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License: MIT License
Running the Nxt software: Dependencies: Java 7 or later needs to be installed first. Only the Oracle JVM has been tested and supported. There is no installation needed. Unpack the nxt-client.zip package and open a shell in the resulting nxt directory. Execute the run.sh script if using Linux, or run.bat if using Windows. This will start a java server process, which will begin logging its activities to the console. The initialization takes a few seconds. When it is ready, you should see the message "Nxt server 1.0.0 started successfully". Open a browser, without stopping the java process, and go to http://localhost:7876 , where the Nxt UI should now be available. To stop the application, type Ctrl-C inside the console window. Customization: There are many configuration parameters that could be changed, but the defaults are set so that normally you can run the program immediately after unpacking, without any additional configuration. To see what options are there, open the conf/nxt-default.properties file. All possible settings are listed, with detailed explanation. If you decide to change any setting, do not edit nxt-default.properties directly, but create a new conf/nxt.properties file and only add to it the properties that need to be different from the default values. You do not need to delete the defaults from nxt-default.properties, the settings in nxt.properties override those in nxt-default.properties. This way, when upgrading the software, you can safely overwrite nxt-default.properties with the updated file from the new package, while your customizations remain safe in the nxt.properties file. Technical details: The Nxt software is a client-server application. It consists of a java server process, the one started by the run.sh script, and a javascript user interface run in a browser. To run a node, forge, update the blockchain, interact with peers, only the java process needs to be running, so you could logout and close the browser but keep the java process running. If you want to keep forging, make sure you do not click on "stop forging" when logging out. You can also just close the browser without logging out. The java process communicates with peers on port 7874 tcp by default. If you are behind a router or a firewall and want to have your node accept incoming peer connections, you should setup port forwarding. The server will still work though even if only outgoing connections are allowed, so opening this port is optional. The user interface is available on port 7876. This port also accepts http API requests which other Nxt client applications could use. The blockchain is stored on disk using the H2 embedded database, inside the nxt_db directory. When upgrading, you should not delete the old nxt_db directory, upgrades always include code that can upgrade old database files to the new version whenever needed. But there is no harm if you do delete the nxt_db, except that it will take some extra time to download the blockchain from scratch. The default Nxt client does not store any wallet-type file on disk. Unlike bitcoin, your password is the only thing you need to get access to your account, and is the only piece of data you need to backup or remember. This also means that anybody can get access to your account with only you password - so make sure it is long and random. A weak password will result in your funds being stolen immediately. The java process logs its activities and error messages to the standard output which you see in the console window, but also to a file nxt.log, which gets overwritten at restart. In case of an error, the nxt.log file may contain helpful information, so include its contents when submitting a bug report. In addition to the default user interface at http://localhost:7876 , the following urls are available: http://localhost:7876/update.html - an update checker, which uses information from the blockchain to check for newer versions and let you download them. http://localhost:7876/test - a list of all available http API requests, very useful for client developers and for anyone who wants to execute commands directly using the http interface without going through the browser UI. http://localhost:7876/test?requestType=<specificRequestType> - same as above, but only shows the form for the request type specified. http://localhost:7876/doc - a javadoc documentation for client developers who want to use the Java API directly instead of going through the http interface. http://localhost:7876/admin.html - some more commonly used commands, using the http interface. Compiling: The source is included in the src subdirectory. To compile it on linux, just run the enclosed compile.sh script. This will compile all java classes and package them in an nxt.jar file, replacing the existing one.
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