Error: Could not find or load main class net.minecraft.client.main.Main

I have the same issue. Played it this morning.

Same issue and Error. Worked about twelve hours ago.

same thing here:

Error: Could not find or load main class net.minecraft.client.main.Main
Java HotSpot(TM) 64-Bit Server VM warning: Using incremental CMS is deprecated and will likely be removed in a future release

Game was perfect yesterday.

My Launcher Log is attached and the Game Output is pasted here:

Error: Could not find or load main class net.minecraft.client.main.Main
Java HotSpot(TM) 64-Bit Server VM warning: Using incremental CMS is deprecated and will likely be removed in a future release

Also get this one sometimes:

Exception in thread "main" java.lang.UnsatisfiedLinkError: no lwjgl64 in java.library.path
at java.lang.ClassLoader.loadLibrary(ClassLoader.java:1857)
at java.lang.Runtime.loadLibrary0(Runtime.java:870)
at java.lang.System.loadLibrary(System.java:1119)
at org.lwjgl.Sys$1.run(Sys.java:72)
at java.security.AccessController.doPrivileged(Native Method)
at org.lwjgl.Sys.doLoadLibrary(Sys.java:66)
at org.lwjgl.Sys.loadLibrary(Sys.java:87)
at org.lwjgl.Sys.<clinit>(Sys.java:117)
at bcc.I(SourceFile:2748)
at net.minecraft.client.main.Main.main(SourceFile:39)
Java HotSpot(TM) 64-Bit Server VM warning: Using incremental CMS is deprecated and will likely be removed in a future release

Also having said issue after playing an hour or two ago.

Same issue! Played just last night, now it won't download the new update, instead it defaults me to 1.8.9.

This is mots likely the cause:
[17:50:34 INFO]: Deleting orphaned version 1.9 because it's a snapshot available on remote
[17:50:34 INFO]: Uninstalled CompleteVersion{id='1.9', updatedTime=Thu
Mar 10 12:57:03 EET 2016, releasedTime=Thu Mar 10 12:57:03

Same issue for me and a couple of friends. It won't run in 1.9, just 1.8.9. and we haven't touched any files, just played the unmodded version.

here too. was playing a few minutes ago. Sound bugged out and started playing continuous static. closed the game to reboot it. same error as above exactly.

I was able to fix this, at least for now, by editing my profile and selecting "Use Version: Snapshot 1.9". For some reason it thinks the most recent version isn't 1.9, acting like it's still in snapshot.

Oh right that is fairly weird Michael least you found away to get around it, hopefully the issue itself manages to get resolved.

For what it's worth everything is back to normal now, no more issues on my end.

Yeah i can just boot up Minecraft 1.9 now without any problems.. so it seems to be resolved!

Yea it seems to be ok for me too I loaded normally

Fixed it by enabling the (advanced) java-settings in Edit Profile.