I recently migrated my project to Java 17 and Spring Boot 2.5.7. After the migration, I'm encountering an issue where a JSON file located in my resources folder isn't being read correctly when running on Tomcat (WAR file deployment) in the testing environment. The same code works fine locally.

File Path:

pubs/src/main/resources/db.mongo.query/FORM16.json

Code:

String query = new String(
    Files.readAllBytes(Paths.get(new ClassPathResource("db.mongo.query/" + this.name + ".json").getURI()))
);

Problem:

The file is located in the resources folder, but when the application is deployed on Tomcat (testing environment), I get an error when attempting to read the file. The code works correctly when running the application locally. I have confirmed that the Tomcat user has read permissions for the file. I have checked for a different file and it works as expected

Has anyone encountered this issue after migrating to Java 17 and Spring Boot 2.5.7? Any suggestions on how to resolve this?

I recently migrated my project to Java 17 and Spring Boot 2.5.7. After the migration, I'm encountering an issue where a JSON file located in my resources folder isn't being read correctly when running on Tomcat (WAR file deployment) in the testing environment. The same code works fine locally.

File Path:

pubs/src/main/resources/db.mongo.query/FORM16.json

Code:

String query = new String(
    Files.readAllBytes(Paths.get(new ClassPathResource("db.mongo.query/" + this.name + ".json").getURI()))
);

Problem:

The file is located in the resources folder, but when the application is deployed on Tomcat (testing environment), I get an error when attempting to read the file. The code works correctly when running the application locally. I have confirmed that the Tomcat user has read permissions for the file. I have checked for a different file and it works as expected

Has anyone encountered this issue after migrating to Java 17 and Spring Boot 2.5.7? Any suggestions on how to resolve this?

• java
• spring-boot
• migration

• Are the files db.mongo.query/* in the build war file? Rename the file from .war to .zip and look inside. They should be at /WEB-INF/classes/db.mongo.query/*. If not then you have a build issue. Pease add your pom/gradle file and build command. – John Williams Commented Mar 18 at 15:43

2 Answers 2

Instead of converting the class path resource to a file system path, open an input stream, and read from the input stream:

String query = StreamUtils.copyToString(
        new ClassPathResource("db.mongo.query/" + this.name + ".json").getInputStream(),
        StandardCharsets.UTF_8);

The below way is working

URL queryURL = getClass().getClassLoader().getResource("db.mongo.query/" + this.name + ".json");
String query = new String(Files.readAllBytes(Paths.get(queryURL.toURI())));