bootRepackage was renamed to bootJar in modern Spring Boot Gradle plugin.
--- a/.bash_completion.d/gradle Wed Aug 22 15:44:28 2018 +0300
+++ b/.bash_completion.d/gradle Tue Sep 04 19:54:29 2018 +0300
@@ -30,7 +30,7 @@
local _tasks_full='help - Displays a help message.
wrapper - Create ./gradlew.
assemble - Assembles the outputs of this project.
-bootRepackage - Repackage existing JAR and WAR archives so that they can be executed from the command line.
+bootJar - Assembles an executable jar archive containing the main classes and their dependencies.
build - Assembles and tests this project.
buildDependents - Assembles and tests this project and all projects that depend on it.
buildNeeded - Assembles and tests this project and all projects it depends on.