.getClassLoader().getResource(fileName).toURI());
    Stream<String> lines = Files.lines(path);
    data = lines.collect(Collectors.joining(StringUtils.SPACE));
    lines.close();
    return data;
}

The file is located in the resource folder:

/src/main/resources/database/file.sql

and the argument passed to the method is:

"database/file.sql"

Does anyone have an idea of the cause of the issue and its possible solution ?

Ozan · Accepted Answer · 2019-02-27 00:37:54Z

8

I think by execute the jar outside the container you mean running the project in your IDE. Then database/file.sql is actually available as a file.

In the jar, the file is not available for Paths.get() to actually handle.

When trying to access the resource you should use

InputStream in = getClass().getResourceAsStream(fileName);

you can then use java.util.Scanner to collect the lines:

String data = new Scanner(in)
 .useDelimiter('\n')
 .tokens()
 .collect(Collectors.joining(StringUtils.SPACE));

edited Feb 27, 2019 at 0:37

answered Feb 27, 2019 at 0:14

Ozan

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2 Comments

Kiskae Over a year ago

Internally Files.lines uses BufferedReader.lines. Which can link between the InputStream and the code already in use. It should however be noted that closing the stream does not close the reader it is reading from.

andres.enix Over a year ago

Thank you Ozman ! You were right the issue was solved when I changed the way to read the file. I also had to change the argument this way: "/database/file.sql". But as I have to use Java 8 I couldn't use the .tokens().collect(...) methods.

vkumbhar94 · Accepted Answer · 2019-02-27 00:11:30Z

-1

The exception looks to be dealing with zip / archive file, please ensure once that whether it is while loading sql or any other file?

answered Feb 27, 2019 at 0:11

vkumbhar94

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