JHipster Gradle Error in Eclipse - eclipse

I am using Eclipse Mars with Gradle Buildship plugin and trying to import JHipster project and i am getting below error. I searched about this but not found any result.

Related

cannot run junit5 under eclipse (2020-06 (4.16.0))

I can run a junit5 test fine under command line or run as Gradle Test in eclipse; but run it as junit in eclipse it simply failed:
java.lang.NoClassDefFoundError: org/junit/platform/commons/PreconditionViolationException
at
org.eclipse.jdt.internal.junit5.runner.JUnit5TestLoader.createUnfilteredTest(JUnit5TestLoader.java:75)
I see this error in the older eclipse and in the new new eclipse 2020-06 (4.16.0). What am I missing?
Eclipse 2020-06 is using junit jupiter engine v5.6. Your application most likely is using the lower version. Try to change your app dependency to the latest junit jupiter version.

com.gradle.build-scan plugin was not found

I recently started seeing below error in eclipse. seems like eclipse gradle plugin is not able to build the project however when i build from command prompt build is successful.
Plugin [id: 'com.gradle.build-scan', version: '2.1', artifact: 'com.gradle:build-scan-plugin:2.1'] was not found in any of the following sources:
The error is saying that plugin is missing. how do i install this plugin into gradle ?

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Why does Eclipse want to download a previous version of Gradle when I already have a later version installed?

I'm trying to import a project from GitHub to Eclipse. I have Nodeeclipse and Gradle installed. I already have Gradle 2.4 package installed but when I begin to import it, Eclipse starts to download Gradle 2.1 and fails.
How can I make it recognize and use Gradle 2.4?