dependencies {
    ...
    compile group: 'org.gitlab4j', name: 'gitlab4j-api', version: '4.6.5'
}

// Create a GitLabApi instance to communicate with your GitLab server
GitLabApi gitLabApi = new GitLabApi("http://your.gitlab.server.com", "YOUR_PRIVATE_TOKEN");

// Get the list of projects your account has access to
List<Project> projects = gitLabApi.getProjectApi().getProjects();

// Create a GitLabApi instance to communicate with your GitLab server using GitLab API V3
GitLabApi gitLabApi = new GitLabApi(ApiVersion.V3, "http://your.gitlab.server.com", "YOUR_PRIVATE_TOKEN");

// Get a Pager instance that will page through the projects with 10 projects per page
Pager<Project> projectPager = gitlabApi.getProjectsApi().getProjects(10);

// Iterate through the pages and print out the name and description
while (projectsPager.hasNext())) {
    for (Project project : projectPager.next()) {
        System.out.println(project.getName() + " -: " + project.getDescription());
    }
}

// Create a Pager instance that will be used to build a list containing all the commits for project ID 1234
Pager<Commit> commitPager = gitlabApi.getCommitsApi().getCommits(1234, 20);
List<Commit> allCommits = new ArrayList<>(commitPager.getTotalItems());

// Iterate through the pages and append each page of commits to the list
while (commitPager.hasNext())
    allCommits.addAll(commitPager.next());

// Get a list of commits associated with the specified branch that fall within the specified time window
// This uses the ISO8601 date utilities the in org.gitlab4j.api.utils.ISO8601 class
Date since = ISO8601.toDate("2017-01-01T00:00:00Z");
Date until = new Date(); // now
List<Commit> commits = gitLabApi.getCommitsApi().getCommits(1234, "new-feature", since, until);

// Get a list of DeployKeys for the authenticated user
List<DeployKey> deployKeys = gitLabApi.getDeployKeysApi().getDeployKeys();

// Get a list of Events for the authenticated user
Date after = new Date(0); // After Eposc
Date before = new Date(); // Before now
List<Event> events = gitLabApi.getEventsApi().getAuthenticatedUserEvents(null, null, before, after, DESC);

// Get a list of groups that you have access to
List<Group> groups = gitLabApi.getGroupApi().getGroups();

// Get a list of issues for the specified project ID
List<Issue> issues = gitLabApi.getIssuesApi().getIssues(1234);

// Get a list of jobs for the specified project ID
List<Job> jobs = gitLabApi.getJobApi().getJobs(1234);

// Get a list of the merge requests for the specified project
List<MergeRequest> mergeRequests = gitLabApi.getMergeRequestApi().getMergeRequests(1234);

// Get all namespaces that match "foobar" in their name or path
List<Namespace> namespaces = gitLabApi.getNamespaceApi().findNamespaces("foobar");

// Get a list of the issues's notes for project ID 1234, issue ID 1
List<Note> notes = getNotes(Integer 1234, Integer 1);

// Get all pipelines for the specified project ID
List<Pipeline> pipelines = gitLabApi.getPipelineApi().getPipelines(1234);

// Get a list of accessible projects 
public List<Project> projects = gitLabApi.getProjectApi().getProjects();

// Create a new project
Project projectSpec = new Project()
    .withName("my-project")
    .withDescription("My project for demonstration.")
    .withIssuesEnabled(true)
    .withMergeRequestsEnabled(true)
    .withWikiEnabled(true)
    .withSnippetsEnabled(true)
    .withPublic(true);

Project newProject = gitLabApi.getProjectApi().createProject(projectSpec);

// Get a list of repository branches from a project, sorted by name alphabetically
List<Branch> branches = gitLabApi.getRepositoryApi().getBranches();

// Get info (name, size, ...) and the content from a file in repository
RepositoryFile file = gitLabApi.getRepositoryFileApi().getFile("file-path", 1234, "ref");   

// Activates the gitlab-ci service.
getLabApi.getServicesApi().setGitLabCI("project-name", "auth-token", "project-ci-url");

// Log in to the GitLab server and get the session info
getLabApi.getSessionApi().login("your-username", "your-email", "your-password");

// Get the User info for user_id 1
User user = gitLabApi.getUserApi().getUser(1);