I dont need Enivroment cause its a Bug in Minecraft.
I got into a world thats just the normal generator. I called it Adventure Map.
The Seed of the World is: 199823429691528808
And heres the Error:
Changing view distance to 16, from 10
[17:01:39] [Server thread/INFO]: martinamama[local:E:75b4e792] logged in with entity id 55924 at (-3.1151813979439043, 64.06027311411448, 73.3862983984886)
[17:01:39] [Server thread/INFO]: martinamama hat das Spiel betreten
[17:02:02] [Server thread/WARN]: Can't keep up! Did the system time change, or is the server overloaded? Running 23855ms behind, skipping 477 tick(s)
[17:02:17] [Server thread/WARN]: Can't keep up! Did the system time change, or is the server overloaded? Running 14429ms behind, skipping 288 tick(s)
[17:02:23] [Server thread/INFO]: Saving and pausing game...
[17:02:23] [Server thread/INFO]: Saving chunks for level 'Adventure Map'/Overworld
[17:02:32] [Server thread/INFO]: Saving chunks for level 'Adventure Map'/Nether
[17:02:32] [Server thread/INFO]: Saving chunks for level 'Adventure Map'/The End
[17:04:31] [Server thread/ERROR]: Encountered an unexpected exception
java.lang.OutOfMemoryError: Java heap space
[17:04:38] [Server thread/INFO]: Stopping server
[17:04:38] [Server thread/INFO]: Saving players
[17:04:45] [Server thread/ERROR]: Exception stopping the server
java.lang.OutOfMemoryError: Java heap space
Exception in thread "Server thread" java.lang.OutOfMemoryError: Java heap space

When i had a seeing of 10 Chunks its all fine but when i do 16 Chunks a region is blinking with i dont know with Chunks that are changing themself from bedrock to Bioms to... In the screenshot you can see it(I Promise nothing with Photo Shop ). It was lagging very much but i did a Video about it,too .Its rendering now and i will answer my question with the link to my video its in German but i wrote something in English, too.