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How to override Java resources when you run Spring Boot fat-jar?

I've created a Spring Boot far-jar that contains inside as resource a log4j.xml configuration file. Now when I run the fat-jar I'm trying to override it in this way

$ java -cp conf/ -jar target/myapp.jar

and I've put in the conf/ folder a new log4j.xml. But nothing, it continues to use the resource inside the jar.

dash1e
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1 Answers1

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If your goal is only to define your own log4j.xml configuration file, this could help:

java -Dlogging.config='/path/to/log4j2.xml' -jar target/myapp.jar

(this was mentioned already in How can I change the default location of log4j2.xml in Java Spring Boot? )

If you just want to add resources by classpath addition you could refer to https://docs.spring.io/spring-boot/docs/current/reference/html/appendix-executable-jar-format.html#executable-jar-property-launcher-features where I found loader.path :

loader.path can contain directories (which are scanned recursively for jar and zip files), archive paths, a directory within an archive that is scanned for jar files (for example, dependencies.jar!/lib), or wildcard patterns (for the default JVM behavior). Archive paths can be relative to loader.home or anywhere in the file system with a jar:file: prefix.

de-jcup
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  • And if my base `log4j2.xml` include other configuration fragments? For example I have a specific fragments only for loggers, and I would like to override it only. – dash1e May 12 '21 at 05:36
  • While reading https://stackoverflow.com/a/38408283/2590615 and the referenced links, I think you just have to add multiple parts comma separated. See https://github.com/kamalcph/Log4j2Examples/blob/0f460784140a2a2ccb831adafdc58659079e923f/src/main/java/in/co/nmsworks/log4j2/examples/CompositeConfigurationExample.java#L31 – de-jcup May 16 '21 at 21:06