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Error with custom creative tab sorting


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So, before anyone says anything, yes, I followed this tutorial:

However, when I set up the tabSorter, looking like this:

tabSorter = Ordering.explicit(order).onResultOf(new Function<ItemStack, Item>() {

I get this error:

The method onResultOf(Function<F,? extends Item>) in the type Ordering<Item> is not applicable for the arguments (new Function<ItemStack,Item>(){})

And I can't figure out why.  I followed the tutorial exactly.  I'm in Eclipse, and I think I have Java 1.6 as my compatibility and runtime environment, but I tried 1.7 and 1.8 and there wasn't a difference.  Any ideas?

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The Ordering class is from the Guava library, which uses its own functional interfaces (that predate Java 8). Make sure you've imported com.google.common.base.Function (Guava) rather than java.util.function.Function (Java 8).

Please don't PM me to ask for help. Asking your question in a public thread preserves it for people who are having the same problem in the future.

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