jre7error

Error present when using jre7 but not present with jre6:
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java.lang.ExceptionInInitializerError
        at net.minecraft.server.v1_7_R1.PotionBrewer.<clinit>(SourceFile:82)
        at net.minecraft.server.v1_7_R1.Item.l(Item.java:75)
        at net.minecraft.server.v1_7_R1.DispenserRegistry.b(SourceFile:358)
        at net.minecraft.server.v1_7_R1.MinecraftServer.main(MinecraftServer.java:676)
        at org.bukkit.craftbukkit.Main.main(Main.java:159)
Caused by: java.lang.ArrayIndexOutOfBoundsException: 21
        at org.bukkit.potion.PotionEffectType.registerPotionEffectType(PotionEffectType.java:221)
        at net.minecraft.server.v1_7_R1.MobEffectList.<init>(MobEffectList.java:71)
        at net.minecraft.server.v1_7_R1.MobEffectHealthBoost.<init>(SourceFile:8)
        at net.minecraft.server.v1_7_R1.MobEffectList.<clinit>(MobEffectList.java:39)
        ... 5 more
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