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repositories {
    // Use Maven Central for resolving dependencies.
    mavenCentral()
    // Add sonatype repository
    maven { 
        url 'https://oss.sonatype.org/content/repositories/snapshots/'
    } 
}

dependencies {

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final String[] scopes = new String[] {"Mail.Read", "Mail.Send", "User.Read"};
final String[] allowedHosts = new String[] {"graph.microsoft.com"};

DeviceCodeCredential deviceCodeCredential = new DeviceCodeCredentialBuilder()
    .clientId(appId)
    .tenantId(tenantId)
    .challengeConsumer(challenge -> {
        System.out.println(challenge.getMessage());
    })
    .build();

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DeviceCodeCredential deviceCodeCredential = new DeviceCodeCredentialBuilder()
    .clientId(clientId)
    .tenantId(tenantId)
    .challengeConsumer(challenge -> System.out.println(challenge.getMessage()))
    .build();

//create a client for calling v1.0 endpoint
com.microsoft.graph.serviceclient.GraphServiceClient graphClient = 
    new com.microsoft.graph.serviceclient.GraphServiceClient(
        deviceCodeCredential,

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//Use adjusted pageIterator sample from above to get list of first 100 messageIds. 
MessageCollectionResponse messages = graphClient
  .me()
  .messages()
  .get(); 
 
List<String> messagesIdList = new LinkedList<String>(); 
PageIterator pageIterator = new PageIterator.Builder<Message, MessageCollectionResponse>() 
        .client(graphClient) 
        .collectionPage(messages) 

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// get the object 
Event event = graphClient
    .me()
    .events() 
    .byEventId("event-id") 
    .get(); 

// the backing store will keep track that the property change and send the updated value. 
event.setRecurrence(null); // set to null  

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User user = new User();
user.setDisplayName("displayName");
user.setMail("[email protected]");

graphClient
  .users()
  .post(user); 

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User user = new User();  
user.displayName = "displayName";   
user.userPrincipalName = "[email protected]";  

graphClient
  .users()
  .buildRequest()
  .post(user); 

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int memberCount = graphClient
    .groups()
    .byGroupId("Id")
    .members()
    .graphUser()
    .count() //Where applicable to enable the use of $count
    .get(requestConfiguration -> { 
        requestConfiguration.headers.add("ConsistencyLevel", "Eventual");
});

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UserCollectionResponse response = graphClient
    .groups()
    .byGroupId("Id")
    .members()
    .graphUser()
    .get( requestConfiguration -> { 
        requestConfiguration.headers.add("ConsistencyLevel", "Eventual"); 
        requestConfiguration.queryParameters.top = 10; 
});

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//Fetching the members of a group who are of the type User 
//graph.microsoft.com/v1.0/groups/{group-id}/members/microsoft.graph.user 
UserCollectionResponse usersInGroup = graphClient
    .groups()
    .byGroupId("group-id")
    .members()
    .graphUser()
    .get();

List<User> users = usersInGroup.getValue();