Tools you need:
- IntelliJ IDEA Community Edition
Make sure using Java SDK 1.8.
To change monster respawn you can find something like this in MonsterAI:
this.world.scheduleTask(new MonsterRespawn(this.world, this), 20L, TimeUnit.SECONDS);
just change the 20L.
If you want to implement trade it’s hard to make from scratch because you need implement it from Emulator and Client Side, but i suggest download recent AQW PS files source Client, Emu, and Database and you can copy from that.