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To establish a connection with GitLab using the GitLab Java API, you can follow these steps:

1. Add the GitLab Java API dependency to your project using a build tool like Maven or Gradle. For example, to add the GitLab API to a Gradle project, you can add the following to your build.gradle file:

   dependencies {
      implementation 'com.gitlab:java-gitlab-api:5.5.0'
   }
   

2. Create a GitLabAPI object by providing the GitLab server URL and a personal access token or username/password combination for authentication. For example, to create a GitLab API object using a personal access token:

   GitLabApi gitLabApi = new GitLabApi(GitLabApi.ApiVersion.V4, "https://gitlab.example.com", "your_personal_access_token");
   

   Or, to create a GitLab API object using a username and password:

   GitLabApi gitLabApi = new GitLabApi(GitLabApi.ApiVersion.V4, "https://gitlab.example.com", "your_username", "your_password");
   

3. Now that you have a GitLab API object, you can use its methods to interact with GitLab. For example, you can get a list of projects by calling the getProjects() method:

   List<Project> projects = gitLabApi.getProjectApi().getProjects();
   

   Or, you can get information about a specific user by calling the getUser() method:

   User user = gitLabApi.getUserApi().getUser();
   

   You can find more information about the methods available in the GitLab Java API in the official documentation: https://github.com/gmessner/gitlab4j-api#gitlab-4j-java-api-documentation.