Minecraft Forums

Ok, first of all, if you're going to ask me why am I trying to start 1.4.7 when 1.12.2 is out. I'm wanting to load MonkeyFarm's 2nd LP world in a version where almost nothing will be corrupt.

I get a crash before loading up the menu for a reason that doesn't display.

---- Minecraft Crash Report ----
// My bad.

Time: 3/27/18 3:34 PM
Description: Failed to start game

java.lang.NullPointerException
	at java.io.Reader.<init>(Reader.java:78)
	at java.io.InputStreamReader.<init>(InputStreamReader.java:97)
	at bn.a(SourceFile:56)
	at bn.a(SourceFile:91)
	at net.minecraft.client.Minecraft.a(SourceFile:249)
	at asq.a(SourceFile:56)
	at net.minecraft.client.Minecraft.run(SourceFile:515)
	at java.lang.Thread.run(Thread.java:745)


A detailed walkthrough of the error, its code path and all known details is as follows:
---------------------------------------------------------------------------------------

-- System Details --
Details:
	Minecraft Version: 1.4.7
	Operating System: Windows 10 (amd64) version 10.0
	Java Version: 1.8.0_25, Oracle Corporation
	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
	Memory: 28541024 bytes (27 MB) / 67108864 bytes (64 MB) up to 1073741824 bytes (1024 MB)
	JVM Flags: 8 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx1G -XX:+UnlockExperimentalVMOptions -XX:+UseG1GC -XX:G1NewSizePercent=20 -XX:G1ReservePercent=20 -XX:MaxGCPauseMillis=50 -XX:G1HeapRegionSize=16M
	AABB Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
	Suspicious classes: No suspicious classes found.
	IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
	LWJGL: 2.9.0
	OpenGL: Intel(R) HD Graphics 2000 GL version 3.1.0 - Build 9.17.10.4459, Intel
	Is Modded: Very likely; Jar signature invalidated
	Type: Client (map_client.txt)
	Texture Pack: Default
	Profiler Position: N/A (disabled)

And I wasn't using mods, I wasn't using the old launcher.

Use separate game directories for old versions.

but Minecraft beta and alpha versions work just fine

Install Java 7 and point the game to that version

Beta and alpha don't have localization. Should I go even deeper into detail or do you rather actually play the game?

Quote from sharpyHashtag»

but Minecraft beta and alpha versions work just fine

That doesn't matter:

Downgrading is not, was never, and will never be officially supported. You are advised to run older versions in separate directories. Otherwise, issues like this will occur.

When launching Minecraft 1.5.2 or below in a folder that was previously used to start a recent version (e.g. 1.12), the game will crash on start:

java.lang.NullPointerException
at java.io.Reader.<init>(Unknown Source)
at java.io.InputStreamReader.<init>(Unknown Source)
at bp.a(SourceFile:64)
at bp.a(SourceFile:100)
at net.minecraft.client.Minecraft.a(SourceFile:252)
at avv.a(SourceFile:56)
at net.minecraft.client.Minecraft.run(SourceFile:507)
at java.lang.Thread.run(Unknown Source)

https://bugs.mojang.com/browse/MCL-5837

Also, due to MCL-1394 you should instead run newer versions in a separate directory as older versions (also 1.5.2 and earlier) do not properly support non-default directories. You'll need to delete options.txt first though (and even if the game does not crash each time you switch versions you'll have to reset a lot of settings).

In addition, the current launcher does not properly download sounds for older versions; you'll need to use the older launcher so they are downloaded properly, after which you should be able to use the current launcher and they will still work, and if you want a custom skin you'll have to use a resource (or texture) pack to change the default skin (any custom heads will not work either way).

(due to all of these issues you are probably better off using a 3rd party launcher if you frequently use older versions; Mojang takes too long to fix even minor bugs, especially since they do not officially support anything older than 1.12.2 other than to let you still play them - most game/software developers don't even let you get older versions).

I put 1.4.2 and 1.4.7 in their own directories, yet, they're still crashing

Crash Report 2

      Minecraft has crashed!      
      ----------------------      

Minecraft has stopped running because it encountered a problem; Failed to start game
This error has been saved to C:\Users\rober\Documents\MinecraftOld\1.4.2\crash-reports\crash-2018-03-28_16.42.38-client.txt for your convenience. Please include a copy of this file if you report this crash to anyone.



--- BEGIN ERROR REPORT e4371b6d --------
Generated 3/28/18 4:42 PM

- Minecraft Version: 1.4.2
- Operating System: Windows 10 (amd64) version 10.0
- Java Version: 1.8.0_25, Oracle Corporation
- Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
- Memory: 30822408 bytes (29 MB) / 67108864 bytes (64 MB) up to 1073741824 bytes (1024 MB)
- JVM Flags: 8 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx1G -XX:+UnlockExperimentalVMOptions -XX:+UseG1GC -XX:G1NewSizePercent=20 -XX:G1ReservePercent=20 -XX:MaxGCPauseMillis=50 -XX:G1HeapRegionSize=16M
- AABB Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
- LWJGL: 2.9.0
- OpenGL: Intel(R) HD Graphics 2000 GL version 3.1.0 - Build 9.17.10.4459, Intel
- Is Modded: Very likely
- Type: Client
- Texture Pack: Default
- Profiler Position: N/A (disabled)
- Vec3 Pool Size: ~ERROR~ NullPointerException: null

java.lang.NullPointerException
	at java.io.Reader.<init>(Reader.java:78)
	at java.io.InputStreamReader.<init>(InputStreamReader.java:97)
	at be.a(SourceFile:56)
	at be.a(SourceFile:91)
	at net.minecraft.client.Minecraft.a(SourceFile:249)
	at net.minecraft.client.Minecraft.run(SourceFile:515)
	at java.lang.Thread.run(Thread.java:745)
--- END ERROR REPORT cbe7c279 ----------

As I mentioned, you need to use the default directory - and delete options.txt from it - for 1.4.7 and instead use a different directory for newer versions:

MCL-1394 Trouble with multiple custom directories

Christie N added a comment - 22/Jan/14 5:34 PM
Yes, any version below 1.6 ignores custom directories. Note that Beta 1.7.3 used to work, but doesn't now in Launcher 1.3.8.

you could also just play the newer version. Why do you wanna play 1.4.x tho?