WaningMatrix

On the client like imagine you are on an minigame server and you join a game, if it sees player B in game as well it does something otherwise nothing, I want it everytime a user joins a new world.

I want to check if a player is connected to the server or not like if say Player A joins a server and there is another Player B in the game [like in TAB list] and if the player is there do something and if not do nothing. How do I do it? EDIT: this is a repost technically but the last one was for 1.8.9 this time im asking for 1.12

I want to check if a player is connected to the server or not like if say Player A joins a server and there is another Player B in the game [like in TAB list] and if the player is there do something and if not do nothing. How do I do it? Secondary Query: Also if I have a Array list defined in the program and I keep giving it values and restart minecraft, does the ArrayList gets cleared or not? If yes let me know how can I get a ArrayList to be stored permanently which the user can still edit anytime in game simply by using a command. Or give me a forum link or something. Please let me know how do I do this and answer my secondary query as well if you got a answer to it as well.

Sorry for necroposting but I know a lot of people get this error while setting up gradlew setupDecompWorkspace Firstly I'd suggest you to follow ForgeDocs and use intelliJ to create your mods. Follow the whole documentation page and if you still get the " :decompileMC Ran out of Java heapspace " (on step 5 in docs) error. All you have to do is to click on Gradle on the righthandside in intelliJ Idea and click on Gradle settings (gear icon) and set the Gradle VM arguments to -Xmx1400M Check below for pictures explaining the process. Make sure you have at least 2 gigs on RAM allocated to JVM. You can check whether its fine or not by going to Start Menu> Search Configure Java and open it> In the Java tab click on View> Set the Runtime Parameters to -Xmx3G or -Xmx2G based on how much RAM you have on your computer, 2G should be also fine. And now go to intelliJ and in the Local Terminal just type in gradlew setupDecompWorkspace Allow it ~5 to 15 minutes to setup the workspace and you should be good to go! Happy coding!