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Hi. Your source set is defined as:

resources {
    srcDirs = ['src/resources']
}

main

is missing.

Well, there is even more unnecessary configuration besides most of the source set configuration. The spring boot dependency management plugin is applied without using it and actually it is imho better to use the builtin BOM support, the

bootJar

gets a classifier configured though it gets disabled, why is the boot plugin applied at all if then the boot jar task is disabled, the classifier of the jar task is configured to its default, the resources already packed into the jar because they are in the source set are again explicitly configured to be packed, for tests first JUnit 4 is configured, then immediately changed to JUnit 5, ...

Thank you @tomas-mrkvicka and @Vampire. I corrected resources configuration. Regarding spring dependency management plugin i removed it. However regarding boot jar plugin i added to generate build info while along with jar file. I removed junit4. All of these i was added because spring internationalisation is not working.

I see, but maybe a bit overkill to apply the boot plugin and then disable its main outcome just for generating a properties file. 😄