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    Thrown when an application is trying to use or access an object whose reference equals to null but if you are getting no message, try using the option -XX:-OmitStackTraceInFastThrow.

Solutions on the web

via gamepedia.com by Unknown author, 1 year ago
This exception has no message.
via Google Groups by Frank Linden, 8 months ago
This exception has no message.
via Stack Overflow by martin kimani
, 10 months ago
via Oracle Community by 843841, 2 years ago
via Stack Overflow by ThomasJazz
, 7 months ago
via Oracle Community by 807592, 1 year ago
This exception has no message.
java.lang.NullPointerException at java.io.Reader.<init>(Unknown Source) at java.io.InputStreamReader.<init>(Unknown Source) at net.minecraft.server.v1_6_R1.AchievementMap.<init>(SourceFile:15) at net.minecraft.server.v1_6_R1.AchievementMap.<clinit>(SourceFile:9) at net.minecraft.server.v1_6_R1.Statistic.g(SourceFile:37) at net.minecraft.server.v1_6_R1.CounterStatistic.g(SourceFile:15) at net.minecraft.server.v1_6_R1.StatisticList.<clinit>(SourceFile:27) at net.minecraft.server.v1_6_R1.MinecraftServer.main(MinecraftServer.java:611) at org.bukkit.craftbukkit.Main.main(Main.java:152)