How to download and setup java-slack-sdk
Open terminal and run command
                                            git clone https://github.com/slackapi/java-slack-sdk.git
                                        
                                        git clone is used to create a copy or clone of java-slack-sdk repositories.
                                        You pass git clone a repository URL. it supports a few different network protocols and corresponding URL formats.
Also you may download zip file with java-slack-sdk https://github.com/slackapi/java-slack-sdk/archive/master.zip
Or simply clone java-slack-sdk with SSH
                                            [email protected]:slackapi/java-slack-sdk.git                                    
                                    If you have some problems with java-slack-sdk
You may open issue on java-slack-sdk support forum (system) here: https://github.com/slackapi/java-slack-sdk/issuesSimilar to java-slack-sdk repositories
Here you may see java-slack-sdk alternatives and analogs
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