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Exception in thread "Thread-4" java.lang.UnsatisfiedLinkError: no lwjgl in java.library.path
    at java.lang.ClassLoader.loadLibrary(Unknown Source)
    at java.lang.Runtime.loadLibrary0(Unknown Source)
    at java.lang.System.loadLibrary(Unknown Source)
    at org.lwjgl.Sys$1.run(Sys.java:73)
    at java.security.AccessController.doPrivileged(Native Method)
    at org.lwjgl.Sys.doLoadLibrary(Sys.java:66)
    at org.lwjgl.Sys.loadLibrary(Sys.java:95)
    at org.lwjgl.Sys.<clinit>(Sys.java:112)
    at org.lwjgl.opengl.Display.<clinit>(Display.java:135)
    at com.mojang.minecraft.Minecraft.run(Minecraft.java:227)
    at java.lang.Thread.run(Unknown Source)

LWJGL is properly installed in my workspace, so I don't understand why this error happens. The 'MinecraftMania - Single Player' window opens, but it only has the system color background (beige or gray on windows) in it.

ca1f6eb
Minecraft.java
Line 874.

When running in eclipse I get this error

java.lang.IllegalArgumentException: input == null!
	at java.desktop/javax.imageio.ImageIO.read(ImageIO.java:1358)
	at com.mojang.minecraft.gui.FontRenderer.<init>(FontRenderer.java:24)
	at com.mojang.minecraft.Minecraft.run(Minecraft.java:307)
	at java.base/java.lang.Thread.run(Thread.java:833)

This is the code in FontRenderer.java that causes the error:

BufferedImage var14;
try {
     var14 = ImageIO.read(TextureManager.class.getResourceAsStream(var2));
} catch (IOException var13) {
     throw new RuntimeException(var13);
}

var2 is a string set to file names like "/default.png", "/default.gif", etc

No idea what's wrong, haven't changed any code relating to this?

You can walk on water, flowers.

The game starts but the display doesn't...

They download but don't work anymore. No idea why...

On old Java versions, ArrayLists behaved differently: index 1 is first element and all elements after are 2,3,4 and etc. But on new Javas ArrayLists, as i said, behave differently. So, when you are dead, an exception triggers in class GameOverScreen. The way to fix is: change ((Button)this.buttons.get(2)).active = false; to ((Button)this.buttons.get(1)).active = false;