Java quickstart

    Create a Java command-line application that makes requests to the Google Meet API.

    Quickstarts explain how to set up and run an app that calls a Google Workspace API. This quickstart uses a simplified authentication approach that is appropriate for a testing environment. For a production environment, we recommend learning about authentication and authorization before choosing the access credentials that are appropriate for your app.

    This quickstart uses Google Workspace's recommended API client libraries to handle some details of the authentication and authorization flow.

    Objectives

    • Set up your environment.
    • Set up the sample.
    • Run the sample.

    Prerequisites

    • A Google Workspace account with Google Meet enabled.

    Set up your environment

    To complete this quickstart, set up your environment.

    Enable the API

    Before using Google APIs, you need to turn them on in a Google Cloud project. You can turn on one or more APIs in a single Google Cloud project.

    • In the Google Cloud console, enable the Google Meet API.

      Enable the API

    If you're using a new Google Cloud project to complete this quickstart, configure the OAuth consent screen. If you've already completed this step for your Cloud project, skip to the next section.

    1. In the Google Cloud console, go to Menu > Google Auth platform > Branding .

      Go to Branding

    2. If you have already configured the Google Auth platform, you can configure the following OAuth Consent Screen settings in Branding , Audience , and Data Access . If you see a message that says Google Auth platform not configured yet , click Get Started :
      1. Under App Information , in App name , enter a name for the app.
      2. In User support email , choose a support email address where users can contact you if they have questions about their consent.
      3. Click Next .
      4. Under Audience , select Internal .
      5. Click Next .
      6. Under Contact Information , enter an Email address where you can be notified about any changes to your project.
      7. Click Next .
      8. Under Finish , review the Google API Services User Data Policy and if you agree, select I agree to the Google API Services: User Data Policy .
      9. Click Continue .
      10. Click Create .
    3. For now, you can skip adding scopes. In the future, when you create an app for use outside of your Google Workspace organization, you must change the User type to External . Then add the authorization scopes that your app requires. To learn more, see the full Configure OAuth consent guide.

    Authorize credentials for a desktop application

    To authenticate end users and access user data in your app, you need to create one or more OAuth 2.0 Client IDs. A client ID is used to identify a single app to Google's OAuth servers. If your app runs on multiple platforms, you must create a separate client ID for each platform.
    1. In the Google Cloud console, go to Menu > Google Auth platform > Clients .

      Go to Clients

    2. Click Create Client .
    3. Click Application type > Desktop app .
    4. In the Name field, type a name for the credential. This name is only shown in the Google Cloud console.
    5. Click Create .

      The newly created credential appears under "OAuth 2.0 Client IDs."

    6. Save the downloaded JSON file as credentials.json , and move the file to your working directory.

    Prepare the workspace

    1. In your working directory, create a new project structure:

       gradle init --type basic
mkdir -p src/main/java src/main/resources

    2. In the src/main/resources/ directory, copy the credentials.json file that you previously downloaded.

    3. Open the default build.gradle file and replace its contents with the following code:

      meet/quickstart/build.gradle
       apply 
  
 plugin: 
  
 'java' 
 apply 
  
 plugin: 
  
 'application' 
 mainClassName 
  
 = 
  
 'MeetQuickstart' 
 sourceCompatibility 
  
 = 
  
 11 
 targetCompatibility 
  
 = 
  
 11 
 version 
  
 = 
  
 '1.0' 
 repositories 
  
 { 
  
 mavenCentral 
 () 
 } 
 dependencies 
  
 { 
  
 implementation 
  
 'com.google.cloud:google-cloud-meet:0.3.0' 
  
 implementation 
  
 'com.google.auth:google-auth-library-oauth2-http:1.19.0' 
  
 implementation 
  
 'com.google.oauth-client:google-oauth-client-jetty:1.34.1' 
 }

    Set up the sample

    1. In the src/main/java/ directory, create a new Java file with a name that matches the mainClassName value in your build.gradle file.

    2. Include the following code in your new Java file:

      meet/quickstart/src/main/java/MeetQuickstart.java
       import 
  
 java.awt.Desktop 
 ; 
 import 
  
 java.io.FileNotFoundException 
 ; 
 import 
  
 java.io.IOException 
 ; 
 import 
  
 java.io.InputStream 
 ; 
 import 
  
 java.net.URI 
 ; 
 import 
  
 java.net.URL 
 ; 
 import 
  
 java.nio.file.Files 
 ; 
 import 
  
 java.nio.file.Path 
 ; 
 import 
  
 java.nio.file.Paths 
 ; 
 import 
  
 java.util.Collections 
 ; 
 import 
  
 java.util.List 
 ; 
 import 
  
 com.google.api.client.extensions.jetty.auth.oauth2.LocalServerReceiver 
 ; 
 import 
  
 com.google.api.gax.core.FixedCredentialsProvider 
 ; 
 import 
  
 com.google.apps.meet.v2.CreateSpaceRequest 
 ; 
 import 
  
 com.google.apps.meet.v2.Space 
 ; 
 import 
  
 com.google.apps.meet.v2.SpacesServiceClient 
 ; 
 import 
  
 com.google.apps.meet.v2.SpacesServiceSettings 
 ; 
 import 
  
 com.google.auth.Credentials 
 ; 
 import 
  
 com.google.auth.oauth2.ClientId 
 ; 
 import 
  
 com.google.auth.oauth2.DefaultPKCEProvider 
 ; 
 import 
  
 com.google.auth.oauth2.TokenStore 
 ; 
 import 
  
 com.google.auth.oauth2.UserAuthorizer 
 ; 
 /* class to demonstrate use of Drive files list API */ 
 public 
  
 class 
 MeetQuickstart 
  
 { 
  
 /** 
 * Directory to store authorization tokens for this application. 
 */ 
  
 private 
  
 static 
  
 final 
  
 String 
  
 TOKENS_DIRECTORY_PATH 
  
 = 
  
 "tokens" 
 ; 
  
 /** 
 * Global instance of the scopes required by this quickstart. 
 * If modifying these scopes, delete your previously saved tokens/ folder. 
 */ 
  
 private 
  
 static 
  
 final 
  
 List<String> 
  
 SCOPES 
  
 = 
  
 Collections 
  
 . 
 singletonList 
 ( 
 "https://www.googleapis.com/auth/meetings.space.created" 
 ); 
  
 private 
  
 static 
  
 final 
  
 String 
  
 CREDENTIALS_FILE_PATH 
  
 = 
  
 "/credentials.json" 
 ; 
  
 private 
  
 static 
  
 final 
  
 String 
  
 USER 
  
 = 
  
 "default" 
 ; 
  
 // Simple file-based token storage for storing oauth tokens 
  
 private 
  
 static 
  
 final 
  
 TokenStore 
  
 TOKEN_STORE 
  
 = 
  
 new 
  
 TokenStore 
 () 
  
 { 
  
 private 
  
 Path 
  
 pathFor 
 ( 
 String 
  
 id 
 ) 
  
 { 
  
 return 
  
 Paths 
 . 
 get 
 ( 
 "." 
 , 
  
 TOKENS_DIRECTORY_PATH 
 , 
  
 id 
  
 + 
  
 ".json" 
 ); 
  
 } 
  
 @Override 
  
 public 
  
 String 
  
 load 
 ( 
 String 
  
 id 
 ) 
  
 throws 
  
 IOException 
  
 { 
  
 if 
  
 ( 
 ! 
 Files 
 . 
 exists 
 ( 
 pathFor 
 ( 
 id 
 ))) 
  
 { 
  
 return 
  
 null 
 ; 
  
 } 
  
 return 
  
 Files 
 . 
 readString 
 ( 
 pathFor 
 ( 
 id 
 )); 
  
 } 
  
 @Override 
  
 public 
  
 void 
  
 store 
 ( 
 String 
  
 id 
 , 
  
 String 
  
 token 
 ) 
  
 throws 
  
 IOException 
  
 { 
  
 Files 
 . 
 createDirectories 
 ( 
 Paths 
 . 
 get 
 ( 
 "." 
 , 
  
 TOKENS_DIRECTORY_PATH 
 )); 
  
 Files 
 . 
 writeString 
 ( 
 pathFor 
 ( 
 id 
 ), 
  
 token 
 ); 
  
 } 
  
 @Override 
  
 public 
  
 void 
  
 delete 
 ( 
 String 
  
 id 
 ) 
  
 throws 
  
 IOException 
  
 { 
  
 if 
  
 ( 
 ! 
 Files 
 . 
 exists 
 ( 
 pathFor 
 ( 
 id 
 ))) 
  
 { 
  
 return 
 ; 
  
 } 
  
 Files 
 . 
 delete 
 ( 
 pathFor 
 ( 
 id 
 )); 
  
 } 
  
 }; 
  
 /** 
 * Initialize a UserAuthorizer for local authorization. 
 * 
 * @param callbackUri 
 * @return 
 */ 
  
 private 
  
 static 
  
 UserAuthorizer 
  
 getAuthorizer 
 ( 
 URI 
  
 callbackUri 
 ) 
  
 throws 
  
 IOException 
  
 { 
  
 // Load client secrets. 
  
 try 
  
 ( 
 InputStream 
  
 in 
  
 = 
  
 MeetQuickstart 
 . 
 class 
 . 
 getResourceAsStream 
 ( 
 CREDENTIALS_FILE_PATH 
 )) 
  
 { 
  
 if 
  
 ( 
 in 
  
 == 
  
 null 
 ) 
  
 { 
  
 throw 
  
 new 
  
 FileNotFoundException 
 ( 
 "Resource not found: " 
  
 + 
  
 CREDENTIALS_FILE_PATH 
 ); 
  
 } 
  
 ClientId 
  
 clientId 
  
 = 
  
 ClientId 
 . 
 fromStream 
 ( 
 in 
 ); 
  
 UserAuthorizer 
  
 authorizer 
  
 = 
  
 UserAuthorizer 
 . 
 newBuilder 
 () 
  
 . 
 setClientId 
 ( 
 clientId 
 ) 
  
 . 
 setCallbackUri 
 ( 
 callbackUri 
 ) 
  
 . 
 setScopes 
 ( 
 SCOPES 
 ) 
  
 . 
 setPKCEProvider 
 ( 
 new 
  
 DefaultPKCEProvider 
 () 
  
 { 
  
 // Temporary fix for https://github.com/googleapis/google-auth-library-java/issues/1373 
  
 @Override 
  
 public 
  
 String 
  
 getCodeChallenge 
 () 
  
 { 
  
 return 
  
 super 
 . 
 getCodeChallenge 
 (). 
 split 
 ( 
 "=" 
 ) 
 [ 
 0 
 ] 
 ; 
  
 } 
  
 }) 
  
 . 
 setTokenStore 
 ( 
 TOKEN_STORE 
 ). 
 build 
 (); 
  
 return 
  
 authorizer 
 ; 
  
 } 
  
 } 
  
 /** 
 * Run the OAuth2 flow for local/installed app. 
 * 
 * @return An authorized Credential object. 
 * @throws IOException If the credentials.json file cannot be found. 
 */ 
  
 private 
  
 static 
  
 Credentials 
  
 getCredentials 
 () 
  
 throws 
  
 Exception 
  
 { 
  
 LocalServerReceiver 
  
 receiver 
  
 = 
  
 new 
  
 LocalServerReceiver 
 . 
 Builder 
 (). 
 build 
 (); 
  
 try 
  
 { 
  
 URI 
  
 callbackUri 
  
 = 
  
 URI 
 . 
 create 
 ( 
 receiver 
 . 
 getRedirectUri 
 ()); 
  
 UserAuthorizer 
  
 authorizer 
  
 = 
  
 getAuthorizer 
 ( 
 callbackUri 
 ); 
  
 Credentials 
  
 credentials 
  
 = 
  
 authorizer 
 . 
 getCredentials 
 ( 
 USER 
 ); 
  
 if 
  
 ( 
 credentials 
  
 != 
  
 null 
 ) 
  
 { 
  
 return 
  
 credentials 
 ; 
  
 } 
  
 URL 
  
 authorizationUrl 
  
 = 
  
 authorizer 
 . 
 getAuthorizationUrl 
 ( 
 USER 
 , 
  
 "" 
 , 
  
 null 
 ); 
  
 if 
  
 ( 
 Desktop 
 . 
 isDesktopSupported 
 () 
 && 
  
 Desktop 
 . 
 getDesktop 
 (). 
 isSupported 
 ( 
 Desktop 
 . 
 Action 
 . 
 BROWSE 
 )) 
  
 { 
  
 Desktop 
 . 
 getDesktop 
 (). 
 browse 
 ( 
 authorizationUrl 
 . 
 toURI 
 ()); 
  
 } 
  
 else 
  
 { 
  
 System 
 . 
 out 
 . 
 printf 
 ( 
 "Open the following URL to authorize access: %s\n" 
 , 
  
 authorizationUrl 
 . 
 toExternalForm 
 ()); 
  
 } 
  
 String 
  
 code 
  
 = 
  
 receiver 
 . 
 waitForCode 
 (); 
  
 credentials 
  
 = 
  
 authorizer 
 . 
 getAndStoreCredentialsFromCode 
 ( 
 USER 
 , 
  
 code 
 , 
  
 callbackUri 
 ); 
  
 return 
  
 credentials 
 ; 
  
 } 
  
 finally 
  
 { 
  
 receiver 
 . 
 stop 
 (); 
  
 } 
  
 } 
  
 public 
  
 static 
  
 void 
  
 main 
 ( 
 String 
 ... 
  
 args 
 ) 
  
 throws 
  
 Exception 
  
 { 
  
 // Override default service settings to supply user credentials. 
  
 Credentials 
  
 credentials 
  
 = 
  
 getCredentials 
 (); 
  
 SpacesServiceSettings 
  
 settings 
  
 = 
  
 SpacesServiceSettings 
 . 
 newBuilder 
 () 
  
 . 
 setCredentialsProvider 
 ( 
 FixedCredentialsProvider 
 . 
 create 
 ( 
 credentials 
 )) 
  
 . 
 build 
 (); 
  
 try 
  
 ( 
 SpacesServiceClient 
  
 spacesServiceClient 
  
 = 
  
 SpacesServiceClient 
 . 
 create 
 ( 
 settings 
 )) 
  
 { 
  
 CreateSpaceRequest 
  
 request 
  
 = 
  
 CreateSpaceRequest 
 . 
 newBuilder 
 () 
  
 . 
 setSpace 
 ( 
 Space 
 . 
 newBuilder 
 (). 
 build 
 ()) 
  
 . 
 build 
 (); 
  
 Space 
  
 response 
  
 = 
  
 spacesServiceClient 
 . 
 createSpace 
 ( 
 request 
 ); 
  
 System 
 . 
 out 
 . 
 printf 
 ( 
 "Space created: %s\n" 
 , 
  
 response 
 . 
 getMeetingUri 
 ()); 
  
 } 
  
 catch 
  
 ( 
 IOException 
  
 e 
 ) 
  
 { 
  
 // TODO(developer): Handle errors 
  
 e 
 . 
 printStackTrace 
 (); 
  
 } 
  
 } 
 }

    Run the sample

    1. Run the sample:

      gradle run
    1. The first time you run the sample, it prompts you to authorize access:
      1. If you're not already signed in to your Google Account, sign in when prompted. If you're signed in to multiple accounts, select one account to use for authorization.
      2. Click Accept.

      Your Java application runs and calls the Google Meet API.

      Authorization information is stored in the file system, so the next time you run the sample code, you aren't prompted for authorization.

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