Can we run tasks in parallel in single build project

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In the first example your issue is that the logic is running at configuration time (not parallelized) instead of execution time. You’ll need to put that logic in a task action (i.e. method annotation with @TaskAction). Be aware also that tasks with custom actions (i.e. doLast or doFirst) will never be run in parallel.

 Custom actions
 
 Any task that has custom actions (i.e. ones added via {@link org.gradle.api.Task#doLast(org.gradle.api.Action)} or {@link org.gradle.api.Task#doFirst(org.gradle.api.Action)})
 is not considered parallelizable even if its type carries this annotation.
 This is because it cannot be known whether the added action is parallel safe or not.
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