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link to build-scan: <https://scans.gradle.com/s/oexvsmcnmyz6m/console-log?anchor=17069>

Besides that you should not start every build with "clean" (that was necessary with Maven builds as the are unreliable and non-reproducible), it is hard to guess without seeing your build scripts.

build.gradle

That's only a part of the picture.
There are various included script plugins.
Best would be if you can knit an MCVE (<https://stackoverflow.com/help/mcve>)

Btw. `assert System.properties["java.specification.version"] == "1.8" || "11" || "12" || "13"` will *always* be `true`.
You basically wrote `assert System.properties["java.specification.version"] == "1.8" || true || true || true`

can you pls suggest me the correct block of code here? Because I am confused with the above basically block.. What should have been the correct block of code here? help me understand..

What you have is in prose:

assert that
either `java.specification.version` is equal to `"1.8"`
or `"11"` is `true`
or `"12"` is `true`
or `"13"` is `true`

And according to Groovy truth rules, the last three are always `true`.

Actually, if you want a certain version for building your project,
I'd recommend you use the JVM Toolchains feature instead, so the Java version to
run Gradle is decoupled from the Java version used to build and run your code.

<https://docs.gradle.org/current/userguide/toolchains.html>