I don't know if this is an error many other people are having, but I have been trying to learn how to code Minecraft mods using Java Eclipse from a book I purchased, and I recently finished the section that involves making new blocks, items, and textures for said blocks and items. I've followed what the book said, and tried to run the client only to have it crash with the error ("AL lib: (EE) alc_cleanup: 1 device not closed
Java HotSpot(TM) 64-Bit Server VM warning: Using incremental CMS is deprecated and will likely be removed in a future release") at the 7/7 stage on the loading screen. I have also had to reinstall the whole modding setup that allowed everything to work before, including the relevant Java versions that allowed Java Eclipse to work because of an error that would not let Eclipse open, caused by some of the older java versions being deleted. After I got everything working with Eclipse again, I copied the "src" file in the forge folder were the mods being worked on were stored to the new forge directory and everything seemed to be working well, until I tried to run the client. I was also using Java Eclipse Neon before and I am now using Java Eclipse Oxygen now (provided that helps at all). I am mainly asking here, because I have tried to troubleshoot the issue myself by looking up the error, but with no success. I would be very happy if anyone knows what the issue is and how to fix it. I'm sorry if I did a bad job of explaining anything.
Here is the console output in Eclipse.