Read file from resources folder in Spring Boot

Question

I m using Spring Boot and json-schema-validator  I m trying to read a file called jsonschema json from the resources folder  I ve tried a few different ways but I can t get it to work  This is my code   ClassLoader classLoader   getClass   getClassLoader    File file   new File classLoader getResource  jsonschema json   getFile     JsonNode mySchema   JsonLoader fromFile file     This is the location of the file     And here I can see the file in the classes folder     But when I run the code I get the following error   jsonSchemaValidator error  java io FileNotFoundException   home user Dev Java Java 20Programs SystemRoutines target classes jsonschema json  No such file or directory    What is it I m doing wrong in my code

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Below is my working code   List lt sampleObject gt  list   new ArrayList lt  gt     File file   new ClassPathResource  json test json   getFile    ObjectMapper objectMapper   new ObjectMapper    sampleObject   Arrays asList objectMapper readValue file  sampleObject   class      Hope it helps one

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Very short answer  you are looking for your property in the scope of a particular class loader instead of you target class  This should work   File file   new File getClass   getResource  jsonschema json   getFile     JsonNode mySchema   JsonLoader fromFile file     Also  see this     What is the difference between Class getResource   and ClassLoader getResource     Strange behavior of Class getResource   and ClassLoader getResource   in executable jar Loading resources using getClass   getResource     P S  there can be an issue if the project has been compiled on one machine and after that has been launched on another or you run your app in Docker  In this case  paths to your resource folder can be invalid  In this case it would be better to determine paths to your resources at runtime   ClassPathResource res   new ClassPathResource  jsonschema json        File file   new File res getPath     JsonNode mySchema   JsonLoader fromFile file     Update from 2020  On top of that if you want to read resource file as a String in your tests  for example  you can use these static utils methods   public static String getResourceFileAsString String fileName        InputStream is   getResourceFileAsInputStream fileName       if  is    null            BufferedReader reader   new BufferedReader new InputStreamReader is            return  String reader lines   collect Collectors joining System lineSeparator            else           throw new RuntimeException  resource not found             public static InputStream getResourceFileAsInputStream String fileName        ClassLoader classLoader    CurrentClass  class getClassLoader        return classLoader getResourceAsStream fileName       Example of usage   String soapXML   getResourceFileAsString  some folder in resources SOPA request xml

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The simplest method to bring a resource from the classpath in the resources directory parsed into a String is the following one liner   As a String Using Spring Libraries             String resource   StreamUtils copyToString                  new ClassPathResource  resource json   getInputStream    defaultCharset       This method uses the StreamUtils utility and streams the file as an input stream into a String in a concise compact way   If you want the file as a byte array you can use basic Java File I O libraries   As a byte array Using Java Libraries    byte   resource   Files readAllBytes Paths get   src test resources resource json

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For me  the bug had two fixes     Xml file which was named as SAMPLE XML which was causing even the below solution to fail when deployed to aws ec2  The fix was to rename it to new sample xml and apply the solution given below  Solution approach https   medium com  jonathan henrique smtp reading-files-in-resource-path-from-jar-artifact-459ce00d2130   I was using Spring boot as jar and deployed to aws ec2 Java variant of the solution is as below     package com test   import java io BufferedReader  import java io IOException  import java io InputStreamReader  import java util stream Collectors  import java util stream Stream   import org slf4j Logger  import org slf4j LoggerFactory  import org springframework context support ClassPathXmlApplicationContext  import org springframework core io Resource    public class XmlReader        private static Logger LOGGER   LoggerFactory getLogger XmlReader class      public static void main String   args            String fileLocation    classpath cbs response xml         String reponseXML   null        try  ClassPathXmlApplicationContext appContext   new ClassPathXmlApplicationContext              Resource resource   appContext getResource fileLocation           if  resource isReadable                BufferedReader reader                 new BufferedReader new InputStreamReader resource getInputStream                Stream lt String gt  lines   reader lines              reponseXML   lines collect Collectors joining   n                              catch  IOException e            LOGGER error e getMessage    e

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Spent way too much time coming back to this page so just gonna leave this here       File file   new ClassPathResource  data data json   getFile

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stuck in the same issue  this helps me  URL resource   getClass   getClassLoader   getResource  jsonschema json    JsonNode jsonNode   JsonLoader fromURL resource

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if you have for example config folder under Resources folder  I tried this Class working perfectly hope be useful  File file   ResourceUtils getFile  classpath config sample txt      Read File Content String content   new String Files readAllBytes file toPath      System out println content

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Here is my solution  May help someone    It returns InputStream  but i assume you can read from it too   InputStream is   Thread currentThread   getContextClassLoader   getResourceAsStream  jsonschema json

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After spending a lot of time trying to resolve this issue  finally found a solution that works  The solution makes use of Spring s ResourceUtils  Should work for json files as well   Thanks for the well written page by Lokesh Gupta   Blog    package utils  import org slf4j Logger  import org slf4j LoggerFactory  import org springframework util ResourceUtils   import java io FileInputStream  import java io IOException  import java io InputStream  import java util Properties  import java io File    public class Utils        private static final Logger LOGGER   LoggerFactory getLogger Utils class getName          public static Properties fetchProperties            Properties properties   new Properties            try               File file   ResourceUtils getFile  classpath application properties                InputStream in   new FileInputStream file               properties load in             catch  IOException e                LOGGER error e getMessage                       return properties            To answer a few concerns on the comments    Pretty sure I had this running on Amazon EC2 using java -jar target image-service-slave-1 0-SNAPSHOT jar  Look at my github repo   https   github com johnsanthosh image-service to figure out the right way to run this from a JAR

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create json folder in resources as subfolder then add json file in folder then you can use this code      import com fasterxml jackson core type TypeReference   InputStream is   TypeReference class getResourceAsStream   json fcmgoogletoken json     this works in Docker

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See my answer here  https   stackoverflow com a 56854431 4453282  import org springframework core io Resource  import org springframework core io ResourceLoader    Use these 2 imports   Declare   Autowired ResourceLoader resourceLoader    Use this in some function  Resource resource resourceLoader getResource  classpath preferences json      In your case  as you need the file you may use following  File file   resource getFile    Reference http   frugalisminds com spring load-file-classpath-spring-boot  As already mentioned in previous answers don t use ResourceUtils it doesn t work after deployment of JAR  this will work in IDE as well as after deployment

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i think the problem lies within the space in the folder-name where your project is placed   home user Dev Java Java 20Programs SystemRoutines target classes jsonschema json there is space between Java Programs Renaming the folder name should make it work

[java] Read file from resources folder in Spring Boot

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