Spring boot fat jar 无法从 application.properties 中定义的绝对路径读取文件

Question

So i have a Spring boot fat jar that has a config that needs to load a .pem file from an absolute path defined in application.properties file.

I defined the path like this:

security.jwt.public-key=/opt/samara/staging.pem

The usage is like this:

    @Value("\${security.jwt.public-key}")
    lateinit var publicKey: Resource

Here is the directory structure:

root@samara:/opt/samara# ls -lsh
-rwxr-xr-x 1 root root  44M Nov 27 07:50 app.jar
-rwxr-xr-x 1 root root 2.0K Nov 27 07:53 staging.pem
-rwxr-xr-x 1 root root 1.2K Nov 27 08:29 application.properties

But when i tried to run it like this:

root@samara:/opt/samara# java -jar app.jar

it failed with this:

Caused by: java.io.FileNotFoundException: Could not open ServletContext resource [/opt/samara/staging.pem]
    at org.springframework.web.context.support.ServletContextResource.getInputStream(ServletContextResource.java:158) ~[spring-web-5.1.8.RELEASE.jar!/:5.1.8.RELEASE]

Actually, i copied those files from another machine and it runs perfectly in that machine but i don't know why it failed in the new machine. Thanks.

Answer 1

After reading this: https://docs.spring.io/spring/docs/current/spring-framework-reference/core.html#resources

I changed the path definition to:

security.jwt.public-key=file:/opt/samara/staging.pem

And it worked!