<dependency>
  <groupId>org.backlog4j</groupId>
  <artifactId>backlog4j</artifactId>
  <version>1.0.3</version>
</dependency>

'org.backlog4j:backlog4j:1.0.3'

BacklogClient backlogClient = BacklogClientFactory.createBacklogClient("yuorSpaceId", "yourUsername", "yourPassword");

BacklogConfigure configure =
    new BacklogConfigureBuilder()
    .setSpaceId("yuorSpaceId")
    .setUsername("yourUsername")
    .setPassword("yourPassword")
    .buildBacklogConfigure();

BacklogClient backlogClient = new BacklogClientFactory(configure).newBacklogClient();

GetProject getProject = backlogClient.getProject();
getProject.setProjectKey("PROJECT-KEY");

Project project = getProject.execute();