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no i dont wanna make a mod i just want to mess with the games code to see what funny stuff i can do

First when i run it in debug mode nothing happens and when i press resume i get this Exception in thread "Client thread" [23:46:08] [Client thread/INFO]: [STDERR]: java.lang.Error: Unresolved compilation problem: Type mismatch: cannot convert from List<Object> to List<T> [23:46:08] [Client thread/INFO]: [STDERR]: at net.minecraft.util.math.Cartesian$GetList.apply(Cartesian.java:57) [23:46:08] [Client thread/INFO]: [STDERR]: at net.minecraft.util.math.Cartesian$GetList.apply(Cartesian.java:1) [23:46:08] [Client thread/INFO]: [STDERR]: at com.google.common.collect.Iterators$7.transform(Iterators.java:750) [23:46:08] [Client thread/INFO]: [STDERR]: at com.google.common.collect.TransformedIterator.next(TransformedIterator.java:47) [23:46:08] [Client thread/INFO]: [STDERR]: at net.minecraft.block.state.BlockStateContainer.<init>(BlockStateContainer.java:73) [23:46:08] [Client thread/INFO]: [STDERR]: at net.minecraft.block.Block.createBlockState(Block.java:1113) [23:46:08] [Client thread/INFO]: [STDERR]: at net.minecraft.block.Block.<init>(Block.java:305) [23:46:08] [Client thread/INFO]: [STDERR]: at net.minecraft.block.Block.<init>(Block.java:314) [23:46:08] [Client thread/INFO]: [STDERR]: at net.minecraft.block.BlockAir.<init>(BlockAir.java:18) [23:46:08] [Client thread/INFO]: [STDERR]: at net.minecraft.block.Block.registerBlocks(Block.java:1171) [23:46:08] [Client thread/INFO]: [STDERR]: at net.minecraft.init.Bootstrap.register(Bootstrap.java:500) [23:46:08] [Client thread/INFO]: [STDERR]: at net.minecraft.client.Minecraft.<init>(Minecraft.java:439) [23:46:08] [Client thread/INFO]: [STDERR]: at net.minecraft.client.main.Main.main(Main.java:115) [23:46:08] [Client thread/INFO]: [STDERR]: at Start.main(Start.java:11) Java HotSpot(TM) 64-Bit Server VM warning: Using incremental CMS is deprecated and will likely be removed in a future release

Hi i am trying to use eclipse cause i want to mess with minecraft's code and i wanna see what i can do but minecraft isnt launching it just says [14:07:11] [Client thread/INFO]: Setting user: Player447 and then nothing happens