che: LS not working for Java Maven

Describe the bug

The LS is not working for a Java Maven workspace. It seems like LS is initialized but then it does not work: error highlighting, suggestions neither the ctrl + left click to open class in new tab.

Che version

• latest
• nightly
• other: please specify

Steps to reproduce

1. Go to Workspaces -> Create Workspace -> Java Maven
2. Create and open workspace with default settings
3. Open file HelloWorld.java in console-java-simple/src/main/java/org/eclipse/che/examples
4. Wait for LS to be initialized [1]
5. Try to use error highlighting, suggestion invoking or Ctrl + left click (none of them should work)
6. Open Problems: View -> Problems
7. See the following error:

{
	"resource": "file:///projects/console-java-simple",
	"owner": "file:///projects/console-java-simple",
	"code": "0",
	"severity": 1,
	"message": "Could not fetch model of type 'BuildEnvironment' using Gradle distribution 'https://services.gradle.org/distributions-snapshots/gradle-6.0-20191016123526+0000-bin.zip'.\nThe specified Gradle distribution 'https://services.gradle.org/distributions-snapshots/gradle-6.0-20191016123526+0000-bin.zip' does not exist.\nhttps://downloads.gradle-dn.com/distributions-snapshots/gradle-6.0-20191016123526+0000-bin.zip",
	"source": "Java",
	"startLineNumber": 0,
	"startColumn": 0,
	"endLineNumber": 0,
	"endColumn": 0
}

[1]

Expected behavior

The LS should be correctly initialized or some error should be shown for a user.

Runtime

• kubernetes (include output of kubectl version)
• Openshift (include output of oc version) oc v3.11.0+0cbc58b kubernetes v1.11.0+d4cacc0 features: Basic-Auth GSSAPI Kerberos SPNEGO

Server https://api.ocp42.codereadyqe.com:6443 kubernetes v1.14.6+8bbaf43

• minikube (include output of minikube version and kubectl version)
• minishift (include output of minishift version and oc version)
• docker-desktop + K8S (include output of docker version and kubectl version)
• other: (please specify)

Screenshots

Installation method

• chectl chectl server:start -a operator -p openshift -b crw.codeready.com -n katka
• che-operator
• minishift-addon
• I don’t know

Environment

• my computer
  • Windows
  • Linux
  • macOS
• Cloud
  • Amazon
  • Azure
  • GCE
  • other (please specify)
• other: please specify