How do you access a Google Sheet with a service account from Java?

I'm trying to access a Google Sheet from a service account (the service account has access to the sheet). But I have a problem, all the documentation including the official docs point to use GoogleCredential that is deprecated since 1.7. The deprecation says that you sould use library google-auth-library and this is what I'm doing in:

val googleCredentials = ServiceAccountCredentials
      .fromStream(new FileInputStream(CREDENTIALS_FILE_PATH))
      .createScoped(SCOPES)
googleCredentials.refresh()

but the variable is of type GoogleCredentials and the function Sheets.Builder doesn't accept this as a valid HttpRequestInitializer. So I had to hack my way around using the deprecated class with:

val token = googleCredentials.getAccessToken.getTokenValue
val credential = new GoogleCredential().setAccessToken(token)

With this workaround I'm able to access the Google Sheet but I'm sure that there is a proper way to do it without using deprecated libraries.

Does anyone know what's the proper way to do it?

Leaving here the full snippet as a reference.

package drivers
import java.io.FileInputStream
import java.util.Collections

import com.google.api.client.googleapis.auth.oauth2.GoogleCredential
import com.google.api.client.googleapis.javanet.GoogleNetHttpTransport
import com.google.api.client.json.jackson2.JacksonFactory
import com.google.api.services.sheets.v4.{Sheets, SheetsScopes}
import com.google.auth.oauth2.ServiceAccountCredentials
import com.typesafe.config.ConfigFactory

object TestDriver {

  def main(args: Array[String]): Unit = {
    val config = ConfigFactory.load()
    val spreadsheetId = config.getString("spreadsheetId")
    val CREDENTIALS_FILE_PATH = config.getString("google_application_credentials")

    val SCOPES = Collections.singletonList(SheetsScopes.SPREADSHEETS_READONLY)
    val JSON_FACTORY = JacksonFactory.getDefaultInstance
    val APPLICATION_NAME = "my-app"

    val googleCredentials = ServiceAccountCredentials
      .fromStream(new FileInputStream(CREDENTIALS_FILE_PATH))
      .createScoped(SCOPES)
    googleCredentials.refresh()

    val token = googleCredentials.getAccessToken.getTokenValue
    val credential = new GoogleCredential().setAccessToken(token)
    val httpTransport = GoogleNetHttpTransport.newTrustedTransport
    val service = new Sheets.Builder(httpTransport, JSON_FACTORY, credential)
      .setApplicationName(APPLICATION_NAME)
      .build()
    val range = "Sheet1!A1:D1"
    val response = service.spreadsheets().values().get(spreadsheetId, range).execute()
    val values = response.getValues
    values.forEach(println)
  }

• The information is confusing, the Google Auth Library that is recommended to use since the deprecation includes the google-auth-library-oauth2 library
• In other words, you can still use GoogleCredential, and it is still the method recommended in the documentation:

import com.google.api.client.googleapis.auth.oauth2.GoogleCredential;
GoogleCredential credential = GoogleCredential.fromStream(new FileInputStream(CREDENTIALS_FILE_PATH))
.createScoped(Collections.singleton(SCOPES));

• Alternatively, you can also build your credential from a .p12 file:

GoogleCredential credential = new GoogleCredential.Builder()
.setTransport(httpTransport)
.setJsonFactory(JSON_FACTORY)
.setServiceAccountId(emailAddress)
.setServiceAccountPrivateKeyFromP12File(new File("MyProject.p12"))
.setServiceAccountScopes(Collections.singleton(YOUR SCOPE))
.build();

• However, if you do want to use GoogleCredentials and have problems with the HttpRequestInitializer you can use the HttpCredentialsAdapter