starting minecraft 1.8 just crashes the game

whenever I try to start minecraft all it does is just take me to the game output and says: [10:58:55] [Client thread/INFO]: Setting user: pifase
[10:58:55] [Client thread/INFO]: (Session ID is token:d10fea07d3974bebb615e5612551d9b0:e047d41f17354f4e988fe0276c758929)
Exception in thread "Client thread" com.google.gson.JsonSyntaxException: java.lang.IllegalStateException: Expected BEGIN_ARRAY but was STRING at line 1 column 1
at com.google.gson.Gson.fromJson(Gson.java:815)
at com.google.gson.Gson.fromJson(Gson.java:768)
at sa.b(SourceFile:148)
at sa.<init>(SourceFile:42)
at net.minecraft.server.MinecraftServer.<init>(SourceFile:154)
at cyk.<init>(SourceFile:40)
at bss.<init>(SourceFile:285)
at net.minecraft.client.main.Main.main(SourceFile:124)
Caused by: java.lang.IllegalStateException: Expected BEGIN_ARRAY but was STRING at line 1 column 1
at com.google.gson.stream.JsonReader.beginArray(JsonReader.java:338)
at com.google.gson.internal.bind.CollectionTypeAdapterFactory$Adapter.read(CollectionTypeAdapterFactory.java:79)
at com.google.gson.internal.bind.CollectionTypeAdapterFactory$Adapter.read(CollectionTypeAdapterFactory.java:60)
at com.google.gson.Gson.fromJson(Gson.java:803)
... 7 more
I think I just need to update java