Why it downloads Gradle when I open a single java file

The issue is found when I'm using a VM without network access. It's a clean installed Windows, OpenJDK 8u202, VS Code 1.33.1, vscode-java is the only extension installed.

When I open a .java file, vscode activates the extension, and there's an error in the log. Attaching the full log: vscode-java-no-network.log

Why does it have to download the Gradle when I'm not opening a gradle project? IMO it would be good if the downloading only happens when I'm working on a gradle project.

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!ENTRY org.eclipse.buildship.core 2 0 2019-04-25 13:08:11.621
!MESSAGE Could not load Gradle version information
!STACK 0
org.gradle.api.UncheckedIOException: Cannot download published Gradle versions.
	at org.eclipse.buildship.core.internal.util.gradle.PublishedGradleVersions.downloadVersionInformation(PublishedGradleVersions.java:164)
	at org.eclipse.buildship.core.internal.util.gradle.PublishedGradleVersions.tryToDownloadAndCacheVersions(PublishedGradleVersions.java:148)
	at org.eclipse.buildship.core.internal.util.gradle.PublishedGradleVersions.create(PublishedGradleVersions.java:108)
	at org.eclipse.buildship.core.internal.util.gradle.PublishedGradleVersionsWrapper$LoadVersionsJob.run(PublishedGradleVersionsWrapper.java:62)
	at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63)
Caused by: java.net.UnknownHostException: services.gradle.org
	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:184)
	at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:172)
	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
	at java.net.Socket.connect(Socket.java:589)
	at sun.security.ssl.SSLSocketImpl.connect(SSLSocketImpl.java:666)
	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
	at sun.net.www.protocol.https.HttpsClient.<init>(HttpsClient.java:264)
	at sun.net.www.protocol.https.HttpsClient.New(HttpsClient.java:367)
	at sun.net.www.protocol.https.AbstractDelegateHttpsURLConnection.getNewHttpClient(AbstractDelegateHttpsURLConnection.java:191)
	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
	at sun.net.www.protocol.https.AbstractDelegateHttpsURLConnection.connect(AbstractDelegateHttpsURLConnection.java:177)
	at sun.net.www.protocol.http.HttpURLConnection.getInputStream0(HttpURLConnection.java:1564)
	at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1492)
	at sun.net.www.protocol.https.HttpsURLConnectionImpl.getInputStream(HttpsURLConnectionImpl.java:263)
	at org.eclipse.buildship.core.internal.util.gradle.PublishedGradleVersions.downloadVersionInformation(PublishedGradleVersions.java:161)
	... 4 more

!ENTRY org.eclipse.jdt.ls.core 1 0 2019-04-25 13:08:12.170
!MESSAGE Finished creating the Java project jdt.ls-java-project

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