How to download and setup dnsjava
Open terminal and run command
                                            git clone https://github.com/dnsjava/dnsjava.git
                                        
                                        git clone is used to create a copy or clone of dnsjava 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 dnsjava https://github.com/dnsjava/dnsjava/archive/master.zip
Or simply clone dnsjava with SSH
                                            [email protected]:dnsjava/dnsjava.git                                    
                                    If you have some problems with dnsjava
You may open issue on dnsjava support forum (system) here: https://github.com/dnsjava/dnsjava/issuesSimilar to dnsjava repositories
Here you may see dnsjava alternatives and analogs
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